General Electric Co
General ElActive Patents
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Total Holdings
2275
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| EP0635238A1 | Tumor tissue characterization apparatus and method | Expired / Lapsed | 1994-07-14 | — | 19 | Details |
| GB2149510A | Patient alignment system for nmr studies | Expired / Lapsed | 1984-09-17 | — | 13 | Details |
| DE2903982A1 | PROCESS FOR DESULFURIZING COAL | Expired / Lapsed | 1979-02-02 | — | 0 | Details |
| GB2011075A | Ultrasonic imaging systems | Expired / Lapsed | 1978-12-20 | — | 0 | Details |
| DE2624692A1 | MAGNETO-OPTICAL CONVERTER | Expired / Lapsed | 1976-06-02 | — | 0 | Details |
| GB1080658A | Improvements in or relating to battery chargers | Expired / Lapsed | 1966-05-04 | — | 0 | Details |
| GB945249A | Improvements in semiconductor devices | Expired / Lapsed | 1960-09-06 | — | 0 | Details |
| GB854564A | Improvements in coil structure for electrical apparatus | Expired / Lapsed | 1959-01-13 | — | 0 | Details |
| GB830644A | Improvements in electrical insulation material | Expired / Lapsed | 1958-07-18 | — | 0 | Details |
| GB738216A | Improvements in and relating to broad area transistors | Expired / Lapsed | 1953-06-15 | — | 0 | Details |
| GB190657A | Improvements in and relating to pyrometers | Expired / Lapsed | 1922-01-27 | — | 0 | Details |
| US6994727B2 | Total disc implant | Expired / Lapsed | 2003-12-15 | 2006-02-07 | 27 | Details |
| US6438403B1 | Method and apparatus for cardiac analysis using four-dimens… | Expired / Lapsed | 1999-11-01 | 2002-08-20 | 15 | Details |
| US6275560B1 | Cardiac gated computed tomography system | Expired / Lapsed | 1998-12-22 | 2001-08-14 | 18 | Details |
| US6058218A | Enhanced visualization of weak image sources in the vicinit… | Expired / Lapsed | 1997-11-10 | 2000-05-02 | 14 | Details |
| US5954649A | Catheter system having ultrasound locating capabilities | Expired / Lapsed | 1997-10-20 | 1999-09-21 | 18 | Details |
| US5792162A | Guarded surgical scalpel with scalpel blade remover | Expired / Lapsed | 1996-05-08 | 1998-08-11 | 12 | Details |
| US5590429A | Electrophysiology table | Expired / Lapsed | 1995-09-13 | 1997-01-07 | 12 | Details |
| US5568931A | Brush seal | Expired / Lapsed | 1992-08-20 | 1996-10-29 | 4 | Details |
| US5517537A | Integrated acoustic leak detection beamforming system | Expired / Lapsed | 1994-08-18 | 1996-05-14 | 23 | Details |
| US5482046A | Acoustic power control technique | Expired / Lapsed | 1994-11-23 | 1996-01-09 | 10 | Details |
| US5458120A | Ultrasonic transducer with magnetostrictive lens for dynami… | Expired / Lapsed | 1993-12-08 | 1995-10-17 | 27 | Details |
| US5433199A | Cardiac functional analysis method using gradient image seg… | Expired / Lapsed | 1994-02-24 | 1995-07-18 | 5 | Details |
| US5318025A | Tracking system to monitor the position and orientation of … | Expired / Lapsed | 1992-04-01 | 1994-06-07 | 19 | Details |
| US5298026A | Method and apparatus for laser medical treatment | Expired / Lapsed | 1992-07-23 | 1994-03-29 | 23 | Details |
| US5290266A | Flexible coating for magnetic resonance imaging compatible … | Expired / Lapsed | 1992-08-14 | 1994-03-01 | 18 | Details |
| US5235970A | Tracheal intubation with a stylet guide | Expired / Lapsed | 1992-06-23 | 1993-08-17 | 15 | Details |
| US5228443A | Method for estimation and display of current source distrib… | Expired / Lapsed | 1992-03-27 | 1993-07-20 | 4 | Details |
| US5226847A | Apparatus and method for acquiring imaging signals with red… | Expired / Lapsed | 1992-01-31 | 1993-07-13 | 30 | Details |
| US5211165A | Tracking system to follow the position and orientation of a… | Expired / Lapsed | 1991-09-03 | 1993-05-18 | 22 | Details |
| US5199948A | Needleless valve | Expired / Lapsed | 1991-05-02 | 1993-04-06 | 31 | Details |
| US5186177A | Method and apparatus for applying synthetic aperture focusi… | Expired / Lapsed | 1991-12-05 | 1993-02-16 | 16 | Details |
| US5132539A | Planar X-ray imager having a moisture-resistant sealing str… | Expired / Lapsed | 1991-08-29 | 1992-07-21 | 25 | Details |
| US5121364A | Time frequency control filter for an ultrasonic imaging sys… | Expired / Lapsed | 1991-08-07 | 1992-06-09 | 12 | Details |
| US4947121A | Apparatus and method for enhanced multiple coil nuclear mag… | Expired / Lapsed | 1989-12-05 | 1990-08-07 | 3 | Details |
| US4937775A | Apparatus for the cross-correlation of a pair of complex sa… | Expired / Lapsed | 1988-11-21 | 1990-06-26 | 7 | Details |
| US4839652A | Method and apparatus for high speed digital phased array co… | Expired / Lapsed | 1987-06-01 | 1989-06-13 | 18 | Details |
| US4793679A | Optical coupling system | Expired / Lapsed | 1987-04-20 | 1988-12-27 | 13 | Details |
| US4742829A | Intracavitary ultrasound and biopsy probe for transvaginal … | Expired / Lapsed | 1986-08-11 | 1988-05-10 | 6 | Details |
| US4737716A | Self-shielded gradient coils for nuclear magnetic resonance… | Expired / Lapsed | 1986-02-06 | 1988-04-12 | 20 | Details |
| US4716297A | Method and apparatus for optically switching current | Expired / Lapsed | 1985-06-10 | 1987-12-29 | 20 | Details |
| US4646045A | Aperture sized disc shaped end caps of a ferromagnetic shie… | Expired / Lapsed | 1985-03-25 | 1987-02-24 | 10 | Details |
| US4646046A | Shielded room construction for containment of fringe magnet… | Expired / Lapsed | 1984-11-21 | 1987-02-24 | 28 | Details |
| US4574451A | Method for producing an article with a fluid passage | Expired / Lapsed | 1982-12-22 | 1986-03-11 | 13 | Details |
| US4570173A | High-aspect-ratio hollow diffused regions in a semiconducto… | Expired / Lapsed | 1983-10-24 | 1986-02-11 | 7 | Details |
| US4550608A | Oscillating scanner and drive mechanism therefor | Expired / Lapsed | 1983-12-29 | 1985-11-05 | 12 | Details |
| US4546658A | Piezoelectric force/pressure sensor | Expired / Lapsed | 1984-02-24 | 1985-10-15 | 21 | Details |
| US4528652A | Ultrasonic transducer and attenuating material for use ther… | Expired / Lapsed | 1981-12-30 | 1985-07-09 | 10 | Details |
| US4525858A | Method and apparatus for reconstruction of three-dimensiona… | Expired / Lapsed | 1983-01-03 | 1985-06-25 | 26 | Details |
| US4509030A | Correction coil assembly for NMR magnets | Expired / Lapsed | 1984-07-05 | 1985-04-02 | 14 | Details |
| US4456020A | Adjustable hair curler | Expired / Lapsed | 1983-12-19 | 1984-06-26 | 8 | Details |
| US4449195A | Digital fluorographic processor control | Expired / Lapsed | 1981-11-13 | 1984-05-15 | 5 | Details |
| US4441503A | Collimation of ultrasonic linear array transducer | Expired / Lapsed | 1982-01-18 | 1984-04-10 | 7 | Details |
| US4432031A | Method for overcurrent protection | Expired / Lapsed | 1982-05-03 | 1984-02-14 | 9 | Details |
| US4425525A | Ultrasonic transducer array shading | Expired / Lapsed | 1982-02-16 | 1984-01-10 | 8 | Details |
| US4414540A | Automatic redundant transducer selector for a steam turbine… | Expired / Lapsed | 1981-07-06 | 1983-11-08 | 14 | Details |
| US4402012A | Two-dimensional digital linear interpolation system | Expired / Lapsed | 1981-11-16 | 1983-08-30 | 13 | Details |
| US4393402A | Subtraction fluoroscopy method and apparatus | Expired / Lapsed | 1981-06-08 | 1983-07-12 | 13 | Details |
| US4385397A | Parallax corrected external alignment lights | Expired / Lapsed | 1981-10-23 | 1983-05-24 | 10 | Details |
| US4382215A | System and method of precision machining | Expired / Lapsed | 1981-07-16 | 1983-05-03 | 16 | Details |
| US4382201A | Ultrasonic transducer and process to obtain high acoustic a… | Expired / Lapsed | 1981-04-27 | 1983-05-03 | 6 | Details |
| US4367490A | Noise reduction in digital fluoroscopy systems | Expired / Lapsed | 1981-04-24 | 1983-01-04 | 12 | Details |
| US4359908A | Electrical bushing gas sampling apparatus and method | Expired / Lapsed | 1980-12-29 | 1982-11-23 | 13 | Details |
| US4356731A | Method and means for generating time gain compensation cont… | Expired / Lapsed | 1980-11-03 | 1982-11-02 | 13 | Details |
| US4300550A | Suction and oxygenation catheter | Expired / Lapsed | 1980-03-07 | 1981-11-17 | 7 | Details |
| US4290052A | Capacitive touch entry apparatus having high degree of pers… | Expired / Lapsed | 1979-10-26 | 1981-09-15 | 9 | Details |
| US4257278A | Quantitative volume blood flow measurement by an ultrasound… | Expired / Lapsed | 1979-08-24 | 1981-03-24 | 7 | Details |
| US4219221A | Coupling for rejoining sealed tubing | Expired / Lapsed | 1979-02-26 | 1980-08-26 | 12 | Details |
| US4211949A | Wear plate for piezoelectric ultrasonic transducer arrays | Expired / Lapsed | 1978-11-08 | 1980-07-08 | 3 | Details |
| US4212057A | Shared memory multi-microprocessor computer system | Expired / Lapsed | 1976-04-22 | 1980-07-08 | 11 | Details |
| US4198465A | Photocurable acrylic coated polycarbonate articles | Expired / Lapsed | 1978-11-01 | 1980-04-15 | 35 | Details |
| US4180790A | Dynamic array aperture and focus control for ultrasonic ima… | Expired / Lapsed | 1977-12-27 | 1979-12-25 | 9 | Details |
| US4180612A | Hydantoin-polyester coating compositions | Expired / Lapsed | 1975-01-13 | 1979-12-25 | 18 | Details |
| US4173754A | Distributed control system | Expired / Lapsed | 1977-06-24 | 1979-11-06 | 11 | Details |
| US4169990A | Electronically commutated motor | Expired / Lapsed | 1977-06-01 | 1979-10-02 | 58 | Details |
| US4167786A | Load control processor | Expired / Lapsed | 1978-01-24 | 1979-09-11 | 12 | Details |
| US4159462A | Ultrasonic multi-sector scanner | Expired / Lapsed | 1977-08-18 | 1979-06-26 | 20 | Details |
| US4156194A | Frequency-shift-keyed receiver | Expired / Lapsed | 1977-09-06 | 1979-05-22 | 16 | Details |
| US4138105A | Respiratory exerciser | Expired / Lapsed | 1977-02-28 | 1979-02-06 | 12 | Details |
| US4100883A | Apparatus for electrostatic deposition on a running conduct… | Expired / Lapsed | 1976-10-18 | 1978-07-18 | 7 | Details |
| US4093997A | Portable programmer for time-of-day metering register syste… | Expired / Lapsed | 1976-09-17 | 1978-06-06 | 18 | Details |
| US4081215A | Stable two-channel, single-filter spectrometer | Expired / Lapsed | 1976-05-18 | 1978-03-28 | 23 | Details |
| US4079417A | Digital video window control | Expired / Lapsed | 1976-07-06 | 1978-03-14 | 13 | Details |
| US4054835A | Rapid response generating voltmeter | Expired / Lapsed | 1976-11-22 | 1977-10-18 | 16 | Details |
| US4041300A | Photoflash array with discharge path for electrostatic char… | Expired / Lapsed | 1975-10-28 | 1977-08-09 | 10 | Details |
| US4035621A | Excavator data logging system | Expired / Lapsed | 1975-07-14 | 1977-07-12 | 6 | Details |
| US4025070A | Respiratory exerciser | Expired / Lapsed | 1976-04-19 | 1977-05-24 | 12 | Details |
| US4020358A | Device system and method for controlling the supply of powe… | Expired / Lapsed | 1975-12-16 | 1977-04-26 | 47 | Details |
| US4017985A | Multisensor digital image generator | Expired / Lapsed | 1975-08-22 | 1977-04-19 | 6 | Details |
| US4011017A | Borescope support apparatus | Expired / Lapsed | 1975-07-16 | 1977-03-08 | 6 | Details |
| US4002827A | Polar coordinate format to a cartesian coordinate format sc… | Expired / Lapsed | 1975-05-15 | 1977-01-11 | 6 | Details |
| US3996091A | Method and apparatus for heat bonding | Expired / Lapsed | 1974-09-11 | 1976-12-07 | 4 | Details |
| US3975720A | Food thermometer for microwave oven | Expired / Lapsed | 1975-09-23 | 1976-08-17 | 15 | Details |
| US3959767A | Data transmission system | Expired / Lapsed | 1974-08-21 | 1976-05-25 | 14 | Details |
| US3957704A | Cross-linking agents for room temperature vulcanizable sili… | Expired / Lapsed | 1974-12-19 | 1976-05-18 | 25 | Details |
| US3950677A | Housing mounting arrangement for ground fault circuit inter… | Expired / Lapsed | 1974-10-30 | 1976-04-13 | 8 | Details |
| US3944723A | Station for power line access data system | Expired / Lapsed | 1974-12-05 | 1976-03-16 | 14 | Details |
| US3930193A | SCR inverter systems | Expired / Lapsed | 1973-08-02 | 1975-12-30 | 16 | Details |
| US3925277A | Process for packaging and mixing a two-part room temperatur… | Expired / Lapsed | 1974-05-06 | 1975-12-09 | 2 | Details |
| US3923056A | Compliance compensation for electronically controlled volum… | Expired / Lapsed | 1974-06-19 | 1975-12-02 | 4 | Details |
| US3921005A | Emergency lighting system with high efficiency inverter | Expired / Lapsed | 1974-12-19 | 1975-11-18 | 28 | Details |
| US3920951A | Laser etching apparatus for forming photographic images on … | Expired / Lapsed | 1974-06-03 | 1975-11-18 | 8 | Details |
| US3918269A | Temperature and air flow controlling apparatus of a househo… | Expired / Lapsed | 1974-10-16 | 1975-11-11 | 4 | Details |
| US3917432A | Borescope support apparatus | Expired / Lapsed | 1974-11-13 | 1975-11-04 | 4 | Details |
| US3907504A | Blood oxygenation system including automatic means for stab… | Expired / Lapsed | 1973-04-06 | 1975-09-23 | 8 | Details |
| US3906120A | Method for preparing slides for blood evaluation | Expired / Lapsed | 1973-05-24 | 1975-09-16 | 15 | Details |
| US3899776A | Programmable terminal | Expired / Lapsed | 1974-02-28 | 1975-08-12 | 14 | Details |
| US3867681A | Battery charging circuit | Expired / Lapsed | 1974-03-20 | 1975-02-18 | 6 | Details |
| US3865766A | Process for bodying organopolysiloxanes | Expired / Lapsed | 1973-12-14 | 1975-02-11 | 48 | Details |
| US3865785A | Polyesteramideimides | Expired / Lapsed | 1972-12-27 | 1975-02-11 | 4 | Details |
| US3863224A | Selectively controllable shift register and counter divider… | Expired / Lapsed | 1973-01-30 | 1975-01-28 | 14 | Details |
| US3859997A | Reservoir bag for anesthesiology | Expired / Lapsed | 1973-07-09 | 1975-01-14 | 3 | Details |
| US3853817A | Tin containing esterimide polymer resins and method of form… | Expired / Lapsed | 1973-06-08 | 1974-12-10 | 13 | Details |
| US3853496A | Method of making a metal insulator silicon field effect tra… | Expired / Lapsed | 1973-01-02 | 1974-12-10 | 7 | Details |
| US3821630A | Commutation failure detection and control for scr inverters | Expired / Lapsed | 1973-08-02 | 1974-06-28 | 11 | Details |
| US3821686A | Protective connector devices | Expired / Lapsed | 1971-10-21 | 1974-06-28 | 12 | Details |
| US3819954A | Signal level shift compensation in chargetransfer delay lin… | Expired / Lapsed | 1973-02-01 | 1974-06-25 | 28 | Details |
| US3810814A | Asymmetric polymer membranes of reduced elastic modulus | Expired / Lapsed | 1972-12-18 | 1974-05-14 | 0 | Details |
| US3793531A | Electronic tree light controller | Expired / Lapsed | 1971-12-09 | 1974-02-19 | 7 | Details |
| US3793060A | Metallized ultrafine porous polymer articles | Expired / Lapsed | 1971-06-03 | 1974-02-19 | 8 | Details |
| US3790778A | Dynamic biasing arrangement for speed regulation | Expired / Lapsed | 1972-12-13 | 1974-02-05 | 8 | Details |
| US3789268A | Miniature circuit breaker with electronic tripping means | Expired / Lapsed | 1972-12-29 | 1974-01-29 | 16 | Details |
| US3787382A | Photopolymerization of tetrafluoro-ethylene and polymer and… | Expired / Lapsed | 1972-02-16 | 1974-01-22 | 0 | Details |
| US3786220A | Induction cooking appliance including temperature sensing o… | Expired / Lapsed | 1971-12-29 | 1974-01-15 | 4 | Details |
| US3778170A | Borescope guide tube | Expired / Lapsed | 1972-11-02 | 1973-12-11 | 12 | Details |
| US3778757A | Method and apparatus for visual imaging ultrasonic echo sig… | Expired / Lapsed | 1972-09-01 | 1973-12-11 | 42 | Details |
| US3766973A | Control circuit for heating and cooling apparatus | Expired / Lapsed | 1972-03-15 | 1973-10-23 | 8 | Details |
| US3768014A | Cardiac pacemaker rate/interval computer system | Expired / Lapsed | 1972-01-28 | 1973-10-23 | 8 | Details |
| US3767308A | Method and apparatus for sensing surface displacement ortho… | Expired / Lapsed | 1972-01-12 | 1973-10-23 | 12 | Details |
| US3763081A | Curable aliphatically unsaturated siloxane and imide blends | Expired / Lapsed | 1972-01-17 | 1973-10-02 | 0 | Details |
| US3739369A | Historical data display | Expired / Lapsed | 1971-01-04 | 1973-06-12 | 8 | Details |
| US3737212A | Diffraction optics head up display | Expired / Lapsed | 1970-12-14 | 1973-06-05 | 17 | Details |
| US3735766A | Optional unipolar-bipolar body organ stimulator | Expired / Lapsed | 1971-04-19 | 1973-05-29 | 18 | Details |
| US3723005A | Wide angle sighting apparatus | Expired / Lapsed | 1965-12-13 | 1973-03-27 | 14 | Details |
| US3720046A | Flow distribution apparatus | Expired / Lapsed | 1969-06-05 | 1973-03-13 | 0 | Details |
| US3701003A | Current transformers with improved coaxial feed | Expired / Lapsed | 1970-12-14 | 1972-10-24 | 10 | Details |
| US3699544A | Three transistor memory cell | Expired / Lapsed | 1971-05-26 | 1972-10-17 | 10 | Details |
| US3699341A | Muzzle flash detector | Expired / Lapsed | 1968-09-23 | 1972-10-17 | 14 | Details |
| US3697917A | Semiconductor strain gage pressure transducer | Expired / Lapsed | 1971-08-02 | 1972-10-10 | 8 | Details |
| US3687365A | Thermostatic flow controller | Expired / Lapsed | 1970-09-10 | 1972-08-29 | 6 | Details |
| US3686355A | Shaped composition of polymer and surface modifying block c… | Expired / Lapsed | 1970-05-08 | 1972-08-22 | 3 | Details |
| US3680002A | Microstrip microwave oscillators | Expired / Lapsed | 1970-10-19 | 1972-07-25 | 17 | Details |
| US3678736A | Machine with improved operating head traversing workpieces … | Expired / Lapsed | 1970-08-03 | 1972-07-25 | 11 | Details |
| US3678352A | Compatible permanent magnet or reluctance brushless motors … | Expired / Lapsed | 1970-11-06 | 1972-07-18 | 18 | Details |
| US3677800A | Anti-thrombogenic coatings and products | Expired / Lapsed | 1970-03-18 | 1972-07-18 | 0 | Details |
| US3670403A | Three masking step process for fabricating insulated gate f… | Expired / Lapsed | 1970-03-19 | 1972-06-20 | 3 | Details |
| US3666526A | Refractory porous bodies | Expired / Lapsed | 1966-01-06 | 1972-05-30 | 0 | Details |
| US3665168A | Adaptively controlled position prediction system | Expired / Lapsed | 1970-12-18 | 1972-05-23 | 8 | Details |
| US3662356A | Integrated circuit bistable memory cell using charge-pumped… | Expired / Lapsed | 1970-08-28 | 1972-05-09 | 14 | Details |
| US3662163A | Digital signal linearizer | Expired / Lapsed | 1970-08-04 | 1972-05-09 | 8 | Details |
| US3657503A | Terminal enclosure | Expired / Lapsed | 1970-08-27 | 1972-04-18 | 5 | Details |
| US3657525A | Direct feed rate control circuit | Expired / Lapsed | 1970-03-17 | 1972-04-18 | 12 | Details |
| US3657404A | Method and apparatus for cleaving anisotropic pyrolytically… | Expired / Lapsed | 1969-05-28 | 1972-04-18 | 0 | Details |
| US3653180A | Block copolymer membrane for separating polar contaminants … | Expired / Lapsed | 1970-11-02 | 1972-04-04 | 13 | Details |
| US3652716A | Imido-substituted polyester compositions | Expired / Lapsed | 1969-07-01 | 1972-03-28 | 0 | Details |
| US3650846A | Process for reconstituting the grain structure of metal sur… | Expired / Lapsed | 1968-11-04 | 1972-03-21 | 8 | Details |
| US3646665A | Complementary mis-fet devices and method of fabrication | Expired / Lapsed | 1970-05-22 | 1972-03-07 | 14 | Details |
| US3646399A | Printed circuit board construction | Expired / Lapsed | 1970-03-04 | 1972-02-29 | 8 | Details |
| US3640943A | Polymer-filler composition | Expired / Lapsed | 1969-07-07 | 1972-02-08 | 0 | Details |
| US3639699A | Magnetic transducer having a composite magnetic core struct… | Expired / Lapsed | 1970-02-27 | 1972-02-01 | 10 | Details |
| US3636330A | Autonomous space navigation system utilizing holographic re… | Expired / Lapsed | 1967-03-14 | 1972-01-18 | 23 | Details |
| US3625745A | Antithrombogenic article and process | Expired / Lapsed | 1970-03-18 | 1971-12-07 | 12 | Details |
| US3626135A | Electronic oven with ferrite rf rejection filters | Expired / Lapsed | 1969-11-19 | 1971-12-07 | 10 | Details |
| US3624603A | Digital data communications system with means for improving… | Expired / Lapsed | 1969-09-16 | 1971-11-30 | 25 | Details |
| US3623003A | Subscriber-response unit | Expired / Lapsed | 1970-03-03 | 1971-11-23 | 14 | Details |
| US3622882A | Reactance circuit tester | Expired / Lapsed | 1969-06-11 | 1971-11-23 | 4 | Details |
| US3623026A | Mis device and method for storing information and providing… | Expired / Lapsed | 1969-01-21 | 1971-11-23 | 22 | Details |
| US3621469A | Voltage controlled oscillator | Expired / Lapsed | 1969-08-21 | 1971-11-16 | 11 | Details |
| US3618048A | Random access large-capacity memories | Expired / Lapsed | 1968-07-25 | 1971-11-02 | 23 | Details |
| US3614855A | Continuous production of calibration gas flows | Expired / Lapsed | 1967-12-26 | 1971-10-26 | 0 | Details |
| US3609306A | Sequential code reader | Expired / Lapsed | 1969-12-08 | 1971-09-28 | 33 | Details |
| US3609379A | Photoelectric drop sensing and timing control for intraveno… | Expired / Lapsed | 1969-05-13 | 1971-09-28 | 15 | Details |
| US3609698A | Control station for two-way address communication network | Expired / Lapsed | 1968-11-27 | 1971-09-28 | 9 | Details |
| US3604804A | Noncontacting motion sensor | Expired / Lapsed | 1968-12-27 | 1971-09-14 | 9 | Details |
| US3598984A | Photoflash lamp array | Expired / Lapsed | 1968-12-16 | 1971-08-10 | 11 | Details |
| US3582756A | Polyphase power converter circuits having a high frequency … | Expired / Lapsed | 1970-02-12 | 1971-06-01 | 21 | Details |
| US3573432A | System for reading coded information from punched cards wit… | Expired / Lapsed | 1967-04-10 | 1971-04-06 | 13 | Details |
| US3572109A | Integral semiconductor strain gage transducers with frequen… | Expired / Lapsed | 1968-08-09 | 1971-03-23 | 0 | Details |
| US3569940A | Remote alarm for visual display terminals | Expired / Lapsed | 1968-06-10 | 1971-03-09 | 22 | Details |
| US3563247A | Bidirectional heart stimulator | Expired / Lapsed | 1968-03-14 | 1971-02-16 | 3 | Details |
| US3562717A | System protection apparatus | Expired / Lapsed | 1968-02-23 | 1971-02-09 | 0 | Details |
| US3559187A | Input/output controller with linked data control words | Expired / Lapsed | 1968-11-13 | 1971-01-26 | 0 | Details |
| US3559177A | Variable length,diverse format digital information transfer… | Expired / Lapsed | 1968-09-03 | 1971-01-26 | 0 | Details |
| US3554646A | Optical distance gage | Expired / Lapsed | 1969-01-28 | 1971-01-12 | 0 | Details |
| US3554809A | Process and apparatus for distributing fluid inerts with re… | Expired / Lapsed | 1967-12-18 | 1971-01-12 | 0 | Details |
| US3553656A | Selector for the dynamic assignment of priority on a period… | Expired / Lapsed | 1969-06-03 | 1971-01-05 | 0 | Details |
| US3551663A | Multiplication apparatus in a data processing system with a… | Expired / Lapsed | 1965-04-15 | 1970-12-29 | 0 | Details |
| US3548806A | Mass emotional reaction measurement system | Expired / Lapsed | 1968-06-26 | 1970-12-22 | 0 | Details |
| US3549971A | Reversing controller | Expired / Lapsed | 1968-05-09 | 1970-12-22 | 0 | Details |
| US3550084A | System and method for identifying a set of graphic characte… | Expired / Lapsed | 1966-06-27 | 1970-12-22 | 0 | Details |
| US3546435A | Pure solid state self-cleaning oven control | Expired / Lapsed | 1969-07-25 | 1970-12-08 | 0 | Details |
| US3542543A | Nickel base brazing alloy | Expired / Lapsed | 1969-01-02 | 1970-11-24 | 0 | Details |
| US3543244A | Information handling system | Expired / Lapsed | 1968-01-04 | 1970-11-24 | 0 | Details |
| US3541676A | Method of forming field-effect transistors utilizing doped … | Expired / Lapsed | 1967-12-18 | 1970-11-24 | 0 | Details |
| US3541257A | Communication response unit | Expired / Lapsed | 1968-11-27 | 1970-11-17 | 0 | Details |
| US3541320A | Drift compensation for integrating amplifiers | Expired / Lapsed | 1968-08-07 | 1970-11-17 | 0 | Details |
| US3540797A | High resolution projection system utilizing an output light… | Expired / Lapsed | 1968-03-07 | 1970-11-17 | 0 | Details |
| US3541513A | Communications control apparatus for sequencing digital dat… | Expired / Lapsed | 1967-09-01 | 1970-11-17 | 0 | Details |
| US3541517A | Apparatus providing inter-processor communication and progr… | Expired / Lapsed | 1966-05-19 | 1970-11-17 | 0 | Details |
| US3539989A | Symbol reading system | Expired / Lapsed | 1966-05-31 | 1970-11-10 | 0 | Details |
| US3537319A | Silicon diaphragm with optimized integral strain gages | Expired / Lapsed | 1968-07-26 | 1970-11-03 | 0 | Details |
| US3536877A | Wafer construction for a switch tuner | Expired / Lapsed | 1968-03-14 | 1970-10-27 | 0 | Details |
| US3535503A | Multiplier-divider computing circuit | Expired / Lapsed | 1968-09-12 | 1970-10-20 | 0 | Details |
| US3531627A | Transit ticket having fare coding means for automatic fare … | Expired / Lapsed | 1965-05-06 | 1970-09-29 | 0 | Details |
| US3529961A | Formation of thin films of gold,nickel or copper by photoly… | Expired / Lapsed | 1966-12-27 | 1970-09-22 | 0 | Details |
| US3525080A | Data storage control apparatus for a multiprogrammed data p… | Expired / Lapsed | 1968-02-27 | 1970-08-18 | 0 | Details |
| US3524997A | Monolithic integrated phase control circuits | Expired / Lapsed | 1967-09-08 | 1970-08-18 | 0 | Details |
| US3524447A | Method of making a rigid tipped polyvinyl catheter | Expired / Lapsed | 1964-04-06 | 1970-08-18 | 0 | Details |
| US3522522A | Dual charging of a capacitor to produce a constant a.c. vol… | Expired / Lapsed | 1968-02-15 | 1970-08-04 | 0 | Details |
| US3521235A | Pattern recognition system | Expired / Lapsed | 1965-07-08 | 1970-07-21 | 0 | Details |
| US3512136A | Input/output control apparatus in a computer system | Expired / Lapsed | 1967-06-21 | 1970-05-12 | 0 | Details |
| US3510850A | Drive circuitry for negative resistance device matrix | Expired / Lapsed | 1968-04-30 | 1970-05-05 | 0 | Details |
| US3509883A | Expanding cannula | Expired / Lapsed | 1967-11-29 | 1970-05-05 | 0 | Details |
| US3510844A | Interprocessing multicomputer systems | Expired / Lapsed | 1966-07-27 | 1970-05-05 | 0 | Details |
| US3505651A | Data storage access control apparatus for a multicomputer s… | Expired / Lapsed | 1967-02-28 | 1970-04-07 | 0 | Details |
| US3505647A | Apparatus providing alterable symbolic memory addressing in… | Expired / Lapsed | 1966-04-18 | 1970-04-07 | 0 | Details |
| US3503850A | Blood oxygenator | Expired / Lapsed | 1967-11-29 | 1970-03-31 | 0 | Details |
| US3504302A | Frequency controlled semiconductor junction laser | Expired / Lapsed | 1964-09-24 | 1970-03-31 | 0 | Details |
| US3503061A | Telemetering system with optoelectronic coupling between tr… | Expired / Lapsed | 1966-07-20 | 1970-03-24 | 0 | Details |
| US3500190A | Vehicle velocity measuring system employing adjustable widt… | Expired / Lapsed | 1967-06-23 | 1970-03-10 | 0 | Details |
| US3500329A | Data processing system | Expired / Lapsed | 1966-10-06 | 1970-03-10 | 0 | Details |
| US3500333A | Data processing unit for providing memory storage of commun… | Expired / Lapsed | 1964-05-04 | 1970-03-10 | 0 | Details |
| US3492588A | Median selector for redundant analog signals | Expired / Lapsed | 1965-02-24 | 1970-01-27 | 0 | Details |
| US3487373A | Apparatus providing symbolic memory addressing in a multico… | Expired / Lapsed | 1965-11-16 | 1969-12-30 | 0 | Details |
| US3483359A | Temperature control circuit | Expired / Lapsed | 1967-12-29 | 1969-12-09 | 0 | Details |
| US3483525A | Intercommunicating multiple data processing system | Expired / Lapsed | 1966-06-06 | 1969-12-09 | 0 | Details |
| US3483522A | Priority apparatus in a computer system | Expired / Lapsed | 1966-05-26 | 1969-12-09 | 0 | Details |
| US3483521A | Program request storage and control apparatus in a multipro… | Expired / Lapsed | 1966-05-13 | 1969-12-09 | 0 | Details |
| US3482265A | Data processing system including means for awarding priorit… | Expired / Lapsed | 1966-07-22 | 1969-12-02 | 0 | Details |
| US3479649A | Data processing system including means for masking program … | Expired / Lapsed | 1966-07-22 | 1969-11-18 | 0 | Details |
| US3478280A | Pulse width modulated laser | Expired / Lapsed | 1966-10-14 | 1969-11-11 | 0 | Details |
| US3476993A | Five layer and junction bridging terminal switching device | Expired / Lapsed | 1959-09-08 | 1969-11-04 | 0 | Details |
| US3475729A | Input/output control apparatus in a computer system | Expired / Lapsed | 1966-05-27 | 1969-10-28 | 0 | Details |
| US3472234A | Body organ electrode | Expired / Lapsed | 1967-08-15 | 1969-10-14 | 0 | Details |
| US3473159A | Data processing system including means for protecting prede… | Expired / Lapsed | 1966-07-07 | 1969-10-14 | 0 | Details |
| US3473155A | Apparatus providing access to storage device on priority-al… | Expired / Lapsed | 1964-05-04 | 1969-10-14 | 0 | Details |
| US3467891A | Combination electrical,mechanical,and thermal connector ass… | Expired / Lapsed | 1967-10-03 | 1969-09-16 | 0 | Details |
| US3466166A | Method for making a hollow metal article | Expired / Lapsed | 1967-01-03 | 1969-09-09 | 0 | Details |
| US3462605A | Semiconductor light-emitter and combination light-emitter-p… | Expired / Lapsed | 1965-09-22 | 1969-08-19 | 0 | Details |
| US3460816A | Fluxless aluminum brazing furnace | Expired / Lapsed | 1967-10-19 | 1969-08-12 | 0 | Details |
| US3452252A | Device for protecting electrical apparatus | Expired / Lapsed | 1966-01-28 | 1969-06-24 | 0 | Details |
| US3450153A | Electrical pulse generator and regulator for fluid flow and… | Expired / Lapsed | 1967-06-26 | 1969-06-17 | 0 | Details |
| US3449554A | Offset compensation for numerical controls | Expired / Lapsed | 1967-08-28 | 1969-06-10 | 0 | Details |
| US3444525A | Centrally controlled multicomputer system | Expired / Lapsed | 1966-04-15 | 1969-05-13 | 0 | Details |
| US3441534A | Curable compositions | Expired / Lapsed | 1966-01-03 | 1969-04-29 | 0 | Details |
| US3441885A | High voltage current transformer having rigid secondary eye… | Expired / Lapsed | 1965-06-14 | 1969-04-29 | 0 | Details |
| US3440482A | Raster distortion correction transformer | Expired / Lapsed | 1966-02-14 | 1969-04-22 | 0 | Details |
| US3439283A | Frequency shift keyed discriminating circuits | Expired / Lapsed | 1966-02-04 | 1969-04-15 | 0 | Details |
| US3439329A | Electronic error detection and message routing system for a… | Expired / Lapsed | 1965-05-05 | 1969-04-15 | 0 | Details |
| US3432846A | Traveling sign controlled by logic circuitry and providing … | Expired / Lapsed | 1965-04-19 | 1969-03-11 | 0 | Details |
| US3431483A | Cycloconverter power circuits | Expired / Lapsed | 1966-12-30 | 1969-03-04 | 0 | Details |
| US3430640A | Supersonic inlet | Expired / Lapsed | 1964-02-17 | 1969-03-04 | 2 | Details |
