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Westinghouse Electric Corp

Westinghou
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Patent No. Title Status Filing Date Grant Date Claims Actions
GB1497158A System and method for programmable sequence control Expired / Lapsed 1975-05-19 — 0 Details
GB1123117A Electric field device Expired / Lapsed 1966-06-08 — 0 Details
DE1121167B Arrangement for controlling an alternating current power by… Expired / Lapsed 1960-11-18 — 0 Details
DE1091910B Fault indicator Expired / Lapsed 1958-01-11 — 0 Details
DE1058615B Device for controlling the supply of a load from an alterna… Expired / Lapsed 1955-07-02 — 0 Details
US4926364A Method and apparatus for determining weighted average of pr… Expired / Lapsed 1988-07-25 1990-05-15 19 Details
US4808063A Robot system employing force/position control Expired / Lapsed 1987-11-03 1989-02-28 11 Details
US4711760A Nuclear reactor incorporating locking device for threaded b… Expired / Lapsed 1986-02-27 1987-12-08 21 Details
US4695156A Range finding method and apparatus Expired / Lapsed 1986-07-03 1987-09-22 22 Details
US4693045A Exhaust stack support arrangement Expired / Lapsed 1985-07-30 1987-09-15 3 Details
US4628464A Robotic system for mounting electrical components Expired / Lapsed 1986-02-25 1986-12-09 10 Details
US4500060A Swivel-tilt platform Expired / Lapsed 1982-06-11 1985-02-19 9 Details
US4497065A Target recognition system enhanced by active signature meas… Expired / Lapsed 1982-07-12 1985-01-29 12 Details
US4417248A Adaptive collision threat assessor Expired / Lapsed 1981-06-30 1983-11-22 11 Details
US4408495A Fiber optic system for measuring mechanical motion or vibra… Expired / Lapsed 1981-10-02 1983-10-11 7 Details
US4402055A Automatic test system utilizing interchangeable test devices Expired / Lapsed 1981-01-27 1983-08-30 11 Details
US4402054A Method and apparatus for the automatic diagnosis of system … Expired / Lapsed 1980-10-15 1983-08-30 9 Details
US4398863A Pick and place robot Expired / Lapsed 1981-05-15 1983-08-16 2 Details
US4397021A Multi-processor automatic test system Expired / Lapsed 1981-06-15 1983-08-02 12 Details
US4396903A Electro-optical system for correlating and integrating imag… Expired / Lapsed 1981-05-29 1983-08-02 14 Details
US4352156A AC to AC Power converter with a controllable power factor Expired / Lapsed 1981-08-14 1982-09-28 16 Details
EP0004696B1 Ultra high vacuum seal arrangement Expired / Lapsed 1979-01-15 1982-06-30 9 Details
US4179742A System for intelligently selecting the mode of control of a… Expired / Lapsed 1978-04-06 1979-12-18 11 Details
US4166221A Overspeed protection controller employing interceptor valve… Expired / Lapsed 1978-02-09 1979-08-28 11 Details
US4153331A Fiber optic interface junction assembly Expired / Lapsed 1977-05-24 1979-05-08 8 Details
US4148029A System for estimating acceleration of maneuvering targets Expired / Lapsed 1976-10-13 1979-04-03 13 Details
US4130864A Priority selection circuit for multiported central function… Expired / Lapsed 1976-10-29 1978-12-19 6 Details
US4099591A Vehicle control scanning system Expired / Lapsed 1976-09-02 1978-07-11 10 Details
US4099069A Circuit producing a common clear signal for erasing selecte… Expired / Lapsed 1976-10-08 1978-07-04 16 Details
US4084262A Digital monitor having memory readout by the monitored syst… Expired / Lapsed 1976-05-28 1978-04-11 8 Details
US4072818A System for converting tonal images to line drawings Expired / Lapsed 1975-06-10 1978-02-07 8 Details
US4063200A Hybrid multiplexed filter Expired / Lapsed 1976-02-10 1977-12-13 11 Details
US4029952A Electric power plant having a multiple computer system for … Expired / Lapsed 1973-11-06 1977-06-14 38 Details
US4017056A Servo control system for electro-hydraulic inlet valves Expired / Lapsed 1976-02-23 1977-04-12 14 Details
US4014026A Power operated antenna assembly Expired / Lapsed 1975-11-25 1977-03-22 4 Details
US4008685A Electrostatic fluidized bed build control Expired / Lapsed 1976-04-20 1977-02-22 6 Details
US4001766A Acoustic lens system Expired / Lapsed 1975-02-26 1977-01-04 8 Details
US3992681A Method and means for controlling population inversion and e… Expired / Lapsed 1973-08-01 1976-11-16 14 Details
US3991361A Semi-automatic compass calibrator apparatus for a vehicle m… Expired / Lapsed 1975-03-27 1976-11-09 12 Details
US3989589A Hydraulic drive for control rods Expired / Lapsed 1973-06-06 1976-11-02 13 Details
US3956655A Ultraviolet radiation source Expired / Lapsed 1974-12-23 1976-05-11 6 Details
US3936217A Inspection port for turbines Expired / Lapsed 1975-01-31 1976-02-03 6 Details
US3932735A Method of controlling supply of power Expired / Lapsed 1972-02-03 1976-01-13 73 Details
US3925645A System and method for transferring between boiler-turbine p… Expired / Lapsed 1975-03-07 1975-12-09 20 Details
US3925577A Silicon carbide coated graphite members and process for pro… Expired / Lapsed 1972-11-24 1975-12-09 7 Details
US3922907A In-bore turbine inspection device Expired / Lapsed 1974-06-12 1975-12-02 15 Details
US3924235A Digital antenna positioning system and method Expired / Lapsed 1973-10-23 1975-12-02 9 Details
US3921139A Test system having memory means at test module Expired / Lapsed 1974-03-08 1975-11-18 6 Details
US3920973A Method and system for testing signal transmission paths Expired / Lapsed 1973-01-09 1975-11-18 16 Details
US3919533A Electrical fault indicator Expired / Lapsed 1974-11-08 1975-11-11 16 Details
US3909520A Readout system for a solid-state television camera Expired / Lapsed 1972-02-29 1975-09-30 6 Details
US3906391A Linear period thermistor temperature oscillator Expired / Lapsed 1974-06-14 1975-09-16 5 Details
US3898441A Multiple computer system for operating a power plant turbin… Expired / Lapsed 1973-11-06 1975-08-05 23 Details
US3892934A Auxiliary contact interlock for preventing electrical disco… Expired / Lapsed 1974-03-14 1975-07-01 5 Details
US3893090A Position indication system Expired / Lapsed 1973-01-03 1975-07-01 6 Details
US3886310A Electrostatically deflectable light valve with improved dif… Expired / Lapsed 1973-08-22 1975-05-27 14 Details
US3878327A Television system for improving reading skills Expired / Lapsed 1973-10-17 1975-04-15 12 Details
US3873817A On-line monitoring of steam turbine performance Expired / Lapsed 1972-05-04 1975-03-25 30 Details
US3872286A Control system and method for limiting power demand of an i… Expired / Lapsed 1973-10-12 1975-03-18 4 Details
US3868508A Contactless infrared diagnostic test system Expired / Lapsed 1973-10-30 1975-02-25 11 Details
US3856378A Method and means for modulating light propagating in an opt… Expired / Lapsed 1973-02-28 1974-12-24 17 Details
US3854821A Optical system for wide band light energy Expired / Lapsed 1971-10-29 1974-12-17 3 Details
US3849740A Integrated optical and/or gate Expired / Lapsed 1973-05-01 1974-11-19 10 Details
US3845657A Surveillance system including means for detecting impending… Expired / Lapsed 1972-02-04 1974-11-05 9 Details
US3829232A System and method for operating a steam turbine with dual h… Expired / Lapsed 1971-10-14 1974-08-13 12 Details
US3805234A Digital data transmission system Expired / Lapsed 1972-07-31 1974-04-16 14 Details
US3797017A Digital mti radar system Expired / Lapsed 1972-10-05 1974-03-12 31 Details
US3793631A Digital computer apparatus operative with jump instructions Expired / Lapsed 1972-09-22 1974-02-19 9 Details
US3789137A Time compression of audio signals Expired / Lapsed 1972-04-07 1974-01-29 16 Details
US3754233A Digital-to-analog conversion apparatus and method Expired / Lapsed 1971-11-19 1973-08-21 12 Details
US3743423A Intensity spatial filter having uniformly spaced filter ele… Expired / Lapsed 1972-05-03 1973-07-03 9 Details
US3742499A Pulse doppler moving-target radar Expired / Lapsed 1971-05-25 1973-06-26 12 Details
US3741246A Steam turbine system with digital computer position control… Expired / Lapsed 1970-10-14 1973-06-26 15 Details
US3735032A Television pick-up tube device Expired / Lapsed 1969-04-09 1973-05-22 25 Details
US3733587A Universal buffer interface for computer controlled test sys… Expired / Lapsed 1971-05-10 1973-05-15 9 Details
US3697997A Interferometer and angle encoding navigation system Expired / Lapsed 1970-10-13 1972-10-10 11 Details
US3689224A Chemical contaminant detection sampler Expired / Lapsed 1966-04-13 1972-09-05 0 Details
AU447511B2 Improvements in or relating to ultrasonic flowmeter systems Expired / Lapsed 1971-02-17 1972-08-24 1 Details
US3686564A Multiple frequency magnetic field technique for differentia… Expired / Lapsed 1970-10-08 1972-08-22 20 Details
US3680984A Compressor combined flexible and magnetic drive coupling Expired / Lapsed 1971-07-23 1972-08-01 10 Details
US3679497A Electron beam fabrication system and process for use thereof Expired / Lapsed 1969-10-24 1972-07-25 0 Details
US3663806A Apparatus for calculating and displaying dynamic coil param… Expired / Lapsed 1971-02-03 1972-05-16 11 Details
US3653014A Signal variation enhancement system Expired / Lapsed 1969-12-24 1972-03-28 11 Details
US3646179A Process for preparing high pressure cellulose acetate semip… Expired / Lapsed 1969-05-22 1972-02-29 0 Details
US3643437A Overspeed protection system for a steam turbine generator Expired / Lapsed 1969-10-16 1972-02-22 36 Details
US3638188A Classification method and apparatus for pattern recognition… Expired / Lapsed 1969-10-17 1972-01-25 15 Details
US3636513A Preprocessing method and apparatus for pattern recognition Expired / Lapsed 1969-10-17 1972-01-18 25 Details
US3633217A Electromagnetic energy converter for pulsing an implantable… Expired / Lapsed 1969-07-01 1972-01-11 14 Details
US3634625A Speech unscrambler Expired / Lapsed 1968-09-23 1972-01-11 13 Details
US3627408A Electric field device Expired / Lapsed 1965-06-29 1971-12-14 40 Details
US3602826A Adaptive signal detection system Expired / Lapsed 1969-12-24 1971-08-31 16 Details
US3600257A Lightweight mirror structures Expired / Lapsed 1969-01-09 1971-08-17 0 Details
US3599179A Fault detection and isolation in computer input-output devi… Expired / Lapsed 1969-05-28 1971-08-10 23 Details
US3593022A Control of a vehicle along a path divided into a plurality … Expired / Lapsed 1968-09-25 1971-07-13 25 Details