| US3429020A | Process for construction of high temperature capacitor | Expired / Lapsed | 1967-05-23 | 1969-02-25 | 0 | Details |
| US3430209A | Memory utilization apparatus and method | Expired / Lapsed | 1966-11-25 | 1969-02-25 | 2 | Details |
| US3430088A | Wire terminal electroluminescent device and manufacture | Expired / Lapsed | 1966-09-30 | 1969-02-25 | 2 | Details |
| US3428250A | Furnace control system | Expired / Lapsed | 1967-05-23 | 1969-02-18 | 0 | Details |
| US3428792A | Velocity control system | Expired / Lapsed | 1965-06-21 | 1969-02-18 | 0 | Details |
| US3428876A | Absolute feedrate velocity control for multiaxes pulse resp… | Expired / Lapsed | 1965-01-18 | 1969-02-18 | 0 | Details |
| US3426748A | Stimulator analyzer and locater | Expired / Lapsed | 1965-11-23 | 1969-02-11 | 0 | Details |
| US3427585A | Data receiving and transmitting system | Expired / Lapsed | 1965-05-19 | 1969-02-11 | 0 | Details |
| US3425039A | Data processing system employing indirect character address… | Expired / Lapsed | 1966-06-27 | 1969-01-28 | 0 | Details |
| US3422765A | Superconducting liquid helium pump | Expired / Lapsed | 1967-03-24 | 1969-01-21 | 0 | Details |
| US3417235A | System to regulate position of a plurality of objects with … | Expired / Lapsed | 1967-04-04 | 1968-12-17 | 0 | Details |
| US3416533A | Conductive catheter | Expired / Lapsed | 1966-05-20 | 1968-12-17 | 0 | Details |
| US3416534A | Body organ electrode | Expired / Lapsed | 1966-04-11 | 1968-12-17 | 0 | Details |
| US3413613A | Reconfigurable data processing system | Expired / Lapsed | 1966-06-17 | 1968-11-26 | 2 | Details |
| US3413454A | High speed data processing system | Expired / Lapsed | 1958-10-24 | 1968-11-26 | 1 | Details |
| US3409880A | Apparatus for processing data records in a computer system | Expired / Lapsed | 1966-05-26 | 1968-11-05 | 2 | Details |
| US3403394A | Diversity radar system | Expired / Lapsed | 1966-07-19 | 1968-09-24 | 0 | Details |
| US3402399A | Word-organized associative cryotron memory | Expired / Lapsed | 1964-12-16 | 1968-09-17 | 0 | Details |
| US3400314A | Numerical positioning control system | Expired / Lapsed | 1965-05-27 | 1968-09-03 | 2 | Details |
| US3396510A | Liquid membranes for use in the separation of gases | Expired / Lapsed | 1966-08-15 | 1968-08-13 | 0 | Details |
| US3397086A | Photoconductive composition and coated article | Expired / Lapsed | 1965-03-12 | 1968-08-13 | 0 | Details |
| US3396377A | Display data processor | Expired / Lapsed | 1964-06-29 | 1968-08-06 | 0 | Details |
| US3395394A | Priority selector | Expired / Lapsed | 1965-10-20 | 1968-07-30 | 0 | Details |
| US3392143A | Polyamide compositions | Expired / Lapsed | 1967-05-15 | 1968-07-09 | 0 | Details |
| US3392045A | Epoxidized polyolefin-ethylene polymer compositions and lam… | Expired / Lapsed | 1966-01-17 | 1968-07-09 | 0 | Details |
| US3389950A | Fiber optics scan system | Expired / Lapsed | 1967-10-18 | 1968-06-25 | 0 | Details |
| US3389383A | Integrated circuit bistable memory cell | Expired / Lapsed | 1967-05-31 | 1968-06-18 | 0 | Details |
| US3384719A | Stereophonic speaker arrangement | Expired / Lapsed | 1964-10-21 | 1968-05-21 | 0 | Details |
| US3383977A | Method and apparatus for indicating the aim of projection-t… | Expired / Lapsed | 1963-12-30 | 1968-05-21 | 0 | Details |
| US3381226A | Zero crossing synchronous switching circuits for power semi… | Expired / Lapsed | 1965-05-18 | 1968-04-30 | 1 | Details |
| US3378743A | Current regulator for motor control systems including an op… | Expired / Lapsed | 1965-02-26 | 1968-04-16 | 0 | Details |
| US3378817A | Signalling systems | Expired / Lapsed | 1964-12-09 | 1968-04-16 | 2 | Details |
| US3377621A | Electronic data processing system with time sharing of memo… | Expired / Lapsed | 1965-04-14 | 1968-04-09 | 0 | Details |
| US3373688A | Pumps | Expired / Lapsed | 1965-07-30 | 1968-03-19 | 0 | Details |
| US3373268A | Process controller having electrochemical cell integrating … | Expired / Lapsed | 1964-02-24 | 1968-03-12 | 0 | Details |
| US3372318A | Semiconductor switches | Expired / Lapsed | 1965-01-22 | 1968-03-05 | 0 | Details |
| US3370676A | Mine hoist system including a main counter for level determ… | Expired / Lapsed | 1964-06-15 | 1968-02-27 | 0 | Details |
| US3370207A | Multilayer contact system for semiconductor devices includi… | Expired / Lapsed | 1964-02-24 | 1968-02-20 | 4 | Details |
| US3368153A | Shaper for producing uniform rectangular pulses from variou… | Expired / Lapsed | 1965-05-26 | 1968-02-06 | 0 | Details |
| US3368206A | Information shift apparatus in a data processing system | Expired / Lapsed | 1965-04-14 | 1968-02-06 | 0 | Details |
| US3365675A | Power amplifier control and protective circuit | Expired / Lapsed | 1965-01-04 | 1968-01-23 | 2 | Details |
| US3365626A | Electrical capacitor | Expired / Lapsed | 1960-10-19 | 1968-01-23 | 2 | Details |
| US3362160A | Gas turbine engine inspection apparatus | Expired / Lapsed | 1966-09-16 | 1968-01-09 | 2 | Details |
| US3359760A | Control for automatic washer | Expired / Lapsed | 1966-11-21 | 1967-12-26 | 2 | Details |
| US3357275A | Power tool | Expired / Lapsed | 1965-06-25 | 1967-12-12 | 2 | Details |
| US3353854A | Structural corner assembly | Expired / Lapsed | 1965-04-09 | 1967-11-21 | 2 | Details |
| US3351919A | Data recording and error detection system | Expired / Lapsed | 1965-05-19 | 1967-11-07 | 2 | Details |
| US3351913A | Memory system including means for selectively altering or n… | Expired / Lapsed | 1964-10-21 | 1967-11-07 | 2 | Details |
| US3350944A | Strain gauge pressure transducer | Expired / Lapsed | 1963-10-17 | 1967-11-07 | 2 | Details |
| US3350611A | Gate fired bidirectional switch | Expired / Lapsed | 1965-02-04 | 1967-10-31 | 2 | Details |
| US3350621A | Independently controlled rectifier bridge converter | Expired / Lapsed | 1964-03-25 | 1967-10-31 | 1 | Details |
| US3349229A | Apparatus to permit both contouring and numerical positioni… | Expired / Lapsed | 1963-07-08 | 1967-10-24 | 2 | Details |
| US3348116A | Electric knife storage case and battery charger | Expired / Lapsed | 1964-10-02 | 1967-10-17 | 2 | Details |
| US3346874A | Power control circuits | Expired / Lapsed | 1964-02-07 | 1967-10-10 | 2 | Details |
| US3342195A | Speed and motive fluid pressure control system for steam tu… | Expired / Lapsed | 1964-08-11 | 1967-09-19 | 2 | Details |
| US3340883A | Acceleration, speed and load control system with redundant … | Expired / Lapsed | 1966-04-12 | 1967-09-12 | 2 | Details |
| US3340951A | Speed control system | Expired / Lapsed | 1964-04-24 | 1967-09-12 | 2 | Details |
| US3335716A | Diagnostic thermography method and means | Expired / Lapsed | 1965-01-18 | 1967-08-15 | 2 | Details |
| US3335291A | Zero voltage switching circuit using gate controlled conduc… | Expired / Lapsed | 1965-03-11 | 1967-08-08 | 2 | Details |
| US3335349A | Speed detection and control systems incorporating a dc chop… | Expired / Lapsed | 1964-08-17 | 1967-08-08 | 2 | Details |
| US3335413A | Wide band optical recording and narrow band reproduction on… | Expired / Lapsed | 1963-12-19 | 1967-08-08 | 2 | Details |
| US3334334A | Signal change detector for process control computer | Expired / Lapsed | 1963-07-26 | 1967-08-01 | 2 | Details |
| US3333045A | Body implantable electrical conductor | Expired / Lapsed | 1965-07-20 | 1967-07-25 | 2 | Details |
| US3332143A | Semiconductor devices with epitaxial contour | Expired / Lapsed | 1964-12-28 | 1967-07-25 | 2 | Details |
| US3333250A | Buffering system for data communication | Expired / Lapsed | 1964-07-16 | 1967-07-25 | 2 | Details |
| US3332425A | Magnetic endoscope for probing the esophageal, stomachic, a… | Expired / Lapsed | 1964-06-05 | 1967-07-25 | 2 | Details |
| US3327306A | Optimized input adaptive control method and system | Expired / Lapsed | 1964-12-31 | 1967-06-20 | 1 | Details |
| US3327101A | Automatic control apparatus | Expired / Lapsed | 1962-11-21 | 1967-06-20 | 2 | Details |
| US3325434A | Polytetrafluoroethylene-silicone rubber extrusion compositi… | Expired / Lapsed | 1965-04-27 | 1967-06-13 | 1 | Details |
| US3325633A | Numerical control system to keep object position within pre… | Expired / Lapsed | 1963-07-24 | 1967-06-13 | 2 | Details |
| US3325325A | Method of making polyethylene insulated electrical conducto… | Expired / Lapsed | 1962-12-17 | 1967-06-13 | 2 | Details |
| US3324447A | Electrical connector | Expired / Lapsed | 1965-05-28 | 1967-06-06 | 2 | Details |
| US3324393A | Magneto-optical electric current sensing arrangement | Expired / Lapsed | 1963-07-26 | 1967-06-06 | 2 | Details |
| US3321641A | Snap-action trigger circuit for semiconductor switching dev… | Expired / Lapsed | 1964-05-18 | 1967-05-23 | 2 | Details |
| US3321639A | Direct coupled, current mode logic | Expired / Lapsed | 1962-12-03 | 1967-05-23 | 2 | Details |
| US3321746A | Cryogenic associative memory | Expired / Lapsed | 1962-09-27 | 1967-05-23 | 2 | Details |
| US3316130A | Epitaxial growth of semiconductor devices | Expired / Lapsed | 1963-05-07 | 1967-04-25 | 2 | Details |
| US3315111A | Flexible electroluminescent device and light transmissive e… | Expired / Lapsed | 1966-06-09 | 1967-04-18 | 4 | Details |
| US3315234A | Data editing apparatus | Expired / Lapsed | 1964-03-02 | 1967-04-18 | 2 | Details |
| US3311303A | Programmer | Expired / Lapsed | 1965-09-28 | 1967-03-28 | 2 | Details |
| US3311889A | Data communication processor | Expired / Lapsed | 1963-08-13 | 1967-03-28 | 2 | Details |
| US3310785A | Data processing unit for selectively controlling access to … | Expired / Lapsed | 1964-05-04 | 1967-03-21 | 2 | Details |
| US3308442A | Data processing unit for providing data shift under selecti… | Expired / Lapsed | 1964-05-04 | 1967-03-07 | 2 | Details |
| US3307152A | Data transmission system with control character insertions | Expired / Lapsed | 1963-05-31 | 1967-02-28 | 1 | Details |
| US3305633A | Laser optical system | Expired / Lapsed | 1963-06-26 | 1967-02-21 | 2 | Details |
| US3303360A | Semiconductor switch | Expired / Lapsed | 1966-01-21 | 1967-02-07 | 2 | Details |
| US3301780A | Preparation of compacted body of improved lubricating agents | Expired / Lapsed | 1964-05-05 | 1967-01-31 | 2 | Details |
| US3302181A | Digital input-output buffer for computerized systems | Expired / Lapsed | 1963-06-17 | 1967-01-31 | 2 | Details |
| US3299223A | Pushbutton switch assembly with flashover protection delay … | Expired / Lapsed | 1966-04-27 | 1967-01-17 | 2 | Details |
| US3298001A | Data processing unit for providing selective memory address… | Expired / Lapsed | 1964-05-04 | 1967-01-10 | 2 | Details |
| US3290622A | Microwave ferromagnetic phase shifter having controllable d… | Expired / Lapsed | 1963-11-27 | 1966-12-06 | 2 | Details |
| US3289070A | Circuitry for obviating the effects caused by subtransient … | Expired / Lapsed | 1963-04-05 | 1966-11-29 | 2 | Details |
| US3284688A | D.-c. current regulator including a high gain saturating am… | Expired / Lapsed | 1965-07-27 | 1966-11-08 | 2 | Details |
| US3283234A | Control for reversible motor with instantaneous current lim… | Expired / Lapsed | 1964-01-10 | 1966-11-01 | 2 | Details |
| US3277395A | Pluse width modulator | Expired / Lapsed | 1963-11-18 | 1966-10-04 | 2 | Details |
| US3274443A | Redundant speed control system | Expired / Lapsed | 1963-12-05 | 1966-09-20 | 2 | Details |
| US3273018A | Fast action current limiting circuit employing release of s… | Expired / Lapsed | 1964-09-15 | 1966-09-13 | 2 | Details |
| US3270321A | Selective data sampling system | Expired / Lapsed | 1962-02-02 | 1966-08-30 | 2 | Details |
| US3268361A | Thermoplastic recording member | Expired / Lapsed | 1962-11-20 | 1966-08-23 | 2 | Details |
| US3267434A | Information handling system | Expired / Lapsed | 1961-07-05 | 1966-08-16 | 2 | Details |
| US3265855A | Method and apparatus for drilling small holes | Expired / Lapsed | 1963-04-01 | 1966-08-09 | 2 | Details |
| US3264457A | Hybrid digital-analog nonlinear function generator | Expired / Lapsed | 1962-12-26 | 1966-08-02 | 1 | Details |
| US3264544A | Counter e. m. f. speed control | Expired / Lapsed | 1962-06-08 | 1966-08-02 | 2 | Details |
| US3264633A | Automatic power meter reading over neutral power transmissi… | Expired / Lapsed | 1961-03-22 | 1966-08-02 | 0 | Details |
| US3260962A | Gated pulse generator with time delay | Expired / Lapsed | 1964-01-02 | 1966-07-12 | 2 | Details |
| US3258828A | Method of producing a superconductive solenoid disc | Expired / Lapsed | 1965-03-22 | 1966-07-05 | 2 | Details |
| US3251222A | Strain sensitive apparatus and elements therefor | Expired / Lapsed | 1961-04-20 | 1966-05-17 | 2 | Details |
| US3250443A | Dispensing cartridge plunger | Expired / Lapsed | 1964-12-21 | 1966-05-10 | 2 | Details |
| US3248758A | Mold for the manufacture of polyurethane foam articles | Expired / Lapsed | 1964-05-15 | 1966-05-03 | 0 | Details |
| US3248622A | Position control system utilizing a coarse analog compariso… | Expired / Lapsed | 1961-09-05 | 1966-04-26 | 2 | Details |
| US3247422A | Transistor inverter ballasting circuit | Expired / Lapsed | 1961-06-01 | 1966-04-19 | 2 | Details |
| US3244174A | Body implantable conductor | Expired / Lapsed | 1964-01-31 | 1966-04-05 | 0 | Details |
| US3243620A | Synchronous induction motors having an improved rotor const… | Expired / Lapsed | 1963-05-01 | 1966-03-29 | 1 | Details |
| US3242643A | Method and apparatus for degasifying epoxy resin | Expired / Lapsed | 1963-03-04 | 1966-03-29 | 2 | Details |
| US3241124A | Ranking matrix | Expired / Lapsed | 1961-07-25 | 1966-03-15 | 2 | Details |
| US3239819A | Data processing system including priority feature for plura… | Expired / Lapsed | 1962-05-01 | 1966-03-08 | 2 | Details |
| US3238839A | Optical thickness gauge | Expired / Lapsed | 1962-03-29 | 1966-03-08 | 2 | Details |
| US3237160A | Semiconductor multiple-word correlator | Expired / Lapsed | 1962-07-31 | 1966-02-22 | 2 | Details |
| US3235844A | Adaptive system | Expired / Lapsed | 1960-02-08 | 1966-02-15 | 2 | Details |
| US3234458A | Method for determining resistivity of a metal | Expired / Lapsed | 1960-11-28 | 1966-02-08 | 2 | Details |
| US3229182A | Armature voltage sensing and indicating circuit | Expired / Lapsed | 1962-03-07 | 1966-01-11 | 0 | Details |
| US3227397A | Roll rate stabilization system for outer space vehicle | Expired / Lapsed | 1959-11-30 | 1966-01-04 | 1 | Details |
| US3225334A | Data processing system including plural peripheral devices … | Expired / Lapsed | 1962-05-01 | 1965-12-21 | 2 | Details |
| US3221132A | Non-resonant oven cavity and resonant antenna system for mi… | Expired / Lapsed | 1963-07-22 | 1965-11-30 | 2 | Details |
| US3221317A | Audible indicator circuit | Expired / Lapsed | 1962-06-27 | 1965-11-30 | 2 | Details |
| US3218758A | Photosynthetic apparatus | Expired / Lapsed | 1962-12-20 | 1965-11-23 | 1 | Details |
| US3216227A | Clothes washing machines | Expired / Lapsed | 1963-10-08 | 1965-11-09 | 2 | Details |
| US3214708A | Frequency-type telemeter transmitter | Expired / Lapsed | 1962-03-28 | 1965-10-26 | 2 | Details |
| US3213450A | Undesired signal canceller | Expired / Lapsed | 1962-12-21 | 1965-10-19 | 1 | Details |
| US3212401A | Inhomogeneous magnesia-alumina optical lens | Expired / Lapsed | 1962-10-03 | 1965-10-19 | 2 | Details |
| US3210665A | Mobile radio with timing circuit for automatically energizi… | Expired / Lapsed | 1962-12-31 | 1965-10-05 | 2 | Details |
| US3208683A | Automatic control systems for rolling mills | Expired / Lapsed | 1962-12-03 | 1965-09-28 | 2 | Details |
| US3207974A | Inverter circuits | Expired / Lapsed | 1961-02-23 | 1965-09-21 | 2 | Details |
| US3206331A | Method for coating articles with pyrolitic graphite | Expired / Lapsed | 1961-04-25 | 1965-09-14 | 2 | Details |
| US3205355A | Moisture gage standards | Expired / Lapsed | 1963-03-21 | 1965-09-07 | 2 | Details |
| US3205501A | Closely spaced stocked waveguide antenna array employing re… | Expired / Lapsed | 1959-10-01 | 1965-09-07 | 1 | Details |
| US3189662A | Organopolysiloxane-polycarbonate block copolymers | Expired / Lapsed | 1961-01-23 | 1965-06-15 | 2 | Details |
| US3188518A | Undulating beam traveling wave tube focusing structure | Expired / Lapsed | 1961-09-26 | 1965-06-08 | 2 | Details |
| US3188537A | Device for asymmetric conduct of current | Expired / Lapsed | 1961-08-31 | 1965-06-08 | 1 | Details |
| US3186835A | High density germanium | Expired / Lapsed | 1962-07-30 | 1965-06-01 | 2 | Details |
| US3186228A | Time-temperature integrator | Expired / Lapsed | 1960-06-30 | 1965-06-01 | 2 | Details |
| US3181933A | Radioactive diamond and process for the preparation thereof | Expired / Lapsed | 1961-02-28 | 1965-05-04 | 2 | Details |
| US3178522A | Rocker-type switch with integral spring and c-shaped contac… | Expired / Lapsed | 1962-03-14 | 1965-04-13 | 2 | Details |
| US3177418A | Armature current limiting speed control systems for electri… | Expired / Lapsed | 1962-10-18 | 1965-04-06 | 2 | Details |
| US3177417A | Motor control system responsive to armature c. e. m. f. | Expired / Lapsed | 1962-09-17 | 1965-04-06 | 2 | Details |
| US3177321A | Condition responsive electric switch mechanism | Expired / Lapsed | 1962-03-29 | 1965-04-06 | 2 | Details |
| US3177350A | Transistorized step multiplier | Expired / Lapsed | 1961-05-31 | 1965-04-06 | 1 | Details |
| US3176212A | Direct current power supplies | Expired / Lapsed | 1958-12-19 | 1965-03-30 | 2 | Details |
| US3174367A | Control system | Expired / Lapsed | 1962-07-31 | 1965-03-23 | 1 | Details |
| US3174032A | Adapting quantized filter | Expired / Lapsed | 1960-10-06 | 1965-03-16 | 1 | Details |
| US3173000A | System for synchronizing punched card readers | Expired / Lapsed | 1962-02-21 | 1965-03-09 | 2 | Details |
| US3173001A | Automatic control apparatus | Expired / Lapsed | 1961-09-05 | 1965-03-09 | 2 | Details |
| US3169242A | Identification interrogating system | Expired / Lapsed | 1963-03-19 | 1965-02-09 | 2 | Details |
| US3167748A | Cryotron memory | Expired / Lapsed | 1962-07-05 | 1965-01-26 | 1 | Details |
| US3165741A | Phase stable multi-channel pulse compression radar systems | Expired / Lapsed | 1961-12-29 | 1965-01-12 | 1 | Details |
| US3164909A | Automatic gauging system | Expired / Lapsed | 1959-01-14 | 1965-01-12 | 1 | Details |
| US3164696A | Vane operated magnetic reed switch | Expired / Lapsed | 1961-08-04 | 1965-01-05 | 2 | Details |
| US3164771A | Apparatus for central recording of remote meter data by per… | Expired / Lapsed | 1960-12-08 | 1965-01-05 | 2 | Details |
| US3164807A | Function generator | Expired / Lapsed | 1959-12-31 | 1965-01-05 | 0 | Details |
| US3162764A | Space vehicle attitude control | Expired / Lapsed | 1961-01-03 | 1964-12-22 | 1 | Details |
| US3161365A | Uncoiler control system | Expired / Lapsed | 1962-02-23 | 1964-12-15 | 2 | Details |
| US3161857A | Electronic data processor | Expired / Lapsed | 1960-12-16 | 1964-12-15 | 2 | Details |
| US3161855A | Electronic data processor | Expired / Lapsed | 1960-12-09 | 1964-12-15 | 1 | Details |
| US3160280A | Device for mounting apparatus | Expired / Lapsed | 1963-08-12 | 1964-12-08 | 2 | Details |
| US3159601A | Platinum-olefin complex catalyzed addition of hydrogen- and… | Expired / Lapsed | 1962-07-02 | 1964-12-01 | 2 | Details |
| US3158786A | Overcurrent protection device | Expired / Lapsed | 1962-06-26 | 1964-11-24 | 2 | Details |
| US3158799A | Firing circuit for controlled rectifiers | Expired / Lapsed | 1960-01-18 | 1964-11-24 | 2 | Details |
| US3156804A | Slidable switch mechanism for an electric toothbrush | Expired / Lapsed | 1962-05-31 | 1964-11-10 | 2 | Details |
| US3155777A | Balanced static switching circuits | Expired / Lapsed | 1961-06-29 | 1964-11-03 | 1 | Details |
| US3152297A | Frequency converter | Expired / Lapsed | 1961-08-07 | 1964-10-06 | 2 | Details |
| US3150904A | Anti-tip device | Expired / Lapsed | 1963-03-18 | 1964-09-29 | 2 | Details |
| US3150905A | Anti-tip device | Expired / Lapsed | 1963-03-18 | 1964-09-29 | 2 | Details |
| US3151295A | Communication system employing means for adjusting the powe… | Expired / Lapsed | 1960-12-08 | 1964-09-29 | 1 | Details |
| US3150307A | Solid state controlled rectifier circuits and apparatus | Expired / Lapsed | 1962-09-17 | 1964-09-22 | 0 | Details |
| US3150264A | Infrared reflection and absorption system for measuring the… | Expired / Lapsed | 1961-10-09 | 1964-09-22 | 1 | Details |
| US3147343A | Signal recognition system | Expired / Lapsed | 1961-06-15 | 1964-09-01 | 2 | Details |
| US3147477A | Speed measuring system | Expired / Lapsed | 1957-12-26 | 1964-09-01 | 1 | Details |
| US3146392A | Control circuits employing unijunction transistors for firi… | Expired / Lapsed | 1961-08-02 | 1964-08-25 | 2 | Details |
| US3144638A | Time compression storage circuit | Expired / Lapsed | 1960-12-29 | 1964-08-11 | 1 | Details |
| US3142852A | Automatic toothbrush | Expired / Lapsed | 1962-05-31 | 1964-08-04 | 2 | Details |
| US3139539A | Control circuit producing output signal so long as input pu… | Expired / Lapsed | 1962-03-30 | 1964-06-30 | 2 | Details |
| US3138177A | Flow control device | Expired / Lapsed | 1961-09-06 | 1964-06-23 | 2 | Details |
| US3138435A | Deposition apparatus and method for forming a pyrolytic gra… | Expired / Lapsed | 1961-06-26 | 1964-06-23 | 4 | Details |
| US3138686A | Thermal switch device | Expired / Lapsed | 1961-02-01 | 1964-06-23 | 2 | Details |
| US3136183A | Slowdown control for reversing hot mill | Expired / Lapsed | 1961-08-29 | 1964-06-09 | 2 | Details |
| US3134949A | Negative resistance frequency modulated oscillator | Expired / Lapsed | 1960-01-08 | 1964-05-26 | 2 | Details |
| US3134697A | Fuel cell | Expired / Lapsed | 1959-11-03 | 1964-05-26 | 2 | Details |
| US3133209A | Switching circuit utilizing two silicon controlled rectifie… | Expired / Lapsed | 1962-05-14 | 1964-05-12 | 2 | Details |
| US3132325A | Electro-optical shift register | Expired / Lapsed | 1959-09-24 | 1964-05-05 | 2 | Details |
| US3129381A | Magnetic amplifier with shunt-load and amplitude controlled… | Expired / Lapsed | 1960-02-04 | 1964-04-14 | 2 | Details |
| US3128396A | Lock out control circuit for power amplifier | Expired / Lapsed | 1961-09-25 | 1964-04-07 | 1 | Details |
| US3122062A | Arc discharge controlled fluid amplifier | Expired / Lapsed | 1962-01-23 | 1964-02-25 | 1 | Details |
| US3118468A | Resilient material check valve | Expired / Lapsed | 1961-04-20 | 1964-01-21 | 2 | Details |
| US3117203A | Circuit protective devices and circuits | Expired / Lapsed | 1960-05-17 | 1964-01-07 | 1 | Details |
| US3117221A | Electrical power computer apparatus | Expired / Lapsed | 1959-04-30 | 1964-01-07 | 2 | Details |
| US3116191A | Method of making storage electrode structure | Expired / Lapsed | 1961-07-12 | 1963-12-31 | 2 | Details |
| US3114872A | Constant current source | Expired / Lapsed | 1961-12-29 | 1963-12-17 | 2 | Details |
| US3114900A | Automatic incremental metering | Expired / Lapsed | 1960-12-08 | 1963-12-17 | 2 | Details |
| US3114884A | Adaptive filter | Expired / Lapsed | 1960-02-08 | 1963-12-17 | 2 | Details |
| US3112619A | Refrigerator including defrost control means | Expired / Lapsed | 1962-04-18 | 1963-12-03 | 1 | Details |
| US3113179A | Method and apparatus for recording | Expired / Lapsed | 1960-02-15 | 1963-12-03 | 2 | Details |
| US3111010A | Air conditioning control apparatus | Expired / Lapsed | 1962-09-06 | 1963-11-19 | 2 | Details |
| US3111032A | Temperature measurement system | Expired / Lapsed | 1961-12-07 | 1963-11-19 | 2 | Details |
| US3111645A | Waveform recognition system | Expired / Lapsed | 1959-05-01 | 1963-11-19 | 2 | Details |
| US3107180A | Process for deposition of pyrolytic graphite | Expired / Lapsed | 1961-01-26 | 1963-10-15 | 2 | Details |
| US3103648A | Adaptive neuron having improved output | Expired / Lapsed | 1961-08-22 | 1963-09-10 | 2 | Details |
| US3103661A | Impulse systems | Expired / Lapsed | 1941-06-27 | 1963-09-10 | 2 | Details |
| US3100268A | Sympathetic silicon controlled rectifier circuit | Expired / Lapsed | 1960-08-23 | 1963-08-06 | 2 | Details |
| US3098949A | Controlled rectifier d. c. switching circuit | Expired / Lapsed | 1960-05-20 | 1963-07-23 | 2 | Details |
| US3098189A | Cryogenic d. c. to a. c. amplifier | Expired / Lapsed | 1960-04-11 | 1963-07-16 | 2 | Details |
| US3098215A | Data storage and transmission system | Expired / Lapsed | 1957-12-27 | 1963-07-16 | 1 | Details |
| US3095534A | Circuit for controlling energization of a direct current lo… | Expired / Lapsed | 1960-11-22 | 1963-06-25 | 2 | Details |
| US3092732A | Maximum signal identifying circuit | Expired / Lapsed | 1959-05-01 | 1963-06-04 | 2 | Details |
| US3088065A | Self-regulated static frequency converter | Expired / Lapsed | 1958-09-12 | 1963-04-30 | 2 | Details |
| US3085431A | Flow measuring apparatus | Expired / Lapsed | 1959-12-28 | 1963-04-16 | 2 | Details |
| US3086121A | Photosensitive code reading system | Expired / Lapsed | 1959-10-27 | 1963-04-16 | 1 | Details |
| FR1324170A | Improvements in semiconductor devices and their fabrication | Expired / Lapsed | 1962-06-05 | 1963-04-12 | 0 | Details |
| US3083123A | Magnesia alumina spinel articles and process of preparing s… | Expired / Lapsed | 1960-06-01 | 1963-03-26 | 2 | Details |
| US3083319A | Temperature responsive system | Expired / Lapsed | 1959-12-24 | 1963-03-26 | 1 | Details |
| US3078232A | Process for making conducting cubic boron nitride and produ… | Expired / Lapsed | 1960-01-18 | 1963-02-19 | 2 | Details |
| US3076924A | Magnetic voltage stabilizer employing controlled silicon re… | Expired / Lapsed | 1960-02-04 | 1963-02-05 | 2 | Details |
| US3070739A | Control system for solid state controlled rectifier | Expired / Lapsed | 1960-05-23 | 1962-12-25 | 0 | Details |
| US3069909A | Temperature reference block | Expired / Lapsed | 1959-05-11 | 1962-12-25 | 0 | Details |
| US3064174A | Motor speed control circuits | Expired / Lapsed | 1961-05-18 | 1962-11-13 | 0 | Details |
| US3060380A | Sideband detector circuit | Expired / Lapsed | 1958-02-03 | 1962-10-23 | 0 | Details |
| US3055203A | Automatic washer-dryer including a pre-spin impulse speed a… | Expired / Lapsed | 1959-10-01 | 1962-09-25 | 0 | Details |
| US3054966A | Crystal controlled oscillator with temperature compensating… | Expired / Lapsed | 1959-07-15 | 1962-09-18 | 0 | Details |
| US3052967A | Porous metallic material and method | Expired / Lapsed | 1959-09-14 | 1962-09-11 | 2 | Details |
| US3051813A | Temperature control systems | Expired / Lapsed | 1960-08-24 | 1962-08-28 | 0 | Details |
| US3051535A | Dry lubricant ball-type bearing with non-rotating balls | Expired / Lapsed | 1959-11-20 | 1962-08-28 | 0 | Details |
| US3050865A | Control system for clothes dryers | Expired / Lapsed | 1959-07-09 | 1962-08-28 | 0 | Details |
| US3050611A | Temperature control systems | Expired / Lapsed | 1961-01-03 | 1962-08-21 | 0 | Details |
| US3046772A | Washing machine drive system | Expired / Lapsed | 1960-02-29 | 1962-07-31 | 0 | Details |
| US3047789A | Inverter circuit | Expired / Lapsed | 1959-11-25 | 1962-07-31 | 0 | Details |
| US3046464A | Unsymmetrical stabilization | Expired / Lapsed | 1960-01-06 | 1962-07-24 | 0 | Details |
| US3042838A | Direct current static electric switch | Expired / Lapsed | 1960-12-16 | 1962-07-03 | 0 | Details |
| US3042741A | Electric circuit board | Expired / Lapsed | 1959-05-29 | 1962-07-03 | 0 | Details |
| US3042428A | Copper-aluminum tubular connector | Expired / Lapsed | 1954-04-05 | 1962-07-03 | 0 | Details |
| US3040543A | Air conditioning unit having low fan speed over-ride means | Expired / Lapsed | 1960-12-22 | 1962-06-26 | 0 | Details |
| US3040127A | Optical system | Expired / Lapsed | 1959-08-03 | 1962-06-19 | 0 | Details |
| US3040261A | Suppression of harmonics in detection | Expired / Lapsed | 1957-01-22 | 1962-06-19 | 0 | Details |
| US3037457A | Pumps | Expired / Lapsed | 1959-08-26 | 1962-06-05 | 0 | Details |
| US3036368A | End terminal for sheathed tubular heater and method of manu… | Expired / Lapsed | 1959-07-28 | 1962-05-29 | 0 | Details |
| US3035759A | Rotor and stator construction | Expired / Lapsed | 1957-11-13 | 1962-05-22 | 0 | Details |
| US3035216A | Angle and arcuate position control system | Expired / Lapsed | 1959-11-19 | 1962-05-15 | 0 | Details |
| US3033727A | Process for making void-free insulated conductors | Expired / Lapsed | 1956-11-09 | 1962-05-08 | 2 | Details |
| US3031601A | Circuit protective apparatus | Expired / Lapsed | 1960-09-27 | 1962-04-24 | 0 | Details |
| US3026485A | Unijunction relaxation oscillator with transistor, in disch… | Expired / Lapsed | 1959-12-07 | 1962-03-20 | 0 | Details |
| US3026475A | Frequency scanning filter arrangement | Expired / Lapsed | 1958-01-13 | 1962-03-20 | 0 | Details |
| US3025476A | Crystal controlled high frequency transistor oscillator | Expired / Lapsed | 1958-06-18 | 1962-03-13 | 0 | Details |
| US3024401A | Motor control circuit | Expired / Lapsed | 1960-08-24 | 1962-03-06 | 0 | Details |
| US3018449A | Electronic commutator | Expired / Lapsed | 1959-11-25 | 1962-01-23 | 0 | Details |
| US3017103A | Service-charge calculation system | Expired / Lapsed | 1958-11-24 | 1962-01-16 | 0 | Details |
| US3015739A | Direct-current charged magnetic modulator | Expired / Lapsed | 1958-10-31 | 1962-01-02 | 0 | Details |
| US3015730A | Electronic curve follower | Expired / Lapsed | 1956-10-26 | 1962-01-02 | 0 | Details |
| US3015458A | Stall and high speed bufffeting limiter for aircraft | Expired / Lapsed | 1956-10-01 | 1962-01-02 | 0 | Details |
| US3013215A | Temperature controlled transistor circuit | Expired / Lapsed | 1959-06-16 | 1961-12-12 | 0 | Details |
| US3013254A | Information storage apparatus | Expired / Lapsed | 1957-01-23 | 1961-12-12 | 0 | Details |
| US3010308A | High expansion ratio condensation nuclei apparatus | Expired / Lapsed | 1957-12-06 | 1961-11-28 | 0 | Details |
| US3009332A | Variable output air conditioning unit and control arrangeme… | Expired / Lapsed | 1960-09-16 | 1961-11-21 | 0 | Details |
| US3009638A | Trigonometric function generator | Expired / Lapsed | 1959-06-26 | 1961-11-21 | 0 | Details |
| US3009033A | Limit switches | Expired / Lapsed | 1959-04-20 | 1961-11-14 | 0 | Details |
| US3008044A | Application of superconductivity in guiding charged particl… | Expired / Lapsed | 1960-02-25 | 1961-11-07 | 0 | Details |
| US3006184A | Ultrasound thickness gauge | Expired / Lapsed | 1957-06-17 | 1961-10-31 | 0 | Details |
| US3004429A | Dynamic flowmeter | Expired / Lapsed | 1956-02-29 | 1961-10-17 | 0 | Details |
| US3001116A | Servosystem inverse gain changer | Expired / Lapsed | 1957-10-28 | 1961-09-19 | 0 | Details |