US3590339A Gate controlled switch transistor drive integrated circuit … Expired / Lapsed 1970-01-30 1971-06-29 11 Details
US3589134A Manipulator apparatus Expired / Lapsed 1969-10-30 1971-06-29 9 Details
US3590331A Panel mounted switch enclosure Expired / Lapsed 1969-06-02 1971-06-29 12 Details
US3583515A Load-compensated vehicle steering wheel apparatus Expired / Lapsed 1969-02-26 1971-06-08 8 Details
US3584270A High speed switching rectifier Expired / Lapsed 1968-03-13 1971-06-08 8 Details
US3555345A Radiation pickup device incorporating electron multiplicati… Expired / Lapsed 1969-04-24 1971-01-12 9 Details
US3555113A Blends of polymeric amide-imide-ester wire enamels and cond… Expired / Lapsed 1968-05-21 1971-01-12 0 Details
US3552872A Computer positioning control system with manual backup cont… Expired / Lapsed 1969-04-14 1971-01-05 0 Details
US3553593A Pulse width measuring circuit Expired / Lapsed 1968-01-10 1971-01-05 0 Details
US3544766A Time proportional firing circuit Expired / Lapsed 1968-07-29 1970-12-01 0 Details
US3544973A Variable structure computer Expired / Lapsed 1968-03-13 1970-12-01 0 Details
US3534143A Computer control of metal treatment furnace operation Expired / Lapsed 1968-10-25 1970-10-13 0 Details
US3533850A Antireflective coatings for solar cells Expired / Lapsed 1965-10-13 1970-10-13 0 Details
US3532877A Railway track signalling system Expired / Lapsed 1967-11-29 1970-10-06 0 Details
US3530401A Laser scanning system Expired / Lapsed 1966-10-17 1970-09-22 2 Details
US3527991A Servomotor control system in which gain is varied in respon… Expired / Lapsed 1968-06-27 1970-09-08 0 Details
US3522664A Interface device and display system Expired / Lapsed 1967-11-20 1970-08-04 0 Details
US3518857A Rolling mill automatic slowdown control Expired / Lapsed 1967-09-28 1970-07-07 0 Details
US3513471A Angle sensing system Expired / Lapsed 1967-10-26 1970-05-19 0 Details
US3512013A Frequency sensing circuit Expired / Lapsed 1966-09-09 1970-05-12 0 Details
US3504300A Fluorapatite laser material doped with neodymium and mangan… Expired / Lapsed 1966-10-03 1970-03-31 0 Details
US3497726A Firing circuits for series-connected thyristors Expired / Lapsed 1966-12-19 1970-02-24 0 Details
US3495232A Display screen and switching matrix Expired / Lapsed 1966-10-07 1970-02-10 0 Details
US3491282A Static inverter wherein a plurality of square waves are so … Expired / Lapsed 1961-06-19 1970-01-20 1 Details
US3483446A Semiconductor integrated circuit including a bidirectional … Expired / Lapsed 1967-06-15 1969-12-09 0 Details
US3476933A Large-celled polyurethane foam Expired / Lapsed 1966-10-21 1969-11-04 0 Details
US3474342A Signal translation system Expired / Lapsed 1966-07-08 1969-10-21 0 Details
US3469114A Electronic switch and control circuit therefor Expired / Lapsed 1965-11-19 1969-09-23 0 Details
US3460060A Navigation system Expired / Lapsed 1966-08-15 1969-08-05 0 Details
US3460006A Semiconductor integrated circuits with improved isolation Expired / Lapsed 1966-02-28 1969-08-05 0 Details
US3451042A Redundant signal transmission system Expired / Lapsed 1964-10-14 1969-06-17 0 Details
US3448344A Mosaic of semiconductor elements interconnected in an xy ma… Expired / Lapsed 1966-03-15 1969-06-03 0 Details
US3444399A Temperature controlled electronic devices Expired / Lapsed 1965-09-24 1969-05-13 0 Details
US3440521A Temperature control means Expired / Lapsed 1967-01-23 1969-04-22 0 Details
US3433893A Cast electrical bushing Expired / Lapsed 1967-06-12 1969-03-18 0 Details
US3432851A Signal processor Expired / Lapsed 1966-12-22 1969-03-11 0 Details
US3422965A Manipulator apparatus Expired / Lapsed 1967-02-13 1969-01-21 0 Details
US3417397A Signal detection integration and level sensing system using… Expired / Lapsed 1967-04-21 1968-12-17 0 Details
US3415991A Display device utilizing magnetic memory elements for distr… Expired / Lapsed 1965-06-29 1968-12-10 0 Details
US3411200A Fabrication of semiconductor integrated circuits Expired / Lapsed 1965-04-14 1968-11-19 0 Details
US3410263A Blood-pumping apparatus provided with heart synchronizing m… Expired / Lapsed 1965-05-13 1968-11-12 0 Details
US3401325A Speed regulating system providing slowdown control for a mo… Expired / Lapsed 1966-04-25 1968-09-10 2 Details
US3398349A Encased high voltage electrical converter of the semiconduc… Expired / Lapsed 1965-10-20 1968-08-20 0 Details
US3393381A Iterative light frequency modulator Expired / Lapsed 1965-01-21 1968-07-16 0 Details
US3391311A Constant current gain composite transistor Expired / Lapsed 1966-02-07 1968-07-02 2 Details
US3391035A Method of making p-nu-junction devices by diffusion Expired / Lapsed 1965-08-20 1968-07-02 0 Details
US3391297A Photoconductive target having arsenicselenium layers of dif… Expired / Lapsed 1965-03-29 1968-07-02 0 Details
US3386027A High voltage converter apparatus having a plurality of seri… Expired / Lapsed 1965-09-08 1968-05-28 0 Details
US3380615A Refrigeration apparatus cabinet construction Expired / Lapsed 1965-11-17 1968-04-30 0 Details
US3380153A Method of forming a semiconductor integrated circuit that i… Expired / Lapsed 1965-09-30 1968-04-30 2 Details
US3378780A Transistor amplifier Expired / Lapsed 1964-10-07 1968-04-16 0 Details
US3376660A Circulatory system simulator Expired / Lapsed 1965-07-12 1968-04-09 0 Details
US3372740A Lighting luminaire which is liquid cooled Expired / Lapsed 1966-01-12 1968-03-12 2 Details
US3364472A Computation unit Expired / Lapsed 1964-03-06 1968-01-16 2 Details
US3364367A Solid state electron multiplier including reverse-biased, d… Expired / Lapsed 1963-12-12 1968-01-16 2 Details
US3348114A Motor drive apparatus with dynamic braking Expired / Lapsed 1964-05-11 1967-10-17 2 Details
US3343255A Structures for semiconductor integrated circuits and method… Expired / Lapsed 1965-06-14 1967-09-26 2 Details
US3343030A Bar graph oscilloscope display Expired / Lapsed 1964-07-31 1967-09-19 2 Details
US3339079A Load demand program control Expired / Lapsed 1964-07-01 1967-08-29 2 Details
US3335341A Diode structure in semiconductor integrated circuit and met… Expired / Lapsed 1964-03-06 1967-08-08 2 Details
US3325706A Power transistor Expired / Lapsed 1964-10-01 1967-06-13 1 Details
FR1484584A Electric field indicating device Expired / Lapsed 1966-06-27 1967-06-09 0 Details
US3312882A Transistor structure and method of making, suitable for int… Expired / Lapsed 1964-06-25 1967-04-04 2 Details
US3312965A Supervisory apparatus Expired / Lapsed 1964-05-07 1967-04-04 2 Details
US3312943A Computer organization Expired / Lapsed 1963-02-28 1967-04-04 1 Details
US3303967A Feedback control for a material handling system providing a… Expired / Lapsed 1965-09-28 1967-02-14 2 Details
US3299329A Semiconductor structures providing both unipolar transistor… Expired / Lapsed 1963-07-05 1967-01-17 2 Details
US3296452A Load regulation Expired / Lapsed 1963-09-16 1967-01-03 1 Details
US3295038A Reversing mechanism and circuit for reversing an electric m… Expired / Lapsed 1964-04-27 1966-12-27 2 Details
US3294924A Apparatus for carrying out industrial operation Expired / Lapsed 1958-05-29 1966-12-27 2 Details
US3291124A Pneumatically controlled portable heart massage apparatus Expired / Lapsed 1963-02-21 1966-12-13 2 Details
US3287703A Computer Expired / Lapsed 1962-12-04 1966-11-22 2 Details
US3287702A Computer control Expired / Lapsed 1962-12-04 1966-11-22 2 Details
US3280338A Constant current biasing circuit Expired / Lapsed 1961-06-27 1966-10-18 2 Details
US3268764A Radiation sensitive device Expired / Lapsed 1963-01-09 1966-08-23 2 Details
US3264839A Heat pumps for simultaneous cooling and heating Expired / Lapsed 1964-05-12 1966-08-09 2 Details
US3265934A Capacitor stacking unit Expired / Lapsed 1964-01-30 1966-08-09 2 Details
US3263138A Multifunctional semiconductor devices Expired / Lapsed 1960-02-29 1966-07-26 0 Details
US3255383A Fuse containing means responsive to large fault currents an… Expired / Lapsed 1963-01-29 1966-06-07 2 Details
US3252003A Unipolar transistor Expired / Lapsed 1962-09-10 1966-05-17 2 Details
US3252001A Vibration detection apparatus Expired / Lapsed 1961-11-29 1966-05-17 2 Details
US3248894A Refrigeration apparatus Expired / Lapsed 1965-02-08 1966-05-03 2 Details
US3237136A Coils for inductive apparatus Expired / Lapsed 1964-11-19 1966-02-22 2 Details
US3237062A Monolithic semiconductor devices Expired / Lapsed 1961-10-20 1966-02-22 2 Details
US3230429A Integrated transistor, diode and resistance semiconductor n… Expired / Lapsed 1962-01-09 1966-01-18 2 Details
US3220225A Photoflash lamp with printed circuit lead-in conductors Expired / Lapsed 1963-01-31 1965-11-30 2 Details
US3213323A Breaker tripping signal circuit Expired / Lapsed 1962-10-16 1965-10-19 2 Details
US3213424A Signalling system having control means at both dispatch and… Expired / Lapsed 1960-09-06 1965-10-19 2 Details
US3211929A Transient suppressor circuit Expired / Lapsed 1963-04-26 1965-10-12 2 Details
US3209130A Digital measuring device Expired / Lapsed 1962-04-30 1965-09-28 2 Details
US3201732A Wound magnetic core having turns which are given a predeter… Expired / Lapsed 1961-07-20 1965-08-17 0 Details
US3195043A Hall effect proximity transducer Expired / Lapsed 1961-05-19 1965-07-13 2 Details
US3189882A Alarm system with synchronous scanning Expired / Lapsed 1961-05-15 1965-06-15 1 Details
US3189805A Digital control apparatus having actual-position and error … Expired / Lapsed 1960-05-20 1965-06-15 2 Details
US3183369A Reversible counter operative to count either binary or bina… Expired / Lapsed 1961-08-16 1965-05-11 2 Details
US3178630A Constant frequency alternating current system Expired / Lapsed 1960-09-12 1965-04-13 2 Details
US3173101A Monolithic two stage unipolar-bipolar semiconductor amplifi… Expired / Lapsed 1961-02-15 1965-03-09 1 Details
US3173069A High gain transistor Expired / Lapsed 1961-02-15 1965-03-09 0 Details
US3170813A Method for encapsulating semiconductors Expired / Lapsed 1961-05-19 1965-02-23 2 Details
US3170107A Controlled frequency alternating current system Expired / Lapsed 1960-05-02 1965-02-16 2 Details
US3165686A Motor control apparatus Expired / Lapsed 1961-07-24 1965-01-12 2 Details
US3160800A High power semiconductor switch Expired / Lapsed 1961-10-27 1964-12-08 2 Details
US3155847A Circuit for protecting a load circuit from initial power su… Expired / Lapsed 1963-02-19 1964-11-03 1 Details
US3155885A Hermetically sealed semiconductor devices Expired / Lapsed 1962-09-21 1964-11-03 2 Details
US3152851A Wiring device and wire release arrangement therefor Expired / Lapsed 1963-04-12 1964-10-13 2 Details
US3148316A Contouring control apparatus Expired / Lapsed 1962-01-24 1964-09-08 2 Details
US3144592A Arrangement for controlling circuit continuity Expired / Lapsed 1961-04-28 1964-08-11 2 Details
US3144146A Mimic positioning controller Expired / Lapsed 1960-11-17 1964-08-11 2 Details
US3141135A Semiconductive oscillator-mixer device Expired / Lapsed 1962-05-11 1964-07-14 2 Details
US3136952A Automatic signal detector Expired / Lapsed 1960-11-21 1964-06-09 2 Details
US3134874A Current limiting fuse Expired / Lapsed 1961-01-30 1964-05-26 2 Details
US3134902A Infrared circular scan aerial reconnaissance system Expired / Lapsed 1959-01-02 1964-05-26 2 Details
US3133188A Infrared missile fire control system Expired / Lapsed 1957-09-27 1964-05-12 2 Details
US3121859A Remote metering system Expired / Lapsed 1960-04-29 1964-02-18 2 Details
US3114044A Electron multiplier isolating electrode structure Expired / Lapsed 1959-09-30 1963-12-10 2 Details
US3110836A Electroluminescent device and method of making Expired / Lapsed 1961-03-16 1963-11-12 4 Details
US3110853A Electrical control apparatus Expired / Lapsed 1958-06-05 1963-11-12 2 Details
US3106801A Portable electric greenhouse Expired / Lapsed 1961-08-30 1963-10-15 1 Details
US3107306A Anticoincident pulse responsive circuit comprising logic co… Expired / Lapsed 1959-07-01 1963-10-15 2 Details
US3107340A Remote signal systems Expired / Lapsed 1957-07-09 1963-10-15 2 Details
US3105166A Electron tube with a cold emissive cathode Expired / Lapsed 1959-01-15 1963-09-24 2 Details
US3099781A Digital control for machine positioning Expired / Lapsed 1961-11-15 1963-07-30 2 Details
US3099777A Digital position control servosystem Expired / Lapsed 1960-07-08 1963-07-30 2 Details
US3099824A Static logic annunciator Expired / Lapsed 1958-05-26 1963-07-30 2 Details
US3096577A Method of making aluminum clad copper wire Expired / Lapsed 1960-06-09 1963-07-09 2 Details
US3093740A Pulse transmitter and amplifier Expired / Lapsed 1959-09-29 1963-06-11 1 Details
US3089998A Regulator system Expired / Lapsed 1959-04-15 1963-05-14 2 Details
US3082351A Crossed-field amplifier Expired / Lapsed 1960-01-06 1963-03-19 2 Details
US3082322A Therapy unit Expired / Lapsed 1958-11-28 1963-03-19 2 Details
US3071845A Progressive winding of coils Expired / Lapsed 1957-04-24 1963-01-08 2 Details
US3064144A Bipolar integrator with diode bridge discharging circuit fo… Expired / Lapsed 1960-05-23 1962-11-13 0 Details
US3058036A Semiconductor circuit interrupter Expired / Lapsed 1957-07-09 1962-10-09 0 Details
US3058034A Circuit interrupter system utilizing static devices Expired / Lapsed 1957-07-09 1962-10-09 0 Details
US3044968A Positive temperature coefficient thermistor materials Expired / Lapsed 1958-05-13 1962-07-17 2 Details
US3044701A Method and apparatus for optimalizing the operation of a sy… Expired / Lapsed 1958-04-24 1962-07-17 0 Details
US3040625A Beam scanning apparatus Expired / Lapsed 1958-09-12 1962-06-26 0 Details
US3040239A Electrical control apparatus Expired / Lapsed 1958-07-14 1962-06-19 0 Details
US3040297A Supervisory control and remote metering Expired / Lapsed 1956-05-28 1962-06-19 0 Details
US3030542A Electroluminescent device Expired / Lapsed 1959-06-23 1962-04-17 2 Details
US3030574A Position indicator Expired / Lapsed 1957-02-26 1962-04-17 0 Details
US3023390A Applying electrodes to ceramic members Expired / Lapsed 1960-03-17 1962-02-27 2 Details
US3018442A Plural channel amplitude discriminator having differentiato… Expired / Lapsed 1958-09-12 1962-01-23 0 Details
US3014181A Generator of pulses with sequentially increasing spacing Expired / Lapsed 1960-01-25 1961-12-19 0 Details
US3011128A Triple coincidence detector Expired / Lapsed 1958-05-29 1961-11-28 0 Details
US3011166A Pulse doppler radar system Expired / Lapsed 1956-08-29 1961-11-28 0 Details
US3009220A Flexible tieing and locking device Expired / Lapsed 1958-02-24 1961-11-21 0 Details
US3010053A Triggered relay circuit Expired / Lapsed 1957-09-13 1961-11-21 0 Details
US3007119A Modulating circuit and field effect semiconductor structure… Expired / Lapsed 1959-11-04 1961-10-31 0 Details
US3005411A Automatic remote control apparatus Expired / Lapsed 1957-11-29 1961-10-24 0 Details
US3002101A Image amplifier Expired / Lapsed 1954-03-17 1961-09-26 0 Details
US3001100A Undervoltage sensing circuit Expired / Lapsed 1958-10-27 1961-09-19 0 Details
US3000085A Plating of sintered tungsten contacts Expired / Lapsed 1958-06-13 1961-09-19 2 Details
US2999144A Control device Expired / Lapsed 1956-12-14 1961-09-05 0 Details
US2997606A High speed switching circuit Expired / Lapsed 1959-11-27 1961-08-22 0 Details
US2994759A Temperature control system Expired / Lapsed 1959-08-31 1961-08-01 0 Details
US2993147A Turbine zero speed indicator and control circuit Expired / Lapsed 1958-08-05 1961-07-18 0 Details
US2993194A Remote metering apparatus and system Expired / Lapsed 1956-11-14 1961-07-18 0 Details
US2989682A Control circuitry Expired / Lapsed 1958-03-31 1961-06-20 0 Details
US2989424A Method of providing an oxide protective coating for semicon… Expired / Lapsed 1958-03-31 1961-06-20 2 Details
US2985774A Polarity sensing amplifier circuit Expired / Lapsed 1959-08-27 1961-05-23 0 Details
US2985773A Differential frequency rate circuit comprising logic compon… Expired / Lapsed 1959-01-28 1961-05-23 0 Details
US2985835A Shift register circuit Expired / Lapsed 1957-07-18 1961-05-23 0 Details
US2982902A Control apparatus responsive to condition of rest or moveme… Expired / Lapsed 1960-01-08 1961-05-02 0 Details
US2981699A Positive temperature coefficient thermistor materials Expired / Lapsed 1959-12-28 1961-04-25 2 Details
US2980832A High current npnp switch Expired / Lapsed 1959-06-10 1961-04-18 0 Details
US2977486A Pulse control apparatus Expired / Lapsed 1959-07-10 1961-03-28 0 Details
US2976848A Linearized parallel control valve for control systems Expired / Lapsed 1957-03-28 1961-03-28 0 Details
US2972709A Automatic line sectionalizer Expired / Lapsed 1958-03-27 1961-02-21 0 Details
US2972743A Combined infrared-radar antenna Expired / Lapsed 1957-06-19 1961-02-21 0 Details
US2970228A Timing circuit Expired / Lapsed 1958-03-13 1961-01-31 0 Details
US2970219A Use of thin film field emitters in luminographs and image i… Expired / Lapsed 1955-08-18 1961-01-31 0 Details
US2967793A Semiconductor devices with bi-polar injection characteristi… Expired / Lapsed 1959-02-24 1961-01-10 2 Details
US2965772A Semiconductor switch Expired / Lapsed 1958-10-08 1960-12-20 0 Details
US2963590A Regulating system Expired / Lapsed 1957-08-07 1960-12-06 0 Details
US2962621A Color television apparatus Expired / Lapsed 1958-10-10 1960-11-29 0 Details
US2962607A Hyperconductive control Expired / Lapsed 1958-03-20 1960-11-29 0 Details
US2962642A Motor control for steering vehicle Expired / Lapsed 1957-04-24 1960-11-29 0 Details
US2962702A Remote metering Expired / Lapsed 1956-02-20 1960-11-29 0 Details
US2962603A Electronic switch device Expired / Lapsed 1954-06-21 1960-11-29 0 Details
US2957109A Overcurrent protection devices Expired / Lapsed 1958-06-10 1960-10-18 0 Details
US2953741A Magnetic amplifiers Expired / Lapsed 1958-04-21 1960-09-20 0 Details
US2953693A Semiconductor diode Expired / Lapsed 1957-02-27 1960-09-20 0 Details
US2953738A Rectifier device Expired / Lapsed 1954-06-02 1960-09-20 0 Details
US2949545A Timing circuit Expired / Lapsed 1957-11-14 1960-08-16 0 Details
US2949582A Pulse generators Expired / Lapsed 1956-04-25 1960-08-16 0 Details
US2943455A Refrigerator cabinet Expired / Lapsed 1957-07-26 1960-07-05 0 Details
US2942117A Magnetic tracking detector apparatus Expired / Lapsed 1957-07-26 1960-06-21 0 Details
US2942123A Time delay control device Expired / Lapsed 1956-01-31 1960-06-21 0 Details
US2939909A Television system Expired / Lapsed 1955-07-06 1960-06-07 0 Details
US2932954A Illuminating and heating and cooling panel member Expired / Lapsed 1958-10-17 1960-04-19 0 Details
US2933612A Line tracer scanning head Expired / Lapsed 1958-01-07 1960-04-19 0 Details
US2933623A Apparatus for generating an electrical signal having a tria… Expired / Lapsed 1957-08-13 1960-04-19 0 Details
US2933662A Semiconductor rectifier device Expired / Lapsed 1954-01-14 1960-04-19 0 Details
US2930208A Dehumidification apparatus Expired / Lapsed 1958-03-14 1960-03-29 0 Details
US2929935A Image amplifier Expired / Lapsed 1954-07-23 1960-03-22 2 Details
US2927679A Control apparatus Expired / Lapsed 1959-01-16 1960-03-08 0 Details
US2924724A Time delay circuits Expired / Lapsed 1957-04-24 1960-02-09 0 Details
US2922092A Base contact members for semiconductor devices Expired / Lapsed 1957-05-09 1960-01-19 2 Details
US2913146A Motor control apparatus Expired / Lapsed 1957-09-24 1959-11-17 0 Details
US2909705A Control circuit Expired / Lapsed 1958-05-29 1959-10-20 0 Details
US2909672A Electric governor for prime movers Expired / Lapsed 1957-10-28 1959-10-20 0 Details
US2909709A Circuit interrupter control circuits Expired / Lapsed 1954-12-08 1959-10-20 0 Details
US2905838A Punch press control Expired / Lapsed 1956-05-29 1959-09-22 0 Details
US2898499A Transmission secondary emission dynode structure Expired / Lapsed 1956-05-23 1959-08-04 0 Details
US2892090A X-ray apparatus Expired / Lapsed 1957-05-28 1959-06-23 0 Details
US2892101A Transistor time delay circuit Expired / Lapsed 1956-04-25 1959-06-23 0 Details
US2885560A X-ray method Expired / Lapsed 1957-03-13 1959-05-05 0 Details
US2885558A X-ray system Expired / Lapsed 1957-03-13 1959-05-05 0 Details
US2879458A Diode matrix Expired / Lapsed 1957-10-30 1959-03-24 0 Details
US2879406A Electron discharge tube structure Expired / Lapsed 1955-05-31 1959-03-24 0 Details
US2875382A Time delay devices for circuit interrupters Expired / Lapsed 1957-02-18 1959-02-24 0 Details
US2875360A Image intensifier Expired / Lapsed 1953-05-25 1959-02-24 0 Details
US2866106A Voltage sensitive control device Expired / Lapsed 1956-06-22 1958-12-23 0 Details