| US3000000A | Automatic reading system | Expired / Lapsed | 1955-05-06 | 1961-09-12 | 0 | Details |
| US2997665A | Multivibrator circuit having a bistable circuit driving and… | Expired / Lapsed | 1959-07-22 | 1961-08-22 | 0 | Details |
| US2997596A | Bistable electro-optical network | Expired / Lapsed | 1957-12-27 | 1961-08-22 | 0 | Details |
| US2994767A | Power conserving mixer and oscillator | Expired / Lapsed | 1958-08-21 | 1961-08-01 | 0 | Details |
| US2994125A | Hard surface metal structure | Expired / Lapsed | 1956-12-26 | 1961-08-01 | 2 | Details |
| US2991572A | Fill and steam control valve assembly for steam irons | Expired / Lapsed | 1959-04-20 | 1961-07-11 | 0 | Details |
| US2992395A | Feedback amplifier circuit | Expired / Lapsed | 1958-12-30 | 1961-07-11 | 0 | Details |
| US2992330A | Position indicating system | Expired / Lapsed | 1957-09-05 | 1961-07-11 | 0 | Details |
| US2992408A | Automatic reading system | Expired / Lapsed | 1955-05-16 | 1961-07-11 | 0 | Details |
| US2986913A | Vertical-axis washing and centrifuging machine | Expired / Lapsed | 1960-10-10 | 1961-06-06 | 0 | Details |
| US2987666A | Solid state power stage amplifier employing silicon rectifi… | Expired / Lapsed | 1959-02-02 | 1961-06-06 | 0 | Details |
| US2985866A | Information storage system | Expired / Lapsed | 1958-09-29 | 1961-05-23 | 0 | Details |
| US2985755A | Communication system | Expired / Lapsed | 1957-05-27 | 1961-05-23 | 0 | Details |
| US2984742A | Circuit for a transistor class a output stage | Expired / Lapsed | 1956-07-27 | 1961-05-16 | 0 | Details |
| US2983822A | Form recognition method and system therefor | Expired / Lapsed | 1957-09-30 | 1961-05-09 | 0 | Details |
| US2982907A | Control system | Expired / Lapsed | 1958-10-14 | 1961-05-02 | 0 | Details |
| US2982368A | Automatic batch-weighing control system | Expired / Lapsed | 1957-06-26 | 1961-05-02 | 0 | Details |
| US2980332A | Electronic curve follower and analog computer | Expired / Lapsed | 1956-10-26 | 1961-04-18 | 0 | Details |
| US2977523A | Control circuit | Expired / Lapsed | 1958-12-31 | 1961-03-28 | 0 | Details |
| US2975345A | Electric capacitor | Expired / Lapsed | 1957-05-15 | 1961-03-14 | 0 | Details |
| US2975290A | Electroluminescent devices and networks | Expired / Lapsed | 1956-05-15 | 1961-03-14 | 0 | Details |
| US2970806A | Balanced governing valve with minimum reaction gradients | Expired / Lapsed | 1960-01-21 | 1961-02-07 | 0 | Details |
| US2969442A | Detent mechanism for alternating current switch | Expired / Lapsed | 1958-07-30 | 1961-01-24 | 0 | Details |
| US2963268A | Pressurized seal | Expired / Lapsed | 1957-03-25 | 1960-12-06 | 0 | Details |
| US2962598A | Electric power control system | Expired / Lapsed | 1956-05-28 | 1960-11-29 | 0 | Details |
| US2958735A | Video tape recording system | Expired / Lapsed | 1956-02-24 | 1960-11-01 | 0 | Details |
| US2957340A | Ultrasonic image detector | Expired / Lapsed | 1956-03-15 | 1960-10-25 | 0 | Details |
| US2954476A | Photo-electronic network | Expired / Lapsed | 1958-11-03 | 1960-09-27 | 0 | Details |
| CA605397A | Temperature stabilized transistor amplifier | Expired / Lapsed | — | 1960-09-20 | 0 | Details |
| US2950375A | Percolator brew strength control | Expired / Lapsed | 1954-04-23 | 1960-08-23 | 0 | Details |
| US2947610A | Method of making diamonds | Expired / Lapsed | 1958-01-06 | 1960-08-02 | 2 | Details |
| US2945976A | Electroluminescent lamp and manufacture thereof | Expired / Lapsed | 1957-12-10 | 1960-07-19 | 0 | Details |
| US2943474A | Washing machine recirculation system | Expired / Lapsed | 1957-06-20 | 1960-07-05 | 0 | Details |
| US2943147A | Projection system | Expired / Lapsed | 1958-01-13 | 1960-06-28 | 0 | Details |
| US2943251A | Control of machine tool operation | Expired / Lapsed | 1955-12-06 | 1960-06-28 | 0 | Details |
| US2941139A | Constant output control system for aircraft and the like | Expired / Lapsed | 1956-08-31 | 1960-06-14 | 0 | Details |
| US2940026A | Variable bandwith servomechanism | Expired / Lapsed | 1957-06-18 | 1960-06-07 | 0 | Details |
| US2940069A | Combined supervisory control and telemetering system | Expired / Lapsed | 1954-11-15 | 1960-06-07 | 0 | Details |
| US2938669A | Quality control device | Expired / Lapsed | 1953-07-06 | 1960-05-31 | 0 | Details |
| US2938136A | Electroluminescent lamp | Expired / Lapsed | 1958-08-26 | 1960-05-24 | 0 | Details |
| US2937239A | Skew servo for multiple channel recording system | Expired / Lapsed | 1956-02-13 | 1960-05-17 | 0 | Details |
| US2937365A | Programming control system | Expired / Lapsed | 1955-12-28 | 1960-05-17 | 0 | Details |
| US2936409A | Current rectifier assemblies | Expired / Lapsed | 1956-12-13 | 1960-05-10 | 0 | Details |
| US2936296A | Polyesters from terephthalic acid, ethylene glycol and a hi… | Expired / Lapsed | 1954-12-10 | 1960-05-10 | 2 | Details |
| US2933547A | Solid state electric cell | Expired / Lapsed | 1955-06-29 | 1960-04-19 | 2 | Details |
| US2930083A | Extrusion of cross-linked polyethylene and process of coati… | Expired / Lapsed | 1957-08-30 | 1960-03-29 | 2 | Details |
| US2929921A | Code controlled communication system | Expired / Lapsed | 1955-01-26 | 1960-03-22 | 0 | Details |
| US2928980A | Color information presentation system | Expired / Lapsed | 1956-08-16 | 1960-03-15 | 0 | Details |
| US2924812A | Automatic reading system | Expired / Lapsed | 1957-10-31 | 1960-02-09 | 0 | Details |
| US2922937A | Capacitor and dielectric material therefor | Expired / Lapsed | 1956-02-08 | 1960-01-26 | 1 | Details |
| US2921006A | Polymerization with high energy electrons | Expired / Lapsed | 1952-06-03 | 1960-01-12 | 2 | Details |
| US2920232A | Display device with storage | Expired / Lapsed | 1958-08-18 | 1960-01-05 | 0 | Details |
| US2919473A | Molding of polyethylene irradiated with high energy electro… | Expired / Lapsed | 1954-06-17 | 1960-01-05 | 2 | Details |
| US2919302A | Color information presenting system | Expired / Lapsed | 1957-10-07 | 1959-12-29 | 0 | Details |
| US2918662A | Magnetic tape arrangement system | Expired / Lapsed | 1957-06-03 | 1959-12-22 | 0 | Details |
| US2917175A | Unbalance sensing arrangement for machines having a centrif… | Expired / Lapsed | 1959-01-22 | 1959-12-15 | 0 | Details |
| US2916685A | Direct current motor speed control system | Expired / Lapsed | 1956-08-13 | 1959-12-08 | 0 | Details |
| US2915599A | Logarithmic amplifier | Expired / Lapsed | 1952-06-06 | 1959-12-01 | 0 | Details |
| US2913637A | Photoconductive control circuit | Expired / Lapsed | 1955-12-28 | 1959-11-17 | 0 | Details |
| US2913511A | Fuel cell | Expired / Lapsed | 1955-06-29 | 1959-11-17 | 2 | Details |
| US2912569A | Communication system with automatic amplitude control | Expired / Lapsed | 1955-11-30 | 1959-11-10 | 0 | Details |
| US2908147A | Room air conditioning apparatus having filter arrangement f… | Expired / Lapsed | 1957-04-08 | 1959-10-13 | 0 | Details |
| US2907938A | Position control system | Expired / Lapsed | 1957-04-11 | 1959-10-06 | 0 | Details |
| US2902831A | Governing system for reheat steam turbine powerplant | Expired / Lapsed | 1958-08-22 | 1959-09-08 | 0 | Details |
| US2901652A | Electroluminescent lamp construction | Expired / Lapsed | 1957-12-10 | 1959-08-25 | 0 | Details |
| US2901745A | Signal processing arrangement | Expired / Lapsed | 1957-04-26 | 1959-08-25 | 0 | Details |
| US2898434A | Adjustable reference device | Expired / Lapsed | 1956-12-26 | 1959-08-04 | 0 | Details |
| US2898525A | Light responsive system | Expired / Lapsed | 1955-03-15 | 1959-08-04 | 0 | Details |
| US2898411A | Gain control circuit for semiconductor amplifiers | Expired / Lapsed | 1953-12-07 | 1959-08-04 | 0 | Details |
| US2897432A | Electrical signal regulator | Expired / Lapsed | 1957-05-17 | 1959-07-28 | 0 | Details |
| US2892334A | Combination washer and dryer | Expired / Lapsed | 1955-06-02 | 1959-06-30 | 0 | Details |
| US2892378A | Indicating turbidimeter | Expired / Lapsed | 1955-04-26 | 1959-06-30 | 0 | Details |
| US2889692A | Defrost evaporator structure | Expired / Lapsed | 1957-11-25 | 1959-06-09 | 0 | Details |
| US2890410A | Impulse testing | Expired / Lapsed | 1955-06-27 | 1959-06-09 | 0 | Details |
| US2889511A | Mechanical rectifier current and voltage control | Expired / Lapsed | 1954-04-19 | 1959-06-02 | 0 | Details |
| US2888023A | Hydraulic thrust bearing wear indicator and safety device | Expired / Lapsed | 1956-04-13 | 1959-05-26 | 0 | Details |
| US2888424A | Curable polyethylene composition comprising a peroxide cont… | Expired / Lapsed | 1955-05-18 | 1959-05-26 | 2 | Details |
| US2885613A | Binary comparator system for position control systems | Expired / Lapsed | 1958-03-26 | 1959-05-05 | 0 | Details |
| US2885562A | Photoelectric device | Expired / Lapsed | 1955-05-09 | 1959-05-05 | 1 | Details |
| US2881633A | Combination washer-dryer drive mechanism | Expired / Lapsed | 1956-07-19 | 1959-04-14 | 0 | Details |
| US2882462A | Semiconductor device | Expired / Lapsed | 1954-06-29 | 1959-04-14 | 0 | Details |
| US2878579A | Automatic clothes dryer control | Expired / Lapsed | 1954-08-17 | 1959-03-24 | 0 | Details |
| US2871330A | Silicon current controlling devices | Expired / Lapsed | 1954-12-22 | 1959-01-27 | 1 | Details |
| US2869699A | Two speed drive | Expired / Lapsed | 1956-12-12 | 1959-01-20 | 0 | Details |
| US2866376A | Optical flaw detection apparatus | Expired / Lapsed | 1954-09-29 | 1958-12-30 | 0 | Details |
| US2866153A | Three-dimension servosystem transducer | Expired / Lapsed | 1957-11-19 | 1958-12-23 | 0 | Details |
| US2866040A | Low-voltage current-limiting fuse | Expired / Lapsed | 1957-09-13 | 1958-12-23 | 0 | Details |
| US2866191A | Information indicating instrument | Expired / Lapsed | 1950-12-28 | 1958-12-23 | 0 | Details |
| US2864006A | Cooling structure for semiconductor devices | Expired / Lapsed | 1956-07-06 | 1958-12-09 | 0 | Details |
| US2864062A | Negative resistance using transistors | Expired / Lapsed | 1955-02-15 | 1958-12-09 | 0 | Details |
| US2863955A | Direct-coupled amplifiers | Expired / Lapsed | 1953-03-09 | 1958-12-09 | 0 | Details |
| US2863137A | Tape-spacing system | Expired / Lapsed | 1957-02-05 | 1958-12-02 | 0 | Details |
| US2863023A | Bimetallic strip thermally responsive device | Expired / Lapsed | 1956-01-27 | 1958-12-02 | 0 | Details |
| US2862194A | Electric protective equipment | Expired / Lapsed | 1956-11-30 | 1958-11-25 | 0 | Details |
| US2861226A | High current rectifier | Expired / Lapsed | 1956-03-22 | 1958-11-18 | 0 | Details |
| US2861230A | Calorized point contact electrode for semiconductor devices | Expired / Lapsed | 1953-11-24 | 1958-11-18 | 0 | Details |
| US2860219A | Silicon current controlling devices | Expired / Lapsed | 1954-09-07 | 1958-11-11 | 2 | Details |
| US2860218A | Germanium current controlling devices | Expired / Lapsed | 1954-02-04 | 1958-11-11 | 2 | Details |
| US2858435A | Signal processing arrangement | Expired / Lapsed | 1956-11-08 | 1958-10-28 | 0 | Details |
| US2856540A | Infrared detection apparatus | Expired / Lapsed | 1954-12-30 | 1958-10-14 | 1 | Details |
| US2855491A | Metal-ceramic electrical resistors | Expired / Lapsed | 1954-06-30 | 1958-10-07 | 2 | Details |
| US2853918A | High speed photographic device | Expired / Lapsed | 1956-02-16 | 1958-09-30 | 0 | Details |
| US2853654A | Lighting circuit current regulator | Expired / Lapsed | 1956-08-13 | 1958-09-23 | 0 | Details |
| US2851789A | Control system for clothes dryers | Expired / Lapsed | 1956-03-13 | 1958-09-16 | 0 | Details |
| US2851790A | Temperature control means for clothes dryer | Expired / Lapsed | 1955-11-25 | 1958-09-16 | 0 | Details |
| US2852772A | Receiver scanning system | Expired / Lapsed | 1949-08-04 | 1958-09-16 | 0 | Details |
| US2848670A | Automatic programming servomotor control system | Expired / Lapsed | 1954-12-30 | 1958-08-19 | 0 | Details |
| US2847343A | Ethoxyline resin compositions and their preparation | Expired / Lapsed | 1957-03-07 | 1958-08-12 | 2 | Details |
| US2844939A | Tube-bundle combustion chamber | Expired / Lapsed | 1954-10-04 | 1958-07-29 | 0 | Details |
| US2838733A | Phase detection | Expired / Lapsed | 1951-10-15 | 1958-06-10 | 0 | Details |
| US2836766A | Electroluminescent devices and circuits | Expired / Lapsed | 1956-05-15 | 1958-05-27 | 0 | Details |
| US2836186A | Washing apparatus with tub sealing system | Expired / Lapsed | 1955-12-14 | 1958-05-27 | 0 | Details |
| US2836797A | Multi-electrode field controlled germanium devices | Expired / Lapsed | 1953-03-23 | 1958-05-27 | 2 | Details |
| US2834903A | Electroluminescent lighting device | Expired / Lapsed | 1952-10-30 | 1958-05-13 | 2 | Details |
| US2833923A | Hunting a. f. c. system | Expired / Lapsed | 1955-10-13 | 1958-05-06 | 0 | Details |
| US2826696A | Double-base diode d. c.-a. c. (f.-m.) converter | Expired / Lapsed | 1956-08-30 | 1958-03-11 | 0 | Details |
| US2826388A | Shelf support | Expired / Lapsed | 1953-04-17 | 1958-03-11 | 0 | Details |
| US2824264A | Electrical capacitor assembly | Expired / Lapsed | 1956-09-13 | 1958-02-18 | 0 | Details |
| US2824286A | Scale compressing circuit | Expired / Lapsed | 1952-12-20 | 1958-02-18 | 0 | Details |
| US2823312A | Semiconductor network | Expired / Lapsed | 1955-01-26 | 1958-02-11 | 0 | Details |
| US2822455A | Electric heating apparatus | Expired / Lapsed | 1953-08-21 | 1958-02-04 | 0 | Details |
| US2820304A | Clothes drying machines | Expired / Lapsed | 1954-12-17 | 1958-01-21 | 0 | Details |
| US2819492A | Electrical capacitor and method of making the same | Expired / Lapsed | 1955-10-20 | 1958-01-14 | 2 | Details |
| US2819423A | Plasma transmitter | Expired / Lapsed | 1957-04-08 | 1958-01-07 | 0 | Details |
| US2815923A | Valve with automatic rate-of-flow control | Expired / Lapsed | 1952-07-23 | 1957-12-10 | 0 | Details |
| US2816271A | Microwave mode converter | Expired / Lapsed | 1950-11-22 | 1957-12-10 | 0 | Details |
| US2815472A | Rectifier unit | Expired / Lapsed | 1954-12-21 | 1957-12-03 | 0 | Details |
| US2815481A | Automatic rejection circuit for electrical testing apparatus | Expired / Lapsed | 1954-02-16 | 1957-12-03 | 0 | Details |
| US2813957A | Semi-conductor device | Expired / Lapsed | 1954-01-21 | 1957-11-19 | 2 | Details |
| US2811617A | Electric switch | Expired / Lapsed | 1955-09-19 | 1957-10-29 | 0 | Details |
| US2811601A | Latching relay | Expired / Lapsed | 1955-06-28 | 1957-10-29 | 0 | Details |
| US2811713A | Signal processing circuit | Expired / Lapsed | 1954-03-09 | 1957-10-29 | 0 | Details |
| US2809946A | Molding compositions containing mineral fillers and product… | Expired / Lapsed | 1954-11-10 | 1957-10-15 | 2 | Details |
| US2808203A | Binary shift register | Expired / Lapsed | 1952-02-28 | 1957-10-01 | 0 | Details |
| US2806983A | Remote base transistor | Expired / Lapsed | 1956-06-01 | 1957-09-17 | 2 | Details |
| US2803614A | Tin compound as a curing agent for organopolysiloxanes | Expired / Lapsed | 1954-03-15 | 1957-08-20 | 2 | Details |
| US2802897A | Insulated electrical conductors | Expired / Lapsed | 1952-07-18 | 1957-08-13 | 2 | Details |
| US2798966A | Surface inspection equipment | Expired / Lapsed | 1955-11-23 | 1957-07-09 | 0 | Details |
| US2797336A | Photoelectric flame detector | Expired / Lapsed | 1954-07-28 | 1957-06-25 | 0 | Details |
| US2797403A | Recording system | Expired / Lapsed | 1950-02-10 | 1957-06-25 | 0 | Details |
| US2796556A | Phase comparator | Expired / Lapsed | 1953-11-30 | 1957-06-18 | 0 | Details |
| US2795512A | Electrostatic method and apparatus for lining molds | Expired / Lapsed | 1953-08-28 | 1957-06-11 | 1 | Details |
| US2794076A | Transistor amplifiers | Expired / Lapsed | 1952-05-05 | 1957-05-28 | 0 | Details |
| US2792494A | Semiconductor superregenerative detector | Expired / Lapsed | 1955-01-31 | 1957-05-14 | 0 | Details |
| US2792272A | Metallic bond | Expired / Lapsed | 1954-10-22 | 1957-05-14 | 1 | Details |
| US2791931A | Non-contacting width gage | Expired / Lapsed | 1951-08-03 | 1957-05-14 | 0 | Details |
| US2792271A | Method of making electric discharge device | Expired / Lapsed | 1951-07-20 | 1957-05-14 | 0 | Details |
| US2791473A | Elapsed time indicator | Expired / Lapsed | 1955-01-31 | 1957-05-07 | 0 | Details |
| US2787707A | Pulse generators | Expired / Lapsed | 1953-06-16 | 1957-04-02 | 0 | Details |
| US2787727A | Electrical system | Expired / Lapsed | 1951-11-06 | 1957-04-02 | 0 | Details |
| US2786967A | Thyratron control circuit | Expired / Lapsed | 1953-07-17 | 1957-03-26 | 0 | Details |
| US2786966A | Thyratron control circuit | Expired / Lapsed | 1953-07-17 | 1957-03-26 | 0 | Details |
| US2783197A | Method of making broad area semiconductor devices | Expired / Lapsed | 1952-01-25 | 1957-02-26 | 2 | Details |
| US2783295A | Waveguide seal | Expired / Lapsed | 1952-01-18 | 1957-02-26 | 0 | Details |
| US2782327A | Dynamoelectric machine | Expired / Lapsed | 1954-10-27 | 1957-02-19 | 0 | Details |
| US2781054A | Self-operating check valve | Expired / Lapsed | 1952-09-23 | 1957-02-12 | 0 | Details |
| US2780752A | Semi-conductor network | Expired / Lapsed | 1954-06-16 | 1957-02-05 | 0 | Details |
| US2780569A | Method of making p-nu junction semiconductor units | Expired / Lapsed | 1952-08-20 | 1957-02-05 | 2 | Details |
| US2779899A | Time delay control system | Expired / Lapsed | 1954-07-01 | 1957-01-29 | 0 | Details |
| US2778980A | High power junction semiconductor device | Expired / Lapsed | 1954-08-30 | 1957-01-22 | 2 | Details |
| US2778212A | Water load responsive diaphragm operated control device for… | Expired / Lapsed | 1953-01-21 | 1957-01-22 | 0 | Details |
| US2777065A | Negative resistance oscillator | Expired / Lapsed | 1954-09-30 | 1957-01-08 | 0 | Details |
| US2776543A | Step-modulated control system for air conditioning apparatus | Expired / Lapsed | 1954-05-10 | 1957-01-08 | 0 | Details |
| US2777084A | Plastic electrode structure for electron tubes | Expired / Lapsed | 1952-04-12 | 1957-01-08 | 0 | Details |
| US2776357A | Photosensitive layer cell | Expired / Lapsed | 1955-04-04 | 1957-01-01 | 0 | Details |
| US2774004A | Flexible electroluminescent laminated panel | Expired / Lapsed | 1953-04-08 | 1956-12-11 | 0 | Details |
| US2771559A | Portable clock radio | Expired / Lapsed | 1956-01-25 | 1956-11-20 | 0 | Details |
| US2769949A | Method and apparatus for motor speed regulation | Expired / Lapsed | 1954-03-23 | 1956-11-06 | 0 | Details |
| US2769926A | Non-linear resistance device | Expired / Lapsed | 1953-03-09 | 1956-11-06 | 0 | Details |
| US2768345A | Magnetic amplifier circuit | Expired / Lapsed | 1950-03-01 | 1956-10-23 | 0 | Details |
| US2767295A | Control system for surface heating units | Expired / Lapsed | 1953-09-25 | 1956-10-16 | 0 | Details |
| US2767296A | Control system for surface heating units | Expired / Lapsed | 1953-09-25 | 1956-10-16 | 0 | Details |
| US2765405A | Voltage level switching network | Expired / Lapsed | 1952-03-12 | 1956-10-02 | 0 | Details |
| US2764720A | Follow-up control system | Expired / Lapsed | 1955-05-23 | 1956-09-25 | 0 | Details |
| US2764681A | Frequency stabilized and controlled oscillatory system | Expired / Lapsed | 1953-08-19 | 1956-09-25 | 0 | Details |
| US2764693A | Process and apparatus for image production and recordation | Expired / Lapsed | 1951-05-25 | 1956-09-25 | 0 | Details |
| US2762964A | Regulating control system | Expired / Lapsed | 1953-12-14 | 1956-09-11 | 0 | Details |
| US2760070A | Amplitude stabilized transistor oscillator circuit | Expired / Lapsed | 1955-02-04 | 1956-08-21 | 0 | Details |
| US2758273A | Voltage regulated power supply | Expired / Lapsed | 1953-10-16 | 1956-08-07 | 0 | Details |
| US2757105A | Ceramic coating for compressor blades, coated blades and me… | Expired / Lapsed | 1955-02-28 | 1956-07-31 | 1 | Details |
| US2757323A | Full wave asymmetrical semi-conductor devices | Expired / Lapsed | 1952-02-07 | 1956-07-31 | 2 | Details |
| US2756625A | Gun sighting mechanism having gyroscopically controlled tra… | Expired / Lapsed | 1949-05-04 | 1956-07-31 | 0 | Details |
| US2756353A | Bender-mode piezoelectric device and method of making the s… | Expired / Lapsed | 1950-04-10 | 1956-07-24 | 2 | Details |
| US2755422A | Record-reproduce programming control system for electric mo… | Expired / Lapsed | 1953-08-14 | 1956-07-17 | 0 | Details |
| US2755160A | Magnetic tape recording device | Expired / Lapsed | 1953-03-30 | 1956-07-17 | 0 | Details |
| CA527192A | Process of making porous metal bodies | Expired / Lapsed | — | 1956-07-03 | 0 | Details |
| US2752769A | Control circuits for automatic washing machines | Expired / Lapsed | 1952-11-14 | 1956-07-03 | 0 | Details |
| US2752553A | Magneto-responsive device control system | Expired / Lapsed | 1953-03-10 | 1956-06-26 | 0 | Details |
| US2752434A | Magneto-responsive device | Expired / Lapsed | 1952-03-22 | 1956-06-26 | 2 | Details |
| US2750453A | Direct current amplifier | Expired / Lapsed | 1952-11-06 | 1956-06-12 | 0 | Details |
| US2746834A | Recording device | Expired / Lapsed | 1953-09-17 | 1956-05-22 | 0 | Details |
| US2747104A | Interval timing apparatus | Expired / Lapsed | 1951-10-06 | 1956-05-22 | 0 | Details |
| US2745944A | Combined heating and thermosensitive heating control units | Expired / Lapsed | 1954-12-16 | 1956-05-15 | 0 | Details |
| US2745044A | Asymmetrically conductive apparatus | Expired / Lapsed | 1951-09-15 | 1956-05-08 | 2 | Details |
| US2744218A | Sealed rectifier unit and method of making the same | Expired / Lapsed | 1954-12-21 | 1956-05-01 | 0 | Details |
| US2744200A | Multiple masked photocell structure | Expired / Lapsed | 1952-03-07 | 1956-05-01 | 0 | Details |
| US2742151A | Automatic container inspection equipment | Expired / Lapsed | 1954-03-19 | 1956-04-17 | 0 | Details |
| US2738644A | Surge control for axial flow compressors | Expired / Lapsed | 1950-04-15 | 1956-03-20 | 0 | Details |
| US2736822A | Hall effect apparatus | Expired / Lapsed | 1952-05-09 | 1956-02-28 | 2 | Details |
| US2731713A | Method of making a focused multicell | Expired / Lapsed | 1951-11-23 | 1956-01-24 | 0 | Details |
| US2730899A | Dynamic balancing apparatus | Expired / Lapsed | 1952-08-19 | 1956-01-17 | 0 | Details |
| US2730663A | Unilaterally conductive device | Expired / Lapsed | 1953-03-20 | 1956-01-10 | 0 | Details |
| US2730689A | Electric terminal connector | Expired / Lapsed | 1951-12-26 | 1956-01-10 | 0 | Details |
| US2729696A | Three conductor rip cord | Expired / Lapsed | 1955-06-29 | 1956-01-03 | 0 | Details |
| US2729757A | Ferroelectric ceramic composition and method of making same | Expired / Lapsed | 1951-06-09 | 1956-01-03 | 1 | Details |
| US2728265A | Photoelectric measuring instrument | Expired / Lapsed | 1952-05-07 | 1955-12-27 | 0 | Details |
| US2727975A | Electric heating apparatus | Expired / Lapsed | 1953-12-14 | 1955-12-20 | 0 | Details |
| US2727209A | Precision time interval measuring system | Expired / Lapsed | 1949-11-19 | 1955-12-13 | 0 | Details |
| US2726312A | Thermal control system | Expired / Lapsed | 1952-01-17 | 1955-12-06 | 0 | Details |
| US2725433A | Cyclic program timer | Expired / Lapsed | 1952-03-28 | 1955-11-29 | 0 | Details |
| US2724270A | Flowmeter | Expired / Lapsed | 1954-04-28 | 1955-11-22 | 0 | Details |
| US2724247A | Multi-purpose air conditioner | Expired / Lapsed | 1953-09-22 | 1955-11-22 | 0 | Details |
| US2722659A | Testing device | Expired / Lapsed | 1954-08-31 | 1955-11-01 | 0 | Details |
| US2722574A | Switch | Expired / Lapsed | 1952-05-31 | 1955-11-01 | 0 | Details |
| US2721950A | Electroluminescent cell | Expired / Lapsed | 1952-08-09 | 1955-10-25 | 2 | Details |
| US2721701A | Quality monitoring apparatus | Expired / Lapsed | 1951-11-13 | 1955-10-25 | 0 | Details |
| US2720111A | Force measuring electric gauge | Expired / Lapsed | 1953-02-20 | 1955-10-11 | 0 | Details |
| US2719426A | Apparatus for measuring gas pressure in sealed vessels | Expired / Lapsed | 1952-04-23 | 1955-10-04 | 0 | Details |
| US2719937A | Cathode preheat conversion unit for fluorescent lamps | Expired / Lapsed | 1949-11-23 | 1955-10-04 | 0 | Details |
| US2719258A | Fast response rectifier circuit | Expired / Lapsed | 1954-10-13 | 1955-09-27 | 0 | Details |
| US2718544A | Jacketed multiple conductor cable | Expired / Lapsed | 1950-09-09 | 1955-09-20 | 0 | Details |
| US2717945A | Resistance temperature detector | Expired / Lapsed | 1954-03-30 | 1955-09-13 | 0 | Details |
| US2717343A | P-n junction transistor | Expired / Lapsed | 1954-06-25 | 1955-09-06 | 0 | Details |
| US2717132A | Automatic approach system | Expired / Lapsed | 1953-01-07 | 1955-09-06 | 0 | Details |
| US2714310A | Mass rate flowmeter | Expired / Lapsed | 1951-12-06 | 1955-08-02 | 0 | Details |
| US2714183A | Semi-conductor p-n junction units and method of making the … | Expired / Lapsed | 1952-12-29 | 1955-07-26 | 2 | Details |
| US2713697A | Molding machine | Expired / Lapsed | 1949-07-27 | 1955-07-26 | 2 | Details |
| US2713250A | Control for reversible refrigeration systems | Expired / Lapsed | 1954-01-29 | 1955-07-19 | 0 | Details |
| US2711399A | Silicone rubber with preaged carbon black | Expired / Lapsed | 1952-02-06 | 1955-06-21 | 2 | Details |
| US2711382A | Method of forming and applying metal heat exchange fins | Expired / Lapsed | 1951-02-08 | 1955-06-21 | 0 | Details |
| US2709421A | Hydraulic amplifier | Expired / Lapsed | 1952-07-29 | 1955-05-31 | 0 | Details |
| US2707837A | Clothes drier | Expired / Lapsed | 1951-02-03 | 1955-05-10 | 0 | Details |
| US2707177A | Ethoxyline-triallyl cyanurate resinous compositions | Expired / Lapsed | 1952-11-29 | 1955-04-26 | 2 | Details |
| US2707275A | Temperature responsive control device | Expired / Lapsed | 1951-11-24 | 1955-04-26 | 0 | Details |
| US2705767A | P-n junction transistor | Expired / Lapsed | 1952-11-18 | 1955-04-05 | 0 | Details |
| US2705404A | Cooling arrangement for condenser of refrigerating system | Expired / Lapsed | 1952-05-08 | 1955-04-05 | 0 | Details |
| US2701329A | Load frequency control telemetering system | Expired / Lapsed | 1953-11-25 | 1955-02-01 | 0 | Details |
| US2701336A | Flaw detector | Expired / Lapsed | 1951-09-15 | 1955-02-01 | 0 | Details |
| US2701352A | Navigation apparatus | Expired / Lapsed | 1943-07-13 | 1955-02-01 | 0 | Details |
| US2700759A | Monitoring apparatus | Expired / Lapsed | 1951-08-11 | 1955-01-25 | 0 | Details |
| US2700212A | Electrical conductor | Expired / Lapsed | 1948-10-15 | 1955-01-25 | 2 | Details |
| US2698915A | Phosphor screen | Expired / Lapsed | 1953-04-28 | 1955-01-04 | 0 | Details |
| US2697549A | Electronic multiradix counter of matrix type | Expired / Lapsed | 1950-03-18 | 1954-12-21 | 0 | Details |
| US2693022A | Method of manufacturing whisker electrodes | Expired / Lapsed | 1950-10-06 | 1954-11-02 | 0 | Details |
| US2692727A | Apparatus for digital computation | Expired / Lapsed | 1949-08-27 | 1954-10-26 | 0 | Details |
| US2692370A | Optical system for oscillographs | Expired / Lapsed | 1950-06-27 | 1954-10-19 | 0 | Details |
| US2691147A | Terminal block | Expired / Lapsed | 1951-04-02 | 1954-10-05 | 0 | Details |
| US2689930A | Semiconductor current control device | Expired / Lapsed | 1952-12-30 | 1954-09-21 | 0 | Details |
| US2683866A | Piezoelectric crystal protective device | Expired / Lapsed | 1945-10-01 | 1954-07-13 | 0 | Details |
| US2682002A | Transformerless voltage multiplier circuits | Expired / Lapsed | 1952-07-25 | 1954-06-22 | 0 | Details |
| US2679620A | Line follower | Expired / Lapsed | 1952-04-30 | 1954-05-25 | 0 | Details |
| US2674917A | Noncontacting width gauge | Expired / Lapsed | 1951-03-06 | 1954-04-13 | 0 | Details |
| US2669902A | Binocular optical system | Expired / Lapsed | 1950-09-26 | 1954-02-23 | 0 | Details |
| US2669786A | Attitude indicator | Expired / Lapsed | 1946-09-17 | 1954-02-23 | 0 | Details |
| US2669632A | Bus duct switch | Expired / Lapsed | 1949-04-16 | 1954-02-16 | 0 | Details |
| US2668923A | Current collector | Expired / Lapsed | 1951-07-14 | 1954-02-09 | 0 | Details |
| US2668883A | Amplifier for attenuating the higher frequency components o… | Expired / Lapsed | 1950-06-10 | 1954-02-09 | 0 | Details |
| US2668262A | Asymmetrically conductive device | Expired / Lapsed | 1950-09-27 | 1954-02-02 | 0 | Details |
| US2667464A | Insulation for electrical conductors | Expired / Lapsed | 1951-10-30 | 1954-01-26 | 1 | Details |
| US2667432A | Metalized ceramic | Expired / Lapsed | 1949-01-21 | 1954-01-26 | 2 | Details |
| US2666575A | Calculating device | Expired / Lapsed | 1949-10-26 | 1954-01-19 | 0 | Details |
| US2666181A | Phase modulation system | Expired / Lapsed | 1949-08-31 | 1954-01-12 | 0 | Details |
| US2665558A | Two-temperature refrigeration system | Expired / Lapsed | 1946-08-23 | 1954-01-12 | 0 | Details |
| US2664530A | Autopilot control system | Expired / Lapsed | 1948-07-17 | 1953-12-29 | 0 | Details |
| US2659679A | Phosphor coating process | Expired / Lapsed | 1951-11-23 | 1953-11-17 | 2 | Details |
| US2657580A | Multirange resistance thermometer | Expired / Lapsed | 1951-11-02 | 1953-11-03 | 0 | Details |
| US2657150A | Method and masking shield for interiorly coating hollow art… | Expired / Lapsed | 1948-05-18 | 1953-10-27 | 2 | Details |
| US2656500A | Electronic motor control system | Expired / Lapsed | 1952-02-15 | 1953-10-20 | 0 | Details |
| US2656101A | Arbitrary function generator | Expired / Lapsed | 1951-04-26 | 1953-10-20 | 0 | Details |
| US2655639A | Electrical connector with insulation piercing means contact… | Expired / Lapsed | 1951-12-29 | 1953-10-13 | 0 | Details |
| US2652812A | Combined manual and automatic hydraulic servomotor apparatus | Expired / Lapsed | 1952-05-13 | 1953-09-22 | 0 | Details |
| US2653254A | Nonlinear resonant flip-flop circuit | Expired / Lapsed | 1952-04-23 | 1953-09-22 | 0 | Details |
| US2653249A | System and apparatus for the formation of optical images | Expired / Lapsed | 1950-11-30 | 1953-09-22 | 0 | Details |
| US2653309A | Object detection | Expired / Lapsed | 1950-03-09 | 1953-09-22 | 0 | Details |
| US2652555A | Wheel slip protective system | Expired / Lapsed | 1952-11-28 | 1953-09-15 | 0 | Details |
| US2652501A | Binary magnetic system | Expired / Lapsed | 1952-08-08 | 1953-09-15 | 0 | Details |
| US2652520A | Composite sintered metal powder article | Expired / Lapsed | 1949-12-24 | 1953-09-15 | 1 | Details |
| US2651704A | Temperature responsive system | Expired / Lapsed | 1951-09-24 | 1953-09-08 | 0 | Details |
| US2651718A | Switching device | Expired / Lapsed | 1951-09-19 | 1953-09-08 | 0 | Details |
| US2651007A | Electronic apparatus and method of mounting | Expired / Lapsed | 1945-10-01 | 1953-09-01 | 0 | Details |