US2858489A Power transistor Expired / Lapsed 1955-11-04 1958-10-28 0 Details
US2858515A Electrical connector with resilient gripping means Expired / Lapsed 1954-08-12 1958-10-28 0 Details
US2849605A Single sideband communication system Expired / Lapsed 1957-05-06 1958-08-26 0 Details
US2849665A Ultra high power transistor Expired / Lapsed 1955-10-17 1958-08-26 0 Details
US2845583A Circuit breaker control system Expired / Lapsed 1956-08-29 1958-07-29 0 Details
US2845548A Static time delay circuit Expired / Lapsed 1956-04-25 1958-07-29 0 Details
US2845552A Electric motor Expired / Lapsed 1955-09-26 1958-07-29 0 Details
US2840727A Self-locking transistor switching circuit Expired / Lapsed 1956-03-27 1958-06-24 0 Details
US2840769A Electromagnetic operator Expired / Lapsed 1955-08-23 1958-06-24 0 Details
US2840497A Junction transistors and processes for producing them Expired / Lapsed 1954-10-29 1958-06-24 2 Details
US2840802A Control systems Expired / Lapsed 1953-06-04 1958-06-24 0 Details
US2836734A Voltage control apparatus Expired / Lapsed 1957-04-09 1958-05-27 0 Details
US2834536A Spin vane controls for fans Expired / Lapsed 1955-09-29 1958-05-13 0 Details
US2832948A Static annunciator Expired / Lapsed 1956-03-09 1958-04-29 0 Details
US2827789A Control arrangements for craft operable in space Expired / Lapsed 1955-04-27 1958-03-25 0 Details
US2824698A Recycling pulse counter Expired / Lapsed 1955-10-04 1958-02-25 0 Details
US2824697A Control apparatus Expired / Lapsed 1954-06-08 1958-02-25 0 Details
US2821639A Transistor switching circuits Expired / Lapsed 1954-10-28 1958-01-28 0 Details
US2821666A Control and protection of electric power systems Expired / Lapsed 1954-02-19 1958-01-28 0 Details
US2809303A Control systems for switching transistors Expired / Lapsed 1956-06-22 1957-10-08 0 Details
US2806674A Heat pumps Expired / Lapsed 1954-09-02 1957-09-17 0 Details
US2798823A Fluorescent screen for X-ray image tube and method for prep… Expired / Lapsed 1954-10-21 1957-07-09 2 Details
US2797367A Lighting system Expired / Lapsed 1955-11-16 1957-06-25 0 Details
US2795697A Temperature control Expired / Lapsed 1954-03-19 1957-06-11 0 Details
US2795670A Circuit breaker Expired / Lapsed 1954-02-19 1957-06-11 0 Details
US2793373A Baffle and closure assembly for food waste disposer Expired / Lapsed 1955-09-30 1957-05-28 0 Details
US2792080A Accurate landing elevator systems Expired / Lapsed 1954-08-31 1957-05-14 0 Details
US2783384A Electrical inverter circuits Expired / Lapsed 1954-04-06 1957-02-26 0 Details
US2777081A Electrical brush and dynamoelectric apparatus embodying the… Expired / Lapsed 1955-10-07 1957-01-08 2 Details
US2776733A Elevator systems Expired / Lapsed 1955-06-02 1957-01-08 0 Details
US2777067A Triple channel time sharing switch Expired / Lapsed 1954-05-26 1957-01-08 0 Details
US2776887A Preparation of molybdenum Expired / Lapsed 1952-08-22 1957-01-08 2 Details
US2774022A Motor control system Expired / Lapsed 1953-06-15 1956-12-11 0 Details
US2773200A Direct current transformation device Expired / Lapsed 1954-10-22 1956-12-04 0 Details
US2773132A Magnetic amplifier Expired / Lapsed 1954-06-02 1956-12-04 0 Details
US2773255A Electronic detecting and indicating system Expired / Lapsed 1950-10-27 1956-12-04 0 Details
US2769076A Automatic temperature control for high temperature ovens Expired / Lapsed 1954-03-01 1956-10-30 0 Details
US2769131A Motor acceleration system Expired / Lapsed 1953-10-30 1956-10-30 0 Details
US2767365A Motor control system Expired / Lapsed 1955-05-06 1956-10-16 0 Details
US2767364A Motor control system Expired / Lapsed 1955-05-06 1956-10-16 0 Details
US2760088A Pulse-shaping circuits Expired / Lapsed 1954-06-08 1956-08-21 0 Details
US2757297A Time delay devices Expired / Lapsed 1955-06-07 1956-07-31 0 Details
US2749535A Telemetering systems Expired / Lapsed 1951-11-23 1956-06-05 0 Details
US2743397A Remote control systems Expired / Lapsed 1952-06-26 1956-04-24 0 Details
US2740086A Electrical control apparatus Expired / Lapsed 1955-01-28 1956-03-27 0 Details
US2729389A Air translating apparatus Expired / Lapsed 1954-09-10 1956-01-03 0 Details
US2727160A Pulse generator Expired / Lapsed 1955-01-18 1955-12-13 0 Details
US2727173A Background reduction in image tube Expired / Lapsed 1952-01-22 1955-12-13 0 Details
US2727118A Heat sensitive resistor Expired / Lapsed 1951-12-29 1955-12-13 0 Details
US2727146A Sinusoidal oscillators Expired / Lapsed 1951-10-26 1955-12-13 0 Details
US2725549A Circuit means for selecting the highest or lowest of a plur… Expired / Lapsed 1954-05-25 1955-11-29 0 Details
US2725519A Magnetic amplifier electrical position control system Expired / Lapsed 1952-03-31 1955-11-29 0 Details
US2724892A Method for forming metal to ceramic seal Expired / Lapsed 1950-11-14 1955-11-29 2 Details
US2722649A Arcless switching device Expired / Lapsed 1954-08-09 1955-11-01 0 Details
US2722647A Motor control system Expired / Lapsed 1950-10-27 1955-11-01 0 Details
US2719098A Ground glass surfaces with protective and stabilizing therm… Expired / Lapsed 1953-05-11 1955-09-27 2 Details
US2717219A Asbestos fiber electrical insulating member impregnated wit… Expired / Lapsed 1952-03-29 1955-09-06 2 Details
US2711982A Method of making rolled phenolic resinbonded paper tubing Expired / Lapsed 1951-02-21 1955-06-28 2 Details
US2702862A Housed lamp and fixture Expired / Lapsed 1952-05-07 1955-02-22 0 Details
US2699143A Apparatus for improved primer dipping of photoflash lamp le… Expired / Lapsed 1952-01-24 1955-01-11 0 Details
US2697195A Motor protection circuit Expired / Lapsed 1953-01-02 1954-12-14 0 Details
US2697201A Adjustable nonlinear resistance Expired / Lapsed 1949-09-27 1954-12-14 0 Details
US2694028A Aluminum based laminate member and process for producing th… Expired / Lapsed 1952-05-28 1954-11-09 2 Details
US2693530A Television apparatus Expired / Lapsed 1949-06-29 1954-11-02 0 Details
US2691732A Radio frequency generator Expired / Lapsed 1948-12-07 1954-10-12 0 Details
US2689933A Thermally protected two-speed motors Expired / Lapsed 1953-06-26 1954-09-21 0 Details
US2686155A Process for producing a molded solid molybdenum disulfide l… Expired / Lapsed 1950-01-17 1954-08-10 2 Details
US2680215A Window temperature control Expired / Lapsed 1950-03-17 1954-06-01 0 Details
US2679598A X-ray apparatus Expired / Lapsed 1950-12-04 1954-05-25 0 Details
US2679594A Wave generator Expired / Lapsed 1950-02-28 1954-05-25 0 Details
US2677097A Regulator system for generators Expired / Lapsed 1953-02-05 1954-04-27 0 Details
US2677086A Circuit for phase sensitive servo amplifiers Expired / Lapsed 1951-12-29 1954-04-27 0 Details
US2677014A Tone-shift carrier Expired / Lapsed 1950-06-29 1954-04-27 0 Details
US2672727A Fuel vaporizer system for combustion chambers Expired / Lapsed 1951-05-31 1954-03-23 0 Details
US2666816A Semiconductor amplifier Expired / Lapsed 1950-10-20 1954-01-19 0 Details
US2666824A Circuit breaker Expired / Lapsed 1950-10-18 1954-01-19 0 Details
US2666872A Electric power system for aircraft Expired / Lapsed 1950-08-19 1954-01-19 0 Details
US2664544A Testing and packing fixture Expired / Lapsed 1952-09-30 1953-12-29 0 Details
US2663477A Food dispensing apparatus control system Expired / Lapsed 1947-12-18 1953-12-22 0 Details
US2661307A Process for applying a completely polymerizable thermosetti… Expired / Lapsed 1949-01-19 1953-12-01 2 Details
US2655994A Control system for cutting apparatus Expired / Lapsed 1950-05-31 1953-10-20 0 Details
US2656509A Apparatus for measuring the vector difference of two altern… Expired / Lapsed 1950-03-04 1953-10-20 0 Details
US2654961A Clothes-drying apparatus Expired / Lapsed 1951-05-12 1953-10-13 0 Details
US2653139A In-place expanded cellular resinous bodies and processes fo… Expired / Lapsed 1950-05-20 1953-09-22 2 Details
US2653247A X-ray thickness gauge Expired / Lapsed 1948-05-08 1953-09-22 0 Details
US2652623A Manufacture of refractory metal tubes Expired / Lapsed 1945-03-10 1953-09-22 1 Details
US2649906A Selective fuel control apparatus for turbojet engines Expired / Lapsed 1950-03-17 1953-08-25 0 Details
US2648006A Frequency generator Expired / Lapsed 1949-11-14 1953-08-04 0 Details
US2647983A Power regulation in high-frequency heating apparatus Expired / Lapsed 1948-12-22 1953-08-04 0 Details
US2644931A Supervisory control system Expired / Lapsed 1952-03-28 1953-07-07 0 Details
US2640180A Welding apparatus Expired / Lapsed 1948-04-02 1953-05-26 0 Details
US2638288A Control system for craft operable in space Expired / Lapsed 1947-11-14 1953-05-12 0 Details
US2632091A Dielectric heating with tubeoscillator generators Expired / Lapsed 1948-12-07 1953-03-17 0 Details
US2629847A Magnetic amplifier circuits for applying reversible direct-… Expired / Lapsed 1950-08-25 1953-02-24 0 Details
US2629698A Cellular expanded thermoset resins Expired / Lapsed 1949-12-30 1953-02-24 2 Details
US2629093A Multiseal envelope and the method of making Expired / Lapsed 1949-03-08 1953-02-17 0 Details
US2628019A Free air fan Expired / Lapsed 1951-02-09 1953-02-10 0 Details
US2628020A Air translating apparatus Expired / Lapsed 1947-08-14 1953-02-10 0 Details
US2626223A Synthetic resin and insulated products produced therewith Expired / Lapsed 1951-10-17 1953-01-20 2 Details
US2626315A Combination radio and television receiver Expired / Lapsed 1950-09-08 1953-01-20 0 Details
US2625793A Gas turbine apparatus with air-cooling means Expired / Lapsed 1949-05-19 1953-01-20 0 Details
US2626357A Means for combining frequencies Expired / Lapsed 1947-09-19 1953-01-20 0 Details
US2624015A Load regulating system Expired / Lapsed 1951-03-03 1952-12-30 0 Details
US2623939A Remote-control system Expired / Lapsed 1949-04-02 1952-12-30 0 Details
US2619569A Electrical contact mounting Expired / Lapsed 1950-07-12 1952-11-25 0 Details
US2619458A Compositions embodying solid lubricants Expired / Lapsed 1949-05-14 1952-11-25 4 Details
US2619627A Electric converting device Expired / Lapsed 1949-01-28 1952-11-25 0 Details
US2617361A Fuel system Expired / Lapsed 1950-03-17 1952-11-11 0 Details
US2615984A Single-tube frequency-modulated oscillator Expired / Lapsed 1950-06-29 1952-10-28 0 Details
US2615775A Outdoor metal-clad switchgear Expired / Lapsed 1947-10-30 1952-10-28 0 Details
US2611930A Insulating electrical apparatus Expired / Lapsed 1948-08-06 1952-09-30 0 Details
US2608635A Temperature regulating system Expired / Lapsed 1950-03-17 1952-08-26 0 Details
US2608672A Cathode-ray tube circuit Expired / Lapsed 1950-01-20 1952-08-26 0 Details
US2608536A Cellular resins Expired / Lapsed 1950-01-17 1952-08-26 2 Details
US2605325A Bridge-connected relay Expired / Lapsed 1950-06-20 1952-07-29 0 Details
US2604496A Semiconductor relay device Expired / Lapsed 1951-02-08 1952-07-22 0 Details
US2601243A Process for producing consolidated insulation on high-volta… Expired / Lapsed 1949-10-20 1952-06-24 0 Details
US2594022A Magnetic amplifier relay circuits Expired / Lapsed 1950-08-05 1952-04-22 0 Details
US2591938A Gyroscope control system for dirigible craft Expired / Lapsed 1947-12-11 1952-04-08 0 Details
US2586393A Pressure measuring apparatus Expired / Lapsed 1948-05-05 1952-02-19 0 Details
US2583139A Auxiliary contact device for electric contactors Expired / Lapsed 1949-11-01 1952-01-22 0 Details
US2583138A Frequency modulator Expired / Lapsed 1946-12-26 1952-01-22 0 Details
US2575702A Vacuum tube oscillator Expired / Lapsed 1949-06-16 1951-11-20 0 Details
US2575711A Mass spectrometer recorder Expired / Lapsed 1947-10-31 1951-11-20 0 Details
US2571863A Force responsive device for flow meters Expired / Lapsed 1948-12-22 1951-10-16 0 Details
US2571899A Vibration pickup Expired / Lapsed 1948-12-11 1951-10-16 0 Details
US2568406A Method and means for testing rotors Expired / Lapsed 1947-02-24 1951-09-18 0 Details
US2565734A X-ray thickness gauge Expired / Lapsed 1949-04-28 1951-08-28 0 Details
US2563975A Two temperature refrigerator Expired / Lapsed 1948-09-24 1951-08-14 0 Details
US2561982A Varnish treatment of electrical apparatus Expired / Lapsed 1948-12-22 1951-07-24 0 Details
US2558100A Frequency stabilizer Expired / Lapsed 1948-11-02 1951-06-26 0 Details
US2558086A Reactor-controlled adjustablespeed drive Expired / Lapsed 1948-03-31 1951-06-26 0 Details
US2558094A Reactor controlled adjustable speed drive Expired / Lapsed 1948-03-31 1951-06-26 0 Details
US2555545A Image intensifier Expired / Lapsed 1947-08-28 1951-06-05 0 Details
US2554672A Clothes weighing door for washing machines Expired / Lapsed 1950-05-10 1951-05-29 0 Details
US2552851A Combustion chamber with retrorse baffles for preheating the… Expired / Lapsed 1949-10-25 1951-05-15 0 Details
US2552855A Tumbling apparatus Expired / Lapsed 1946-08-10 1951-05-15 0 Details
US2550109A Remote metering system Expired / Lapsed 1948-06-01 1951-04-24 0 Details
US2550122A Control system Expired / Lapsed 1947-07-17 1951-04-24 0 Details
US2550106A Detector for elementary particles Expired / Lapsed 1947-06-06 1951-04-24 0 Details
US2545995A Polarized protective relay Expired / Lapsed 1947-12-30 1951-03-20 0 Details
US2546004A Progressive dielectric heating Expired / Lapsed 1947-07-11 1951-03-20 0 Details
US2542048A Resinous compositions Expired / Lapsed 1946-10-12 1951-02-20 2 Details
US2542823A Short-wave broadcast net Expired / Lapsed 1945-10-19 1951-02-20 0 Details
US2537067A Production of thorium Expired / Lapsed 1946-04-24 1951-01-09 0 Details
US2534932A Method of detecting elementary particles Expired / Lapsed 1947-06-19 1950-12-19 0 Details
US2534754A Control circuit Expired / Lapsed 1945-10-31 1950-12-19 0 Details
US2533501A Electrical insulation comprising polytetrafluoroethylene Expired / Lapsed 1948-03-24 1950-12-12 2 Details
US2530980A Control system for window heaters Expired / Lapsed 1949-03-01 1950-11-21 0 Details
US2531007A Circuit interrupter embodying polytetrafluoroethylene Expired / Lapsed 1947-03-20 1950-11-21 0 Details
US2525472A Turbine-electric locomotive control system Expired / Lapsed 1947-08-28 1950-10-10 0 Details
US2525496A Analyzer Expired / Lapsed 1946-09-28 1950-10-10 0 Details
US2524932A Process for producing bonded mica Expired / Lapsed 1946-09-12 1950-10-10 2 Details
US2523999A Polyester-amide compositions and insulated conductors prepa… Expired / Lapsed 1948-04-23 1950-09-26 1 Details
US2523132A Photosensitive apparatus Expired / Lapsed 1949-08-10 1950-09-19 0 Details
US2523155A Glass-to-metal sealing Expired / Lapsed 1944-05-24 1950-09-19 0 Details
US2519339A Dynamo field control by unsaturated reactors Expired / Lapsed 1948-03-31 1950-08-22 0 Details
US2516009A Converter system Expired / Lapsed 1948-10-28 1950-07-18 0 Details
US2515982A Dynamic braking system Expired / Lapsed 1947-03-08 1950-07-18 0 Details
US2512154A Electronic prime mover regulator Expired / Lapsed 1948-05-19 1950-06-20 0 Details
US2512355A X-ray thickness gauge Expired / Lapsed 1947-06-30 1950-06-20 0 Details
US2512322A Wide speed range control Expired / Lapsed 1946-11-27 1950-06-20 0 Details
US2510652A Single-phase low-frequency control for welding Expired / Lapsed 1948-09-30 1950-06-06 0 Details
US2508467A Low-frequency seam timer Expired / Lapsed 1948-09-30 1950-05-23 0 Details
US2508420A Combustion apparatus Expired / Lapsed 1948-09-21 1950-05-23 0 Details
US2508171A Electrode construction Expired / Lapsed 1948-08-19 1950-05-16 0 Details
US2508205A Temperature indicating device Expired / Lapsed 1947-03-08 1950-05-16 0 Details
US2508162A Electric motor control system Expired / Lapsed 1945-04-30 1950-05-16 0 Details
US2508169A Alternating current motor control system Expired / Lapsed 1944-05-26 1950-05-16 0 Details
US2505041A Drying apparatus having operation sequence control Expired / Lapsed 1945-12-29 1950-04-25 0 Details
US2504640A Reheat turbine control Expired / Lapsed 1948-07-03 1950-04-18 0 Details
US2504109A Dielectric heating with cavity resonator Expired / Lapsed 1946-10-04 1950-04-18 0 Details
US2501331A Liquid-cooled rectifier assembly Expired / Lapsed 1947-02-24 1950-03-21 0 Details
US2500939A Protective system Expired / Lapsed 1945-04-16 1950-03-21 0 Details
US2501352A Controlling means for operating an electronic oscillograph … Expired / Lapsed 1944-11-16 1950-03-21 0 Details
US2500070A Multistage, axial flow, gas compressor Expired / Lapsed 1947-11-29 1950-03-07 0 Details
US2499806A Gas constituency audible indicating device Expired / Lapsed 1945-07-27 1950-03-07 0 Details
US2498769A Manufacture of alloys Expired / Lapsed 1944-10-21 1950-02-28 2 Details
US2497909A Register regulator for printing presses Expired / Lapsed 1946-12-10 1950-02-21 0 Details
US2498282A Torque measuring device for shafts Expired / Lapsed 1946-05-15 1950-02-21 0 Details
US2498294A Light projector Expired / Lapsed 1945-11-30 1950-02-21 0 Details
US2496076A Phonographic thread remover Expired / Lapsed 1944-07-27 1950-01-31 0 Details
US2492990A Stabilizing system Expired / Lapsed 1943-11-06 1950-01-03 0 Details
US2492648A Two temperature refrigeration apparatus Expired / Lapsed 1945-11-10 1949-12-27 0 Details
US2491998A Fluid-flow indicator Expired / Lapsed 1944-02-19 1949-12-20 0 Details
US2491237A Manufacture of miniature lamps Expired / Lapsed 1947-05-17 1949-12-13 0 Details
US2488422A Regulating system Expired / Lapsed 1947-12-30 1949-11-15 0 Details
US2488365A All-around motor ventilation Expired / Lapsed 1947-01-15 1949-11-15 0 Details
US2488446A Polytetrafluoroethylene casting mold Expired / Lapsed 1945-12-12 1949-11-15 0 Details
US2488412A Control system Expired / Lapsed 1945-02-27 1949-11-15 0 Details
US2486334A Photoelectric scanner for register regulation Expired / Lapsed 1948-09-25 1949-10-25 0 Details
US2486315A Drying apparatus Expired / Lapsed 1947-12-30 1949-10-25 0 Details
US2484208A Remote-control system Expired / Lapsed 1947-03-27 1949-10-11 0 Details
US2484214A Method of making magnetic cores Expired / Lapsed 1945-12-15 1949-10-11 0 Details
US2483401A Exhaust nozzle actuating mechanism Expired / Lapsed 1947-06-05 1949-10-04 0 Details
US2482101A Control system Expired / Lapsed 1945-04-30 1949-09-20 0 Details
US2481662A Water cooler Expired / Lapsed 1943-05-06 1949-09-13 0 Details
US2480835A Photoelectric control apparatus Expired / Lapsed 1946-12-10 1949-09-06 0 Details
US2480574A Gyro-controlled servomotor system Expired / Lapsed 1945-06-07 1949-08-30 0 Details
US2479301A Selenium rectifier Expired / Lapsed 1947-11-29 1949-08-16 0 Details
US2476938A Circuit breaker control system Expired / Lapsed 1945-11-28 1949-07-19 0 Details
US2476804A Control circuit Expired / Lapsed 1945-06-25 1949-07-19 0 Details
US2476886A Contact construction Expired / Lapsed 1943-05-29 1949-07-19 0 Details
US2474843A Control mechanism Expired / Lapsed 1946-09-21 1949-07-05 0 Details
US2474258A Turbine apparatus Expired / Lapsed 1946-01-03 1949-06-28 0 Details
US2473884A Contact means Expired / Lapsed 1946-05-07 1949-06-21 0 Details
US2473853A Frequency control system Expired / Lapsed 1946-01-22 1949-06-21 0 Details
US2473724A Ultra high frequency coupler between contiguous ends of ali… Expired / Lapsed 1943-09-24 1949-06-21 0 Details
US2473893A Object detecting and indicating device Expired / Lapsed 1941-09-19 1949-06-21 0 Details
US2473915A Heating and welding system Expired / Lapsed 1941-06-21 1949-06-21 0 Details
US2472802A Lubrication system Expired / Lapsed 1947-06-04 1949-06-14 0 Details
US2470633A Temperature control system Expired / Lapsed 1947-12-30 1949-05-17 0 Details
US2469975A Method for charging individual capsules with a compressed g… Expired / Lapsed 1946-11-07 1949-05-10 0 Details
US2467727A Connection block for use with carrier-current line traps Expired / Lapsed 1947-05-28 1949-04-19 0 Details
US2465312A Temperature regulating system Expired / Lapsed 1947-12-30 1949-03-22 0 Details
US2465284A Magnetic sheet coatings Expired / Lapsed 1946-06-08 1949-03-22 0 Details
US2465249A High-efficiency multivibrator circuits Expired / Lapsed 1945-11-02 1949-03-22 0 Details
US2464990A Electric lamp manufacture Expired / Lapsed 1945-08-28 1949-03-22 0 Details
US2463934A Control mechanism for clothesdrying apparatus Expired / Lapsed 1946-04-10 1949-03-08 0 Details
US2462207A Temperature regulating system Expired / Lapsed 1947-05-28 1949-02-22 0 Details
US2459173A Defrosting means for refrigeration apparatus Expired / Lapsed 1946-02-05 1949-01-18 0 Details
US2459653A Insulated conductor Expired / Lapsed 1945-09-08 1949-01-18 0 Details
US2456902A Contact and shorting mechanism Expired / Lapsed 1945-03-17 1948-12-21 0 Details
US2454322A Manufacture of molybdenum Expired / Lapsed 1946-04-17 1948-11-23 0 Details