| US2650310A | X-ray image intensification and method | Expired / Lapsed | 1952-10-10 | 1953-08-25 | 0 | Details |
| US2649101A | Double-wall portable shelter | Expired / Lapsed | 1952-04-09 | 1953-08-18 | 0 | Details |
| US2648249A | Frequency modulated photometer | Expired / Lapsed | 1948-02-28 | 1953-08-11 | 0 | Details |
| US2647033A | Spark stylus recording apparatus | Expired / Lapsed | 1952-06-11 | 1953-07-28 | 0 | Details |
| US2644852A | Germanium photocell | Expired / Lapsed | 1951-10-19 | 1953-07-07 | 2 | Details |
| US2644738A | Recording device | Expired / Lapsed | 1951-03-22 | 1953-07-07 | 0 | Details |
| US2644245A | Clothes drier | Expired / Lapsed | 1949-02-10 | 1953-07-07 | 0 | Details |
| US2643851A | Turbo-machine rotor with cooling means | Expired / Lapsed | 1948-05-27 | 1953-06-30 | 0 | Details |
| US2641696A | Binary numbers comparator | Expired / Lapsed | 1950-01-18 | 1953-06-09 | 0 | Details |
| US2639209A | Recording apparatus | Expired / Lapsed | 1949-09-29 | 1953-05-19 | 0 | Details |
| US2635140A | Frequency-interlace television system | Expired / Lapsed | 1950-07-28 | 1953-04-14 | 0 | Details |
| US2633457A | Basing cement | Expired / Lapsed | 1949-03-19 | 1953-03-31 | 2 | Details |
| US2631188A | Electrical testing apparatus | Expired / Lapsed | 1949-10-06 | 1953-03-10 | 0 | Details |
| US2630969A | Decimal counting and indicating system | Expired / Lapsed | 1949-03-05 | 1953-03-10 | 0 | Details |
| US2629922A | Method of brazing resistor terminals | Expired / Lapsed | 1950-04-27 | 1953-03-03 | 0 | Details |
| US2628995A | Time delay means for controlling fluid pressure in electric… | Expired / Lapsed | 1948-10-30 | 1953-02-17 | 0 | Details |
| US2625662A | Signal discriminator | Expired / Lapsed | 1950-12-30 | 1953-01-13 | 0 | Details |
| US2625017A | Refrigerator air circulation control | Expired / Lapsed | 1950-12-12 | 1953-01-13 | 0 | Details |
| US2625603A | Television pulse separation circuit | Expired / Lapsed | 1950-08-11 | 1953-01-13 | 0 | Details |
| US2624819A | Snap action switch | Expired / Lapsed | 1951-01-10 | 1953-01-06 | 0 | Details |
| US2623976A | Automatic electric range control | Expired / Lapsed | 1949-12-24 | 1952-12-30 | 0 | Details |
| US2623087A | Fabricated terminal board | Expired / Lapsed | 1949-12-09 | 1952-12-23 | 0 | Details |
| US2622393A | Fuel regulating apparatus for aircraft gas turbine power pl… | Expired / Lapsed | 1945-07-19 | 1952-12-23 | 0 | Details |
| US2622023A | Titanium-base alloys | Expired / Lapsed | 1951-12-29 | 1952-12-16 | 2 | Details |
| US2621676A | Hydraulic pilot valve with reaction compensating means | Expired / Lapsed | 1950-11-16 | 1952-12-16 | 0 | Details |
| US2621672A | Liquid actuated prime mover regulating system with viscosit… | Expired / Lapsed | 1947-10-01 | 1952-12-16 | 0 | Details |
| US2620966A | Liquid piston gas pump | Expired / Lapsed | 1950-03-08 | 1952-12-09 | 0 | Details |
| DE857984C | Electrical resistance and process for its manufacture | Expired / Lapsed | 1950-07-19 | 1952-12-04 | 0 | Details |
| US2620449A | Dynamoelectric machine | Expired / Lapsed | 1951-01-18 | 1952-12-02 | 0 | Details |
| US2620405A | Magnetic recorder | Expired / Lapsed | 1950-03-28 | 1952-12-02 | 0 | Details |
| US2619573A | Temperature detector and lead assembly construction | Expired / Lapsed | 1952-01-30 | 1952-11-25 | 0 | Details |
| US2619068A | Illuminated multiscale dial structure | Expired / Lapsed | 1949-09-08 | 1952-11-25 | 0 | Details |
| US2617093A | Radio apparatus for indicating speed and course of objects | Expired / Lapsed | 1946-04-05 | 1952-11-04 | 0 | Details |
| US2615950A | Electric terminal connector | Expired / Lapsed | 1950-02-01 | 1952-10-28 | 0 | Details |
| US2615816A | Glass solder | Expired / Lapsed | 1949-11-10 | 1952-10-28 | 2 | Details |
| US2615658A | Stabilization system in aircraft autopilot | Expired / Lapsed | 1948-07-17 | 1952-10-28 | 0 | Details |
| US2615154A | Automatic steering system | Expired / Lapsed | 1950-09-02 | 1952-10-21 | 0 | Details |
| US2613504A | Compound turbine power plant with intercept valve | Expired / Lapsed | 1951-06-05 | 1952-10-14 | 0 | Details |
| US2612550A | Voltage level selector circuit | Expired / Lapsed | 1950-09-27 | 1952-09-30 | 0 | Details |
| US2611854A | Control circuit with temperature and/or humidity compensati… | Expired / Lapsed | 1949-12-20 | 1952-09-23 | 0 | Details |
| US2611531A | Two-lamp wrapper | Expired / Lapsed | 1949-02-25 | 1952-09-23 | 0 | Details |
| US2611861A | Amplitude comparison circuit | Expired / Lapsed | 1948-11-26 | 1952-09-23 | 0 | Details |
| US2611025A | Selective signal transmission system | Expired / Lapsed | 1951-08-01 | 1952-09-16 | 0 | Details |
| US2610102A | Function recorder | Expired / Lapsed | 1950-12-27 | 1952-09-09 | 0 | Details |
| US2610228A | Marker signal generator | Expired / Lapsed | 1949-09-02 | 1952-09-09 | 0 | Details |
| US2609835A | Adjustable magnetic pressure valve | Expired / Lapsed | 1948-12-27 | 1952-09-09 | 0 | Details |
| US2609470A | Resistance materials and elements | Expired / Lapsed | 1949-07-22 | 1952-09-02 | 2 | Details |
| US2605671A | Spectrophotometer | Expired / Lapsed | 1948-02-28 | 1952-08-05 | 0 | Details |
| US2606092A | Sensitive moving chart graphic recorder | Expired / Lapsed | 1947-12-20 | 1952-08-05 | 0 | Details |
| US2602368A | Color matching apparatus | Expired / Lapsed | 1950-09-13 | 1952-07-08 | 0 | Details |
| US2602140A | Coincidence timing system | Expired / Lapsed | 1950-03-24 | 1952-07-01 | 0 | Details |
| US2598370A | Balanced phase detector | Expired / Lapsed | 1949-04-16 | 1952-05-27 | 0 | Details |
| US2598432A | Phase shifting network | Expired / Lapsed | 1949-03-29 | 1952-05-27 | 0 | Details |
| US2597617A | Method of depositing and impervious metal film on a granula… | Expired / Lapsed | 1946-11-09 | 1952-05-20 | 2 | Details |
| US2596118A | Recording device | Expired / Lapsed | 1949-08-20 | 1952-05-13 | 0 | Details |
| US2596752A | Magnetostriction measuring instrument | Expired / Lapsed | 1949-01-29 | 1952-05-13 | 0 | Details |
| US2595755A | Electromagnet | Expired / Lapsed | 1949-05-24 | 1952-05-06 | 0 | Details |
| US2594939A | Hall effect converter construction | Expired / Lapsed | 1950-06-06 | 1952-04-29 | 0 | Details |
| US2594887A | Electromechanical trigonometric converter | Expired / Lapsed | 1949-04-21 | 1952-04-29 | 0 | Details |
| US2594979A | Resinous compositions and their use | Expired / Lapsed | 1949-01-19 | 1952-04-29 | 2 | Details |
| US2594838A | Molded tubular body | Expired / Lapsed | 1947-03-04 | 1952-04-29 | 0 | Details |
| US2594971A | Barrier nonreflectant to incident electromagnetic waves | Expired / Lapsed | 1945-03-09 | 1952-04-29 | 0 | Details |
| US2592342A | Wheel slip protective device | Expired / Lapsed | 1951-07-18 | 1952-04-08 | 0 | Details |
| US2592322A | Rocket motor pumped supersonic wind tunnel | Expired / Lapsed | 1948-09-02 | 1952-04-08 | 0 | Details |
| US2591438A | Portable radio receiver | Expired / Lapsed | 1948-04-13 | 1952-04-01 | 0 | Details |
| US2590853A | Liquid fuel metering and spraying system | Expired / Lapsed | 1945-10-16 | 1952-04-01 | 0 | Details |
| US2590808A | Control system for laundry driers and the like | Expired / Lapsed | 1950-08-02 | 1952-03-25 | 0 | Details |
| US2590061A | Industrial liquid cooler automatic liquid level control | Expired / Lapsed | 1949-09-01 | 1952-03-18 | 0 | Details |
| US2588926A | Temperature responsive control circuit | Expired / Lapsed | 1951-02-01 | 1952-03-11 | 0 | Details |
| US2588094A | Continuous wave detection system | Expired / Lapsed | 1949-09-08 | 1952-03-04 | 0 | Details |
| US2587331A | High-frequency electrical heating method and apparatus | Expired / Lapsed | 1947-08-08 | 1952-02-26 | 0 | Details |
| US2586402A | Starting and operating circuits and devices for electric di… | Expired / Lapsed | 1948-05-20 | 1952-02-19 | 0 | Details |
| US2586539A | Metal rectifier assembly | Expired / Lapsed | 1947-09-04 | 1952-02-19 | 0 | Details |
| US2585024A | Temperature compensated floated gyroscope | Expired / Lapsed | 1949-12-22 | 1952-02-12 | 0 | Details |
| US2584680A | Automatic testing apparatus | Expired / Lapsed | 1949-04-16 | 1952-02-05 | 0 | Details |
| US2584728A | Electronic relay | Expired / Lapsed | 1946-12-31 | 1952-02-05 | 0 | Details |
| US2582305A | Airplane maneuvering system | Expired / Lapsed | 1948-07-17 | 1952-01-15 | 0 | Details |
| US2582088A | Two-stage hydraulic amplifier | Expired / Lapsed | 1947-11-01 | 1952-01-08 | 0 | Details |
| US2581212A | Electrically heated fabric | Expired / Lapsed | 1949-05-04 | 1952-01-01 | 0 | Details |
| US2581196A | Electronic relay arrangement for protecting power systems | Expired / Lapsed | 1948-10-14 | 1952-01-01 | 0 | Details |
| US2579329A | Trimethylol phenol compound and derivatives thereof | Expired / Lapsed | 1949-10-18 | 1951-12-18 | 2 | Details |
| US2577104A | Drier safety control | Expired / Lapsed | 1950-05-16 | 1951-12-04 | 0 | Details |
| US2576665A | Air circulating arrangement for refrigerators | Expired / Lapsed | 1949-12-08 | 1951-11-27 | 0 | Details |
| US2575756A | Exhaust machine | Expired / Lapsed | 1949-10-21 | 1951-11-20 | 0 | Details |
| US2575904A | Electric chopper circuit | Expired / Lapsed | 1949-09-16 | 1951-11-20 | 0 | Details |
| US2575906A | Adjustable magnetic pressure valve | Expired / Lapsed | 1948-12-27 | 1951-11-20 | 0 | Details |
| US2575086A | Magnetic valve | Expired / Lapsed | 1947-02-14 | 1951-11-13 | 0 | Details |
| US2574373A | Electric valve control circuit | Expired / Lapsed | 1946-07-22 | 1951-11-06 | 0 | Details |
| US2573523A | Feedback amplifier | Expired / Lapsed | 1946-06-24 | 1951-10-30 | 0 | Details |
| US2570248A | Method of metalizing and bonding nonmetallic bodies | Expired / Lapsed | 1948-06-30 | 1951-10-09 | 2 | Details |
| US2570786A | Method of making dynamoelectric machine windings | Expired / Lapsed | 1948-05-29 | 1951-10-09 | 0 | Details |
| US2570129A | Supersonic wind tunnel | Expired / Lapsed | 1948-08-18 | 1951-10-02 | 0 | Details |
| US2569317A | Control system | Expired / Lapsed | 1949-12-30 | 1951-09-25 | 0 | Details |
| US2568449A | Electronic counter | Expired / Lapsed | 1947-12-05 | 1951-09-18 | 0 | Details |
| US2568448A | Parallax correction in color television | Expired / Lapsed | 1947-09-23 | 1951-09-18 | 0 | Details |
| US2567719A | Suspension of vinyl chloride polymer in polymerizable liquid | Expired / Lapsed | 1948-03-18 | 1951-09-11 | 2 | Details |
| US2565478A | Temperature responsive control circuits | Expired / Lapsed | 1949-05-04 | 1951-08-28 | 0 | Details |
| US2566051A | Control valve | Expired / Lapsed | 1947-05-23 | 1951-08-28 | 0 | Details |
| US2566064A | Cabinet construction | Expired / Lapsed | 1946-10-21 | 1951-08-28 | 0 | Details |
| US2565323A | Annunciator alarm system | Expired / Lapsed | 1950-06-24 | 1951-08-21 | 0 | Details |
| US2565331A | Wide angle sweep yoke assembly | Expired / Lapsed | 1950-03-22 | 1951-08-21 | 0 | Details |
| US2565316A | Method of using dilatable sealing elements | Expired / Lapsed | 1946-08-17 | 1951-08-21 | 0 | Details |
| US2561257A | Control for automatic washing machines | Expired / Lapsed | 1946-01-08 | 1951-07-17 | 0 | Details |
| US2558563A | Piezoelectric strain gauge | Expired / Lapsed | 1948-10-29 | 1951-06-26 | 0 | Details |
| US2556864A | Coated grid for electron discharge tubes | Expired / Lapsed | 1950-09-27 | 1951-06-12 | 0 | Details |
| US2555977A | Moisture content monitor | Expired / Lapsed | 1950-02-08 | 1951-06-05 | 0 | Details |
| US2555992A | Motor control system | Expired / Lapsed | 1950-02-03 | 1951-06-05 | 0 | Details |
| US2555978A | Air discharge register | Expired / Lapsed | 1949-02-19 | 1951-06-05 | 0 | Details |
| US2555017A | Electrode holder for gas blanketed electric arc weldings | Expired / Lapsed | 1949-08-18 | 1951-05-29 | 0 | Details |
| US2554172A | Linear sweep wave generator | Expired / Lapsed | 1948-03-06 | 1951-05-22 | 0 | Details |
| US2553294A | Ratio circuit | Expired / Lapsed | 1945-12-29 | 1951-05-15 | 0 | Details |
| US2552206A | Thyratron control system for series motors | Expired / Lapsed | 1948-10-21 | 1951-05-08 | 0 | Details |
| US2551291A | Electric voltage, current, and phaseangle measuring instrum… | Expired / Lapsed | 1946-12-17 | 1951-05-01 | 0 | Details |
| US2550492A | Hall effect alternating current measuring apparatus | Expired / Lapsed | 1950-05-27 | 1951-04-24 | 0 | Details |
| US2550506A | Automatic selective switching equipment | Expired / Lapsed | 1950-05-09 | 1951-04-24 | 0 | Details |
| US2548855A | Phase shifting apparatus | Expired / Lapsed | 1946-12-11 | 1951-04-17 | 0 | Details |
| US2548590A | Noncontacting width gauge | Expired / Lapsed | 1950-04-01 | 1951-04-10 | 0 | Details |
| US2548592A | Resistance strain gauge and method for making same | Expired / Lapsed | 1949-08-26 | 1951-04-10 | 0 | Details |
| US2548581A | Magnetic switching device | Expired / Lapsed | 1949-03-04 | 1951-04-10 | 0 | Details |
| US2547625A | Temperature measuring apparatus | Expired / Lapsed | 1946-07-16 | 1951-04-03 | 0 | Details |
| US2546783A | Speed control system for direct-current motors | Expired / Lapsed | 1948-10-12 | 1951-03-27 | 0 | Details |
| US2545909A | Apparatus for applying emission material to cathodes | Expired / Lapsed | 1948-12-22 | 1951-03-20 | 0 | Details |
| US2546039A | Regulating system | Expired / Lapsed | 1946-04-06 | 1951-03-20 | 0 | Details |
| US2545369A | Hall effect frequency meter | Expired / Lapsed | 1949-03-09 | 1951-03-13 | 0 | Details |
| US2543630A | X-ray monochromator | Expired / Lapsed | 1950-04-12 | 1951-02-27 | 0 | Details |
| US2543622A | Traction vehicle wheel slip control system | Expired / Lapsed | 1949-08-18 | 1951-02-27 | 0 | Details |
| US2543640A | Phase comparator utilizing hall effect | Expired / Lapsed | 1949-05-25 | 1951-02-27 | 0 | Details |
| US2542638A | Frequency responsive apparatus | Expired / Lapsed | 1949-03-29 | 1951-02-20 | 0 | Details |
| US2542311A | Photographic spotlight having a flash tube and a modeling l… | Expired / Lapsed | 1946-07-06 | 1951-02-20 | 0 | Details |
| US2541832A | Electric current rectifier | Expired / Lapsed | 1949-07-22 | 1951-02-13 | 2 | Details |
| US2539818A | Frequency modulation detector | Expired / Lapsed | 1948-10-28 | 1951-01-30 | 0 | Details |
| US2539218A | Temperature compensating system for oscillators | Expired / Lapsed | 1949-06-21 | 1951-01-23 | 0 | Details |
| US2538642A | Thermopile flame detector for combustion devices | Expired / Lapsed | 1949-08-31 | 1951-01-16 | 0 | Details |
| US2537767A | Phase shifting control circuit | Expired / Lapsed | 1948-09-25 | 1951-01-09 | 0 | Details |
| US2536805A | Hall effect telemetering transmitter | Expired / Lapsed | 1947-08-16 | 1951-01-02 | 0 | Details |
| US2534119A | High-potential coil | Expired / Lapsed | 1948-01-26 | 1950-12-12 | 0 | Details |
| US2532816A | Air circulating arrangement for refrigerators | Expired / Lapsed | 1949-11-16 | 1950-12-05 | 0 | Details |
| US2531153A | Traffic signal control system | Expired / Lapsed | 1949-12-29 | 1950-11-21 | 0 | Details |
| US2531122A | Frequency responsive protective arrangement for ultra high … | Expired / Lapsed | 1945-08-06 | 1950-11-21 | 0 | Details |
| US2530003A | Electric control device | Expired / Lapsed | 1947-02-21 | 1950-11-14 | 0 | Details |
| US2528243A | Electric control element | Expired / Lapsed | 1949-10-12 | 1950-10-31 | 0 | Details |
| US2528222A | Combination television and frequency modulation receiver | Expired / Lapsed | 1948-12-29 | 1950-10-31 | 0 | Details |
| US2528235A | Coating and impregnating compositions and articles produced… | Expired / Lapsed | 1945-06-26 | 1950-10-31 | 2 | Details |
| US2528248A | Wide band flexible section for wave guides | Expired / Lapsed | 1945-02-14 | 1950-10-31 | 0 | Details |
| US2526379A | Defrosting arrangement for refrigerating systems | Expired / Lapsed | 1949-03-09 | 1950-10-17 | 0 | Details |
| US2525445A | Photometer | Expired / Lapsed | 1949-11-10 | 1950-10-10 | 0 | Details |
| US2525022A | Circular lighting fixture | Expired / Lapsed | 1946-10-23 | 1950-10-10 | 0 | Details |
| US2524522A | Flexible hose of extrudable elastomeric composition | Expired / Lapsed | 1948-08-24 | 1950-10-03 | 0 | Details |
| US2523328A | Cathode-ray mapping system | Expired / Lapsed | 1948-06-30 | 1950-09-26 | 0 | Details |
| US2523027A | Method and apparatus for effecting electric power transform… | Expired / Lapsed | 1950-01-20 | 1950-09-19 | 0 | Details |
| US2523043A | Frequency modulation receiver system | Expired / Lapsed | 1948-03-27 | 1950-09-19 | 0 | Details |
| US2522240A | Antihunt feedback generator for recorders | Expired / Lapsed | 1947-07-23 | 1950-09-12 | 0 | Details |
| US2521513A | Stationary induction apparatus | Expired / Lapsed | 1948-08-18 | 1950-09-05 | 0 | Details |
| US2521528A | Elastic hydrocarbon-substituted polysiloxanes and tertiary … | Expired / Lapsed | 1947-07-24 | 1950-09-05 | 2 | Details |
| US2519083A | Time division pulse multiplex system | Expired / Lapsed | 1949-08-08 | 1950-08-15 | 0 | Details |
| US2519030A | Mixer circuit | Expired / Lapsed | 1946-10-29 | 1950-08-15 | 0 | Details |
| US2518115A | Amplification system for noncontacting thickness gauges | Expired / Lapsed | 1949-03-10 | 1950-08-08 | 0 | Details |
| US2518160A | Curing of hydrocarbon-substituted polysiloxane resins with … | Expired / Lapsed | 1947-09-18 | 1950-08-08 | 1 | Details |
| US2518149A | Flowmeter | Expired / Lapsed | 1946-11-15 | 1950-08-08 | 0 | Details |
| US2518118A | Electronic control circuits | Expired / Lapsed | 1944-09-12 | 1950-08-08 | 0 | Details |
| US2516563A | Magnetic amplifier for inductive loads | Expired / Lapsed | 1948-04-19 | 1950-07-25 | 0 | Details |
| US2516567A | Vertical shaft motor | Expired / Lapsed | 1945-12-15 | 1950-07-25 | 0 | Details |
| US2515763A | Direct current restoration circuit for television | Expired / Lapsed | 1948-10-22 | 1950-07-18 | 0 | Details |
| US2512325A | Hall effect commutating apparatus | Expired / Lapsed | 1949-05-25 | 1950-06-20 | 0 | Details |
| US2509730A | Synchronizing system | Expired / Lapsed | 1946-05-01 | 1950-05-30 | 0 | Details |
| US2509017A | Magnetic recording apparatus | Expired / Lapsed | 1945-03-21 | 1950-05-23 | 0 | Details |
| US2507225A | Wide band antenna structure | Expired / Lapsed | 1946-04-11 | 1950-05-09 | 0 | Details |
| US2507211A | Pulse receiver circuit | Expired / Lapsed | 1942-12-24 | 1950-05-09 | 0 | Details |
| US2506384A | Measuring circuits | Expired / Lapsed | 1949-02-03 | 1950-05-02 | 0 | Details |
| US2506368A | Vehicole actuated traffic controller | Expired / Lapsed | 1946-12-24 | 1950-05-02 | 0 | Details |
| US2505565A | Control circuit | Expired / Lapsed | 1946-11-14 | 1950-04-25 | 0 | Details |
| US2505577A | Vane controlled oscillator | Expired / Lapsed | 1946-08-15 | 1950-04-25 | 0 | Details |
| US2505521A | Age indicating device for electrical apparatus | Expired / Lapsed | 1944-03-01 | 1950-04-25 | 0 | Details |
| US2505534A | Device for controlling the propagation of energy in a wave … | Expired / Lapsed | 1943-04-27 | 1950-04-25 | 0 | Details |
| US2504772A | Electrical detector of vapors and the like | Expired / Lapsed | 1947-07-08 | 1950-04-18 | 0 | Details |
| US2504549A | Starting and operating circuit for electric discharge devic… | Expired / Lapsed | 1947-02-28 | 1950-04-18 | 0 | Details |
| US2504744A | Glass fiber sheet material | Expired / Lapsed | 1944-06-03 | 1950-04-18 | 0 | Details |
| US2503023A | Photoelectric motion transmitting device | Expired / Lapsed | 1947-10-21 | 1950-04-04 | 0 | Details |
| US2503062A | X-ray absorption photometer | Expired / Lapsed | 1946-11-14 | 1950-04-04 | 0 | Details |
| US2501543A | Frequency regulating system | Expired / Lapsed | 1947-11-29 | 1950-03-21 | 0 | Details |
| US2500752A | High-frequency dielectric heating in a resonant chamber | Expired / Lapsed | 1946-06-01 | 1950-03-14 | 0 | Details |
| US2499977A | Method of forming grid-like structures | Expired / Lapsed | 1945-11-14 | 1950-03-07 | 0 | Details |
| US2499178A | Curve follower | Expired / Lapsed | 1948-11-18 | 1950-02-28 | 0 | Details |
| US2497691A | Limiting amplifier system | Expired / Lapsed | 1948-01-16 | 1950-02-14 | 0 | Details |
| US2497670A | High-frequency heating and compression apparatus | Expired / Lapsed | 1946-06-01 | 1950-02-14 | 0 | Details |
| US2495916A | Remote control receiver | Expired / Lapsed | 1944-10-07 | 1950-01-31 | 0 | Details |
| US2495917A | Remote-control system | Expired / Lapsed | 1944-10-07 | 1950-01-31 | 0 | Details |
| US2495115A | Keyed oscillator circuit | Expired / Lapsed | 1943-11-30 | 1950-01-17 | 0 | Details |
| US2493745A | Method of making electrical indicators of mechanical expans… | Expired / Lapsed | 1947-11-05 | 1950-01-10 | 0 | Details |
| US2494352A | Electronic interval timer | Expired / Lapsed | 1945-02-28 | 1950-01-10 | 0 | Details |
| US2494339A | Noise-reducing pulse-echo locating equipment | Expired / Lapsed | 1943-07-21 | 1950-01-10 | 0 | Details |
| US2492736A | Pulse length modulation system | Expired / Lapsed | 1949-02-26 | 1949-12-27 | 0 | Details |
| US2492769A | Receptacle mounting and closure fastener | Expired / Lapsed | 1949-02-16 | 1949-12-27 | 0 | Details |
| US2492768A | Cloud moisture meter | Expired / Lapsed | 1947-09-18 | 1949-12-27 | 0 | Details |
| US2492731A | Tracer control system | Expired / Lapsed | 1944-08-14 | 1949-12-27 | 0 | Details |
| US2491848A | Method of manufacturing a glass blank | Expired / Lapsed | 1947-08-01 | 1949-12-20 | 0 | Details |
| US2489920A | Metal detector | Expired / Lapsed | 1946-07-03 | 1949-11-29 | 0 | Details |
| US2488269A | Noncontacting thickness gauge | Expired / Lapsed | 1948-06-19 | 1949-11-15 | 0 | Details |
| US2488277A | Magnetic wire footage meter | Expired / Lapsed | 1948-06-15 | 1949-11-15 | 0 | Details |
| US2487603A | Circuits for comparing electrical quantities | Expired / Lapsed | 1947-04-11 | 1949-11-08 | 0 | Details |
| US2485621A | Washing machine | Expired / Lapsed | 1944-08-25 | 1949-10-25 | 0 | Details |
| US2485395A | Pulse generating circuit | Expired / Lapsed | 1945-04-11 | 1949-10-18 | 0 | Details |
| US2484585A | Thermal responsive resistance device | Expired / Lapsed | 1948-12-02 | 1949-10-11 | 0 | Details |
| US2484575A | Phase controled switching system | Expired / Lapsed | 1943-03-20 | 1949-10-11 | 0 | Details |
| US2483940A | Method of making lead-in seals | Expired / Lapsed | 1946-12-03 | 1949-10-04 | 0 | Details |
| US2483140A | Cathode-ray oscillographic apparatus | Expired / Lapsed | 1948-11-02 | 1949-09-27 | 0 | Details |
| US2483126A | Delay timer | Expired / Lapsed | 1946-04-10 | 1949-09-27 | 0 | Details |
| US2482553A | Electronic relay | Expired / Lapsed | 1946-05-10 | 1949-09-20 | 0 | Details |
| US2481368A | Starting switch for fluorescent lamps | Expired / Lapsed | 1947-10-04 | 1949-09-06 | 0 | Details |
| US2480535A | Enclosure for vibratile elements | Expired / Lapsed | 1947-03-13 | 1949-08-30 | 0 | Details |
| US2479573A | Gas turbine power plant | Expired / Lapsed | 1943-10-20 | 1949-08-23 | 0 | Details |
| US2479400A | Method of forming coil assemblies | Expired / Lapsed | 1948-06-15 | 1949-08-16 | 0 | Details |
| US2479319A | Control for electric blankets or the like | Expired / Lapsed | 1947-07-12 | 1949-08-16 | 0 | Details |
| US2479426A | Impulse testing | Expired / Lapsed | 1945-11-30 | 1949-08-16 | 0 | Details |
| US2479305A | Selective carrier off noise suppression circuit | Expired / Lapsed | 1945-04-25 | 1949-08-16 | 0 | Details |
| US2477966A | Electric lamp signaling apparatus | Expired / Lapsed | 1948-02-11 | 1949-08-02 | 0 | Details |
| US2478018A | Apparatus for continuously sheathing cores of material | Expired / Lapsed | 1946-10-29 | 1949-08-02 | 0 | Details |
| US2476025A | Precision frequency meter | Expired / Lapsed | 1945-06-09 | 1949-07-12 | 0 | Details |
| US2471160A | Combination balanced shutoff and throttling valve assembly | Expired / Lapsed | 1948-03-30 | 1949-05-24 | 0 | Details |
| US2471138A | Radio communication system | Expired / Lapsed | 1946-08-16 | 1949-05-24 | 0 | Details |
| US2470479A | Process for making polysiloxane resins | Expired / Lapsed | 1945-11-21 | 1949-05-17 | 0 | Details |
| US2469206A | X-ray absorption photometer | Expired / Lapsed | 1946-11-14 | 1949-05-03 | 0 | Details |
| US2468554A | Apparatus for magnetic field investigation | Expired / Lapsed | 1943-03-19 | 1949-04-26 | 0 | Details |
| US2467812A | Noncontacting thickness gauge | Expired / Lapsed | 1947-04-01 | 1949-04-19 | 0 | Details |
| US2467844A | Means for measuring the difference in magnitude of alternat… | Expired / Lapsed | 1946-03-26 | 1949-04-19 | 0 | Details |
| US2467856A | Control system | Expired / Lapsed | 1945-10-31 | 1949-04-19 | 0 | Details |
| US2467857A | Adjustable delay line | Expired / Lapsed | 1943-08-12 | 1949-04-19 | 0 | Details |
| US2467831A | Sighting mechanism | Expired / Lapsed | 1942-09-26 | 1949-04-19 | 0 | Details |
| US2464807A | Hall effect converter | Expired / Lapsed | 1947-08-16 | 1949-03-22 | 0 | Details |
| US2465059A | Pulse starting circuit for electric discharge devices | Expired / Lapsed | 1947-08-13 | 1949-03-22 | 0 | Details |
| US2464568A | Electrical coil insulated with thermoplastic particles and … | Expired / Lapsed | 1945-05-14 | 1949-03-15 | 0 | Details |
| US2464565A | Disconnecting device | Expired / Lapsed | 1945-02-08 | 1949-03-15 | 0 | Details |
| US2464629A | Maneuvering automatic control | Expired / Lapsed | 1945-01-01 | 1949-03-15 | 0 | Details |
| US2463318A | Electronic time delay circuit | Expired / Lapsed | 1944-08-05 | 1949-03-01 | 0 | Details |
| US2462336A | Electric discharge device and method of operation | Expired / Lapsed | 1946-04-10 | 1949-02-22 | 0 | Details |
| US2462624A | Voltage regulating system | Expired / Lapsed | 1945-05-18 | 1949-02-22 | 0 | Details |
| US2461998A | Pulse echo system and pulse indicating means | Expired / Lapsed | 1943-11-17 | 1949-02-15 | 0 | Details |
| US2461303A | Grid structure for electric discharge devices | Expired / Lapsed | 1948-03-09 | 1949-02-08 | 0 | Details |
| US2461261A | Overload protection device for power transmission apparatus | Expired / Lapsed | 1947-01-27 | 1949-02-08 | 0 | Details |
| US2460153A | Piezoelectric crystal holder | Expired / Lapsed | 1946-07-30 | 1949-01-25 | 0 | Details |
| US2459852A | Trigger network | Expired / Lapsed | 1945-06-08 | 1949-01-25 | 0 | Details |
| US2460142A | Electronic calibrating means for indicating instruments in … | Expired / Lapsed | 1945-01-30 | 1949-01-25 | 0 | Details |
| US2458511A | Combined switch stud and fuse clip | Expired / Lapsed | 1945-06-06 | 1949-01-11 | 0 | Details |
| US2458288A | Piezoelectric crystal holder | Expired / Lapsed | 1946-12-24 | 1949-01-04 | 0 | Details |
| US2456952A | Sensitivity time control | Expired / Lapsed | 1946-05-03 | 1948-12-21 | 0 | Details |
| US2456916A | Electric blanket control | Expired / Lapsed | 1946-01-09 | 1948-12-21 | 0 | Details |
| US2456859A | Electric discharge apparatus | Expired / Lapsed | 1944-03-29 | 1948-12-21 | 0 | Details |
| US2456420A | Electronic direct-current control system | Expired / Lapsed | 1946-08-31 | 1948-12-14 | 0 | Details |
| US2456427A | Protective system for electric motors | Expired / Lapsed | 1944-11-28 | 1948-12-14 | 0 | Details |
| US2456381A | Electric capacitor | Expired / Lapsed | 1944-07-29 | 1948-12-14 | 0 | Details |
| US2456463A | Motor protective device | Expired / Lapsed | 1943-11-23 | 1948-12-14 | 0 | Details |
| US2455875A | Inductance unit | Expired / Lapsed | 1944-07-10 | 1948-12-07 | 0 | Details |
| US2454966A | Heated stylus inkless recorder | Expired / Lapsed | 1947-02-14 | 1948-11-30 | 0 | Details |
| US2455265A | Pulse radar system | Expired / Lapsed | 1943-04-09 | 1948-11-30 | 0 | Details |
| US2453524A | Centrifugal compressor | Expired / Lapsed | 1945-03-31 | 1948-11-09 | 0 | Details |
| US2452951A | Crystal oscillator circuits | Expired / Lapsed | 1943-04-27 | 1948-11-02 | 0 | Details |
| US2452349A | Directive radio antenna | Expired / Lapsed | 1942-12-24 | 1948-10-26 | 0 | Details |
| US2451816A | Web break detector | Expired / Lapsed | 1946-08-31 | 1948-10-19 | 0 | Details |
| US2451858A | Controlled frequency oscillator | Expired / Lapsed | 1945-01-26 | 1948-10-19 | 0 | Details |
| US2451830A | Starting arrangement for electric discharge devices | Expired / Lapsed | 1944-11-21 | 1948-10-19 | 0 | Details |
| US2451835A | Supercharger control system | Expired / Lapsed | 1942-01-28 | 1948-10-19 | 0 | Details |
| US2451219A | Dynamoelectric machine | Expired / Lapsed | 1947-05-28 | 1948-10-12 | 0 | Details |
| US2449572A | Polysiloxane resins | Expired / Lapsed | 1944-08-11 | 1948-09-21 | 0 | Details |
| US2449391A | Bidirectional selective remote control system | Expired / Lapsed | 1948-01-21 | 1948-09-14 | 0 | Details |
| US2449528A | Copolymers of monovinylphenoxthines and method of preparing… | Expired / Lapsed | 1947-05-29 | 1948-09-14 | 0 | Details |
| US2448556A | Synthetic elastic and elastomeric products | Expired / Lapsed | 1947-01-16 | 1948-09-07 | 0 | Details |
| US2448389A | Fuse unit | Expired / Lapsed | 1945-06-02 | 1948-08-31 | 0 | Details |
| US2447880A | Magnetometer | Expired / Lapsed | 1945-08-24 | 1948-08-24 | 0 | Details |
| US2446810A | Electric blanket and control therefor | Expired / Lapsed | 1947-10-01 | 1948-08-10 | 0 | Details |
| US2446826A | Magnetron | Expired / Lapsed | 1943-04-14 | 1948-08-10 | 0 | Details |
| US2446429A | Cellular phenolic resin | Expired / Lapsed | 1944-10-20 | 1948-08-03 | 0 | Details |
| US2446024A | Directive radio system | Expired / Lapsed | 1943-03-13 | 1948-07-27 | 0 | Details |
| US2445587A | Electric terminal and coil | Expired / Lapsed | 1945-05-10 | 1948-07-20 | 0 | Details |
| US2445584A | Pulse receiving system | Expired / Lapsed | 1942-04-13 | 1948-07-20 | 0 | Details |
| US2445678A | Electric discharge device | Expired / Lapsed | 1942-02-12 | 1948-07-20 | 0 | Details |
| US2444794A | Voltage stabilizing system | Expired / Lapsed | 1945-02-13 | 1948-07-06 | 0 | Details |
| US2444767A | Gas-arc welding apparatus | Expired / Lapsed | 1944-05-29 | 1948-07-06 | 0 | Details |
| US2444782A | Pulse generating circuits | Expired / Lapsed | 1942-10-31 | 1948-07-06 | 0 | Details |
| US2444261A | Control system | Expired / Lapsed | 1947-02-21 | 1948-06-29 | 0 | Details |
| US2443722A | Multiple image optical system | Expired / Lapsed | 1945-11-30 | 1948-06-22 | 0 | Details |
| US2443488A | Pulsed network | Expired / Lapsed | 1945-05-18 | 1948-06-15 | 0 | Details |
| US2443452A | Switching means | Expired / Lapsed | 1943-11-17 | 1948-06-15 | 0 | Details |
| US2443030A | Picture size control circuit for television receivers | Expired / Lapsed | 1946-11-09 | 1948-06-08 | 0 | Details |
| US2442586A | Straight-line recording mechanism | Expired / Lapsed | 1946-09-28 | 1948-06-01 | 0 | Details |
| US2442212A | Method of preparing organosilicon resin | Expired / Lapsed | 1945-10-19 | 1948-05-25 | 0 | Details |
| US2441792A | Stacked electrode assembly for electron discharge devices | Expired / Lapsed | 1944-10-04 | 1948-05-18 | 0 | Details |
| US2441789A | Electromagnetic switching system aided by space-discharge d… | Expired / Lapsed | 1944-06-28 | 1948-05-18 | 0 | Details |
| US2441423A | Alkylsilicon sols and gels | Expired / Lapsed | 1945-02-10 | 1948-05-11 | 0 | Details |
| US2441422A | Organosilicon-silica sols, gels, and aerogels | Expired / Lapsed | 1945-02-10 | 1948-05-11 | 0 | Details |
| US2440980A | Turbine oil system with pump priming arrangement | Expired / Lapsed | 1946-04-23 | 1948-05-04 | 0 | Details |
| US2440547A | Pulse generator | Expired / Lapsed | 1944-04-12 | 1948-04-27 | 0 | Details |
| US2438735A | High-frequency wave transmitting apparatus | Expired / Lapsed | 1944-10-02 | 1948-03-30 | 0 | Details |
| US2438367A | Transmitter-receiver switching system | Expired / Lapsed | 1942-10-24 | 1948-03-23 | 0 | Details |
| US2437951A | Follow-up control | Expired / Lapsed | 1943-03-01 | 1948-03-16 | 0 | Details |
| US2436663A | Saw-tooth wave generator | Expired / Lapsed | 1944-11-15 | 1948-02-24 | 0 | Details |
| US2436662A | Pulse generator | Expired / Lapsed | 1944-09-02 | 1948-02-24 | 0 | Details |
| US2436224A | Differential electromagnet having snap action | Expired / Lapsed | 1944-08-29 | 1948-02-17 | 0 | Details |
| US2435819A | Aircraft cabin pressure control arrangement | Expired / Lapsed | 1944-03-20 | 1948-02-10 | 0 | Details |
| US2435442A | Tuning arrangement for concentric transmission line resonat… | Expired / Lapsed | 1943-12-23 | 1948-02-03 | 0 | Details |
| US2433667A | Time measuring apparatus | Expired / Lapsed | 1943-12-29 | 1947-12-30 | 0 | Details |
| US2432272A | Control mechanism for washing machines | Expired / Lapsed | 1945-07-13 | 1947-12-09 | 0 | Details |
| US2432330A | Locating equipment | Expired / Lapsed | 1944-02-18 | 1947-12-09 | 0 | Details |
| US2432399A | Electrical control device | Expired / Lapsed | 1935-04-24 | 1947-12-09 | 0 | Details |
| US2431952A | Pulse generating circuit | Expired / Lapsed | 1944-06-07 | 1947-12-02 | 0 | Details |
| US2431575A | Screen brightness measurement photometer | Expired / Lapsed | 1946-03-18 | 1947-11-25 | 0 | Details |
| US2429819A | High-frequency heating apparatus | Expired / Lapsed | 1944-03-28 | 1947-10-28 | 0 | Details |
| US2429453A | Bridge control for electric blankets | Expired / Lapsed | 1946-03-21 | 1947-10-21 | 0 | Details |
| US2429415A | Circuit for electric discharge devices | Expired / Lapsed | 1945-06-07 | 1947-10-21 | 0 | Details |
| US2429475A | Control device for heater circuits | Expired / Lapsed | 1945-04-12 | 1947-10-21 | 0 | Details |
| US2428888A | High-frequency electric discharge device | Expired / Lapsed | 1946-04-15 | 1947-10-14 | 0 | Details |
| US2428788A | Interpolymerization products | Expired / Lapsed | 1939-10-31 | 1947-10-14 | 0 | Details |
| US2428613A | Transformer | Expired / Lapsed | 1943-10-18 | 1947-10-07 | 0 | Details |
| US2427752A | Concentric line lamp for measuring high-frequency power | Expired / Lapsed | 1943-09-02 | 1947-09-23 | 0 | Details |
| US2427688A | Electrical translation apparatus | Expired / Lapsed | 1943-06-12 | 1947-09-23 | 0 | Details |
| US2427213A | Linear motion transmitter or receiver | Expired / Lapsed | 1945-10-12 | 1947-09-09 | 0 | Details |
| US2427180A | Telemetering system | Expired / Lapsed | 1945-09-21 | 1947-09-09 | 0 | Details |
| US2427244A | Gas turbine | Expired / Lapsed | 1944-03-07 | 1947-09-09 | 0 | Details |
| US2425605A | Selsyn controlled electric motor system | Expired / Lapsed | 1935-10-01 | 1947-08-12 | 0 | Details |
| US2424830A | Frequency modulation | Expired / Lapsed | 1944-05-30 | 1947-07-29 | 0 | Details |
| US2424853A | Titanium dioxide dielectric materials | Expired / Lapsed | 1944-05-06 | 1947-07-29 | 0 | Details |
| US2424527A | Electric switch | Expired / Lapsed | 1946-08-10 | 1947-07-22 | 0 | Details |
| US2424436A | Pipe coupling | Expired / Lapsed | 1945-04-13 | 1947-07-22 | 0 | Details |
| US2424111A | Ceramic products | Expired / Lapsed | 1943-07-27 | 1947-07-15 | 0 | Details |
| US2423830A | Cathode-ray screen having contrasting colors and unlike rat… | Expired / Lapsed | 1943-03-25 | 1947-07-15 | 0 | Details |
| US2423716A | Ultra high frequency magnetron of the resonator type | Expired / Lapsed | 1943-03-20 | 1947-07-08 | 0 | Details |
| US2423304A | Pulse producing system | Expired / Lapsed | 1944-02-15 | 1947-07-01 | 0 | Details |
| US2422943A | Electron microscope | Expired / Lapsed | 1944-02-01 | 1947-06-24 | 0 | Details |
| US2422457A | Coating apparatus | Expired / Lapsed | 1944-08-10 | 1947-06-17 | 0 | Details |
| US2422189A | Dielectric wave guide system | Expired / Lapsed | 1944-01-22 | 1947-06-17 | 0 | Details |
| US2422040A | Magnetic drive | Expired / Lapsed | 1945-01-27 | 1947-06-10 | 0 | Details |
| US2422058A | Wave guide system | Expired / Lapsed | 1943-08-16 | 1947-06-10 | 0 | Details |
| US2421626A | Torque measurement | Expired / Lapsed | 1945-07-02 | 1947-06-03 | 0 | Details |
| US2420516A | Pulse producing system | Expired / Lapsed | 1944-06-15 | 1947-05-13 | 0 | Details |
| US2419904A | Carrier current protective relaying system | Expired / Lapsed | 1945-08-21 | 1947-04-29 | 0 | Details |
| US2419564A | Radio transmitter-receiver switching system | Expired / Lapsed | 1943-06-10 | 1947-04-29 | 0 | Details |
| US2419466A | Electronic converter | Expired / Lapsed | 1944-06-12 | 1947-04-22 | 0 | Details |
| US2419459A | Photoelectric detecting apparatus | Expired / Lapsed | 1944-02-01 | 1947-04-22 | 0 | Details |
| US2419072A | Electric switch | Expired / Lapsed | 1945-06-08 | 1947-04-15 | 0 | Details |
| US2418810A | Contact element | Expired / Lapsed | 1943-10-08 | 1947-04-15 | 0 | Details |
| US2418707A | Lubricant seal | Expired / Lapsed | 1944-05-27 | 1947-04-08 | 0 | Details |
| US2417834A | Self-pulsing oscillator | Expired / Lapsed | 1943-02-19 | 1947-03-25 | 0 | Details |
| US2417689A | Gyroscopic device | Expired / Lapsed | 1943-07-12 | 1947-03-18 | 0 | Details |
| US2416895A | Pulse signalling system | Expired / Lapsed | 1942-10-02 | 1947-03-04 | 0 | Details |
| US2416158A | Frequency dividing apparatus | Expired / Lapsed | 1942-10-09 | 1947-02-18 | 0 | Details |
| US2416089A | Selective pulse amplifier system | Expired / Lapsed | 1942-06-26 | 1947-02-18 | 0 | Details |
| US2416088A | Pulse system | Expired / Lapsed | 1942-06-01 | 1947-02-18 | 0 | Details |
| US2414936A | Follow-up control system | Expired / Lapsed | 1944-05-25 | 1947-01-28 | 0 | Details |
| US2414128A | Compass transmitter | Expired / Lapsed | 1945-07-30 | 1947-01-14 | 0 | Details |
| US2414323A | Cathode-ray apparatus | Expired / Lapsed | 1942-09-28 | 1947-01-14 | 0 | Details |
| US2413442A | Electrode activation | Expired / Lapsed | 1944-01-28 | 1946-12-31 | 0 | Details |
| US2412851A | Dynamoelectric machine and method of making the same | Expired / Lapsed | 1945-04-03 | 1946-12-17 | 0 | Details |
| US2412824A | Magnetron | Expired / Lapsed | 1942-06-22 | 1946-12-17 | 0 | Details |
| US2412612A | Directive radio system | Expired / Lapsed | 1941-10-08 | 1946-12-17 | 0 | Details |
| US2412470A | Production of water-repellent materials | Expired / Lapsed | 1943-02-22 | 1946-12-10 | 0 | Details |
| US2412446A | Ultra high frequency system | Expired / Lapsed | 1942-10-31 | 1946-12-10 | 0 | Details |
| US2412071A | Cabin supercharging means having automatic pressure and tem… | Expired / Lapsed | 1944-07-22 | 1946-12-03 | 0 | Details |
| US2412064A | Saw-tooth wave generator | Expired / Lapsed | 1942-10-22 | 1946-12-03 | 0 | Details |
| US2412161A | Transmission system | Expired / Lapsed | 1941-12-01 | 1946-12-03 | 0 | Details |
| US2411742A | Electric valve system | Expired / Lapsed | 1942-09-01 | 1946-11-26 | 0 | Details |
| US2411706A | Phase inverter circuit | Expired / Lapsed | 1942-06-03 | 1946-11-26 | 0 | Details |
| US2411741A | Color matching apparatus | Expired / Lapsed | 1939-12-13 | 1946-11-26 | 0 | Details |
| US2411423A | Phase shifting circuit | Expired / Lapsed | 1944-05-09 | 1946-11-19 | 0 | Details |
| US2411065A | Speed governing mechanism | Expired / Lapsed | 1944-08-07 | 1946-11-12 | 0 | Details |
| US2409837A | Centrifugal type compressor | Expired / Lapsed | 1944-04-21 | 1946-10-22 | 0 | Details |
| US2409913A | Wave guide structure | Expired / Lapsed | 1944-02-14 | 1946-10-22 | 0 | Details |
| US2409004A | Multicircuit connector | Expired / Lapsed | 1942-11-19 | 1946-10-08 | 0 | Details |
| US2408822A | Electrical discharge device | Expired / Lapsed | 1942-07-30 | 1946-10-08 | 0 | Details |
| US2409030A | Light-impulse system | Expired / Lapsed | 1941-12-22 | 1946-10-08 | 0 | Details |
| US2408055A | Ultra high frequency coupling device and system | Expired / Lapsed | 1944-07-17 | 1946-09-24 | 0 | Details |
| US2407505A | Electric discharge device circuit | Expired / Lapsed | 1942-04-04 | 1946-09-10 | 0 | Details |
| US2407479A | Interpolymerization products | Expired / Lapsed | 1939-10-31 | 1946-09-10 | 0 | Details |
| US2406621A | Method of preparing polysiloxane resins | Expired / Lapsed | 1944-02-12 | 1946-08-27 | 0 | Details |
| US2406635A | Method for amplifying highfrequency signals | Expired / Lapsed | 1942-03-27 | 1946-08-27 | 0 | Details |
| US2406277A | High-frequency electric discharge device | Expired / Lapsed | 1942-11-13 | 1946-08-20 | 0 | Details |
| US2405048A | Centrifugal compressor | Expired / Lapsed | 1944-11-18 | 1946-07-30 | 0 | Details |
| US2405041A | Preparation of methyl polysiloxane resins | Expired / Lapsed | 1944-05-19 | 1946-07-30 | 0 | Details |
| US2405071A | Pulse generating system | Expired / Lapsed | 1943-10-01 | 1946-07-30 | 0 | Details |
| US2405070A | Square wave pulse generating system | Expired / Lapsed | 1942-02-23 | 1946-07-30 | 0 | Details |
| US2405069A | Pulse generating system | Expired / Lapsed | 1942-02-23 | 1946-07-30 | 0 | Details |
| US2404643A | Electronic electroresponsive apparatus | Expired / Lapsed | 1943-03-20 | 1946-07-23 | 0 | Details |
| US2404626A | Noise limiting circuit | Expired / Lapsed | 1942-10-05 | 1946-07-23 | 0 | Details |
| US2404227A | Electromagnetic control apparatus | Expired / Lapsed | 1943-01-08 | 1946-07-16 | 0 | Details |
| US2404212A | Magnetron | Expired / Lapsed | 1942-12-24 | 1946-07-16 | 0 | Details |
| US2402928A | Synchronous motion transmission system | Expired / Lapsed | 1944-03-10 | 1946-06-25 | 0 | Details |
| US2401421A | Control system | Expired / Lapsed | 1944-10-30 | 1946-06-04 | 0 | Details |
| US2400335A | Refrigerating system | Expired / Lapsed | 1944-06-29 | 1946-05-14 | 0 | Details |
| US2400334A | Refrigerating system | Expired / Lapsed | 1944-06-29 | 1946-05-14 | 0 | Details |
| US2399955A | Oscilloscope wave expansion | Expired / Lapsed | 1942-06-30 | 1946-05-07 | 0 | Details |
| US2399469A | Secret signaling system | Expired / Lapsed | 1940-07-31 | 1946-04-30 | 0 | Details |
| US2399017A | Locating equipment | Expired / Lapsed | 1943-07-26 | 1946-04-23 | 0 | Details |
| US2399023A | Ignition distributor | Expired / Lapsed | 1942-11-23 | 1946-04-23 | 0 | Details |
| US2397540A | Ratio circuit | Expired / Lapsed | 1943-09-21 | 1946-04-02 | 0 | Details |
| US2394786A | Carrier current control system | Expired / Lapsed | 1942-10-24 | 1946-02-12 | 0 | Details |
| US2394546A | Aluminum base alloy containing copper and beryllium and met… | Expired / Lapsed | 1942-03-28 | 1946-02-12 | 0 | Details |
| US2394072A | Electron accelerator control system | Expired / Lapsed | 1943-09-10 | 1946-02-05 | 0 | Details |
| US2394393A | Frequency modulation transmitter | Expired / Lapsed | 1943-05-26 | 1946-02-05 | 0 | Details |
| US2394389A | Pulse generating circuit | Expired / Lapsed | 1943-02-12 | 1946-02-05 | 0 | Details |
| US2394060A | Cabinet for electrical apparatus | Expired / Lapsed | 1942-11-13 | 1946-02-05 | 0 | Details |
| US2393585A | Power boost | Expired / Lapsed | 1944-12-14 | 1946-01-29 | 0 | Details |
| US2393186A | Instrument-reading register and printer | Expired / Lapsed | 1942-11-12 | 1946-01-15 | 0 | Details |
| US2392713A | Process of preparing dimethyl silicone elastomers | Expired / Lapsed | 1944-07-01 | 1946-01-08 | 0 | Details |
| US2392632A | Frequency difference measurement | Expired / Lapsed | 1944-06-17 | 1946-01-08 | 0 | Details |
| US2392664A | Ultra high frequency filter | Expired / Lapsed | 1943-12-23 | 1946-01-08 | 0 | Details |
| US2392114A | Pulse system | Expired / Lapsed | 1943-01-23 | 1946-01-01 | 0 | Details |
| US2391742A | Synthetic rubber compositions | Expired / Lapsed | 1943-04-01 | 1945-12-25 | 0 | Details |
| US2390344A | Electric switch | Expired / Lapsed | 1944-03-01 | 1945-12-04 | 0 | Details |
| US2388951A | Snap-acting device | Expired / Lapsed | 1944-11-24 | 1945-11-13 | 0 | Details |
| US2388295A | Mutual coupling | Expired / Lapsed | 1943-07-02 | 1945-11-06 | 0 | Details |
| US2388555A | Automatic pattern controlled machine tool | Expired / Lapsed | 1943-05-07 | 1945-11-06 | 0 | Details |
| US2387562A | Condition control system | Expired / Lapsed | 1942-12-07 | 1945-10-23 | 0 | Details |
| US2386060A | Fuse unit | Expired / Lapsed | 1942-10-29 | 1945-10-02 | 0 | Details |
| US2385664A | Cabin supercharger arrangements | Expired / Lapsed | 1941-08-19 | 1945-09-25 | 0 | Details |
| US2385214A | Electric control circuit | Expired / Lapsed | 1943-09-17 | 1945-09-18 | 0 | Details |
| US2383823A | Electric resistor | Expired / Lapsed | 1943-06-15 | 1945-08-28 | 0 | Details |
| US2383827A | Process of preparing silicone resins | Expired / Lapsed | 1943-02-01 | 1945-08-28 | 0 | Details |
| US2383291A | Heat control device | Expired / Lapsed | 1942-08-28 | 1945-08-21 | 0 | Details |
| US2381366A | Organo-dihalogenosiloxanes | Expired / Lapsed | 1942-10-29 | 1945-08-07 | 0 | Details |
| US2380996A | Preparation of organosilicon halides | Expired / Lapsed | 1941-09-26 | 1945-08-07 | 0 | Details |
| US2381527A | Protective apparatus | Expired / Lapsed | 1941-07-31 | 1945-08-07 | 0 | Details |
| US2380732A | Washing machine | Expired / Lapsed | 1941-04-30 | 1945-07-31 | 0 | Details |
| US2379716A | Magnetic field gradient meter | Expired / Lapsed | 1943-09-16 | 1945-07-03 | 0 | Details |
| US2379286A | Refrigerating system | Expired / Lapsed | 1943-05-24 | 1945-06-26 | 0 | Details |
| US2379318A | High-frequency transmission line | Expired / Lapsed | 1942-07-22 | 1945-06-26 | 0 | Details |
| US2377757A | Short time interval meter | Expired / Lapsed | 1943-12-01 | 1945-06-05 | 0 | Details |
| US2376653A | Laminated structure | Expired / Lapsed | 1942-03-31 | 1945-05-22 | 0 | Details |
| US2376725A | End seal for transmission lines | Expired / Lapsed | 1942-02-28 | 1945-05-22 | 0 | Details |
| US2376156A | Pressure gauge | Expired / Lapsed | 1944-02-07 | 1945-05-15 | 0 | Details |
| US2376219A | Fabrication of quartz resonators | Expired / Lapsed | 1944-01-28 | 1945-05-15 | 0 | Details |
| US2375722A | Carrier-current control system | Expired / Lapsed | 1942-09-15 | 1945-05-08 | 0 | Details |
| US2374708A | Control system for aircraft turbosuperchargers | Expired / Lapsed | 1942-07-25 | 1945-05-01 | 0 | Details |
| US2374588A | Hydraulic torque transmission arrangement | Expired / Lapsed | 1942-08-22 | 1945-04-24 | 0 | Details |
| US2374315A | Starting control for electric discharge devices | Expired / Lapsed | 1942-05-07 | 1945-04-24 | 0 | Details |
| US2374310A | Method of producing solids of desired configuration | Expired / Lapsed | 1941-06-27 | 1945-04-24 | 0 | Details |
| US2373549A | Method of removing cations from liquid media | Expired / Lapsed | 1942-10-15 | 1945-04-10 | 0 | Details |
| US2371511A | Magnetic transmission | Expired / Lapsed | 1943-02-23 | 1945-03-13 | 0 | Details |
| US2370178A | Electric valve circuit | Expired / Lapsed | 1942-06-29 | 1945-02-27 | 0 | Details |
| US2370287A | Electric valve circuit | Expired / Lapsed | 1942-06-29 | 1945-02-27 | 0 | Details |
| US2370526A | Hydraulic torque transmission arrangement | Expired / Lapsed | 1942-02-20 | 1945-02-27 | 0 | Details |
| US2369966A | Smoke detector | Expired / Lapsed | 1943-06-17 | 1945-02-20 | 0 | Details |
| US2369066A | Amplifier | Expired / Lapsed | 1943-12-29 | 1945-02-06 | 0 | Details |
| US2368485A | Motor controller | Expired / Lapsed | 1942-12-01 | 1945-01-30 | 0 | Details |
| US2368505A | Spacer for electrical windings | Expired / Lapsed | 1942-05-05 | 1945-01-30 | 0 | Details |
| US2368609A | Electroacoustic transducer | Expired / Lapsed | 1941-06-07 | 1945-01-30 | 0 | Details |
| US2368451A | Polyaminotriazine-formaldehyde resin modified with a prefor… | Expired / Lapsed | 1940-11-15 | 1945-01-30 | 0 | Details |
| US2368449A | Expander circuit for oscilloscopes | Expired / Lapsed | 1940-08-03 | 1945-01-30 | 0 | Details |
| US2367331A | Cathode construction | Expired / Lapsed | 1941-12-08 | 1945-01-16 | 0 | Details |
| US2366577A | Electric regulating and control system | Expired / Lapsed | 1942-05-26 | 1945-01-02 | 0 | Details |
| US2366537A | Electric control circuit | Expired / Lapsed | 1942-04-23 | 1945-01-02 | 0 | Details |
| US2366060A | Electric valve time-delay relay | Expired / Lapsed | 1942-11-24 | 1944-12-26 | 0 | Details |
| US2366007A | Production of synthetic polymeric compositions comprising s… | Expired / Lapsed | 1942-08-11 | 1944-12-26 | 0 | Details |
| US2365512A | Multivibrator | Expired / Lapsed | 1943-03-24 | 1944-12-19 | 0 | Details |
| US2364998A | Electric control circuit | Expired / Lapsed | 1941-08-13 | 1944-12-12 | 0 | Details |
| US2364436A | Insulation for magnetic steel and the like | Expired / Lapsed | 1943-07-07 | 1944-12-05 | 0 | Details |
| US2363835A | Frequency conversion | Expired / Lapsed | 1943-04-01 | 1944-11-28 | 0 | Details |
| US2363055A | Coating apparatus | Expired / Lapsed | 1943-05-29 | 1944-11-21 | 0 | Details |
| US2363109A | Vapor lamp jacket | Expired / Lapsed | 1942-04-01 | 1944-11-21 | 0 | Details |
| US2362871A | Washing machine and method | Expired / Lapsed | 1940-02-21 | 1944-11-14 | 0 | Details |
| US2362235A | Apparatus for indicating variations in densities of transpa… | Expired / Lapsed | 1943-11-10 | 1944-11-07 | 0 | Details |
| US2362294A | Electric control circuit | Expired / Lapsed | 1941-10-01 | 1944-11-07 | 0 | Details |
| US2361495A | Flash lamp | Expired / Lapsed | 1941-12-23 | 1944-10-31 | 0 | Details |
| US2361845A | Electric valve circuit | Expired / Lapsed | 1938-05-07 | 1944-10-31 | 0 | Details |
| US2360157A | Oscillation damper | Expired / Lapsed | 1943-12-31 | 1944-10-10 | 0 | Details |
| US2359080A | Electric control circuit | Expired / Lapsed | 1942-09-30 | 1944-09-26 | 0 | Details |
| US2358810A | Apparatus for starting and controlling discharge devices | Expired / Lapsed | 1942-04-21 | 1944-09-26 | 0 | Details |
| US2359181A | Electric valve circuits | Expired / Lapsed | 1941-07-22 | 1944-09-26 | 0 | Details |
| US2358215A | Protective system | Expired / Lapsed | 1942-01-29 | 1944-09-12 | 0 | Details |
| US2357087A | Electric ship propulsion system | Expired / Lapsed | 1943-02-26 | 1944-08-29 | 0 | Details |
| US2354918A | Temperature control system for electric heating devices | Expired / Lapsed | 1942-08-26 | 1944-08-01 | 0 | Details |
| US2353635A | Cathode for discharge tubes | Expired / Lapsed | 1941-02-11 | 1944-07-18 | 0 | Details |
| US2354081A | Method of forming contacts | Expired / Lapsed | 1940-01-20 | 1944-07-18 | 0 | Details |
| US2352936A | Operating system for discharge lamps | Expired / Lapsed | 1942-07-21 | 1944-07-04 | 0 | Details |
| US2352455A | Frequency multiplier | Expired / Lapsed | 1943-09-30 | 1944-06-27 | 0 | Details |
| US2352159A | Terminal structure | Expired / Lapsed | 1942-06-27 | 1944-06-27 | 0 | Details |
| US2351543A | Electrical discharge device | Expired / Lapsed | 1942-05-02 | 1944-06-13 | 0 | Details |
| US2351439A | Electric valve oscillator | Expired / Lapsed | 1941-05-02 | 1944-06-13 | 0 | Details |
| US2350936A | Surface type heat exchanger | Expired / Lapsed | 1943-06-26 | 1944-06-06 | 0 | Details |
| US2350199A | Vinyl resin | Expired / Lapsed | 1943-10-01 | 1944-05-30 | 0 | Details |
| US2349622A | Manufacture of rectifiers of the blocking layer type | Expired / Lapsed | 1941-12-18 | 1944-05-23 | 0 | Details |
| US2348535A | Accounting apparatus | Expired / Lapsed | 1939-02-09 | 1944-05-09 | 0 | Details |
| US2348016A | Countercircuit | Expired / Lapsed | 1941-11-13 | 1944-05-02 | 0 | Details |
| US2347517A | Dynamoelectric machine | Expired / Lapsed | 1942-07-01 | 1944-04-25 | 0 | Details |
| US2347452A | Battery servicing | Expired / Lapsed | 1942-02-17 | 1944-04-25 | 0 | Details |
| US2347034A | Turbine bucket wheel and the like | Expired / Lapsed | 1942-03-28 | 1944-04-18 | 0 | Details |
| US2346988A | Photographic printing apparatus | Expired / Lapsed | 1941-03-18 | 1944-04-18 | 0 | Details |
| US2345966A | Production of resins from furane derivatives | Expired / Lapsed | 1940-03-26 | 1944-04-04 | 0 | Details |
| US2345019A | Rotating coupling | Expired / Lapsed | 1942-04-29 | 1944-03-28 | 0 | Details |
| US2344820A | Electric blanket temperature control apparatus | Expired / Lapsed | 1942-10-01 | 1944-03-21 | 0 | Details |
| US2344122A | Electric lighting equipment | Expired / Lapsed | 1941-04-07 | 1944-03-14 | 0 | Details |
| US2343664A | Attachment plug | Expired / Lapsed | 1941-04-25 | 1944-03-07 | 0 | Details |
| US2343531A | Directive radiator | Expired / Lapsed | 1941-04-08 | 1944-03-07 | 0 | Details |
| US2340044A | Condensation product and process of making the same | Expired / Lapsed | 1941-08-30 | 1944-01-25 | 0 | Details |
| US2339768A | Synthetic condensation product | Expired / Lapsed | 1941-08-30 | 1944-01-25 | 0 | Details |
| US2339635A | Control system | Expired / Lapsed | 1940-09-18 | 1944-01-18 | 0 | Details |
| US2339111A | Signaling apparatus | Expired / Lapsed | 1941-10-29 | 1944-01-11 | 0 | Details |
| US2338395A | Signal transmission system | Expired / Lapsed | 1940-06-25 | 1944-01-04 | 0 | Details |
| US2337932A | Electric control circuit | Expired / Lapsed | 1941-10-31 | 1943-12-28 | 0 | Details |
| US2337905A | Time delay relay | Expired / Lapsed | 1941-07-23 | 1943-12-28 | 0 | Details |
| US2337361A | Pressure relief device | Expired / Lapsed | 1942-08-11 | 1943-12-21 | 0 | Details |
| US2337329A | Treatment of surfaces | Expired / Lapsed | 1941-12-18 | 1943-12-21 | 0 | Details |
| US2337437A | Lighting fixture | Expired / Lapsed | 1941-04-18 | 1943-12-21 | 0 | Details |
| US2336525A | Liquid-cooled lamp | Expired / Lapsed | 1940-12-06 | 1943-12-14 | 0 | Details |
| US2336232A | Gas turbine power unit | Expired / Lapsed | 1942-07-01 | 1943-12-07 | 0 | Details |
| US2336258A | Carrier current apparatus | Expired / Lapsed | 1942-03-07 | 1943-12-07 | 0 | Details |
| US2335659A | Light-controlling device | Expired / Lapsed | 1940-08-27 | 1943-11-30 | 0 | Details |
| US2335071A | Control system | Expired / Lapsed | 1942-07-03 | 1943-11-23 | 0 | Details |
| US2334530A | Protective means for transmitters | Expired / Lapsed | 1942-05-09 | 1943-11-16 | 0 | Details |
| US2334545A | Condensation product of a urea, an aliphatic aldehyde, and … | Expired / Lapsed | 1939-08-09 | 1943-11-16 | 0 | Details |
| US2333969A | Television system and method of operation | Expired / Lapsed | 1941-05-27 | 1943-11-09 | 0 | Details |
| US2333446A | Current responsive circuit | Expired / Lapsed | 1941-09-30 | 1943-11-02 | 0 | Details |
| US2332911A | Snap action device | Expired / Lapsed | 1942-03-18 | 1943-10-26 | 0 | Details |
| US2333044A | Governing mechanism | Expired / Lapsed | 1941-05-07 | 1943-10-26 | 0 | Details |
| US2332896A | Synthetic composition comprising hydrolyzed acetalized copo… | Expired / Lapsed | 1940-05-29 | 1943-10-26 | 0 | Details |
| US2332325A | Electric control circuit | Expired / Lapsed | 1942-03-06 | 1943-10-19 | 0 | Details |
| US2332300A | Interval timer | Expired / Lapsed | 1941-11-07 | 1943-10-19 | 0 | Details |
| US2330638A | Electric control circuits | Expired / Lapsed | 1941-02-24 | 1943-09-28 | 0 | Details |
| US2330088A | Transformer system | Expired / Lapsed | 1942-03-20 | 1943-09-21 | 0 | Details |
| US2327774A | High frequency current transformer | Expired / Lapsed | 1940-10-31 | 1943-08-24 | 0 | Details |
| US2326552A | Astronomical telescope | Expired / Lapsed | 1941-07-16 | 1943-08-10 | 0 | Details |
| US2326344A | Apparatus for detecting variations in wirelike bodies | Expired / Lapsed | 1941-06-25 | 1943-08-10 | 0 | Details |
| US2326515A | Television system | Expired / Lapsed | 1940-08-03 | 1943-08-10 | 0 | Details |
| US2325965A | Electric valve frequency changer | Expired / Lapsed | 1942-04-25 | 1943-08-03 | 0 | Details |
| US2325366A | Modulation control system | Expired / Lapsed | 1940-07-23 | 1943-07-27 | 0 | Details |
| US2325375A | Aminoplast modified with a malonic ester | Expired / Lapsed | 1940-07-23 | 1943-07-27 | 0 | Details |
| US2324844A | Remote control switch | Expired / Lapsed | 1940-12-18 | 1943-07-20 | 0 | Details |
| US2323924A | Superheterodyne receiver | Expired / Lapsed | 1941-12-11 | 1943-07-13 | 0 | Details |
| US2324314A | Electronic switch | Expired / Lapsed | 1941-11-13 | 1943-07-13 | 0 | Details |
| US2324275A | Electric translating circuit | Expired / Lapsed | 1938-06-23 | 1943-07-13 | 0 | Details |
| US2323413A | Braking system | Expired / Lapsed | 1941-11-21 | 1943-07-06 | 0 | Details |
| US2321971A | Telemetering system | Expired / Lapsed | 1941-09-18 | 1943-06-15 | 0 | Details |
| US2322162A | Control arrangement for signal devices | Expired / Lapsed | 1941-01-02 | 1943-06-15 | 0 | Details |
| US2322080A | Control for runout tables of reversing mills | Expired / Lapsed | 1940-11-06 | 1943-06-15 | 0 | Details |
| US2321424A | Testing of electrical windings | Expired / Lapsed | 1942-06-26 | 1943-06-08 | 0 | Details |
| US2320790A | Electric valve circuits | Expired / Lapsed | 1942-02-03 | 1943-06-01 | 0 | Details |
| US2319826A | Adhesive composition | Expired / Lapsed | 1941-10-10 | 1943-05-25 | 0 | Details |
| US2319780A | Laminated mica | Expired / Lapsed | 1941-05-02 | 1943-05-25 | 0 | Details |
| US2320208A | Contact amplifier | Expired / Lapsed | 1940-08-16 | 1943-05-25 | 0 | Details |
| US2319775A | Electromagnetic induction apparatus | Expired / Lapsed | 1940-09-05 | 1943-05-18 | 0 | Details |
| US2318358A | Condition control system | Expired / Lapsed | 1942-02-16 | 1943-05-04 | 0 | Details |
| US2318361A | Loop assembly | Expired / Lapsed | 1940-09-13 | 1943-05-04 | 0 | Details |
| US2317181A | Urea-formaldehyde-triethanolamine hydrochloride condensatio… | Expired / Lapsed | 1939-08-09 | 1943-04-20 | 0 | Details |
| US2316008A | Electric control circuits | Expired / Lapsed | 1941-11-12 | 1943-04-06 | 0 | Details |
| US2315402A | Protein-modified aminotriazine-formaldehyde condensation pr… | Expired / Lapsed | 1940-10-19 | 1943-03-30 | 0 | Details |
| US2315313A | Cavity resonator | Expired / Lapsed | 1940-07-12 | 1943-03-30 | 0 | Details |
| US2314311A | Apparatus for starting and controlling electric discharge d… | Expired / Lapsed | 1942-04-21 | 1943-03-16 | 0 | Details |
| US2313597A | Thermal overload relay | Expired / Lapsed | 1941-11-08 | 1943-03-09 | 0 | Details |
| US2312321A | Reaction product of aldehydes and guanazo triazines | Expired / Lapsed | 1941-09-30 | 1943-03-02 | 0 | Details |
| US2312888A | Magnetostriction measuring apparatus | Expired / Lapsed | 1941-05-31 | 1943-03-02 | 0 | Details |
| US2312117A | Control system | Expired / Lapsed | 1942-04-23 | 1943-02-23 | 0 | Details |
| US2312232A | Liquid-cooled lamp | Expired / Lapsed | 1941-12-22 | 1943-02-23 | 0 | Details |
| US2311462A | Control apparatus | Expired / Lapsed | 1942-10-16 | 1943-02-16 | 0 | Details |
| US2311409A | Speed governor | Expired / Lapsed | 1941-12-03 | 1943-02-16 | 0 | Details |
| US2310261A | Pressure responsive device | Expired / Lapsed | 1941-02-01 | 1943-02-09 | 0 | Details |
| US2310101A | Excitation circuit for flectric valve apparatus | Expired / Lapsed | 1942-03-25 | 1943-02-02 | 0 | Details |
| US2310105A | Counter circuit | Expired / Lapsed | 1941-04-16 | 1943-02-02 | 0 | Details |
| US2309481A | Frequency monitoring system | Expired / Lapsed | 1941-03-01 | 1943-01-26 | 0 | Details |
| US2308494A | Interpolymerization product of a polycrotyl ester and an un… | Expired / Lapsed | 1939-10-31 | 1943-01-19 | 0 | Details |
| US2307588A | Insulated electrical conductor | Expired / Lapsed | 1938-07-08 | 1943-01-05 | 0 | Details |
| US2307488A | Electric capacitor | Expired / Lapsed | 1938-05-03 | 1943-01-05 | 0 | Details |
| US2306749A | Amplifying system | Expired / Lapsed | 1941-05-22 | 1942-12-29 | 0 | Details |
| US2306784A | Electric control circuit | Expired / Lapsed | 1940-12-17 | 1942-12-29 | 0 | Details |
| US2306626A | Luminescent composition | Expired / Lapsed | 1940-05-24 | 1942-12-29 | 0 | Details |
| US2306791A | Electric valve circuit | Expired / Lapsed | 1938-07-30 | 1942-12-29 | 0 | Details |
| US2306229A | Electric valve system | Expired / Lapsed | 1942-07-10 | 1942-12-22 | 0 | Details |
| US2306211A | Grading apparatus | Expired / Lapsed | 1941-06-17 | 1942-12-22 | 0 | Details |
| US2306222A | Method of rendering materials water repellent | Expired / Lapsed | 1940-11-16 | 1942-12-22 | 0 | Details |
| US2305580A | Electric capacitor | Expired / Lapsed | 1941-08-09 | 1942-12-15 | 0 | Details |
| US2304834A | Coating apparatus | Expired / Lapsed | 1940-02-14 | 1942-12-15 | 0 | Details |
| US2304552A | Electric regulator | Expired / Lapsed | 1940-09-20 | 1942-12-08 | 0 | Details |
| US2303110A | Regulating system | Expired / Lapsed | 1941-03-20 | 1942-11-24 | 0 | Details |
| US2302493A | Amplifying system | Expired / Lapsed | 1941-01-28 | 1942-11-17 | 0 | Details |
| US2301008A | Temperature conditioning apparatus | Expired / Lapsed | 1942-01-01 | 1942-11-03 | 0 | Details |
| US2301007A | Constant temperature apparatus | Expired / Lapsed | 1940-06-22 | 1942-11-03 | 0 | Details |
| US2300223A | Transmission mechanism | Expired / Lapsed | 1941-10-04 | 1942-10-27 | 0 | Details |
| US2299501A | Control system | Expired / Lapsed | 1941-03-01 | 1942-10-20 | 0 | Details |
| US2299554A | Washing machine | Expired / Lapsed | 1940-06-29 | 1942-10-20 | 0 | Details |
| US2299547A | Varnished sheet material | Expired / Lapsed | 1939-11-28 | 1942-10-20 | 0 | Details |
| US2298820A | Regulator system | Expired / Lapsed | 1941-09-06 | 1942-10-13 | 0 | Details |
| US2298877A | Control system | Expired / Lapsed | 1941-03-22 | 1942-10-13 | 0 | Details |
| US2298864A | Synchronizing system | Expired / Lapsed | 1940-09-10 | 1942-10-13 | 0 | Details |