US2454180A Frame structure of dynamoelectric machines Expired / Lapsed 1947-08-28 1948-11-16 0 Details
US2454136A Two-speed single-phase motor Expired / Lapsed 1946-12-03 1948-11-16 0 Details
US2451976A Control system Expired / Lapsed 1945-11-28 1948-10-19 0 Details
US2451935A Method of cast polymerization Expired / Lapsed 1944-07-07 1948-10-19 0 Details
US2451950A Electrical network Expired / Lapsed 1944-04-27 1948-10-19 0 Details
US2449480A Lighting control system for airports Expired / Lapsed 1944-07-20 1948-09-14 0 Details
US2448008A Controlled induction heating Expired / Lapsed 1943-12-07 1948-08-31 0 Details
US2447654A Torque control system for electric reel motors Expired / Lapsed 1946-06-08 1948-08-24 0 Details
US2447848A Cleaning and centrifuging apparatus Expired / Lapsed 1945-10-09 1948-08-24 0 Details
US2445460A Dynamic braking system Expired / Lapsed 1947-02-21 1948-07-20 0 Details
US2445455A Electrical micrometer gauge Expired / Lapsed 1941-12-05 1948-07-20 0 Details
US2445021A Thermostatic switch Expired / Lapsed 1942-12-29 1948-07-13 0 Details
US2443667A Pump Expired / Lapsed 1945-08-18 1948-06-22 0 Details
US2443654A Electrical connector Expired / Lapsed 1944-09-20 1948-06-22 0 Details
US2442882A Bottle cooling apparatus Expired / Lapsed 1942-03-03 1948-06-08 0 Details
US2442256A Synchronized timer Expired / Lapsed 1947-02-05 1948-05-25 0 Details
US2442257A Electronic converter Expired / Lapsed 1946-12-14 1948-05-25 0 Details
US2441239A Blower apparatus Expired / Lapsed 1944-01-29 1948-05-11 0 Details
US2440041A Electric flatiron Expired / Lapsed 1945-03-24 1948-04-20 0 Details
US2439842A Control mechanism Expired / Lapsed 1944-11-06 1948-04-20 0 Details
US2438025A Switchboard Expired / Lapsed 1944-02-10 1948-03-16 0 Details
US2436341A Slip-indicating system for electrically propelled locomotiv… Expired / Lapsed 1945-11-08 1948-02-17 0 Details
US2436346A Dynamometer control system Expired / Lapsed 1945-08-10 1948-02-17 0 Details
US2433390A Motor-generator Expired / Lapsed 1944-11-16 1947-12-30 0 Details
US2432876A Control system Expired / Lapsed 1945-07-02 1947-12-16 0 Details
US2432869A Steering control solenoid structure Expired / Lapsed 1945-03-29 1947-12-16 0 Details
US2432547A Temperature and liquid level control for refrigeration appa… Expired / Lapsed 1945-02-06 1947-12-16 0 Details
US2432899A Shockproof electromagnetic contactor Expired / Lapsed 1944-11-16 1947-12-16 0 Details
US2432227A Pulsed oscillator Expired / Lapsed 1943-08-24 1947-12-09 0 Details
US2431690A Consolidation of metal powder Expired / Lapsed 1945-02-21 1947-12-02 0 Details
US2431237A Control circuit Expired / Lapsed 1945-10-19 1947-11-18 0 Details
US2431260A Torque measuring device Expired / Lapsed 1944-08-25 1947-11-18 0 Details
US2431135A Apparatus for coating cathodes Expired / Lapsed 1944-03-29 1947-11-18 0 Details
US2429291A Magnetron Expired / Lapsed 1943-07-01 1947-10-21 0 Details
US2427751A Capacitor closed relay having reduced holding current Expired / Lapsed 1946-12-07 1947-09-23 0 Details
US2427729A Battery charging system Expired / Lapsed 1945-03-23 1947-09-23 0 Details
US2427945A Electric hot plate with vesseltemperature control Expired / Lapsed 1942-12-05 1947-09-23 0 Details
US2426301A Latch for contactors Expired / Lapsed 1942-09-15 1947-08-26 0 Details
US2424345A Switchgear Expired / Lapsed 1944-05-30 1947-07-22 0 Details
US2422589A Reinforced contact clip Expired / Lapsed 1943-07-28 1947-06-17 0 Details
US2422567A Electronic control for motors Expired / Lapsed 1943-07-24 1947-06-17 0 Details
US2422579A Reflector for electromagnetic radiation Expired / Lapsed 1942-08-26 1947-06-17 0 Details
US2420873A "rectox" motor control system Expired / Lapsed 1943-07-03 1947-05-20 0 Details
US2419049A Metal supported glass window Expired / Lapsed 1943-03-29 1947-04-15 0 Details
US2419111A Electrostatic relay Expired / Lapsed 1942-10-22 1947-04-15 0 Details
US2416200A Cathode-ray tube with spot intensity proportional to radial… Expired / Lapsed 1943-11-24 1947-02-18 0 Details
US2416201A Multivibrator circuits Expired / Lapsed 1942-10-22 1947-02-18 0 Details
US2416170A Circuit breaker Expired / Lapsed 1942-09-15 1947-02-18 0 Details
US2416202A Treatment for resins to eliminate static Expired / Lapsed 1942-01-14 1947-02-18 0 Details
US2414604A Terminal assembly Expired / Lapsed 1944-04-10 1947-01-21 0 Details
US2414525A Process of applying insulation Expired / Lapsed 1944-02-25 1947-01-21 0 Details
US2414541A Electronic frequency multiplier Expired / Lapsed 1943-07-31 1947-01-21 0 Details
US2414543A Dynamoelectric apparatus Expired / Lapsed 1943-06-10 1947-01-21 0 Details
US2412881A Control system Expired / Lapsed 1944-09-14 1946-12-17 0 Details
US2412573A Heat exchange apparatus Expired / Lapsed 1942-04-15 1946-12-17 0 Details
US2412514A Electric catapult control Expired / Lapsed 1943-08-31 1946-12-10 0 Details
US2412515A Control for electric catapults Expired / Lapsed 1943-08-31 1946-12-10 0 Details
US2411162A Control system Expired / Lapsed 1944-12-05 1946-11-19 0 Details
US2411401A Accelerometer Expired / Lapsed 1942-07-28 1946-11-19 0 Details
US2410014A Heating apparatus Expired / Lapsed 1942-05-15 1946-10-29 0 Details
US2409840A Control system Expired / Lapsed 1944-07-07 1946-10-22 0 Details
US2409895A Electrical positioning system Expired / Lapsed 1943-02-05 1946-10-22 0 Details
US2409891A Variable-speed motor Expired / Lapsed 1942-12-09 1946-10-22 0 Details
US2408868A Carrier-current phase-angle relaying system Expired / Lapsed 1944-05-10 1946-10-08 0 Details
US2408461A Control system Expired / Lapsed 1945-01-01 1946-10-01 0 Details
US2408271A Coaxial terminal assembly Expired / Lapsed 1942-08-12 1946-09-24 0 Details
US2408230A Measuring apparatus Expired / Lapsed 1941-12-09 1946-09-24 0 Details
US2408211A Electrical induction apparatus Expired / Lapsed 1941-02-05 1946-09-24 0 Details
US2406617A Relay system Expired / Lapsed 1944-09-14 1946-08-27 0 Details
US2406615A Carrier-current relaying Expired / Lapsed 1942-12-08 1946-08-27 0 Details
US2406616A Carrier-current protective relaying system Expired / Lapsed 1942-12-08 1946-08-27 0 Details
US2406318A Supervisory apparatus Expired / Lapsed 1942-12-03 1946-08-27 0 Details
US2404982A Relay control circuit Expired / Lapsed 1945-01-13 1946-07-30 0 Details
US2404999A Circuit interrupter Expired / Lapsed 1940-04-24 1946-07-30 0 Details
US2404428A Turbine apparatus Expired / Lapsed 1944-01-31 1946-07-23 0 Details
US2403630A Apparatus for drying fabrics Expired / Lapsed 1943-11-08 1946-07-09 0 Details
US2402363A Turbine apparatus Expired / Lapsed 1943-10-21 1946-06-18 0 Details
US2402084A Continuous reduction of molybdenum compounds Expired / Lapsed 1943-01-07 1946-06-11 0 Details
US2401164A Control system Expired / Lapsed 1944-12-27 1946-05-28 0 Details
US2400777A Electrical power absorber Expired / Lapsed 1942-12-15 1946-05-21 0 Details
US2399338A Method of laminating porous sheet materials Expired / Lapsed 1944-07-07 1946-04-30 0 Details
US2399423A Heating apparatus Expired / Lapsed 1941-08-14 1946-04-30 0 Details
US2399325A High-frequency-oscillation generator or amplifier Expired / Lapsed 1940-03-14 1946-04-30 0 Details
US2398880A Drying apparatus Expired / Lapsed 1944-06-23 1946-04-23 0 Details
US2397539A Remote-control system Expired / Lapsed 1941-08-27 1946-04-02 0 Details
US2397102A Terminal block Expired / Lapsed 1942-10-28 1946-03-26 0 Details
US2394398A Coaxial line seal Expired / Lapsed 1942-03-20 1946-02-05 0 Details
US2394396A Combined air jacket and tuning mechanism for resonators Expired / Lapsed 1941-07-18 1946-02-05 0 Details
US2393021A Signaling system Expired / Lapsed 1944-12-27 1946-01-15 0 Details
US2393060A Control system Expired / Lapsed 1943-12-11 1946-01-15 0 Details
US2393010A Marine friction coupling Expired / Lapsed 1943-01-14 1946-01-15 0 Details
US2392166A Control apparatus Expired / Lapsed 1942-09-11 1946-01-01 0 Details
US2391965A Position regulated gun mount Expired / Lapsed 1942-02-10 1946-01-01 0 Details
US2390805A Method of making metallic articles Expired / Lapsed 1943-03-10 1945-12-11 0 Details
US2389368A Control system Expired / Lapsed 1944-07-20 1945-11-20 0 Details
US2389367A Control system Expired / Lapsed 1944-06-27 1945-11-20 0 Details
US2389098A Method of expanding tubes in tube seats Expired / Lapsed 1942-04-21 1945-11-13 0 Details
US2388639A Control system Expired / Lapsed 1942-05-15 1945-11-06 0 Details
US2387872A Treatment of bearing surfaces with lubricants Expired / Lapsed 1942-04-14 1945-10-30 0 Details
US2387952A Electronic timing system for sorting apparatus Expired / Lapsed 1941-07-29 1945-10-30 0 Details
US2385525A Refrigeration apparatus Expired / Lapsed 1943-02-13 1945-09-25 0 Details
US2385725A Photoelectric control system Expired / Lapsed 1942-05-14 1945-09-25 0 Details
US2384865A Alternating current motor control system Expired / Lapsed 1944-03-09 1945-09-18 0 Details
US2384792A Impulse metering system Expired / Lapsed 1942-12-03 1945-09-18 0 Details
US2383300A Commutator-seasoning apparatus Expired / Lapsed 1943-01-29 1945-08-21 0 Details
US2383311A Contact for copper oxide rectifiers Expired / Lapsed 1942-04-15 1945-08-21 0 Details
US2383283A Stabilizing phenolic resins Expired / Lapsed 1941-08-29 1945-08-21 0 Details
US2383343A Two-cylinder short-wave resonator apparatus Expired / Lapsed 1940-08-13 1945-08-21 0 Details
US2381299A Hygrometer Expired / Lapsed 1943-03-13 1945-08-07 0 Details
US2381246A Induction heating coil Expired / Lapsed 1942-10-31 1945-08-07 0 Details
US2381282A Faulted-phase selector Expired / Lapsed 1942-10-30 1945-08-07 0 Details
US2381320A Electromagnetic apparatus Expired / Lapsed 1940-11-28 1945-08-07 0 Details
US2379132A Control system Expired / Lapsed 1943-07-28 1945-06-26 0 Details
US2377600A Semiconducting composition Expired / Lapsed 1943-02-10 1945-06-05 0 Details
US2376505A Heat exchange apparatus Expired / Lapsed 1943-06-30 1945-05-22 0 Details
US2376808A Transformer differential relay Expired / Lapsed 1943-05-07 1945-05-22 0 Details
US2376785A Adjustable attenuator Expired / Lapsed 1943-02-05 1945-05-22 0 Details
US2376794A Apparatus for separating gases from liquids Expired / Lapsed 1942-12-03 1945-05-22 0 Details
US2374287A Photoelectric device Expired / Lapsed 1941-11-19 1945-04-24 0 Details
US2373997A Voltage limiting circuit Expired / Lapsed 1942-07-04 1945-04-17 0 Details
US2372048A Phenolic resin embodying glass fibers Expired / Lapsed 1941-06-27 1945-03-20 0 Details
US2372074A Bonded laminated magnetic material Expired / Lapsed 1940-04-26 1945-03-20 0 Details
US2370056A Electric position indicator Expired / Lapsed 1942-07-04 1945-02-20 0 Details
US2367965A Electrical measuring device Expired / Lapsed 1941-11-21 1945-01-23 0 Details
US2367924A Vacuum tube oscillator Expired / Lapsed 1941-07-24 1945-01-23 0 Details
US2367570A Electric tube Expired / Lapsed 1943-07-08 1945-01-16 0 Details
US2365614A Luminaire Expired / Lapsed 1943-03-13 1944-12-19 0 Details
US2365564A Torque measuring device for shafts Expired / Lapsed 1942-11-19 1944-12-19 0 Details
US2365565A Power measuring system for rotating shafts Expired / Lapsed 1942-11-19 1944-12-19 0 Details
US2365553A Method of analysis with radioactive material Expired / Lapsed 1942-06-17 1944-12-19 0 Details
US2365610A Control apparatus Expired / Lapsed 1941-06-24 1944-12-19 0 Details
US2365587A Lighting apparatus Expired / Lapsed 1939-12-13 1944-12-19 0 Details
US2363347A Calibrating tool Expired / Lapsed 1944-01-07 1944-11-21 0 Details
US2363373A Shaft vibration pickup Expired / Lapsed 1942-03-05 1944-11-21 0 Details
US2363326A Electric heating apparatus Expired / Lapsed 1940-12-12 1944-11-21 0 Details
US2361245A Vacuum pump Expired / Lapsed 1943-03-27 1944-10-24 0 Details
US2361221A Automatically reclosing circuit interrupter Expired / Lapsed 1942-03-05 1944-10-24 0 Details
US2357909A Apparatus for cleansing fabrics and the like Expired / Lapsed 1940-06-01 1944-09-12 0 Details
US2356051A Variable-speed drive Expired / Lapsed 1942-10-30 1944-08-15 0 Details
US2356071A Multivibrator Expired / Lapsed 1942-07-11 1944-08-15 0 Details
US2354642A Shockproof base Expired / Lapsed 1943-07-01 1944-08-01 0 Details
US2354097A Direct-current motor Expired / Lapsed 1942-09-18 1944-07-18 0 Details
US2353240A Air conditioning apparatus Expired / Lapsed 1940-08-03 1944-07-11 0 Details
US2351499A Discharge lamp starting circuit Expired / Lapsed 1941-09-27 1944-06-13 0 Details
US2349687A Electromagnetic-inspection system Expired / Lapsed 1942-05-13 1944-05-23 0 Details
US2349663A Torsional measuring device Expired / Lapsed 1942-04-17 1944-05-23 0 Details
US2349632A Automatic reclosing breaker Expired / Lapsed 1941-12-19 1944-05-23 0 Details
US2346997A Voltage regulator Expired / Lapsed 1940-05-31 1944-04-18 0 Details
US2345116A Machine tool tracer regulator Expired / Lapsed 1940-07-24 1944-03-28 0 Details
US2345090A Mercury detecting method and apparatus Expired / Lapsed 1940-04-10 1944-03-28 0 Details
US2344552A Electric discharge device Expired / Lapsed 1942-02-07 1944-03-21 0 Details
US2342756A Dynamic braking system Expired / Lapsed 1942-10-30 1944-02-29 0 Details
US2342816A Latching mechanism Expired / Lapsed 1942-05-15 1944-02-29 0 Details
US2342767A Control system Expired / Lapsed 1942-02-21 1944-02-29 0 Details
US2343122A Air conditioning apparatus Expired / Lapsed 1941-11-21 1944-02-29 0 Details
US2342753A Counting system Expired / Lapsed 1941-09-27 1944-02-29 0 Details
US2342821A Reclosing circuit breaker system Expired / Lapsed 1940-11-13 1944-02-29 0 Details
US2343121A Air conditioning apparatus Expired / Lapsed 1940-07-27 1944-02-29 0 Details
US2340967A Electron discharge device Expired / Lapsed 1942-02-12 1944-02-08 0 Details
US2340098A Contact rectifier Expired / Lapsed 1941-12-09 1944-01-25 0 Details
US2340061A Electric discharge apparatus Expired / Lapsed 1941-08-13 1944-01-25 0 Details
US2339750A Time delay circuit Expired / Lapsed 1941-04-11 1944-01-25 0 Details
US2340050A Circuit interrupter Expired / Lapsed 1940-11-13 1944-01-25 0 Details
US2338512A Telephone transmitter circuit Expired / Lapsed 1942-10-22 1944-01-04 0 Details
US2338480A Bearing material and bearing Expired / Lapsed 1940-06-28 1944-01-04 0 Details
US2337830A Protective pilot wire control system Expired / Lapsed 1942-05-13 1943-12-28 0 Details
US2337833A Reflector lamp Expired / Lapsed 1940-09-27 1943-12-28 0 Details
US2337130A Circuit controller Expired / Lapsed 1942-02-06 1943-12-21 0 Details
US2336946A Method and apparatus for coating envelopes for electric lam… Expired / Lapsed 1941-12-10 1943-12-14 0 Details
US2333725A Photoflash casing Expired / Lapsed 1941-05-14 1943-11-09 0 Details
US2333604A Circuit interrupter Expired / Lapsed 1941-06-24 1943-11-02 0 Details
US2331167A Explosion-type pulier Expired / Lapsed 1942-05-23 1943-10-05 0 Details
US2331255A Switchgear apparatus Expired / Lapsed 1941-12-30 1943-10-05 0 Details
US2331190A Mass spectrometer Expired / Lapsed 1940-08-02 1943-10-05 0 Details
US2330062A Silver-copper solder alloy Expired / Lapsed 1941-09-24 1943-09-21 0 Details
US2330055A Timing device and welding system Expired / Lapsed 1940-11-19 1943-09-21 0 Details
US2329090A Timing system Expired / Lapsed 1941-12-26 1943-09-07 0 Details
US2328256A Laundry apparatus Expired / Lapsed 1941-05-13 1943-08-31 0 Details
US2327251A Supervisory control and telemetering system Expired / Lapsed 1941-07-29 1943-08-17 0 Details
US2327268A Electric discharge apparatus Expired / Lapsed 1939-08-11 1943-08-17 0 Details
US2326208A Control mechanism Expired / Lapsed 1941-12-01 1943-08-10 0 Details
US2326696A Blasting machine Expired / Lapsed 1940-04-30 1943-08-10 0 Details
US2326033A Apparatus for vibration testing Expired / Lapsed 1940-08-02 1943-08-03 0 Details
US2323729A Means for tuning short-wave hollow-body resonator apparatus Expired / Lapsed 1940-08-13 1943-07-06 0 Details
US2323724A High velocity tensile machinery Expired / Lapsed 1940-07-12 1943-07-06 0 Details
US2323650A Electric discharge apparatus Expired / Lapsed 1938-05-07 1943-07-06 0 Details
US2323115A Hydraulic resistance apparatus Expired / Lapsed 1942-05-20 1943-06-29 0 Details
US2320929A Transformer protection Expired / Lapsed 1942-04-09 1943-06-01 0 Details
US2320398A Cooling high temperature bolting Expired / Lapsed 1941-08-30 1943-06-01 0 Details
US2320922A High-voltage coil insulation Expired / Lapsed 1940-10-16 1943-06-01 0 Details
US2320900A Bimetallic clutch Expired / Lapsed 1940-08-13 1943-06-01 0 Details
US2319378A Stabilizer system Expired / Lapsed 1941-10-09 1943-05-18 0 Details
US2318061A Automatic bias circuits Expired / Lapsed 1941-05-29 1943-05-04 0 Details
US2318279A Compensating arrangement for thermal relays Expired / Lapsed 1940-11-27 1943-05-04 0 Details
US2316624A Apparatus for determination of moisture in gases Expired / Lapsed 1939-09-30 1943-04-13 0 Details
US2315287A Testing machine Expired / Lapsed 1940-11-30 1943-03-30 0 Details
US2314692A Control system Expired / Lapsed 1940-07-26 1943-03-23 0 Details
US2313984A Cleaning apparatus Expired / Lapsed 1941-04-25 1943-03-16 0 Details
US2313978A Oscillograph viewing device Expired / Lapsed 1940-04-24 1943-03-16 0 Details
US2311520A Coupling loop Expired / Lapsed 1941-08-13 1943-02-16 0 Details
US2310138A Electrical switching apparatus Expired / Lapsed 1941-10-23 1943-02-02 0 Details
US2310076A Signaling system Expired / Lapsed 1940-03-05 1943-02-02 0 Details
US2310092A Electric discharge apparatus Expired / Lapsed 1937-01-16 1943-02-02 0 Details
US2308609A Self-aligning bearing Expired / Lapsed 1940-07-06 1943-01-19 0 Details
US2307512A Process of making copper base alloys Expired / Lapsed 1941-11-05 1943-01-05 0 Details
US2307514A Geared limit switch Expired / Lapsed 1941-04-11 1943-01-05 0 Details
US2307077A Motor control system Expired / Lapsed 1940-07-19 1943-01-05 0 Details
US2303453A Welding timer Expired / Lapsed 1939-05-05 1942-12-01 0 Details
US2303455A Supervising arrangement for relay systems Expired / Lapsed 1938-06-24 1942-12-01 0 Details
US2300999A Electromagnetic inspection system Expired / Lapsed 1940-10-30 1942-11-03 0 Details
US2300957A Electric motor construction Expired / Lapsed 1940-04-17 1942-11-03 0 Details
US2297836A Automatic temperature regulation Expired / Lapsed 1941-02-26 1942-10-06 0 Details
US2297740A Voltage-regulating equipment for precipitators or the like Expired / Lapsed 1940-10-26 1942-10-06 0 Details
US2298114A Spark gap device Expired / Lapsed 1940-08-03 1942-10-06 0 Details
US2298216A Weight indicator for rotary drilling Expired / Lapsed 1939-09-26 1942-10-06 0 Details
US2298210A Seam welding timer Expired / Lapsed 1939-07-13 1942-10-06 0 Details
US2296266A Liquid mixing device Expired / Lapsed 1940-11-22 1942-09-22 0 Details
US2296258A Method of cleaning fabrics or the like Expired / Lapsed 1940-06-11 1942-09-22 0 Details
US2296260A Apparatus for washing fabrics or the like Expired / Lapsed 1938-08-26 1942-09-22 0 Details
US2296741A Air conditioning apparatus Expired / Lapsed 1938-07-02 1942-09-22 0 Details
US2295355A Electrical apparatus Expired / Lapsed 1941-02-18 1942-09-08 0 Details
US2295412A Radio direction finder Expired / Lapsed 1940-01-26 1942-09-08 0 Details
US2293951A Induction apparatus and method of core construction therefor Expired / Lapsed 1939-09-20 1942-08-25 0 Details
US2292118A Molded article Expired / Lapsed 1940-07-24 1942-08-04 0 Details
US2292145A Electrical apparatus Expired / Lapsed 1940-07-20 1942-08-04 0 Details
US2292072A Turbine blade vibration damper Expired / Lapsed 1940-01-10 1942-08-04 0 Details
US2288788A Method of treating the heat-responsive elements of thermost… Expired / Lapsed 1940-11-22 1942-07-07 0 Details
US2289152A Method of assembling thermoelectric generators Expired / Lapsed 1939-06-13 1942-07-07 0 Details
US2286820A Regulator Expired / Lapsed 1941-08-13 1942-06-16 0 Details
US2286180A Remote metering system Expired / Lapsed 1941-05-13 1942-06-09 0 Details
US2285691A Switching device Expired / Lapsed 1940-11-25 1942-06-09 0 Details
US2285687A Reversing means for single-phase motors Expired / Lapsed 1940-08-05 1942-06-09 0 Details
US2285622A Ion source Expired / Lapsed 1940-06-14 1942-06-09 0 Details
US2285658A Instrument cover Expired / Lapsed 1940-01-10 1942-06-09 0 Details
US2285677A Time delay relay Expired / Lapsed 1939-12-28 1942-06-09 0 Details
US2286161A Electrical resistance unit Expired / Lapsed 1939-12-19 1942-06-09 0 Details
US2285580A Portable dynamometer Expired / Lapsed 1939-11-15 1942-06-09 0 Details
US2283928A Air conditioning apparatus Expired / Lapsed 1936-04-23 1942-05-26 0 Details