| US2298863A | Image transmission system | Expired / Lapsed | 1940-04-24 | 1942-10-13 | 0 | Details |
| US2298039A | Interpolymer of dimethyl itaconate and ethyl methacrylate | Expired / Lapsed | 1939-09-12 | 1942-10-06 | 0 | Details |
| US2297694A | Washing machine | Expired / Lapsed | 1939-03-25 | 1942-10-06 | 0 | Details |
| US2297605A | Transformer | Expired / Lapsed | 1939-08-02 | 1942-09-29 | 0 | Details |
| US2295293A | Electric system and indicating circuit therefor | Expired / Lapsed | 1942-03-16 | 1942-09-08 | 0 | Details |
| US2295031A | Cooling apparatus for electric lamps | Expired / Lapsed | 1940-08-03 | 1942-09-08 | 0 | Details |
| US2295297A | Protective system | Expired / Lapsed | 1939-08-19 | 1942-09-08 | 0 | Details |
| US2294672A | Electric valve circuit | Expired / Lapsed | 1942-02-28 | 1942-09-01 | 0 | Details |
| US2294756A | Method of manufacturing electrical resistors having negativ… | Expired / Lapsed | 1941-01-14 | 1942-09-01 | 0 | Details |
| US2294664A | Clamp for window sill air conditioners | Expired / Lapsed | 1940-10-22 | 1942-09-01 | 0 | Details |
| US2294730A | Projectile timer | Expired / Lapsed | 1940-09-23 | 1942-09-01 | 0 | Details |
| US2294692A | Measurement of volt ampere demand | Expired / Lapsed | 1940-02-24 | 1942-09-01 | 0 | Details |
| US2294226A | Preparation of granulated polymers and copolymers | Expired / Lapsed | 1939-10-28 | 1942-08-25 | 0 | Details |
| US2294209A | Frequency modulation system | Expired / Lapsed | 1938-11-12 | 1942-08-25 | 0 | Details |
| US2293502A | Electric measuring apparatus | Expired / Lapsed | 1940-04-10 | 1942-08-18 | 0 | Details |
| US2292815A | Washing machine | Expired / Lapsed | 1940-09-21 | 1942-08-11 | 0 | Details |
| US2292174A | Electric protective apparatus | Expired / Lapsed | 1940-02-27 | 1942-08-04 | 0 | Details |
| US2292063A | Muting control | Expired / Lapsed | 1938-04-23 | 1942-08-04 | 0 | Details |
| US2291342A | Electric valve circuit | Expired / Lapsed | 1941-07-23 | 1942-07-28 | 0 | Details |
| US2291344A | Apparatus for manufacturing insulated wire | Expired / Lapsed | 1941-06-11 | 1942-07-28 | 0 | Details |
| US2288295A | Electric valve control circuit | Expired / Lapsed | 1940-10-31 | 1942-06-30 | 0 | Details |
| US2288339A | Electric motor control system | Expired / Lapsed | 1938-12-23 | 1942-06-30 | 0 | Details |
| US2287583A | Coffee maker | Expired / Lapsed | 1940-09-18 | 1942-06-23 | 0 | Details |
| US2287628A | Washing apparatus | Expired / Lapsed | 1939-10-26 | 1942-06-23 | 0 | Details |
| US2286802A | Locking means for anode structures | Expired / Lapsed | 1941-11-21 | 1942-06-16 | 0 | Details |
| US2285896A | Automatic amplification control | Expired / Lapsed | 1941-07-23 | 1942-06-09 | 0 | Details |
| US2285969A | Telemetric system | Expired / Lapsed | 1941-05-07 | 1942-06-09 | 0 | Details |
| US2284392A | Electrical connector | Expired / Lapsed | 1941-01-10 | 1942-05-26 | 0 | Details |
| US2284405A | High frequency apparatus | Expired / Lapsed | 1940-08-17 | 1942-05-26 | 0 | Details |
| US2284378A | Deflecting circuit | Expired / Lapsed | 1940-05-03 | 1942-05-26 | 0 | Details |
| US2284406A | Transformer | Expired / Lapsed | 1940-03-01 | 1942-05-26 | 0 | Details |
| US2284407A | Vibrator inverter system | Expired / Lapsed | 1939-05-27 | 1942-05-26 | 0 | Details |
| US2283719A | Electric valve circuits | Expired / Lapsed | 1941-02-03 | 1942-05-19 | 0 | Details |
| US2283750A | Apparatus for measuring the density of gases | Expired / Lapsed | 1940-01-16 | 1942-05-19 | 0 | Details |
| US2282847A | Washing machine | Expired / Lapsed | 1941-03-13 | 1942-05-12 | 0 | Details |
| US2282894A | Elastic fluid turbine | Expired / Lapsed | 1940-04-02 | 1942-05-12 | 0 | Details |
| US2282832A | Semiconducting tape | Expired / Lapsed | 1939-11-24 | 1942-05-12 | 0 | Details |
| US2282383A | Audio frequency amplifier | Expired / Lapsed | 1939-09-13 | 1942-05-12 | 0 | Details |
| US2282382A | Amplifier system | Expired / Lapsed | 1939-08-19 | 1942-05-12 | 0 | Details |
| US2282882A | Gel composition and method of preparation | Expired / Lapsed | 1938-05-28 | 1942-05-12 | 0 | Details |
| US2282007A | Control of motor operated devices | Expired / Lapsed | 1940-06-25 | 1942-05-05 | 0 | Details |
| US2281948A | Relaxation oscillator | Expired / Lapsed | 1938-12-30 | 1942-05-05 | 0 | Details |
| US2281319A | Control device | Expired / Lapsed | 1940-12-31 | 1942-04-28 | 0 | Details |
| US2281280A | Light relay | Expired / Lapsed | 1940-05-10 | 1942-04-28 | 0 | Details |
| US2280522A | Apparatus for feeding cylindrical metal shells | Expired / Lapsed | 1940-11-30 | 1942-04-21 | 0 | Details |
| US2280524A | Electrical wave analysis | Expired / Lapsed | 1940-11-01 | 1942-04-21 | 0 | Details |
| US2279846A | Temperature measuring apparatus | Expired / Lapsed | 1940-01-27 | 1942-04-14 | 0 | Details |
| US2279884A | Interpolymers of dibenzyl itaconate and ethyl methacrylate | Expired / Lapsed | 1939-09-12 | 1942-04-14 | 0 | Details |
| US2279881A | Interpolymer of di-(secondary butyl) itaconate and ethyl me… | Expired / Lapsed | 1939-09-12 | 1942-04-14 | 0 | Details |
| US2278242A | Evaporative cooler | Expired / Lapsed | 1940-12-28 | 1942-03-31 | 0 | Details |
| US2278212A | Electric control system | Expired / Lapsed | 1940-09-28 | 1942-03-31 | 0 | Details |
| US2277037A | Fruit ripeness tester | Expired / Lapsed | 1940-01-16 | 1942-03-24 | 0 | Details |
| US2277427A | Multiple sequence recorder | Expired / Lapsed | 1939-06-09 | 1942-03-24 | 0 | Details |
| US2277464A | Radio locating and following system | Expired / Lapsed | 1938-12-13 | 1942-03-24 | 0 | Details |
| US2276806A | High frequency apparatus | Expired / Lapsed | 1940-07-26 | 1942-03-17 | 0 | Details |
| US2276822A | Temperature control system | Expired / Lapsed | 1939-12-19 | 1942-03-17 | 0 | Details |
| US2276847A | Method of brazing | Expired / Lapsed | 1939-09-28 | 1942-03-17 | 0 | Details |
| US2276752A | Electric control circuits | Expired / Lapsed | 1939-08-25 | 1942-03-17 | 0 | Details |
| US2276843A | Pressure measuring apparatus | Expired / Lapsed | 1939-03-31 | 1942-03-17 | 0 | Details |
| US2275864A | Cathode ray tube | Expired / Lapsed | 1940-11-27 | 1942-03-10 | 0 | Details |
| US2274365A | Voltage regulator | Expired / Lapsed | 1940-03-08 | 1942-02-24 | 0 | Details |
| US2274422A | Electrical connection | Expired / Lapsed | 1940-01-20 | 1942-02-24 | 0 | Details |
| US2274402A | Washing machine | Expired / Lapsed | 1939-12-29 | 1942-02-24 | 0 | Details |
| US2272841A | Electron multiplier | Expired / Lapsed | 1939-11-15 | 1942-02-10 | 0 | Details |
| US2272770A | Gaseous electric discharge apparatus | Expired / Lapsed | 1939-10-24 | 1942-02-10 | 0 | Details |
| US2270899A | Frequency modulation system | Expired / Lapsed | 1938-11-12 | 1942-01-27 | 0 | Details |
| US2270750A | Washing machine | Expired / Lapsed | 1940-02-29 | 1942-01-20 | 0 | Details |
| US2270167A | Sound device with piezoelectric double plates | Expired / Lapsed | 1939-04-20 | 1942-01-13 | 0 | Details |
| US2269195A | Electric heater | Expired / Lapsed | 1940-12-18 | 1942-01-06 | 0 | Details |
| US2269226A | Cathode ray oscillograph control | Expired / Lapsed | 1940-11-15 | 1942-01-06 | 0 | Details |
| US2269242A | Magnetic contact device | Expired / Lapsed | 1940-11-05 | 1942-01-06 | 0 | Details |
| US2269240A | Recording instrument | Expired / Lapsed | 1939-12-01 | 1942-01-06 | 0 | Details |
| US2269185A | Method of forming coil insulation | Expired / Lapsed | 1939-11-15 | 1942-01-06 | 0 | Details |
| US2269152A | Foil gauge | Expired / Lapsed | 1938-07-09 | 1942-01-06 | 0 | Details |
| US2269151A | Electric control circuits | Expired / Lapsed | 1937-04-24 | 1942-01-06 | 0 | Details |
| US2267404A | Electric control system | Expired / Lapsed | 1940-05-31 | 1941-12-23 | 0 | Details |
| US2267395A | Control system | Expired / Lapsed | 1940-05-11 | 1941-12-23 | 0 | Details |
| US2266616A | Electric discharge lamp circuit | Expired / Lapsed | 1940-06-06 | 1941-12-16 | 0 | Details |
| US2266608A | Pressure measuring apparatus | Expired / Lapsed | 1940-02-13 | 1941-12-16 | 0 | Details |
| US2266595A | Electric discharge device | Expired / Lapsed | 1939-10-27 | 1941-12-16 | 0 | Details |
| US2266619A | Circuit for electric discharge devices | Expired / Lapsed | 1939-10-05 | 1941-12-16 | 0 | Details |
| US2266566A | Means for measuring or gauging the size of orifices or arti… | Expired / Lapsed | 1939-08-31 | 1941-12-16 | 0 | Details |
| US2266569A | Temperature control system | Expired / Lapsed | 1939-08-18 | 1941-12-16 | 0 | Details |
| US2265693A | Refrigerator cabinet gasket | Expired / Lapsed | 1940-09-07 | 1941-12-09 | 0 | Details |
| US2265717A | Electric translating apparatus | Expired / Lapsed | 1940-06-28 | 1941-12-09 | 0 | Details |
| US2265689A | Thermionic amplifier | Expired / Lapsed | 1940-05-29 | 1941-12-09 | 0 | Details |
| US2265381A | Exhaust machine | Expired / Lapsed | 1939-05-26 | 1941-12-09 | 0 | Details |
| US2264541A | Electron discharge device | Expired / Lapsed | 1938-12-14 | 1941-12-02 | 0 | Details |
| US2264055A | Starting circuit for electric discharge devices | Expired / Lapsed | 1939-04-03 | 1941-11-25 | 0 | Details |
| US2263324A | Reversible capactior motor | Expired / Lapsed | 1941-06-27 | 1941-11-18 | 0 | Details |
| US2263319A | Bushing terminal guard | Expired / Lapsed | 1940-12-03 | 1941-11-18 | 0 | Details |
| US2261643A | Noise suppression circuit | Expired / Lapsed | 1940-10-23 | 1941-11-04 | 0 | Details |
| US2261644A | Photoelectric contour follower | Expired / Lapsed | 1940-04-03 | 1941-11-04 | 0 | Details |
| US2261645A | Protective system | Expired / Lapsed | 1940-02-27 | 1941-11-04 | 0 | Details |
| US2260837A | Pressure measuring apparatus | Expired / Lapsed | 1940-07-26 | 1941-10-28 | 0 | Details |
| US2260810A | Control system | Expired / Lapsed | 1940-03-07 | 1941-10-28 | 0 | Details |
| US2260840A | Temperature control system | Expired / Lapsed | 1939-08-19 | 1941-10-28 | 0 | Details |
| US2260036A | Transmission dynamometer | Expired / Lapsed | 1940-08-24 | 1941-10-21 | 0 | Details |
| US2259998A | Automatic gain controlled amplifier | Expired / Lapsed | 1940-07-23 | 1941-10-21 | 0 | Details |
| US2259982A | Radio distance meter | Expired / Lapsed | 1939-09-29 | 1941-10-21 | 0 | Details |
| US2260055A | Magnetic tool | Expired / Lapsed | 1939-09-19 | 1941-10-21 | 0 | Details |
| US2260024A | Insulated electrical conductor | Expired / Lapsed | 1938-09-01 | 1941-10-21 | 0 | Details |
| US2259139A | Recording apparatus | Expired / Lapsed | 1940-02-24 | 1941-10-14 | 0 | Details |
| US2259138A | Method of preparing electrically insulating material | Expired / Lapsed | 1939-03-20 | 1941-10-14 | 0 | Details |
| US2259040A | Electric discharge lamp | Expired / Lapsed | 1938-08-06 | 1941-10-14 | 0 | Details |
| US2258220A | Resinous materials and insulated conductors and other produ… | Expired / Lapsed | 1940-04-27 | 1941-10-07 | 0 | Details |
| US2258222A | Methyl aryl silicones and insulated conductors and other pr… | Expired / Lapsed | 1940-04-27 | 1941-10-07 | 0 | Details |
| US2258221A | Aroxy silicones and insulated conductors and other products… | Expired / Lapsed | 1940-04-27 | 1941-10-07 | 0 | Details |
| US2258219A | Halogenated aryl silicones | Expired / Lapsed | 1939-09-27 | 1941-10-07 | 0 | Details |
| US2258218A | Methyl silicones and related products | Expired / Lapsed | 1939-08-01 | 1941-10-07 | 0 | Details |
| US2256206A | Refrigerator cabinet | Expired / Lapsed | 1938-04-06 | 1941-09-16 | 0 | Details |
| US2255488A | Control system | Expired / Lapsed | 1940-05-25 | 1941-09-09 | 0 | Details |
| US2255485A | Television receiver | Expired / Lapsed | 1939-12-15 | 1941-09-09 | 0 | Details |
| US2255484A | Automatic background control for television systems | Expired / Lapsed | 1938-11-30 | 1941-09-09 | 0 | Details |
| US2255487A | Synthetic resinous compositions | Expired / Lapsed | 1938-04-12 | 1941-09-09 | 0 | Details |
| US2254727A | Discharge device | Expired / Lapsed | 1940-10-22 | 1941-09-02 | 0 | Details |
| US2254697A | Antenna system | Expired / Lapsed | 1940-03-25 | 1941-09-02 | 0 | Details |
| US2253183A | Spring drive mechanism | Expired / Lapsed | 1940-09-05 | 1941-08-19 | 0 | Details |
| US2253185A | Electric discharge apparatus | Expired / Lapsed | 1940-08-31 | 1941-08-19 | 0 | Details |
| US2253170A | Door operating mechanism | Expired / Lapsed | 1939-08-25 | 1941-08-19 | 0 | Details |
| US2253129A | Circuit interrupter | Expired / Lapsed | 1932-01-07 | 1941-08-19 | 0 | Details |
| US2252476A | Base for electric lamps | Expired / Lapsed | 1940-11-29 | 1941-08-12 | 0 | Details |
| US2252457A | Relay apparatus | Expired / Lapsed | 1940-07-13 | 1941-08-12 | 0 | Details |
| US2250986A | Vacuum-tight metal-to-ceramic seal and method of making same | Expired / Lapsed | 1940-09-05 | 1941-07-29 | 0 | Details |
| US2251158A | Transfer and orienting mechanism | Expired / Lapsed | 1939-07-20 | 1941-07-29 | 0 | Details |
| US2250207A | Temperature control system | Expired / Lapsed | 1939-12-16 | 1941-07-22 | 0 | Details |
| US2250209A | Control system | Expired / Lapsed | 1939-11-17 | 1941-07-22 | 0 | Details |
| US2250202A | Control device for electric translating apparatus | Expired / Lapsed | 1938-07-19 | 1941-07-22 | 0 | Details |
| US2249501A | Shaft supporting and lubricating arrangement | Expired / Lapsed | 1940-10-17 | 1941-07-15 | 0 | Details |
| US2249488A | Timing device | Expired / Lapsed | 1940-04-10 | 1941-07-15 | 0 | Details |
| US2249494A | High frequency apparatus | Expired / Lapsed | 1939-12-22 | 1941-07-15 | 0 | Details |
| US2249474A | Electric terminal | Expired / Lapsed | 1939-10-26 | 1941-07-15 | 0 | Details |
| US2249454A | Magnetic novelty | Expired / Lapsed | 1939-06-22 | 1941-07-15 | 0 | Details |
| US2248581A | Deflecting circuits | Expired / Lapsed | 1940-07-10 | 1941-07-08 | 0 | Details |
| US2247890A | Core for electrical apparatus | Expired / Lapsed | 1940-01-26 | 1941-07-01 | 0 | Details |
| US2247805A | Light or exposure meter | Expired / Lapsed | 1939-08-25 | 1941-07-01 | 0 | Details |
| US2247804A | Permanent magnet | Expired / Lapsed | 1939-02-23 | 1941-07-01 | 0 | Details |
| US2247077A | High frequency electronic apparatus | Expired / Lapsed | 1940-07-27 | 1941-06-24 | 0 | Details |
| US2247056A | Condenser control apparatus | Expired / Lapsed | 1939-10-05 | 1941-06-24 | 0 | Details |
| US2247076A | Tuning instrument | Expired / Lapsed | 1939-08-25 | 1941-06-24 | 0 | Details |
| US2247166A | Dynamo regulator system | Expired / Lapsed | 1939-06-24 | 1941-06-24 | 0 | Details |
| US2247057A | Electric valve converting system | Expired / Lapsed | 1939-05-20 | 1941-06-24 | 0 | Details |
| US2246177A | Electric control circuit | Expired / Lapsed | 1940-08-02 | 1941-06-17 | 0 | Details |
| US2246158A | Amplifier | Expired / Lapsed | 1939-08-17 | 1941-06-17 | 0 | Details |
| US2246161A | Selenium cells and method of producing the same | Expired / Lapsed | 1939-06-05 | 1941-06-17 | 0 | Details |
| US2246169A | Governing mechanism for elastic fluid turbines | Expired / Lapsed | 1939-04-05 | 1941-06-17 | 0 | Details |
| US2246239A | Wound core assembling arrangement | Expired / Lapsed | 1938-03-22 | 1941-06-17 | 0 | Details |
| US2244373A | Fluid flow responsive switching device | Expired / Lapsed | 1939-01-14 | 1941-06-03 | 0 | Details |
| US2243555A | Magnet gearing | Expired / Lapsed | 1940-08-21 | 1941-05-27 | 0 | Details |
| US2242764A | Freezing tray | Expired / Lapsed | 1939-10-24 | 1941-05-20 | 0 | Details |
| US2242011A | Strain gauge | Expired / Lapsed | 1940-02-01 | 1941-05-13 | 0 | Details |
| US2241070A | Heat pump system | Expired / Lapsed | 1939-07-15 | 1941-05-06 | 0 | Details |
| US2240184A | Electric gauge | Expired / Lapsed | 1938-03-26 | 1941-04-29 | 0 | Details |
| US2240331A | Lamp string | Expired / Lapsed | 1937-10-30 | 1941-04-29 | 0 | Details |
| US2239436A | Frequency controlling system | Expired / Lapsed | 1938-04-28 | 1941-04-22 | 0 | Details |
| US2237811A | Strip width indicating device | Expired / Lapsed | 1940-07-13 | 1941-04-08 | 0 | Details |
| US2237803A | Control means for gas filled cables | Expired / Lapsed | 1939-01-17 | 1941-04-08 | 0 | Details |
| US2236985A | Oscillator | Expired / Lapsed | 1939-10-28 | 1941-04-01 | 0 | Details |
| US2236998A | Resistance welding | Expired / Lapsed | 1939-06-23 | 1941-04-01 | 0 | Details |
| US2237006A | Electric hygrometer | Expired / Lapsed | 1938-04-21 | 1941-04-01 | 0 | Details |
| US2236299A | Traffic signal controller | Expired / Lapsed | 1940-03-21 | 1941-03-25 | 0 | Details |
| US2236276A | Sequence control system | Expired / Lapsed | 1939-09-16 | 1941-03-25 | 0 | Details |
| US2236298A | Traffic signal controller | Expired / Lapsed | 1938-04-23 | 1941-03-25 | 0 | Details |
| US2235550A | Amplifier | Expired / Lapsed | 1938-11-15 | 1941-03-18 | 0 | Details |
| US2235551A | Electric control system | Expired / Lapsed | 1938-07-15 | 1941-03-18 | 0 | Details |
| US2234720A | Electron discharge apparatus | Expired / Lapsed | 1939-08-10 | 1941-03-11 | 0 | Details |
| US2234713A | Refrigerant evaporator | Expired / Lapsed | 1939-07-21 | 1941-03-11 | 0 | Details |
| US2234696A | Photoelectric cell | Expired / Lapsed | 1937-05-29 | 1941-03-11 | 0 | Details |
| US2233183A | Frequency modulation system | Expired / Lapsed | 1938-11-12 | 1941-02-25 | 0 | Details |
| US2233166A | Means for transferring high frequency power | Expired / Lapsed | 1938-11-01 | 1941-02-25 | 0 | Details |
| US2233198A | Automatic frequency control | Expired / Lapsed | 1938-06-30 | 1941-02-25 | 0 | Details |
| US2232535A | Waterproof telegraph key | Expired / Lapsed | 1940-07-23 | 1941-02-18 | 0 | Details |
| US2232545A | Stoker driving arrangement | Expired / Lapsed | 1939-11-16 | 1941-02-18 | 0 | Details |
| US2231591A | Electric valve circuit | Expired / Lapsed | 1938-05-19 | 1941-02-11 | 0 | Details |
| US2230715A | Control system | Expired / Lapsed | 1940-03-14 | 1941-02-04 | 0 | Details |
| US2230864A | Control system | Expired / Lapsed | 1940-03-01 | 1941-02-04 | 0 | Details |
| US2230945A | Alternating current voltage regulator | Expired / Lapsed | 1938-11-04 | 1941-02-04 | 0 | Details |
| US2229964A | Television synchronizing system | Expired / Lapsed | 1938-10-26 | 1941-01-28 | 0 | Details |
| US2229968A | Electric valve circuits | Expired / Lapsed | 1937-12-14 | 1941-01-28 | 0 | Details |
| US2229449A | Phase shifting circuit | Expired / Lapsed | 1937-12-14 | 1941-01-21 | 0 | Details |
| US2228815A | Frequency conversion system | Expired / Lapsed | 1940-01-27 | 1941-01-14 | 0 | Details |
| US2228834A | Refrigerating system | Expired / Lapsed | 1940-01-13 | 1941-01-14 | 0 | Details |
| US2228844A | Electric valve circuits | Expired / Lapsed | 1938-08-06 | 1941-01-14 | 0 | Details |
| US2228843A | Electric valve circuit | Expired / Lapsed | 1937-12-14 | 1941-01-14 | 0 | Details |
| US2227967A | Mounting for electrical apparatus | Expired / Lapsed | 1940-03-29 | 1941-01-07 | 0 | Details |
| US2227993A | Mounting electrical apparatus | Expired / Lapsed | 1939-03-16 | 1941-01-07 | 0 | Details |
| US2226275A | Magnetic thickness gauge | Expired / Lapsed | 1939-11-16 | 1940-12-24 | 0 | Details |
| US2226288A | System for amplification of direct voltages | Expired / Lapsed | 1937-05-26 | 1940-12-24 | 0 | Details |
| US2225349A | Ventilating fan control | Expired / Lapsed | 1939-02-01 | 1940-12-17 | 0 | Details |
| US2225353A | Light measuring apparatus | Expired / Lapsed | 1938-05-26 | 1940-12-17 | 0 | Details |
| US2224595A | Method for producing cutting tools | Expired / Lapsed | 1939-03-11 | 1940-12-10 | 0 | Details |
| US2223231A | Connector plug | Expired / Lapsed | 1937-09-10 | 1940-11-26 | 0 | Details |
| US2222714A | Control circuit | Expired / Lapsed | 1937-06-03 | 1940-11-26 | 0 | Details |
| US2221517A | Electric valve circuits | Expired / Lapsed | 1938-12-07 | 1940-11-12 | 0 | Details |
| US2221516A | Continuous thickness gauge | Expired / Lapsed | 1937-04-01 | 1940-11-12 | 0 | Details |
| US2220862A | Low-reflectance glass | Expired / Lapsed | 1939-04-28 | 1940-11-05 | 0 | Details |
| US2220769A | Time delay control system | Expired / Lapsed | 1939-04-28 | 1940-11-05 | 0 | Details |
| US2220861A | Reduction of surface reflection | Expired / Lapsed | 1938-06-16 | 1940-11-05 | 0 | Details |
| US2220775A | Ceramic material | Expired / Lapsed | 1937-12-30 | 1940-11-05 | 0 | Details |
| US2220774A | Ceramic material | Expired / Lapsed | 1937-12-30 | 1940-11-05 | 0 | Details |
| US2220770A | Apparatus for controlling the apparent resistance of an amp… | Expired / Lapsed | 1937-01-30 | 1940-11-05 | 0 | Details |
| US2219939A | Bridge arrangement | Expired / Lapsed | 1939-03-01 | 1940-10-29 | 0 | Details |
| US2219891A | Exhausting and sealing method and apparatus | Expired / Lapsed | 1938-10-07 | 1940-10-29 | 0 | Details |
| US2219899A | Binder for making luminescent screens | Expired / Lapsed | 1938-04-06 | 1940-10-29 | 0 | Details |
| US2219200A | Electric valve converting system | Expired / Lapsed | 1939-06-07 | 1940-10-22 | 0 | Details |
| US2219195A | Electronic voltage regulator | Expired / Lapsed | 1939-03-29 | 1940-10-22 | 0 | Details |
| US2219188A | Cathode ray oscillograph control circuits | Expired / Lapsed | 1938-09-21 | 1940-10-22 | 0 | Details |
| US2218390A | Control system | Expired / Lapsed | 1939-01-17 | 1940-10-15 | 0 | Details |
| US2217451A | Process of treating thermoplastic materials | Expired / Lapsed | 1938-03-01 | 1940-10-08 | 0 | Details |
| US2216220A | Luminous brick and construction comprising the same | Expired / Lapsed | 1937-08-25 | 1940-10-01 | 0 | Details |
| US2215777A | Amplitude-limiting amplifier | Expired / Lapsed | 1937-12-15 | 1940-09-24 | 0 | Details |
| US2215999A | Selenium rectifier having an insulating layer | Expired / Lapsed | 1937-05-26 | 1940-09-24 | 0 | Details |
| US2213890A | Electric snap switch | Expired / Lapsed | 1938-09-29 | 1940-09-03 | 0 | Details |
| US2212625A | Television antenna | Expired / Lapsed | 1939-02-23 | 1940-08-27 | 0 | Details |
| US2211606A | Liquid level indicator | Expired / Lapsed | 1939-02-08 | 1940-08-13 | 0 | Details |
| US2210412A | Motor control system | Expired / Lapsed | 1938-05-18 | 1940-08-06 | 0 | Details |
| US2210781A | Control circuit | Expired / Lapsed | 1937-06-08 | 1940-08-06 | 0 | Details |
| US2209814A | Electrical connector | Expired / Lapsed | 1940-02-06 | 1940-07-30 | 0 | Details |
| US2209826A | Protective system | Expired / Lapsed | 1939-02-25 | 1940-07-30 | 0 | Details |
| US2209928A | Electrically insulating composition | Expired / Lapsed | 1937-11-16 | 1940-07-30 | 0 | Details |
| US2208455A | Dry plate electrode system having a control electrode | Expired / Lapsed | 1939-11-13 | 1940-07-16 | 0 | Details |
| US2208110A | Automatic gain control circuit | Expired / Lapsed | 1938-05-14 | 1940-07-16 | 0 | Details |
| US2208447A | Apparatus for straightening woven material | Expired / Lapsed | 1938-04-22 | 1940-07-16 | 0 | Details |
| US2206715A | Temperature responsive apparatus | Expired / Lapsed | 1938-01-13 | 1940-07-02 | 0 | Details |
| US2206702A | Radio voting | Expired / Lapsed | 1936-02-27 | 1940-07-02 | 0 | Details |
| US2204423A | Discharge device | Expired / Lapsed | 1938-06-30 | 1940-06-11 | 0 | Details |
| US2203224A | Electric switch | Expired / Lapsed | 1939-04-13 | 1940-06-04 | 0 | Details |
| US2203545A | Piezoelectric device | Expired / Lapsed | 1938-06-18 | 1940-06-04 | 0 | Details |
| US2202699A | Transmission apparatus | Expired / Lapsed | 1935-12-21 | 1940-05-28 | 0 | Details |
| US2201857A | Antenna | Expired / Lapsed | 1938-12-29 | 1940-05-21 | 0 | Details |
| US2200962A | Ultra short wave device | Expired / Lapsed | 1938-12-31 | 1940-05-14 | 0 | Details |
| US2199350A | Automatic volume control system | Expired / Lapsed | 1938-12-08 | 1940-04-30 | 0 | Details |
| US2199169A | Automatic gain control system | Expired / Lapsed | 1938-10-21 | 1940-04-30 | 0 | Details |
| US2199209A | Extrusion device | Expired / Lapsed | 1937-05-26 | 1940-04-30 | 0 | Details |
| US2197562A | Molded glass article | Expired / Lapsed | 1937-12-21 | 1940-04-16 | 0 | Details |
| US2196820A | Arrangement for extinguishing electric arcs | Expired / Lapsed | 1939-03-07 | 1940-04-09 | 0 | Details |
| US2196830A | Photoelectric cell | Expired / Lapsed | 1937-05-29 | 1940-04-09 | 0 | Details |
| US2195996A | Electric control circuit | Expired / Lapsed | 1937-04-24 | 1940-04-02 | 0 | Details |
| US2196033A | Molding compound and molded article of manufacture | Expired / Lapsed | 1936-10-01 | 1940-04-02 | 0 | Details |
| US2195958A | Electrically heated blanket | Expired / Lapsed | 1936-09-04 | 1940-04-02 | 0 | Details |
| US2195121A | Electric valve circuits | Expired / Lapsed | 1938-12-17 | 1940-03-26 | 0 | Details |
| US2195233A | Electrical coil | Expired / Lapsed | 1938-07-08 | 1940-03-26 | 0 | Details |
| US2194310A | Signaling system and apparatus | Expired / Lapsed | 1935-08-08 | 1940-03-19 | 0 | Details |
| US2193634A | Capacitor motor control | Expired / Lapsed | 1938-10-21 | 1940-03-12 | 0 | Details |
| US2193361A | High frequency apparatus | Expired / Lapsed | 1936-04-09 | 1940-03-12 | 0 | Details |
| US2192047A | Discharge apparatus | Expired / Lapsed | 1939-02-02 | 1940-02-27 | 0 | Details |
| US2192061A | Carrier current system | Expired / Lapsed | 1935-12-19 | 1940-02-27 | 0 | Details |
| US2190757A | Electric valve circuit | Expired / Lapsed | 1937-08-11 | 1940-02-20 | 0 | Details |
| US2190513A | High frequency circuits | Expired / Lapsed | 1936-03-24 | 1940-02-13 | 0 | Details |
| US2190528A | Electric projection device | Expired / Lapsed | 1936-03-13 | 1940-02-13 | 0 | Details |
| US2189580A | Method of making a photoelectric cell | Expired / Lapsed | 1937-05-29 | 1940-02-06 | 0 | Details |
| US2188178A | Connector for sector conductor cables | Expired / Lapsed | 1938-09-16 | 1940-01-23 | 0 | Details |
| US2186826A | Eccentricity indicator | Expired / Lapsed | 1936-09-12 | 1940-01-09 | 0 | Details |
| US2185807A | Cathode ray tube | Expired / Lapsed | 1938-04-08 | 1940-01-02 | 0 | Details |
| US2184270A | Heating device | Expired / Lapsed | 1939-08-08 | 1939-12-26 | 0 | Details |
| US2181803A | Remote indicator | Expired / Lapsed | 1938-11-04 | 1939-11-28 | 0 | Details |
| US2181246A | Coffee maker | Expired / Lapsed | 1937-09-29 | 1939-11-28 | 0 | Details |
| US2181728A | Traffic analyzer | Expired / Lapsed | 1936-07-24 | 1939-11-28 | 0 | Details |
| US2179366A | Electric valve converting system | Expired / Lapsed | 1938-01-28 | 1939-11-07 | 0 | Details |
| US2179342A | Protective means for electric circuits | Expired / Lapsed | 1935-12-03 | 1939-11-07 | 0 | Details |
| US2178432A | Method of and apparatus for producing a variable alternatin… | Expired / Lapsed | 1938-08-12 | 1939-10-31 | 0 | Details |
| US2177691A | Luminescent or phosphorescent body and the process of manuf… | Expired / Lapsed | 1936-06-25 | 1939-10-31 | 0 | Details |
| US2177509A | Terminal structure | Expired / Lapsed | 1937-04-28 | 1939-10-24 | 0 | Details |
| US2177217A | Vehicle head lamp | Expired / Lapsed | 1937-03-23 | 1939-10-24 | 0 | Details |
| US2177508A | Terminal structure | Expired / Lapsed | 1936-07-29 | 1939-10-24 | 0 | Details |
| US2176718A | Electric disconnecting device | Expired / Lapsed | 1936-12-12 | 1939-10-17 | 0 | Details |
| US2175877A | Liquid composition | Expired / Lapsed | 1936-09-30 | 1939-10-10 | 0 | Details |
| US2175345A | Electric gaseous discharge device | Expired / Lapsed | 1936-06-27 | 1939-10-10 | 0 | Details |
| US2175935A | Motor control | Expired / Lapsed | 1935-12-20 | 1939-10-10 | 0 | Details |
| US2175032A | Single phase motor control | Expired / Lapsed | 1937-07-30 | 1939-10-03 | 0 | Details |
| US2175017A | Electric control circuit | Expired / Lapsed | 1937-07-24 | 1939-10-03 | 0 | Details |
| US2170457A | Electric discharge apparatus | Expired / Lapsed | 1938-12-20 | 1939-08-22 | 0 | Details |
| US2170448A | Electric discharge apparatus | Expired / Lapsed | 1938-03-22 | 1939-08-22 | 0 | Details |
| US2169866A | Electric control and indicating means | Expired / Lapsed | 1936-01-30 | 1939-08-15 | 0 | Details |
| US2169116A | Product meter | Expired / Lapsed | 1938-04-29 | 1939-08-08 | 0 | Details |
| US2169101A | Thermocouple wattmeter | Expired / Lapsed | 1938-04-29 | 1939-08-08 | 0 | Details |
| US2169093A | Electrical control system | Expired / Lapsed | 1937-01-02 | 1939-08-08 | 0 | Details |
| US2168166A | Heat exchange apparatus | Expired / Lapsed | 1938-01-22 | 1939-08-01 | 0 | Details |
| US2168149A | Telemetering | Expired / Lapsed | 1937-06-30 | 1939-08-01 | 0 | Details |
| US2167539A | Method of making flanged cylinders | Expired / Lapsed | 1937-12-28 | 1939-07-25 | 0 | Details |
| US2167536A | Submarine signaling | Expired / Lapsed | 1937-06-09 | 1939-07-25 | 0 | Details |
| US2167472A | Thermostatic control of electron discharge apparatus | Expired / Lapsed | 1936-11-18 | 1939-07-25 | 0 | Details |
| US2167513A | Automatic totalizing system | Expired / Lapsed | 1935-03-26 | 1939-07-25 | 0 | Details |
| US2166833A | Synchronizing apparatus | Expired / Lapsed | 1937-02-26 | 1939-07-18 | 0 | Details |
| US2166791A | Refrigerator | Expired / Lapsed | 1935-06-28 | 1939-07-18 | 0 | Details |
| US2165992A | Dynamic balancing of rotating bodies | Expired / Lapsed | 1937-01-26 | 1939-07-11 | 0 | Details |
| US2163409A | Ceramic-to-metal seal | Expired / Lapsed | 1937-11-22 | 1939-06-20 | 0 | Details |
| US2163393A | Selenium rectifier having light metal carrier electrodes | Expired / Lapsed | 1937-06-08 | 1939-06-20 | 0 | Details |
| US2162586A | Refrigerant evaporator | Expired / Lapsed | 1937-06-12 | 1939-06-13 | 0 | Details |
| US2161604A | Washing machine | Expired / Lapsed | 1935-04-06 | 1939-06-06 | 0 | Details |
| US2160592A | Temperature regulating system | Expired / Lapsed | 1936-12-08 | 1939-05-30 | 0 | Details |
| US2158855A | Hydraulic press for cable connectors | Expired / Lapsed | 1938-08-10 | 1939-05-16 | 0 | Details |
| US2158850A | Temperature control device | Expired / Lapsed | 1937-11-30 | 1939-05-16 | 0 | Details |
| US2158851A | Socket | Expired / Lapsed | 1937-02-03 | 1939-05-16 | 0 | Details |
| US2155248A | Optical comparator | Expired / Lapsed | 1937-08-20 | 1939-04-18 | 0 | Details |
| US2155267A | Foil gauge | Expired / Lapsed | 1937-02-19 | 1939-04-18 | 0 | Details |
| US2155256A | Temperature regulating system | Expired / Lapsed | 1936-09-10 | 1939-04-18 | 0 | Details |
| US2155229A | Protective system | Expired / Lapsed | 1936-08-20 | 1939-04-18 | 0 | Details |
| US2155262A | Comfort responsive apparatus | Expired / Lapsed | 1935-11-08 | 1939-04-18 | 0 | Details |
| US2155255A | Temperature control system | Expired / Lapsed | 1935-09-21 | 1939-04-18 | 0 | Details |
| US2154314A | Motor control | Expired / Lapsed | 1935-12-20 | 1939-04-11 | 0 | Details |
| US2153363A | Laminated metal body | Expired / Lapsed | 1936-12-08 | 1939-04-04 | 0 | Details |
| US2151570A | Control system | Expired / Lapsed | 1936-02-27 | 1939-03-21 | 0 | Details |
| US2149092A | Saturable core detector | Expired / Lapsed | 1938-03-26 | 1939-02-28 | 0 | Details |
| US2147492A | Oscillation generator | Expired / Lapsed | 1935-10-17 | 1939-02-14 | 0 | Details |
| US2146579A | Electric discharge lamp | Expired / Lapsed | 1936-04-22 | 1939-02-07 | 0 | Details |
| US2145117A | Speed-governing mechanism | Expired / Lapsed | 1937-08-31 | 1939-01-24 | 0 | Details |
| US2144541A | Equivalent capacitance network | Expired / Lapsed | 1936-10-22 | 1939-01-17 | 0 | Details |
| US2143723A | Method and apparatus for applying metal coatings | Expired / Lapsed | 1935-03-13 | 1939-01-10 | 0 | Details |
| US2142837A | Discharge lamp system | Expired / Lapsed | 1937-03-27 | 1939-01-03 | 0 | Details |
| US2141937A | Electric phase shifting circuits | Expired / Lapsed | 1936-08-12 | 1938-12-27 | 0 | Details |
| US2141923A | Ventilating apparatus | Expired / Lapsed | 1936-04-16 | 1938-12-27 | 0 | Details |
| US2141319A | Simplified structure for driving spinning blades | Expired / Lapsed | 1936-04-07 | 1938-12-27 | 0 | Details |
| US2141286A | Coupling-on or bridging implement | Expired / Lapsed | 1936-02-01 | 1938-12-27 | 0 | Details |
| US2141910A | Electric cable | Expired / Lapsed | 1935-03-19 | 1938-12-27 | 0 | Details |
| US2140390A | Speed responsive means | Expired / Lapsed | 1936-06-17 | 1938-12-13 | 0 | Details |
| US2140376A | Electric panel board | Expired / Lapsed | 1936-06-06 | 1938-12-13 | 0 | Details |
| US2139509A | Recorder | Expired / Lapsed | 1936-09-12 | 1938-12-06 | 0 | Details |
| US2139489A | Frequency responsive relay | Expired / Lapsed | 1936-08-27 | 1938-12-06 | 0 | Details |
| US2138668A | Telemetering system and apparatus | Expired / Lapsed | 1936-09-10 | 1938-11-29 | 0 | Details |
| US2138655A | Receiving system | Expired / Lapsed | 1935-06-21 | 1938-11-29 | 0 | Details |
| US2137859A | Frequency meter | Expired / Lapsed | 1937-09-29 | 1938-11-22 | 0 | Details |
| US2137831A | Method of producing dry plate elements for selenium rectifi… | Expired / Lapsed | 1937-05-26 | 1938-11-22 | 0 | Details |
| US2137846A | Measuring instrument for alternating current circuits | Expired / Lapsed | 1937-02-25 | 1938-11-22 | 0 | Details |
| US2137126A | Electric valve circuit | Expired / Lapsed | 1936-04-25 | 1938-11-15 | 0 | Details |
| US2137133A | Apparatus for integrating variable quantities | Expired / Lapsed | 1934-06-18 | 1938-11-15 | 0 | Details |
| US2136248A | Electrical regulation | Expired / Lapsed | 1937-01-30 | 1938-11-08 | 0 | Details |
| US2135295A | Supervisory control system | Expired / Lapsed | 1937-01-21 | 1938-11-01 | 0 | Details |
| US2135315A | Coil insulation | Expired / Lapsed | 1935-09-04 | 1938-11-01 | 0 | Details |
| US2134581A | Recording instrument | Expired / Lapsed | 1934-06-09 | 1938-10-25 | 0 | Details |
| US2133872A | Selective control for air conditioning apparatus | Expired / Lapsed | 1935-07-23 | 1938-10-18 | 0 | Details |
| US2133141A | Vacuum cleaner | Expired / Lapsed | 1936-12-05 | 1938-10-11 | 0 | Details |
| US2132277A | Control system | Expired / Lapsed | 1937-02-12 | 1938-10-04 | 0 | Details |
| US2130879A | Method of making a vacuum-tight joint between solid bodies | Expired / Lapsed | 1937-03-24 | 1938-09-20 | 0 | Details |
| US2130429A | Electric valve circuits | Expired / Lapsed | 1936-01-30 | 1938-09-20 | 0 | Details |
| US2130272A | Piezoelectric crystal oscillator | Expired / Lapsed | 1938-03-31 | 1938-09-13 | 0 | Details |
| US2129529A | Elastic fluid turbine turning mechanism | Expired / Lapsed | 1938-02-17 | 1938-09-06 | 0 | Details |
| US2129524A | Current transformer | Expired / Lapsed | 1936-10-31 | 1938-09-06 | 0 | Details |
| US2128812A | Remote signaling system | Expired / Lapsed | 1936-10-16 | 1938-08-30 | 0 | Details |
| US2126285A | Refrigerator | Expired / Lapsed | 1930-12-10 | 1938-08-09 | 0 | Details |
| US2125799A | Circuits for arc-back suppression | Expired / Lapsed | 1936-04-16 | 1938-08-02 | 0 | Details |
| US2124410A | Relay apparatus | Expired / Lapsed | 1935-08-30 | 1938-07-19 | 0 | Details |
| US2121625A | Heating and cooling system | Expired / Lapsed | 1936-11-17 | 1938-06-21 | 0 | Details |
| US2120092A | Clutch | Expired / Lapsed | 1936-08-06 | 1938-06-07 | 0 | Details |
| US2119393A | Electric cable and method of manufacturing the same | Expired / Lapsed | 1934-07-18 | 1938-05-31 | 0 | Details |
| US2118017A | Electrical insulation | Expired / Lapsed | 1936-03-07 | 1938-05-17 | 0 | Details |
| US2117131A | Supercharger arrangement | Expired / Lapsed | 1936-06-02 | 1938-05-10 | 0 | Details |
| US2115495A | Bushing | Expired / Lapsed | 1936-05-16 | 1938-04-26 | 0 | Details |
| US2115582A | Time delay undervoltage protective system | Expired / Lapsed | 1936-03-19 | 1938-04-26 | 0 | Details |
| US2114828A | Electric valve circuit | Expired / Lapsed | 1936-07-03 | 1938-04-19 | 0 | Details |
| US2113090A | Luminescent material | Expired / Lapsed | 1937-06-03 | 1938-04-05 | 0 | Details |
| US2112038A | Air conditioning system | Expired / Lapsed | 1936-05-05 | 1938-03-22 | 0 | Details |
| US2111423A | Speed regulation | Expired / Lapsed | 1936-04-08 | 1938-03-15 | 0 | Details |
| US2110015A | Electric timing and counting device | Expired / Lapsed | 1932-03-09 | 1938-03-01 | 0 | Details |
| US2109368A | High voltage bushing | Expired / Lapsed | 1936-09-15 | 1938-02-22 | 0 | Details |
| US2108662A | Inductor dynamo-electric machine | Expired / Lapsed | — | 1938-02-15 | 0 | Details |
| US2107902A | Supervisory control system | Expired / Lapsed | 1933-09-12 | 1938-02-08 | 0 | Details |
| US2106581A | Electric switch | Expired / Lapsed | 1936-10-31 | 1938-01-25 | 0 | Details |
| US2106040A | Blower rotor for very high peripheral velocity | Expired / Lapsed | 1937-01-11 | 1938-01-18 | 0 | Details |
| US2105513A | Directional self-starting inductor motor | Expired / Lapsed | 1936-07-22 | 1938-01-18 | 0 | Details |
| US2105514A | Self-reversing motor drive | Expired / Lapsed | 1936-07-22 | 1938-01-18 | 0 | Details |
| US2106039A | Condenser dielectric material | Expired / Lapsed | 1935-12-12 | 1938-01-18 | 0 | Details |
| US2105430A | Electric lamp | Expired / Lapsed | 1929-09-18 | 1938-01-11 | 0 | Details |
| US2103907A | Time switch | Expired / Lapsed | 1937-05-15 | 1937-12-28 | 0 | Details |
| US2103085A | Electric lamp | Expired / Lapsed | 1937-07-16 | 1937-12-21 | 0 | Details |
| US2102664A | Control system | Expired / Lapsed | 1935-01-16 | 1937-12-21 | 0 | Details |
| US2100833A | Damping device for indicating instruments | Expired / Lapsed | 1936-02-17 | 1937-11-30 | 0 | Details |
| US2098051A | Oscillator control | Expired / Lapsed | 1936-03-16 | 1937-11-02 | 0 | Details |
| US2098080A | Incandescent lamp and the like | Expired / Lapsed | 1936-01-02 | 1937-11-02 | 0 | Details |
| US2095124A | Electric translating circuit | Expired / Lapsed | 1931-12-30 | 1937-10-05 | 0 | Details |
| US2094483A | Art of uniting metals | Expired / Lapsed | 1937-04-27 | 1937-09-28 | 0 | Details |
| US2094472A | Graphical analyzer | Expired / Lapsed | 1935-05-10 | 1937-09-28 | 0 | Details |
| US2093883A | Electric valve circuit | Expired / Lapsed | 1935-11-08 | 1937-09-21 | 0 | Details |
| US2091152A | Oscillograph | Expired / Lapsed | 1936-06-17 | 1937-08-24 | 0 | Details |
| US2090526A | Circuit controlling device | Expired / Lapsed | 1936-04-03 | 1937-08-17 | 0 | Details |
| US2090522A | Electrical control device | Expired / Lapsed | 1935-03-07 | 1937-08-17 | 0 | Details |
| US2089695A | Oscillation generator | Expired / Lapsed | 1936-03-11 | 1937-08-10 | 0 | Details |
| US2085549A | Electric control device | Expired / Lapsed | 1935-10-17 | 1937-06-29 | 0 | Details |
| US2085587A | Method of brazing | Expired / Lapsed | 1935-05-29 | 1937-06-29 | 0 | Details |
| US2084870A | System of electrical distribution | Expired / Lapsed | 1935-10-10 | 1937-06-22 | 0 | Details |
| US2084899A | System of electrical distribution | Expired / Lapsed | 1935-10-10 | 1937-06-22 | 0 | Details |
| US2084294A | Check valve | Expired / Lapsed | 1934-11-15 | 1937-06-15 | 0 | Details |
| US2082644A | Electric valve translating circuit | Expired / Lapsed | 1936-01-02 | 1937-06-01 | 0 | Details |
| US2081780A | Electric control circuits | Expired / Lapsed | 1936-05-27 | 1937-05-25 | 0 | Details |
| US2080902A | Gaseous electric discharge metal vapor lamp device | Expired / Lapsed | 1934-09-18 | 1937-05-18 | 0 | Details |
| US2081047A | Clamp | Expired / Lapsed | 1929-12-10 | 1937-05-18 | 0 | Details |
| US2079466A | Electrical control system | Expired / Lapsed | 1934-07-20 | 1937-05-04 | 0 | Details |
| US2078800A | Paper break detector | Expired / Lapsed | 1936-12-03 | 1937-04-27 | 0 | Details |
| US2078781A | Time switch | Expired / Lapsed | 1936-02-05 | 1937-04-27 | 0 | Details |
| US2078796A | Vibration meter | Expired / Lapsed | 1934-11-01 | 1937-04-27 | 0 | Details |
| US2078792A | Electric timing and counting device | Expired / Lapsed | 1933-07-11 | 1937-04-27 | 0 | Details |
| US2077242A | Record chart quantity indication | Expired / Lapsed | 1933-11-23 | 1937-04-13 | 0 | Details |
| US2076368A | High frequency power supply system | Expired / Lapsed | 1935-05-03 | 1937-04-06 | 0 | Details |
| US2074126A | Frequency regulating system | Expired / Lapsed | 1935-07-12 | 1937-03-16 | 0 | Details |
| US2074136A | Resilient mounting | Expired / Lapsed | 1934-05-25 | 1937-03-16 | 0 | Details |
| US2071173A | Timer | Expired / Lapsed | 1936-05-13 | 1937-02-16 | 0 | Details |
| US2071184A | Indicating system | Expired / Lapsed | 1929-01-26 | 1937-02-16 | 0 | Details |
| US2070446A | Thyratron inverter stabilizer | Expired / Lapsed | 1934-09-29 | 1937-02-09 | 0 | Details |
| US2069633A | Frequency determining unit for piezoelectric crystal contro… | Expired / Lapsed | 1935-10-25 | 1937-02-02 | 0 | Details |
| US2069087A | Apparatus for the manufacture of insulated wire | Expired / Lapsed | 1933-11-28 | 1937-01-26 | 0 | Details |
| US2068559A | Single-phase multispeed motor control | Expired / Lapsed | 1936-05-29 | 1937-01-19 | 0 | Details |
| US2066949A | Craft navigating apparatus | Expired / Lapsed | 1936-05-16 | 1937-01-05 | 0 | Details |
| US2064651A | Humidity responsive device | Expired / Lapsed | 1931-12-30 | 1936-12-15 | 0 | Details |
| US2061410A | Telemetering and position-signaling device and system | Expired / Lapsed | 1933-08-08 | 1936-11-17 | 0 | Details |
| US2059870A | Protective means for radio receiving apparatus | Expired / Lapsed | 1930-10-07 | 1936-11-03 | 0 | Details |
| US2059004A | Cathode ray oscillograph sweep circuit | Expired / Lapsed | 1935-09-21 | 1936-10-27 | 0 | Details |
| US2058946A | Electrical compression or tension gauge | Expired / Lapsed | 1931-07-30 | 1936-10-27 | 0 | Details |
| US2057531A | Electric indicating system | Expired / Lapsed | 1932-12-23 | 1936-10-13 | 0 | Details |
| US2057541A | Supervisory control system | Expired / Lapsed | 1930-11-18 | 1936-10-13 | 0 | Details |
| US2056348A | Control system | Expired / Lapsed | 1935-12-21 | 1936-10-06 | 0 | Details |
| US2056633A | Electric lamp unit | Expired / Lapsed | 1935-03-05 | 1936-10-06 | 0 | Details |
| US2056040A | Control system | Expired / Lapsed | 1935-01-30 | 1936-09-29 | 0 | Details |
| US2056050A | Automatic change speed gearing | Expired / Lapsed | 1934-10-11 | 1936-09-29 | 0 | Details |
| US2053135A | Fabricated slab | Expired / Lapsed | 1935-10-25 | 1936-09-01 | 0 | Details |
| US2053110A | Signaling system and apparatus | Expired / Lapsed | 1932-10-21 | 1936-09-01 | 0 | Details |
| US2051018A | Speed ratio indicating device | Expired / Lapsed | 1934-03-28 | 1936-08-11 | 0 | Details |
| US2049306A | Method and apparatus for testing filament wire | Expired / Lapsed | 1935-01-24 | 1936-07-28 | 0 | Details |
| US2049376A | Electrical amplifying circuit | Expired / Lapsed | 1932-12-06 | 1936-07-28 | 0 | Details |
| US2047665A | Electric counting apparatus | Expired / Lapsed | 1932-12-08 | 1936-07-14 | 0 | Details |
| US2047023A | Base for incandescent lamps and similar devices | Expired / Lapsed | 1932-12-24 | 1936-07-07 | 0 | Details |
| US2043196A | Electric heater | Expired / Lapsed | 1935-09-17 | 1936-06-02 | 0 | Details |
| US2043044A | Electric cable | Expired / Lapsed | 1935-03-05 | 1936-06-02 | 0 | Details |
| US2042496A | Multistage rotary compressor | Expired / Lapsed | 1935-02-12 | 1936-06-02 | 0 | Details |
| US2042542A | Electric current rectifier | Expired / Lapsed | 1934-04-12 | 1936-06-02 | 0 | Details |
| US2043020A | Pipe welding apparatus | Expired / Lapsed | 1933-12-12 | 1936-06-02 | 0 | Details |
| US2040677A | Pulsation apparatus | Expired / Lapsed | 1933-09-12 | 1936-05-12 | 0 | Details |
| US2039043A | Electric regulating system | Expired / Lapsed | 1933-07-01 | 1936-04-28 | 0 | Details |
| US2037565A | Control system | Expired / Lapsed | 1934-05-11 | 1936-04-14 | 0 | Details |
| US2037535A | Vacuum apparatus | Expired / Lapsed | 1933-09-27 | 1936-04-14 | 0 | Details |
| US2036781A | Cabinet door | Expired / Lapsed | 1934-06-14 | 1936-04-07 | 0 | Details |
| US2035726A | Elastic fluid power plant | Expired / Lapsed | 1933-08-31 | 1936-03-31 | 0 | Details |
| US2032620A | Electron discharge apparatus | Expired / Lapsed | 1930-09-02 | 1936-03-03 | 0 | Details |
| US2032260A | Wire feeding apparatus | Expired / Lapsed | 1934-12-18 | 1936-02-25 | 0 | Details |
| US2032294A | Electric heating pad | Expired / Lapsed | 1933-10-11 | 1936-02-25 | 0 | Details |
| US2031509A | Electric control means | Expired / Lapsed | 1934-01-25 | 1936-02-18 | 0 | Details |
| US2030440A | Manufacture of fabricated glass articles | Expired / Lapsed | 1934-12-20 | 1936-02-11 | 0 | Details |
| US2030390A | Glass | Expired / Lapsed | 1934-08-11 | 1936-02-11 | 0 | Details |
| US2027864A | Phase-sequence indicator | Expired / Lapsed | 1934-10-25 | 1936-01-14 | 0 | Details |
| US2027140A | Torque amplifying system | Expired / Lapsed | 1932-11-02 | 1936-01-07 | 0 | Details |
| US2024979A | Cathode ray apparatus | Expired / Lapsed | 1934-03-23 | 1935-12-17 | 0 | Details |
| US2024173A | Electric translating circuit | Expired / Lapsed | 1932-10-22 | 1935-12-17 | 0 | Details |
| US2022523A | Air conditioning apparatus | Expired / Lapsed | 1934-07-27 | 1935-11-26 | 0 | Details |
| US2021766A | Electronic timer | Expired / Lapsed | 1934-06-28 | 1935-11-19 | 0 | Details |
| US2021752A | Electric-circuit resistance-sensitive apparatus | Expired / Lapsed | 1932-05-26 | 1935-11-19 | 0 | Details |
| US2021753A | Electric circuit control means | Expired / Lapsed | 1932-05-26 | 1935-11-19 | 0 | Details |
| US2020972A | Protective arrangement for electric systems | Expired / Lapsed | 1933-10-19 | 1935-11-12 | 0 | Details |
| US2021062A | Indicator for incandescent lamps | Expired / Lapsed | 1932-12-09 | 1935-11-12 | 0 | Details |
| US2019349A | Synthetic resin | Expired / Lapsed | 1930-05-12 | 1935-10-29 | 0 | Details |
| US2017703A | Integrating meter | Expired / Lapsed | 1934-09-15 | 1935-10-15 | 0 | Details |
| US2017712A | Frequency determining means | Expired / Lapsed | 1934-03-24 | 1935-10-15 | 0 | Details |
| US2016977A | Direction responsive system | Expired / Lapsed | 1931-12-01 | 1935-10-08 | 0 | Details |
| US2016147A | Electric valve tripping circuit | Expired / Lapsed | 1934-07-21 | 1935-10-01 | 0 | Details |
| US2016148A | Control system | Expired / Lapsed | 1931-08-12 | 1935-10-01 | 0 | Details |
| US2015570A | Cathode ray photographic apparatus | Expired / Lapsed | 1930-12-01 | 1935-09-24 | 0 | Details |
| US2011361A | Automatic reclosing circuit breaker system | Expired / Lapsed | 1934-03-31 | 1935-08-13 | 0 | Details |
| US2011420A | Gas turbine power plant | Expired / Lapsed | 1933-06-14 | 1935-08-13 | 0 | Details |
| US2011381A | Electrical system providing sequence operation | Expired / Lapsed | 1931-12-23 | 1935-08-13 | 0 | Details |
| US2011392A | Airplane altitude indicating system | Expired / Lapsed | 1928-08-10 | 1935-08-13 | 0 | Details |
| US2010610A | Coding apparatus | Expired / Lapsed | 1933-03-01 | 1935-08-06 | 0 | Details |
| US2010712A | Cathode ray tube | Expired / Lapsed | 1930-09-23 | 1935-08-06 | 0 | Details |
| US2007777A | Control mechanism for furnace blowers | Expired / Lapsed | 1933-02-17 | 1935-07-09 | 0 | Details |
| US2007010A | Portable vibration indicator | Expired / Lapsed | 1934-02-01 | 1935-07-02 | 0 | Details |
| US2004564A | Gaseous electric discharge lamp device | Expired / Lapsed | 1934-05-25 | 1935-06-11 | 0 | Details |
| US2004004A | Weatherproof armored cable | Expired / Lapsed | 1933-04-01 | 1935-06-04 | 0 | Details |
| US2003167A | Apparatus for fusing powdered materials | Expired / Lapsed | 1931-01-09 | 1935-05-28 | 0 | Details |
| US2002372A | Vibration velocity measuring device | Expired / Lapsed | 1933-08-23 | 1935-05-21 | 0 | Details |
| US2001498A | Electric translating device | Expired / Lapsed | 1934-12-07 | 1935-05-14 | 0 | Details |
| US2001567A | Electric valve translating circuit | Expired / Lapsed | 1933-12-22 | 1935-05-14 | 0 | Details |
| US2000721A | Centrifugal compressor | Expired / Lapsed | 1932-10-26 | 1935-05-07 | 0 | Details |
| US1998939A | Contouring device | Expired / Lapsed | 1934-03-31 | 1935-04-23 | 0 | Details |
| US1998938A | Control system | Expired / Lapsed | 1932-10-15 | 1935-04-23 | 0 | Details |
| US1998950A | Control system for electron discharge devices | Expired / Lapsed | 1932-02-25 | 1935-04-23 | 0 | Details |
| US1998309A | Halogenated composition | Expired / Lapsed | 1933-11-29 | 1935-04-16 | 0 | Details |
| US1998393A | Turbine bucket | Expired / Lapsed | 1933-09-30 | 1935-04-16 | 0 | Details |
| US1996569A | Piezo-electric device | Expired / Lapsed | 1929-11-16 | 1935-04-02 | 0 | Details |
| US1995881A | Counting apparatus | Expired / Lapsed | 1932-01-30 | 1935-03-26 | 0 | Details |
| US1994325A | Electric circuits | Expired / Lapsed | 1932-05-26 | 1935-03-12 | 0 | Details |
| US1994324A | Electric circuit control means | Expired / Lapsed | 1932-05-26 | 1935-03-12 | 0 | Details |
| US1993580A | Electric terminal connection and method of making the same | Expired / Lapsed | 1932-02-20 | 1935-03-05 | 0 | Details |
| US1992055A | Photo-electric relay apparatus | Expired / Lapsed | 1932-06-29 | 1935-02-19 | 0 | Details |
| US1991223A | Packing machine | Expired / Lapsed | 1932-08-08 | 1935-02-12 | 0 | Details |
| US1990781A | Resistance-capacitance coupled amplifier | Expired / Lapsed | 1932-04-28 | 1935-02-12 | 0 | Details |
| US1989501A | Control system | Expired / Lapsed | 1933-03-18 | 1935-01-29 | 0 | Details |
| US1989509A | Carrier current selector system | Expired / Lapsed | 1928-01-24 | 1935-01-29 | 0 | Details |
| US1988931A | Colored television apparatus | Expired / Lapsed | 1933-05-02 | 1935-01-22 | 0 | Details |
| US1988274A | Electrical apparatus | Expired / Lapsed | 1931-07-09 | 1935-01-15 | 0 | Details |
| US1987577A | Apparatus for the thermic treatment of metal wires, filamen… | Expired / Lapsed | 1932-11-22 | 1935-01-08 | 0 | Details |
| US1985981A | Control system | Expired / Lapsed | 1932-12-10 | 1935-01-01 | 0 | Details |
| US1985964A | Elastic fluid turbine | Expired / Lapsed | 1932-09-13 | 1935-01-01 | 0 | Details |
| US1983342A | Carrier conveyer system | Expired / Lapsed | 1932-06-16 | 1934-12-04 | 0 | Details |
| US1980799A | Control system | Expired / Lapsed | 1933-03-01 | 1934-11-13 | 0 | Details |
| US1980899A | Alternating current generator | Expired / Lapsed | 1931-01-28 | 1934-11-13 | 0 | Details |
| US1977325A | High voltage cable | Expired / Lapsed | 1932-12-24 | 1934-10-16 | 0 | Details |
| US1976659A | Governing mechanism for elastic fluid engines | Expired / Lapsed | 1934-05-03 | 1934-10-09 | 0 | Details |
| US1976461A | Control system | Expired / Lapsed | 1931-11-30 | 1934-10-09 | 0 | Details |
| US1975578A | Welding machine | Expired / Lapsed | 1933-04-20 | 1934-10-02 | 0 | Details |
| US1973673A | Sound or air wave apparatus | Expired / Lapsed | 1931-12-10 | 1934-09-11 | 0 | Details |
| US1971827A | Fan | Expired / Lapsed | 1932-02-09 | 1934-08-28 | 0 | Details |
| US1971191A | Light responsive circuit controller | Expired / Lapsed | 1932-11-16 | 1934-08-21 | 0 | Details |
| US1970103A | Control system | Expired / Lapsed | 1932-03-25 | 1934-08-14 | 0 | Details |
| US1970427A | Thyratron equipment | Expired / Lapsed | 1932-01-30 | 1934-08-14 | 0 | Details |
| US1969536A | Apparatus for controlling the thickness of strip material | Expired / Lapsed | 1932-02-18 | 1934-08-07 | 0 | Details |
| US1967871A | Means and method of detecting leaks in refrigerating systems | Expired / Lapsed | 1931-06-15 | 1934-07-24 | 0 | Details |
| US1967887A | Remote indicating system | Expired / Lapsed | 1931-04-24 | 1934-07-24 | 0 | Details |
| US1966163A | Electric device and dielectric material therefor | Expired / Lapsed | 1932-09-29 | 1934-07-10 | 0 | Details |
| US1961793A | Adjustable speed split phase motor | Expired / Lapsed | 1933-11-18 | 1934-06-05 | 0 | Details |
| US1960058A | Composite support and condenser | Expired / Lapsed | 1932-03-31 | 1934-05-22 | 0 | Details |
| US1959150A | Terminal lug and method of joining same to alpha conductor | Expired / Lapsed | 1929-11-22 | 1934-05-15 | 0 | Details |
| US1958245A | Control system | Expired / Lapsed | 1932-12-29 | 1934-05-08 | 0 | Details |
| US1958259A | Automatic steering equipment | Expired / Lapsed | 1931-08-12 | 1934-05-08 | 0 | Details |
| US1957247A | Photo-electric relay | Expired / Lapsed | 1932-01-21 | 1934-05-01 | 0 | Details |
| US1957240A | Control system | Expired / Lapsed | 1931-11-16 | 1934-05-01 | 0 | Details |
| US1957236A | Circuit control means | Expired / Lapsed | 1930-11-10 | 1934-05-01 | 0 | Details |
| US1954678A | Electric heating apparatus | Expired / Lapsed | 1932-11-29 | 1934-04-10 | 0 | Details |
| US1954657A | Reversible split phase motor | Expired / Lapsed | 1931-11-05 | 1934-04-10 | 0 | Details |
| US1952186A | Variable pulsation apparatus | Expired / Lapsed | 1932-10-01 | 1934-03-27 | 0 | Details |
| US1952171A | Motor control system for automatic poise devices | Expired / Lapsed | 1931-09-03 | 1934-03-27 | 0 | Details |
| US1952899A | Compass | Expired / Lapsed | 1929-11-19 | 1934-03-27 | 0 | Details |
| US1951116A | Electric discharge tube for the emission of rays of light | Expired / Lapsed | 1930-12-12 | 1934-03-13 | 0 | Details |
| US1949216A | Power system | Expired / Lapsed | 1933-04-08 | 1934-02-27 | 0 | Details |
| US1947240A | Rectifier for motion picture projectors | Expired / Lapsed | 1932-10-12 | 1934-02-13 | 0 | Details |
| US1947255A | Telemetric system | Expired / Lapsed | 1929-10-05 | 1934-02-13 | 0 | Details |
| US1946710A | Magnetic compass | Expired / Lapsed | 1928-12-06 | 1934-02-13 | 0 | Details |
| US1945666A | Indicating system | Expired / Lapsed | 1928-11-22 | 1934-02-06 | 0 | Details |
| US1945395A | Sorting apparatus | Expired / Lapsed | 1932-02-25 | 1934-01-30 | 0 | Details |
| US1944988A | Control system | Expired / Lapsed | 1928-07-24 | 1934-01-30 | 0 | Details |
| US1944072A | Automatic reclosing circuit breaker system | Expired / Lapsed | 1931-04-17 | 1934-01-16 | 0 | Details |
| US1943109A | Cathode ray sound recording | Expired / Lapsed | 1931-08-18 | 1934-01-09 | 0 | Details |
| US1941377A | Time selector mechanism | Expired / Lapsed | 1931-07-01 | 1933-12-26 | 0 | Details |
| US1939435A | Photo-electric relay apparatus | Expired / Lapsed | 1932-04-28 | 1933-12-12 | 0 | Details |
| US1938806A | Roll capacitor | Expired / Lapsed | 1929-01-23 | 1933-12-12 | 0 | Details |
| US1937378A | Sound-motion picture producer | Expired / Lapsed | 1933-05-02 | 1933-11-28 | 0 | Details |
| US1937375A | Instrument for transmitting angular movement | Expired / Lapsed | 1933-03-30 | 1933-11-28 | 0 | Details |
| US1937431A | Process of making cable terminals | Expired / Lapsed | 1931-12-14 | 1933-11-28 | 0 | Details |
| US1935729A | Beacon or searchlight | Expired / Lapsed | 1932-03-17 | 1933-11-21 | 0 | Details |
| US1936414A | Electric measuring instrument | Expired / Lapsed | 1931-11-09 | 1933-11-21 | 0 | Details |
| US1936400A | Method and means for signal to aircraft | Expired / Lapsed | 1930-01-27 | 1933-11-21 | 0 | Details |
| US1936442A | Gun fire control apparatus | Expired / Lapsed | 1927-08-29 | 1933-11-21 | 0 | Details |
| US1934499A | Temperature control device | Expired / Lapsed | 1932-01-05 | 1933-11-07 | 0 | Details |
| US1934484A | Camera | Expired / Lapsed | 1931-01-31 | 1933-11-07 | 0 | Details |
| US1933311A | Regulating mechanism for prime movers | Expired / Lapsed | 1932-07-29 | 1933-10-31 | 0 | Details |
| US1933497A | Wound rotor reactor motor | Expired / Lapsed | 1931-09-29 | 1933-10-31 | 0 | Details |
| US1932278A | Method of manufacturing nozzle diaphragms and the like | Expired / Lapsed | 1932-03-25 | 1933-10-24 | 0 | Details |
| US1932269A | Temperature control device for oil burners | Expired / Lapsed | 1931-08-25 | 1933-10-24 | 0 | Details |
| US1931071A | Carrier system | Expired / Lapsed | 1932-07-26 | 1933-10-17 | 0 | Details |
| US1930333A | Protective arrangement | Expired / Lapsed | 1932-07-08 | 1933-10-10 | 0 | Details |
| US1929241A | Telemetric system | Expired / Lapsed | 1927-07-07 | 1933-10-03 | 0 | Details |
| US1928457A | Electric gauge | Expired / Lapsed | 1929-09-12 | 1933-09-26 | 0 | Details |
| US1927676A | Electric timing and counting device | Expired / Lapsed | 1932-03-09 | 1933-09-19 | 0 | Details |
| US1927792A | Photo-electric tube | Expired / Lapsed | 1931-12-01 | 1933-09-19 | 0 | Details |
| US1927794A | Differential protection for electric apparatus | Expired / Lapsed | 1930-09-02 | 1933-09-19 | 0 | Details |
| US1926275A | Electric regulator | Expired / Lapsed | 1931-07-20 | 1933-09-12 | 0 | Details |
| US1922883A | Material handling system | Expired / Lapsed | 1930-06-26 | 1933-08-15 | 0 | Details |
| US1920781A | Power plant | Expired / Lapsed | 1932-04-28 | 1933-08-01 | 0 | Details |
| US1919985A | Cathode ray oscillograph sweep circuit | Expired / Lapsed | 1931-07-23 | 1933-07-25 | 0 | Details |
| US1919976A | Electric power converting apparatus | Expired / Lapsed | 1931-01-26 | 1933-07-25 | 0 | Details |
| US1919982A | Compass | Expired / Lapsed | 1930-08-07 | 1933-07-25 | 0 | Details |
| US1919984A | Method of making grid structures | Expired / Lapsed | 1930-07-01 | 1933-07-25 | 0 | Details |
| US1919992A | Impulse storage mechanism | Expired / Lapsed | 1929-01-18 | 1933-07-25 | 0 | Details |
| US1919053A | Electric control circuit | Expired / Lapsed | 1931-12-10 | 1933-07-18 | 0 | Details |
| US1918071A | Cord terminal | Expired / Lapsed | 1928-02-01 | 1933-07-11 | 0 | Details |
| US1918070A | Electrical cord terminal | Expired / Lapsed | 1927-01-24 | 1933-07-11 | 0 | Details |
| US1917129A | Temperature indicator | Expired / Lapsed | 1931-12-21 | 1933-07-04 | 0 | Details |
| US1915993A | Statistical machine | Expired / Lapsed | 1931-04-27 | 1933-06-27 | 0 | Details |
| US1915019A | Gaseous electric discharge device | Expired / Lapsed | 1932-08-22 | 1933-06-20 | 0 | Details |
| US1914193A | Electrical regulating circuit | Expired / Lapsed | 1931-04-27 | 1933-06-13 | 0 | Details |
| US1913188A | Supervisory system | Expired / Lapsed | 1930-06-09 | 1933-06-06 | 0 | Details |
| US1913214A | Conducting varnish | Expired / Lapsed | 1930-01-21 | 1933-06-06 | 0 | Details |
| US1907471A | Indicating system for aircraft | Expired / Lapsed | 1931-11-16 | 1933-05-09 | 0 | Details |
| US1905703A | Contact rectifier | Expired / Lapsed | 1930-12-05 | 1933-04-25 | 0 | Details |
| US1904485A | Control system | Expired / Lapsed | 1931-09-11 | 1933-04-18 | 0 | Details |
| US1902510A | Electrical discharge device | Expired / Lapsed | 1932-01-20 | 1933-03-21 | 0 | Details |
| US1902496A | High frequency measurement | Expired / Lapsed | 1931-05-27 | 1933-03-21 | 0 | Details |
| US1902465A | Centralized meter recording | Expired / Lapsed | 1930-08-12 | 1933-03-21 | 0 | Details |
| US1901701A | Transformer fault detector | Expired / Lapsed | 1932-09-30 | 1933-03-14 | 0 | Details |
| US1900573A | Electric heating apparatus | Expired / Lapsed | 1930-11-19 | 1933-03-07 | 0 | Details |
| US1900596A | Electric control system | Expired / Lapsed | 1930-09-04 | 1933-03-07 | 0 | Details |
| US1900595A | Circuit controlling and protective device | Expired / Lapsed | 1930-03-18 | 1933-03-07 | 0 | Details |
| US1899591A | Laminated material | Expired / Lapsed | 1930-09-08 | 1933-02-28 | 0 | Details |
| US1897845A | Control system | Expired / Lapsed | 1930-09-16 | 1933-02-14 | 0 | Details |
| US1896534A | Electrical system | Expired / Lapsed | 1927-05-13 | 1933-02-07 | 0 | Details |
| US1895373A | Apparatus for measuring magnetic fields | Expired / Lapsed | 1930-12-24 | 1933-01-24 | 0 | Details |
| US1893768A | Electric regulator | Expired / Lapsed | 1931-04-17 | 1933-01-10 | 0 | Details |
| US1893780A | Electric regulator | Expired / Lapsed | 1931-04-17 | 1933-01-10 | 0 | Details |
| US1893772A | Electrical regulator | Expired / Lapsed | 1931-04-17 | 1933-01-10 | 0 | Details |
| US1893380A | Soldering apparatus | Expired / Lapsed | 1930-10-31 | 1933-01-03 | 0 | Details |
| US1893337A | Lightning field intensity recorder | Expired / Lapsed | 1929-12-28 | 1933-01-03 | 0 | Details |
| US1889597A | Telemetering method and apparatus | Expired / Lapsed | 1929-05-29 | 1932-11-29 | 0 | Details |
| US1888341A | Composite silica article | Expired / Lapsed | 1930-11-06 | 1932-11-22 | 0 | Details |
| US1888099A | Circuit controlling apparatus | Expired / Lapsed | 1930-05-10 | 1932-11-15 | 0 | Details |
| US1886682A | Cable testing equipment | Expired / Lapsed | 1932-03-24 | 1932-11-08 | 0 | Details |
| US1883907A | Automatic oscillograph | Expired / Lapsed | 1931-06-05 | 1932-10-25 | 0 | Details |
| US1884252A | Rotary disk, turbine bucket wheel, or the like | Expired / Lapsed | 1931-05-19 | 1932-10-25 | 0 | Details |
| US1883893A | Chassis for electrical apparatus | Expired / Lapsed | 1930-05-30 | 1932-10-25 | 0 | Details |
| US1879388A | Automatic control of feeding mechanism in tool machines | Expired / Lapsed | 1931-10-23 | 1932-09-27 | 0 | Details |
| US1879575A | Barometer and temperature correcting means and constant vol… | Expired / Lapsed | 1931-03-05 | 1932-09-27 | 0 | Details |
| US1880108A | Gear pump and the like | Expired / Lapsed | 1929-02-04 | 1932-09-27 | 0 | Details |
| US1874723A | Electrical coil | Expired / Lapsed | 1931-09-18 | 1932-08-30 | 0 | Details |
| US1874777A | Electric power control apparatus | Expired / Lapsed | 1930-08-26 | 1932-08-30 | 0 | Details |
| US1875241A | Electrical cord terminal | Expired / Lapsed | 1930-01-13 | 1932-08-30 | 0 | Details |
| US1873776A | Method of basing vacuum tubes and similar articles | Expired / Lapsed | 1926-03-31 | 1932-08-23 | 0 | Details |
| US1872530A | High tension circuit interrupter | Expired / Lapsed | 1930-11-25 | 1932-08-16 | 0 | Details |
| US1869134A | Regulating arrangement for prime movers | Expired / Lapsed | 1931-11-17 | 1932-07-26 | 0 | Details |
| US1869209A | Thermionic measuring device | Expired / Lapsed | 1931-10-16 | 1932-07-26 | 0 | Details |
| US1864363A | Recording apparatus | Expired / Lapsed | 1930-04-21 | 1932-06-21 | 0 | Details |
| US1862354A | Motor control system | Expired / Lapsed | 1930-10-28 | 1932-06-07 | 0 | Details |
| US1857174A | Electric regulating system | Expired / Lapsed | 1931-04-17 | 1932-05-10 | 0 | Details |
| US1857220A | Switch operating mechanism | Expired / Lapsed | 1930-07-11 | 1932-05-10 | 0 | Details |
| US1857128A | Electron discharge system | Expired / Lapsed | 1930-03-28 | 1932-05-10 | 0 | Details |
| US1856832A | Circuit controller | Expired / Lapsed | 1930-01-13 | 1932-05-03 | 0 | Details |
| US1853964A | Electric switch | Expired / Lapsed | 1930-03-15 | 1932-04-12 | 0 | Details |
| US1853973A | Centrifugal compressor or blower | Expired / Lapsed | 1928-12-04 | 1932-04-12 | 0 | Details |
| US1853953A | Tuned electrical circuits | Expired / Lapsed | 1928-11-13 | 1932-04-12 | 0 | Details |
| US1853021A | Means for eliminating fading | Expired / Lapsed | 1927-11-15 | 1932-04-12 | 0 | Details |
| US1851721A | Oscillation generator | Expired / Lapsed | 1930-05-22 | 1932-03-29 | 0 | Details |
| US1849818A | Picture transmission | Expired / Lapsed | 1930-09-19 | 1932-03-15 | 0 | Details |
| US1849827A | Telemetric system | Expired / Lapsed | 1927-07-01 | 1932-03-15 | 0 | Details |
| US1849870A | Telemetric system | Expired / Lapsed | 1927-05-26 | 1932-03-15 | 0 | Details |
| US1844375A | Gaseous electric discharge device | Expired / Lapsed | 1931-02-24 | 1932-02-09 | 0 | Details |
| US1844705A | Piezo-electric apparatus | Expired / Lapsed | 1928-05-01 | 1932-02-09 | 0 | Details |
| US1844648A | Carrier current supervisory system | Expired / Lapsed | 1927-03-05 | 1932-02-09 | 0 | Details |
| US1840139A | Electrical coil | Expired / Lapsed | 1929-02-26 | 1932-01-05 | 0 | Details |
| US1836838A | Control of electric switches | Expired / Lapsed | 1927-04-27 | 1931-12-15 | 0 | Details |
| US1836725A | Electrical apparatus | Expired / Lapsed | 1923-02-28 | 1931-12-15 | 0 | Details |
| US1835916A | Circuit controlling means | Expired / Lapsed | 1926-08-02 | 1931-12-08 | 0 | Details |
| US1834898A | Magnetic core | Expired / Lapsed | 1930-05-21 | 1931-12-01 | 0 | Details |
| US1834786A | Electrical control means | Expired / Lapsed | 1930-01-18 | 1931-12-01 | 0 | Details |
| US1834771A | Remote control apparatus | Expired / Lapsed | 1925-01-26 | 1931-12-01 | 0 | Details |
| US1833788A | High frequency electrical apparatus | Expired / Lapsed | 1928-05-18 | 1931-11-24 | 0 | Details |
| US1831555A | Foundry core | Expired / Lapsed | 1930-01-17 | 1931-11-10 | 0 | Details |
| US1827571A | Insulation of electrical apparatus | Expired / Lapsed | 1930-10-08 | 1931-10-13 | 0 | Details |
| US1825514A | Apparatus for measuring direct currents | Expired / Lapsed | 1930-11-29 | 1931-09-29 | 0 | Details |
| US1825551A | Electrical recording | Expired / Lapsed | 1930-06-18 | 1931-09-29 | 0 | Details |
| US1824635A | Synchronization in television and facsimile transmission sy… | Expired / Lapsed | 1930-10-21 | 1931-09-22 | 0 | Details |
| US1821836A | Pick-up device | Expired / Lapsed | 1930-04-07 | 1931-09-01 | 0 | Details |
| US1821787A | Retarding device | Expired / Lapsed | 1929-08-19 | 1931-09-01 | 0 | Details |
| US1821808A | Space discharge device | Expired / Lapsed | 1927-08-31 | 1931-09-01 | 0 | Details |
| US1819868A | Electroresponsive device | Expired / Lapsed | 1924-12-08 | 1931-08-18 | 0 | Details |
| US1818963A | Speed control apparatus | Expired / Lapsed | 1930-10-07 | 1931-08-11 | 0 | Details |
| US1817758A | Phonograph apparatus | Expired / Lapsed | 1929-11-20 | 1931-08-04 | 0 | Details |
| US1817744A | Indicating system | Expired / Lapsed | 1926-05-21 | 1931-08-04 | 0 | Details |
| US1816683A | Filament mounting machine | Expired / Lapsed | 1927-12-30 | 1931-07-28 | 0 | Details |
| US1816737A | Supercharger for internal combustion engines | Expired / Lapsed | 1925-07-27 | 1931-07-28 | 0 | Details |
| US1812816A | Power wrench | Expired / Lapsed | 1930-04-24 | 1931-06-30 | 0 | Details |
| US1809683A | Frequency responsive apparatus | Expired / Lapsed | 1928-10-04 | 1931-06-09 | 0 | Details |
| US1809651A | Combined switch and seat operating means | Expired / Lapsed | 1927-06-27 | 1931-06-09 | 0 | Details |
| US1808522A | Protective regulating means for alternating current rectifi… | Expired / Lapsed | 1928-08-29 | 1931-06-02 | 0 | Details |
| US1807441A | Resistor | Expired / Lapsed | 1928-12-28 | 1931-05-26 | 0 | Details |
| US1806199A | Method and apparatus for comparing radiant energy | Expired / Lapsed | 1928-05-03 | 1931-05-19 | 0 | Details |
| US1805167A | Electric control system | Expired / Lapsed | 1928-06-25 | 1931-05-12 | 0 | Details |
| US1804237A | Composite metal and brazing process therefor | Expired / Lapsed | 1925-10-16 | 1931-05-05 | 0 | Details |
| US1795176A | Capacitance connection to high-voltage lines | Expired / Lapsed | 1928-12-01 | 1931-03-03 | 0 | Details |
| US1792291A | Protective arrangement | Expired / Lapsed | 1929-02-19 | 1931-02-10 | 0 | Details |
| US1792340A | Circuit interrupter | Expired / Lapsed | 1928-06-14 | 1931-02-10 | 0 | Details |
| US1792264A | Transmission of pictures | Expired / Lapsed | 1928-03-26 | 1931-02-10 | 0 | Details |
| US1787300A | Electric-discharge device | Expired / Lapsed | 1927-11-16 | 1930-12-30 | 0 | Details |
| US1786292A | Electric socket | Expired / Lapsed | 1927-07-18 | 1930-12-23 | 0 | Details |
| US1783036A | Control mechanism for centrifugal compressors and method of… | Expired / Lapsed | 1928-03-22 | 1930-11-25 | 0 | Details |
| US1780669A | Frequency-responsive signal-receiving apparatus | Expired / Lapsed | 1925-04-23 | 1930-11-04 | 0 | Details |
| US1776130A | Protection of electric circuits | Expired / Lapsed | 1928-09-19 | 1930-09-16 | 0 | Details |
| US1775525A | Adjustable support | Expired / Lapsed | 1926-08-02 | 1930-09-09 | 0 | Details |
| US1774974A | Power plant | Expired / Lapsed | 1926-07-09 | 1930-09-02 | 0 | Details |
| US1774433A | Regulation of the color of cooked products | Expired / Lapsed | 1927-03-24 | 1930-08-26 | 0 | Details |
| US1774457A | System of illumination | Expired / Lapsed | 1927-03-18 | 1930-08-26 | 0 | Details |
| US1774421A | Receiving apparatus | Expired / Lapsed | 1924-04-25 | 1930-08-26 | 0 | Details |
| US1773613A | High-frequency communication system | Expired / Lapsed | 1927-05-19 | 1930-08-19 | 0 | Details |
| US1771919A | Auto transformer | Expired / Lapsed | 1929-11-07 | 1930-07-29 | 0 | Details |
| US1770805A | Railway signaling system | Expired / Lapsed | 1928-08-09 | 1930-07-15 | 0 | Details |
| US1770804A | Frictionless commutating mechanism | Expired / Lapsed | 1927-08-08 | 1930-07-15 | 0 | Details |
| US1769874A | Condenser and material for dielectric or insulation purposes | Expired / Lapsed | 1925-12-04 | 1930-07-01 | 0 | Details |
| US1768415A | Vacuum gauge | Expired / Lapsed | 1927-04-07 | 1930-06-24 | 0 | Details |
| US1762712A | Glow-tube measuring device | Expired / Lapsed | 1925-08-10 | 1930-06-10 | 0 | Details |
| US1762811A | Electric timing device | Expired / Lapsed | 1925-08-10 | 1930-06-10 | 0 | Details |
| US1760583A | Method and apparatus for treating insulated conductors | Expired / Lapsed | 1926-03-23 | 1930-05-27 | 0 | Details |
| US1758775A | Heat-dissipating device | Expired / Lapsed | 1926-03-27 | 1930-05-13 | 0 | Details |
| US1755975A | Indicator system | Expired / Lapsed | 1927-10-19 | 1930-04-22 | 0 | Details |
| US1752866A | Solenoid winding | Expired / Lapsed | 1928-12-31 | 1930-04-01 | 0 | Details |
| US1747041A | Speed-indicating system | Expired / Lapsed | 1928-10-27 | 1930-02-11 | 0 | Details |
| US1747044A | Circuit-controlling apparatus | Expired / Lapsed | 1926-09-28 | 1930-02-11 | 0 | Details |
| US1746196A | Method and apparatus for electric-arc welding | Expired / Lapsed | 1925-09-05 | 1930-02-04 | 0 | Details |
| US1746207A | Method and apparatus for electric arc welding | Expired / Lapsed | 1924-12-26 | 1930-02-04 | 0 | Details |
| US1743792A | Telemetric transmitter | Expired / Lapsed | 1927-04-20 | 1930-01-14 | 0 | Details |
| US1743795A | Faulty-line-section cut-out | Expired / Lapsed | 1924-08-15 | 1930-01-14 | 0 | Details |
| US1742138A | Temperature-responsive device | Expired / Lapsed | 1924-11-28 | 1929-12-31 | 0 | Details |
| US1740406A | Sound-recording apparatus | Expired / Lapsed | 1928-01-23 | 1929-12-17 | 0 | Details |
| US1734917A | Electric discharge device | Expired / Lapsed | 1928-12-27 | 1929-11-05 | 0 | Details |
| US1732987A | Telemetric summation system | Expired / Lapsed | 1927-03-09 | 1929-10-22 | 0 | Details |
| US1731127A | Signal-control system | Expired / Lapsed | 1926-12-30 | 1929-10-08 | 0 | Details |
| US1728003A | Stroboscope | Expired / Lapsed | 1927-05-19 | 1929-09-10 | 0 | Details |
| US1725662A | Synchronous inductor frequency changer | Expired / Lapsed | 1927-12-24 | 1929-08-20 | 0 | Details |
| US1725692A | Automatic reclosing circuit-breaker system | Expired / Lapsed | 1926-08-11 | 1929-08-20 | 0 | Details |
| US1723911A | System of electrical distribution | Expired / Lapsed | 1927-11-15 | 1929-08-06 | 0 | Details |
| US1721409A | Protective arrangement | Expired / Lapsed | 1927-08-31 | 1929-07-16 | 0 | Details |
| US1718478A | Electric switch | Expired / Lapsed | 1927-05-24 | 1929-06-25 | 0 | Details |
| US1717191A | Time-element electroresponsive device | Expired / Lapsed | 1925-08-15 | 1929-06-11 | 0 | Details |
| US1716752A | Control system | Expired / Lapsed | 1923-02-02 | 1929-06-11 | 0 | Details |
| US1712370A | Electric discharge device | Expired / Lapsed | 1926-04-27 | 1929-05-07 | 0 | Details |
| US1708003A | Welding torch | Expired / Lapsed | 1926-02-20 | 1929-04-09 | 0 | Details |
| US1708884A | Means for reproducing position | Expired / Lapsed | 1925-04-22 | 1929-04-09 | 0 | Details |
| US1706149A | System for transmitting angular motion | Expired / Lapsed | 1926-10-04 | 1929-03-19 | 0 | Details |
| US1706130A | Heat-resisting material | Expired / Lapsed | 1925-09-14 | 1929-03-19 | 0 | Details |
| US1706185A | Transmission of pictures and views | Expired / Lapsed | 1925-05-27 | 1929-03-19 | 0 | Details |
| US1706284A | Jack plug | Expired / Lapsed | 1924-02-21 | 1929-03-19 | 0 | Details |
| US1706158A | Electrical testing apparatus | Expired / Lapsed | 1921-11-07 | 1929-03-19 | 0 | Details |
| US1701352A | Electric switch | Expired / Lapsed | 1926-12-10 | 1929-02-05 | 0 | Details |
| US1701331A | Consistency meter | Expired / Lapsed | 1925-08-26 | 1929-02-05 | 0 | Details |
| US1698325A | Reversing motor-control system | Expired / Lapsed | 1926-05-12 | 1929-01-08 | 0 | Details |
| US1698302A | Coating method | Expired / Lapsed | 1921-04-22 | 1929-01-08 | 0 | Details |
| US1696582A | Electric-switch-operating mechanism | Expired / Lapsed | 1923-08-01 | 1928-12-25 | 0 | Details |
| US1694264A | Temperature regulator | Expired / Lapsed | 1925-06-22 | 1928-12-04 | 0 | Details |
| US1693303A | Electric terminal equipment | Expired / Lapsed | 1927-12-13 | 1928-11-27 | 0 | Details |
| US1693314A | Means for reproducing position | Expired / Lapsed | 1924-07-09 | 1928-11-27 | 0 | Details |
| US1684132A | Means for reproducing position | Expired / Lapsed | 1925-11-30 | 1928-09-11 | 0 | Details |
| US1684138A | Means for reproducing position | Expired / Lapsed | 1925-09-29 | 1928-09-11 | 0 | Details |
| US1680756A | Synchronizing device | Expired / Lapsed | 1926-11-26 | 1928-08-14 | 0 | Details |
| US1680681A | Process of treating silica articles | Expired / Lapsed | 1926-01-21 | 1928-08-14 | 0 | Details |
| US1677000A | Electric discharge device | Expired / Lapsed | 1921-03-05 | 1928-07-10 | 0 | Details |
| US1674488A | Electric heating unit | Expired / Lapsed | 1922-12-20 | 1928-06-19 | 0 | Details |
| US1672671A | Photo-electric photometer | Expired / Lapsed | 1927-01-20 | 1928-06-05 | 0 | Details |
| US1669154A | Protective relay | Expired / Lapsed | 1925-09-14 | 1928-05-08 | 0 | Details |
| US1669112A | Supervisory control system | Expired / Lapsed | 1924-09-15 | 1928-05-08 | 0 | Details |
| US1658713A | Electrical contact | Expired / Lapsed | 1923-10-30 | 1928-02-07 | 0 | Details |
| US1657253A | Connecter for electric conductors | Expired / Lapsed | 1924-09-10 | 1928-01-24 | 0 | Details |
| US1655290A | Machine for treating hollow glass articles | Expired / Lapsed | 1926-04-13 | 1928-01-03 | 0 | Details |
| US1655036A | Control of electric power | Expired / Lapsed | 1925-04-25 | 1928-01-03 | 0 | Details |
| US1650632A | Electrode steam boiler | Expired / Lapsed | 1926-04-13 | 1927-11-29 | 0 | Details |
| US1650626A | System of gunfire control | Expired / Lapsed | 1924-11-29 | 1927-11-29 | 0 | Details |
| US1648680A | Electric-motor control for feed mechanisms | Expired / Lapsed | 1927-01-29 | 1927-11-08 | 0 | Details |
| US1645090A | Bushing-terminal connecter | Expired / Lapsed | 1926-10-02 | 1927-10-11 | 0 | Details |
| US1641673A | Means for measuring the viscosity of fluids | Expired / Lapsed | 1925-12-09 | 1927-09-06 | 0 | Details |
| US1640433A | Insulating element | Expired / Lapsed | 1926-07-20 | 1927-08-30 | 0 | Details |
| US1637852A | Recording instrument | Expired / Lapsed | 1924-09-08 | 1927-08-02 | 0 | Details |
| US1637046A | Decorative lighting outfit | Expired / Lapsed | 1922-04-22 | 1927-07-26 | 0 | Details |
| US1635787A | Method and apparatus for the fatigue testing of material | Expired / Lapsed | 1925-03-14 | 1927-07-12 | 0 | Details |
| US1634979A | Control apparatus | Expired / Lapsed | 1925-11-10 | 1927-07-05 | 0 | Details |
| US1623825A | Bulb-feeding apparatus | Expired / Lapsed | 1925-03-24 | 1927-04-05 | 0 | Details |
| US1618757A | Speed regulator | Expired / Lapsed | 1925-08-26 | 1927-02-22 | 0 | Details |
| US1618800A | Indicating instrument | Expired / Lapsed | 1924-11-12 | 1927-02-22 | 0 | Details |
| US1618117A | Narrow light aperture and method of making the same | Expired / Lapsed | 1926-07-06 | 1927-02-15 | 0 | Details |
| US1617133A | Centrifugal pump and compressor | Expired / Lapsed | 1925-05-23 | 1927-02-08 | 0 | Details |
| US1617145A | Shunt | Expired / Lapsed | 1925-01-06 | 1927-02-08 | 0 | Details |
| US1617161A | Process of preparing metals | Expired / Lapsed | 1923-03-13 | 1927-02-08 | 0 | Details |
| US1615662A | Brush holder | Expired / Lapsed | 1926-03-18 | 1927-01-25 | 0 | Details |
| US1615643A | Ward-leonard drive | Expired / Lapsed | 1925-07-27 | 1927-01-25 | 0 | Details |
| US1615735A | Mirror | Expired / Lapsed | 1923-07-24 | 1927-01-25 | 0 | Details |
| US1615636A | Signaling system | Expired / Lapsed | 1919-06-05 | 1927-01-25 | 0 | Details |
| US1614217A | Flow meter and the like | Expired / Lapsed | 1924-01-26 | 1927-01-11 | 0 | Details |
| US1612120A | System for the transmission of angular motion | Expired / Lapsed | 1921-12-15 | 1926-12-28 | 0 | Details |
| US1612117A | System for the transmission of angular movements | Expired / Lapsed | 1921-09-15 | 1926-12-28 | 0 | Details |
| US1610779A | Signaling apparatus | Expired / Lapsed | 1918-08-27 | 1926-12-14 | 0 | Details |
| US1601926A | Fuse holder | Expired / Lapsed | 1924-05-28 | 1926-10-05 | 0 | Details |
| US1600071A | Bearing for the moving elements of measuring devices and th… | Expired / Lapsed | 1925-03-17 | 1926-09-14 | 0 | Details |
| US1594061A | Corrosion-resisting metal | Expired / Lapsed | 1922-06-19 | 1926-07-27 | 0 | Details |
| US1594069A | Sound-detecting device | Expired / Lapsed | 1919-06-06 | 1926-07-27 | 0 | Details |
| US1576195A | System for transmitting angular motion | Expired / Lapsed | 1925-09-14 | 1926-03-09 | 0 | Details |
| US1576155A | Electromagnet | Expired / Lapsed | 1924-05-24 | 1926-03-09 | 0 | Details |
| US1574648A | Signal system | Expired / Lapsed | 1922-01-28 | 1926-02-23 | 0 | Details |
| US1569845A | Ventilating apparatus | Expired / Lapsed | 1924-05-29 | 1926-01-12 | 0 | Details |
| US1568694A | Photo-electric device | Expired / Lapsed | 1921-04-16 | 1926-01-05 | 0 | Details |
| US1566995A | Oil governor | Expired / Lapsed | 1924-01-14 | 1925-12-22 | 0 | Details |
| US1566879A | Metering system | Expired / Lapsed | 1922-03-07 | 1925-12-22 | 0 | Details |
| US1564804A | Temperature-control device | Expired / Lapsed | 1925-04-16 | 1925-12-08 | 0 | Details |
| US1564788A | System for the transmission of angular motion | Expired / Lapsed | 1922-06-16 | 1925-12-08 | 0 | Details |
| US1561001A | Electric oscillator | Expired / Lapsed | 1921-02-07 | 1925-11-10 | 0 | Details |
| US1559525A | Means for reproducing position | Expired / Lapsed | 1921-12-16 | 1925-10-27 | 0 | Details |
| US1559110A | Motor controller | Expired / Lapsed | 1921-04-25 | 1925-10-27 | 0 | Details |
| US1554698A | Surge preventer | Expired / Lapsed | 1923-12-22 | 1925-09-22 | 0 | Details |
| US1554674A | Control system | Expired / Lapsed | 1923-11-02 | 1925-09-22 | 0 | Details |
| US1554980A | Method of and means for calibrating instruments for the tra… | Expired / Lapsed | 1923-06-21 | 1925-09-22 | 0 | Details |
| US1551512A | Limit switch | Expired / Lapsed | 1925-02-02 | 1925-08-25 | 0 | Details |
| US1551393A | Position indicator | Expired / Lapsed | 1921-09-15 | 1925-08-25 | 0 | Details |
| US1550197A | Radiation projector | Expired / Lapsed | 1923-06-06 | 1925-08-18 | 0 | Details |
| US1550155A | Thermally-controlled apparatus | Expired / Lapsed | 1923-05-17 | 1925-08-18 | 0 | Details |
| US1549477A | Decreasing cross-talk in phantom circuits | Expired / Lapsed | 1923-07-02 | 1925-08-11 | 0 | Details |
| US1549456A | Electric discharge indicator | Expired / Lapsed | 1922-02-11 | 1925-08-11 | 0 | Details |
| US1548698A | Telephone transmitter and receiver, loud-speaking telephone… | Expired / Lapsed | 1924-09-10 | 1925-08-04 | 0 | Details |
| US1548799A | Electric switch | Expired / Lapsed | 1921-08-10 | 1925-08-04 | 0 | Details |
| US1547154A | Amplifying apparatus | Expired / Lapsed | 1924-08-15 | 1925-07-21 | 0 | Details |
| US1546264A | Radiation-measuring device | Expired / Lapsed | 1921-12-31 | 1925-07-14 | 0 | Details |
| US1541641A | Manufacture of laminated material from spinnable textile wo… | Expired / Lapsed | 1924-04-08 | 1925-06-09 | 0 | Details |
| US1541600A | Method of and means for operating electric furnaces | Expired / Lapsed | 1923-05-11 | 1925-06-09 | 0 | Details |
| US1531917A | Electric switch | Expired / Lapsed | 1922-11-11 | 1925-03-31 | 0 | Details |
| US1532002A | Composite quartz body | Expired / Lapsed | 1922-10-30 | 1925-03-31 | 0 | Details |
| US1530374A | Metal coating | Expired / Lapsed | 1922-10-12 | 1925-03-17 | 0 | Details |
| US1530249A | Turbine bucket | Expired / Lapsed | 1922-09-23 | 1925-03-17 | 0 | Details |
| US1523778A | Electron device and method of operating | Expired / Lapsed | 1921-11-15 | 1925-01-20 | 0 | Details |
| US1518683A | Signaling system | Expired / Lapsed | 1923-11-06 | 1924-12-09 | 0 | Details |
| US1516607A | Hollow turbine bucket and method of manufacturing same | Expired / Lapsed | 1923-07-30 | 1924-11-25 | 0 | Details |
| US1512200A | Fluorescent screen | Expired / Lapsed | 1920-09-27 | 1924-10-21 | 0 | Details |
| US1511050A | Temperature regulator | Expired / Lapsed | 1922-02-20 | 1924-10-07 | 0 | Details |
| US1508707A | Control mechanism for aeroplane superchargers | Expired / Lapsed | 1922-04-08 | 1924-09-16 | 0 | Details |
| US1506443A | Temperature regulator | Expired / Lapsed | 1922-02-25 | 1924-08-26 | 0 | Details |
| US1501886A | Gyroscopic navigation instrument | Expired / Lapsed | 1921-10-27 | 1924-07-15 | 0 | Details |
| US1501708A | Controller finger | Expired / Lapsed | 1921-10-07 | 1924-07-15 | 0 | Details |
| US1501017A | Protective device | Expired / Lapsed | 1919-11-28 | 1924-07-08 | 0 | Details |
| US1498908A | Evacuated container | Expired / Lapsed | 1915-01-23 | 1924-06-24 | 0 | Details |
| US1493306A | Quick-release valve coupling | Expired / Lapsed | 1921-03-17 | 1924-05-06 | 0 | Details |
| US1485727A | Voltage boosting or bucking system | Expired / Lapsed | 1920-09-20 | 1924-03-04 | 0 | Details |
| US1483433A | Relay | Expired / Lapsed | 1921-09-24 | 1924-02-12 | 0 | Details |
| US1479663A | Relay and the like | Expired / Lapsed | 1920-02-16 | 1924-01-01 | 0 | Details |
| US1477367A | Electric register | Expired / Lapsed | 1920-03-01 | 1923-12-11 | 0 | Details |
| US1475583A | Variable-current generator | Expired / Lapsed | 1921-05-20 | 1923-11-27 | 0 | Details |
| US1470506A | Method of manufacturing turbine elements | Expired / Lapsed | 1921-12-23 | 1923-10-09 | 0 | Details |
| US1466293A | Rheostat | Expired / Lapsed | 1921-12-27 | 1923-08-28 | 0 | Details |
| US1462350A | Electric steam boiler | Expired / Lapsed | 1922-02-15 | 1923-07-17 | 0 | Details |
| US1450464A | Crystal formation | Expired / Lapsed | 1920-07-26 | 1923-04-03 | 0 | Details |
| US1444438A | Electrode structure | Expired / Lapsed | 1918-08-07 | 1923-02-06 | 0 | Details |
| US1441532A | Electrical apparatus | Expired / Lapsed | 1920-07-01 | 1923-01-09 | 0 | Details |
| US1426921A | Electrical apparatus | Expired / Lapsed | 1919-05-06 | 1922-08-22 | 0 | Details |
| US1424027A | Electromagnetic clutch and reversing mechanism | Expired / Lapsed | 1920-01-15 | 1922-07-25 | 0 | Details |
| US1406507A | Recorder | Expired / Lapsed | 1919-09-09 | 1922-02-14 | 0 | Details |
| US1394144A | Incandescent-cathode apparatus | Expired / Lapsed | 1919-10-24 | 1921-10-18 | 0 | Details |
| US1390243A | Method of welding low-melting-point metals and alloys to hi… | Expired / Lapsed | 1919-09-15 | 1921-09-06 | 0 | Details |
| US1380981A | Telephone | Expired / Lapsed | 1917-04-21 | 1921-06-07 | 0 | Details |
| US1379526A | Temperature-indicator for transformers and the like | Expired / Lapsed | 1918-05-25 | 1921-05-24 | 0 | Details |
| US1357710A | Method of and apparatus for automatically removing gases | Expired / Lapsed | 1918-11-29 | 1920-11-02 | 0 | Details |
| US1353656A | Fluid-operated motor | Expired / Lapsed | 1920-02-24 | 1920-09-21 | 0 | Details |
| US1301636A | High-voltage-current transformer. | Expired / Lapsed | 1916-10-28 | 1919-04-22 | 0 | Details |
| US1301079A | Incandescent lamp. | Expired / Lapsed | 1918-06-15 | 1919-04-15 | 0 | Details |
| US1300068A | Welding-electrode. | Expired / Lapsed | 1918-05-07 | 1919-04-08 | 0 | Details |
| US1291106A | Electrical resistance. | Expired / Lapsed | 1917-11-21 | 1919-01-14 | 0 | Details |
| US1291056A | Flow-meter. | Expired / Lapsed | 1916-08-10 | 1919-01-14 | 0 | Details |
| US1289823A | Electric-discharge-controlling device and method of operati… | Expired / Lapsed | 1914-11-06 | 1918-12-31 | 0 | Details |
| US1281216A | Method of and means for preventing pulsations in centrifuga… | Expired / Lapsed | 1917-02-02 | 1918-10-08 | 0 | Details |
| US1276589A | Thermoregulator. | Expired / Lapsed | 1917-06-26 | 1918-08-20 | 0 | Details |
| US1273661A | Interlocking control for mine-hoists. | Expired / Lapsed | 1918-03-25 | 1918-07-23 | 0 | Details |
| US1273346A | Manufacture of glass rods and tubes. | Expired / Lapsed | 1916-07-20 | 1918-07-23 | 0 | Details |
| US1271407A | Protective device. | Expired / Lapsed | 1915-01-11 | 1918-07-02 | 0 | Details |
| US1269481A | Protective device. | Expired / Lapsed | 1916-08-01 | 1918-06-11 | 0 | Details |
| US1269537A | Dynamo-electric machine. | Expired / Lapsed | 1916-01-08 | 1918-06-11 | 0 | Details |
| US1267214A | Position indicator or recorder. | Expired / Lapsed | 1916-06-15 | 1918-05-21 | 0 | Details |
| US1253166A | Electrical winding. | Expired / Lapsed | 1917-03-27 | 1918-01-08 | 0 | Details |
| US1244217A | Electron-discharge apparatus and method of operating the sa… | Expired / Lapsed | 1915-10-28 | 1917-10-23 | 0 | Details |
| US1233807A | Method of making insulated wires. | Expired / Lapsed | 1914-01-03 | 1917-07-17 | 0 | Details |
| US1230004A | Incandescent cathode device. | Expired / Lapsed | 1915-09-18 | 1917-06-12 | 0 | Details |
| US1226470A | Refractory-metal tube. | Expired / Lapsed | 1915-02-20 | 1917-05-15 | 0 | Details |
| US1213844A | Protective device. | Expired / Lapsed | 1912-05-02 | 1917-01-30 | 0 | Details |
| US1200233A | Electrical apparatus. | Expired / Lapsed | 1914-12-30 | 1916-10-03 | 0 | Details |
| US1192706A | X-ray tube. | Expired / Lapsed | 1914-09-14 | 1916-07-25 | 0 | Details |
| US1190060A | Electric switch. | Expired / Lapsed | 1913-06-04 | 1916-07-04 | 0 | Details |
| US1163329A | Filament for incandescent electric lamps. | Expired / Lapsed | 1907-05-31 | 1915-12-07 | 0 | Details |
| US1156630A | Method of and means for measuring the flow of fluids. | Expired / Lapsed | 1915-04-29 | 1915-10-12 | 0 | Details |
| US1156660A | Method and apparatus for measuring the flow of fluids. | Expired / Lapsed | 1914-04-22 | 1915-10-12 | 0 | Details |
| US1156491A | Frequency-indicator. | Expired / Lapsed | 1912-07-13 | 1915-10-12 | 0 | Details |
| US1154591A | Automatic feed-water regulator. | Expired / Lapsed | 1912-02-12 | 1915-09-21 | 0 | Details |
| US1144029A | Protective device. | Expired / Lapsed | 1914-01-05 | 1915-06-22 | 0 | Details |
| US1128081A | Electric heating device. | Expired / Lapsed | 1912-06-15 | 1915-02-09 | 0 | Details |
| US1128008A | Alternating-current indicator. | Expired / Lapsed | 1909-07-12 | 1915-02-09 | 0 | Details |
| US1121979A | Thermo-electric regulator. | Expired / Lapsed | 1913-10-15 | 1914-12-22 | 0 | Details |
| US1121960A | Molded metallic article and method of making the same. | Expired / Lapsed | 1910-10-12 | 1914-12-22 | 0 | Details |
| US1119713A | Centrifugal air-compressor. | Expired / Lapsed | 1910-08-17 | 1914-12-01 | 0 | Details |
| US1118446A | Insulating-coil. | Expired / Lapsed | 1912-09-17 | 1914-11-24 | 0 | Details |
| US1114564A | Cooling device for revolving motors. | Expired / Lapsed | 1912-01-31 | 1914-10-20 | 0 | Details |
| US1109235A | Control system. | Expired / Lapsed | — | 1914-09-01 | 0 | Details |
| US1102116A | Dynamo-electric machine. | Expired / Lapsed | 1913-04-26 | 1914-06-30 | 0 | Details |
| US1101821A | Electric heating device. | Expired / Lapsed | 1912-06-07 | 1914-06-30 | 0 | Details |
| US1100708A | Electric-current shunt. | Expired / Lapsed | 1912-11-04 | 1914-06-23 | 0 | Details |
| US1096142A | Ethereal-wave-responsive device. | Expired / Lapsed | 1912-11-09 | 1914-05-12 | 0 | Details |
| US1094733A | Electric regulator. | Expired / Lapsed | — | 1914-04-28 | 0 | Details |
| US1091563A | Vapor electric apparatus. | Expired / Lapsed | 1904-04-04 | 1914-03-31 | 0 | Details |
| US1077818A | Detector for printing-presses or the like. | Expired / Lapsed | 1912-07-05 | 1913-11-04 | 0 | Details |
| US1042693A | Motor-control system. | Expired / Lapsed | 1912-06-03 | 1912-10-29 | 0 | Details |
| US1041512A | Combined step and guide bearing for turbines. | Expired / Lapsed | 1907-03-06 | 1912-10-15 | 0 | Details |
| US1031710A | Process of connecting filaments and feed-wires for electric… | Expired / Lapsed | 1909-08-28 | 1912-07-09 | 0 | Details |
| US1028092A | Fixture for vacuum-tube lamps. | Expired / Lapsed | 1907-02-26 | 1912-05-28 | 0 | Details |
| US1025809A | Fluid-flow measuring or regulating device. | Expired / Lapsed | 1910-09-08 | 1912-05-07 | 0 | Details |
| US1022001A | Electrically-controlled brake. | Expired / Lapsed | 1908-10-16 | 1912-04-02 | 0 | Details |
| US1021256A | Resistance. | Expired / Lapsed | 1910-01-07 | 1912-03-26 | 0 | Details |
| US1020701A | Centrifugal pump for abstracting air and water from surface… | Expired / Lapsed | 1909-09-02 | 1912-03-19 | 0 | Details |
| US1019467A | Controller for electric circuits. | Expired / Lapsed | 1909-03-15 | 1912-03-05 | 0 | Details |
| US1017571A | Governor. | Expired / Lapsed | 1910-06-29 | 1912-02-13 | 0 | Details |
| US1017509A | Governing mechanism for centrifugal apparatus. | Expired / Lapsed | 1909-05-20 | 1912-02-13 | 0 | Details |
| US1008588A | Filament. | Expired / Lapsed | 1906-08-01 | 1911-11-14 | 0 | Details |
| US1001710A | System of electrical distribution. | Expired / Lapsed | 1905-03-11 | 1911-08-29 | 0 | Details |
| US982165A | Bearing and bearing-box. | Expired / Lapsed | 1904-11-04 | 1911-01-17 | 0 | Details |
| US974161A | Heating system. | Expired / Lapsed | 1910-05-10 | 1910-11-01 | 0 | Details |
| US957242A | Dynamo-electric machine. | Expired / Lapsed | 1908-04-13 | 1910-05-10 | 0 | Details |
| US929371A | Asymmetric cell. | Expired / Lapsed | 1908-03-18 | 1909-07-27 | 0 | Details |
| US922556A | Insulating-joint. | Expired / Lapsed | 1908-09-28 | 1909-05-25 | 0 | Details |
| US905478A | Incandescent lamp. | Expired / Lapsed | 1905-06-07 | 1908-12-01 | 0 | Details |
| US904808A | Insulating material. | Expired / Lapsed | 1907-08-07 | 1908-11-24 | 0 | Details |
| US897497A | Starting and speed-regulating rheostat. | Expired / Lapsed | 1908-01-25 | 1908-09-01 | 0 | Details |
| US883888A | Air or gas compressor system. | Expired / Lapsed | 1907-04-10 | 1908-04-07 | 0 | Details |
| US883944A | Electric lighting. | Expired / Lapsed | 1904-12-08 | 1908-04-07 | 0 | Details |
| US840150A | Transformer. | Expired / Lapsed | 1901-12-16 | 1907-01-01 | 0 | Details |
| US835322A | Electric measuring instrument. | Expired / Lapsed | 1904-05-24 | 1906-11-06 | 0 | Details |
| US831404A | Controlling-switch. | Expired / Lapsed | 1905-02-23 | 1906-09-18 | 0 | Details |
| US812880A | Switch or circuit-breaker for high-potential circuits. | Expired / Lapsed | 1899-12-30 | 1906-02-20 | 0 | Details |
| US798391A | Motor-driven machine-tool. | Expired / Lapsed | 1903-04-09 | 1905-08-29 | 0 | Details |
| US769646A | Connection-box. | Expired / Lapsed | 1903-02-20 | 1904-09-06 | 0 | Details |
| US735621A | Electrostatic motor. | Expired / Lapsed | 1901-03-25 | 1903-08-04 | 0 | Details |
| US716131A | Electric regulator. | Expired / Lapsed | 1902-03-24 | 1902-12-16 | 0 | Details |
| US715545A | Generating alternating currents. | Expired / Lapsed | 1896-06-22 | 1902-12-09 | 0 | Details |
| US706554A | Speed-indicating system. | Expired / Lapsed | 1901-11-29 | 1902-08-12 | 0 | Details |
| US706575A | Multirate-metering system. | Expired / Lapsed | 1901-01-31 | 1902-08-12 | 0 | Details |
| US701937A | Indicating instrument. | Expired / Lapsed | 1899-11-20 | 1902-06-10 | 0 | Details |
| US660801A | Electrically-operated-machine-tool. | Expired / Lapsed | 1900-08-30 | 1900-10-30 | 0 | Details |
| US654130A | Electric steering-gear. | Expired / Lapsed | 1899-03-20 | 1900-07-24 | 0 | Details |