US2282226A Control means for industrial heattreating furnaces Expired / Lapsed 1941-09-09 1942-05-05 0 Details
US2282235A Hydrocarbon gas treatment for electrographitic material Expired / Lapsed 1940-11-23 1942-05-05 0 Details
US2282198A Photoelectric differential analyzer Expired / Lapsed 1939-07-13 1942-05-05 0 Details
US2280898A Capacitor tripping device for circuit breakers Expired / Lapsed 1939-07-14 1942-04-28 0 Details
US2280144A Signaling system Expired / Lapsed 1940-07-19 1942-04-21 0 Details
US2280448A Treating and testing apparatus Expired / Lapsed 1939-12-01 1942-04-21 0 Details
US2279831A Discharge device and method of making Expired / Lapsed 1941-04-30 1942-04-14 0 Details
US2279168A Process for kovar-glass seals Expired / Lapsed 1940-02-29 1942-04-07 0 Details
US2277883A Rheostat Expired / Lapsed 1940-01-24 1942-03-31 0 Details
US2277111A Low-bounce contact device and the like Expired / Lapsed 1940-08-16 1942-03-24 0 Details
US2277482A Photoflash lamp Expired / Lapsed 1940-01-26 1942-03-24 0 Details
US2276646A Supervisory control system Expired / Lapsed 1939-01-18 1942-03-17 0 Details
US2276647A Manufacture of copper-oxide rectifiers Expired / Lapsed 1938-12-22 1942-03-17 0 Details
US2275989A Process for producing resinous products Expired / Lapsed 1938-09-14 1942-03-10 0 Details
US2274400A Manufacture of photoflash lamps Expired / Lapsed 1940-01-26 1942-02-24 0 Details
US2273213A Method of charging refrigerating systems Expired / Lapsed 1940-05-16 1942-02-17 0 Details
US2273435A Flash lamp Expired / Lapsed 1939-10-30 1942-02-17 0 Details
US2270799A Electric discharge apparatus Expired / Lapsed 1939-03-31 1942-01-20 0 Details
US2270162A Photoflash lamp Expired / Lapsed 1940-01-26 1942-01-13 0 Details
US2265296A Magnetic modulator Expired / Lapsed 1940-08-16 1941-12-09 0 Details
US2265025A Electromagnetic inspection system Expired / Lapsed 1940-09-27 1941-12-02 0 Details
US2264725A Thickness gauge for rolling mills Expired / Lapsed 1940-08-02 1941-12-02 0 Details
US2264726A Pointer structure Expired / Lapsed 1940-04-04 1941-12-02 0 Details
US2265037A Photoelectric inspection device Expired / Lapsed 1939-09-07 1941-12-02 0 Details
US2265011A Sensitive device for measuring forces Expired / Lapsed 1939-07-26 1941-12-02 0 Details
US2264280A Control system for circuit breakers Expired / Lapsed 1939-07-25 1941-12-02 0 Details
US2264710A Electric appliance handle Expired / Lapsed 1939-07-13 1941-12-02 0 Details
US2264175A Control system Expired / Lapsed 1935-07-31 1941-11-25 0 Details
US2261983A Bonding of transformer laminations Expired / Lapsed 1940-04-10 1941-11-11 0 Details
US2262417A Starting means for capacitor motors Expired / Lapsed 1940-01-26 1941-11-11 0 Details
US2262365A Ultra-high-frequency tank circuit Expired / Lapsed 1939-10-03 1941-11-11 0 Details
US2262362A Register regulator Expired / Lapsed 1939-09-07 1941-11-11 0 Details
US2262650A Alarm system Expired / Lapsed 1938-09-08 1941-11-11 0 Details
US2262416A Combination lighting unit Expired / Lapsed 1938-02-26 1941-11-11 0 Details
US2261686A Circuit interrupter Expired / Lapsed 1938-12-17 1941-11-04 0 Details
US2259329A Protective system for vapor electric devices Expired / Lapsed 1940-08-02 1941-10-14 0 Details
US2259331A Protective system for gaseous discharge devices Expired / Lapsed 1938-08-25 1941-10-14 0 Details
US2259318A Ultra high frequency for therapeutic purposes Expired / Lapsed 1937-04-24 1941-10-14 0 Details
US2254269A Washing apparatus Expired / Lapsed 1938-08-30 1941-09-02 0 Details
US2254604A Cabinet construction Expired / Lapsed 1938-01-26 1941-09-02 0 Details
US2253393A Method of connecting carrier frequency to a double circuit Expired / Lapsed 1939-02-04 1941-08-19 0 Details
US2252589A Glass making Expired / Lapsed 1939-09-01 1941-08-12 0 Details
US2249857A Control system Expired / Lapsed 1940-09-27 1941-07-22 0 Details
US2249610A Method and apparatus for medical purposes Expired / Lapsed 1936-06-13 1941-07-15 0 Details
US2246317A Sandwich grill Expired / Lapsed 1940-07-31 1941-06-17 0 Details
US2246324A Overload protective relay Expired / Lapsed 1939-09-07 1941-06-17 0 Details
US2246329A Heat absorber Expired / Lapsed 1939-06-13 1941-06-17 0 Details
US2246294A Control system Expired / Lapsed 1939-04-25 1941-06-17 0 Details
US2245755A Headlight with indicator Expired / Lapsed 1937-12-09 1941-06-17 0 Details
US2242343A Reversible capacttor motor Expired / Lapsed 1940-04-13 1941-05-20 0 Details
US2242894A Control system Expired / Lapsed 1939-06-30 1941-05-20 0 Details
US2243040A Circuit interrupter Expired / Lapsed 1939-03-22 1941-05-20 0 Details
US2240677A Protective relay Expired / Lapsed 1938-10-22 1941-05-06 0 Details
US2239552A Remote metering system Expired / Lapsed 1939-07-25 1941-04-22 0 Details
US2238624A Off-peak water heater control Expired / Lapsed 1939-01-12 1941-04-15 0 Details
US2237780A Turbine governor Expired / Lapsed 1939-03-08 1941-04-08 0 Details
US2237121A Turbine blade shrouding Expired / Lapsed 1939-09-26 1941-04-01 0 Details
US2236190A Air conditioning apparatus Expired / Lapsed 1935-02-06 1941-03-25 0 Details
US2235504A Ignitron starter Expired / Lapsed 1939-04-19 1941-03-18 0 Details
US2235393A Crankshaft balancing Expired / Lapsed 1939-02-25 1941-03-18 0 Details
US2234560A Covered wire Expired / Lapsed 1938-11-16 1941-03-11 0 Details
US2234834A Electrical contact Expired / Lapsed 1937-10-09 1941-03-11 0 Details
US2233810A Electric discharge apparatus Expired / Lapsed 1938-01-28 1941-03-04 0 Details
US2231999A Discharge lamp and circuit Expired / Lapsed 1938-04-23 1941-02-18 0 Details
US2231521A Control system for alternating current marine propulsion ap… Expired / Lapsed 1940-03-08 1941-02-11 0 Details
US2231702A Strain gauge Expired / Lapsed 1939-02-25 1941-02-11 0 Details
US2231695A Resistance heater Expired / Lapsed 1937-12-23 1941-02-11 0 Details
US2231806A Radio apparatus Expired / Lapsed 1927-06-10 1941-02-11 0 Details
US2228084A Radio receiving system Expired / Lapsed 1939-02-18 1941-01-07 0 Details
US2228090A Tachometer Expired / Lapsed 1939-01-18 1941-01-07 0 Details
US2228078A Reversing control for alternating-current motors Expired / Lapsed 1938-10-27 1941-01-07 0 Details
US2224321A Hydraulic governing apparatus Expired / Lapsed 1938-03-02 1940-12-10 0 Details
US2224724A Carbon brush and method of making Expired / Lapsed 1938-02-17 1940-12-10 0 Details
US2223737A Shield for electrical apparatus Expired / Lapsed 1938-12-22 1940-12-03 0 Details
US2221616A Copper oxide rectifier Expired / Lapsed 1939-09-19 1940-11-12 0 Details
US2221579A Voltage regulator Expired / Lapsed 1939-05-16 1940-11-12 0 Details
US2221569A Direct current welding with tube control Expired / Lapsed 1938-07-20 1940-11-12 0 Details
US2217477A Phase difference indicator Expired / Lapsed 1939-06-23 1940-10-08 0 Details
US2217480A Pilot-channel relaying and communication system Expired / Lapsed 1939-03-31 1940-10-08 0 Details
US2217496A Connector Expired / Lapsed 1938-11-16 1940-10-08 0 Details
US2217435A Direct-current measuring device Expired / Lapsed 1938-05-21 1940-10-08 0 Details
US2217422A Glass-metal seal Expired / Lapsed 1936-04-24 1940-10-08 0 Details
US2215544A Machine to play game of nim Expired / Lapsed 1940-04-26 1940-09-24 0 Details
US2214600A Lighting unit Expired / Lapsed 1937-12-30 1940-09-10 0 Details
US2214595A Illuminated dial instrument Expired / Lapsed 1937-09-03 1940-09-10 0 Details
US2214617A Control system for reversible mills Expired / Lapsed 1937-05-22 1940-09-10 0 Details
US2208406A Cathode ray tube Expired / Lapsed 1938-08-17 1940-07-16 0 Details
US2205252A Induction-motor braking Expired / Lapsed 1938-10-21 1940-06-18 0 Details
US2203364A Sealing means for high pressure heads Expired / Lapsed 1938-12-15 1940-06-04 0 Details
US2202803A Refrigeration apparatus Expired / Lapsed 1938-04-30 1940-05-28 0 Details
US2201248A Reciprocating fluid motor apparatus Expired / Lapsed 1938-12-09 1940-05-21 0 Details
US2201840A Method of treating asbestos Expired / Lapsed 1938-02-17 1940-05-21 0 Details
US2199639A Load limiting means for an electrical system Expired / Lapsed 1938-11-12 1940-05-07 0 Details
US2200103A Phase indicating means Expired / Lapsed 1938-04-21 1940-05-07 0 Details
US2199626A Circuit breaker Expired / Lapsed 1936-10-21 1940-05-07 0 Details
US2196418A Overload protective scheme Expired / Lapsed 1937-12-23 1940-04-09 0 Details
US2196402A Motor control system Expired / Lapsed 1937-08-13 1940-04-09 0 Details
US2196407A Gasket material Expired / Lapsed 1936-05-06 1940-04-09 0 Details
US2195006A Register regulator control Expired / Lapsed 1938-04-14 1940-03-26 0 Details
US2193590A Antimicrophonic phototube circuit Expired / Lapsed 1939-05-05 1940-03-12 0 Details
US2188303A Refrigeration test method Expired / Lapsed 1937-11-27 1940-01-30 0 Details
US2186247A Noise suppression circuits Expired / Lapsed 1937-09-16 1940-01-09 0 Details
US2186268A Recording oscillographic apparatus Expired / Lapsed 1937-01-21 1940-01-09 0 Details
US2185292A Impulse voltage testing equipment Expired / Lapsed 1938-08-13 1940-01-02 0 Details
US2184828A Cooking surface and method of treating the same Expired / Lapsed 1938-05-21 1939-12-26 0 Details
US2182637A Relay timing circuits and systems Expired / Lapsed 1937-11-24 1939-12-05 0 Details
US2181855A Refrigeration method Expired / Lapsed 1937-04-30 1939-11-28 0 Details
US2179299A Self-regulating battery charger Expired / Lapsed 1938-09-14 1939-11-07 0 Details
US2179293A Cooled contact rectifier Expired / Lapsed 1938-08-25 1939-11-07 0 Details
US2179292A Liquid pressure control apparatus Expired / Lapsed 1938-08-25 1939-11-07 0 Details
US2179353A Voltage stabilizing network Expired / Lapsed 1937-03-20 1939-11-07 0 Details
US2175869A Electronic apparatus Expired / Lapsed 1936-09-05 1939-10-10 0 Details
US2175889A Overload protective means Expired / Lapsed 1936-06-20 1939-10-10 0 Details
US2171747A Speed regulator Expired / Lapsed 1937-03-30 1939-09-05 0 Details
US2169023A Power control system Expired / Lapsed 1935-01-31 1939-08-08 0 Details
US2167442A Refrigeration apparatus Expired / Lapsed 1936-06-18 1939-07-25 0 Details
US2165480A Refrigerating apparatus Expired / Lapsed 1936-10-30 1939-07-11 0 Details
US2165048A Electric discharge apparatus Expired / Lapsed 1937-08-26 1939-07-04 0 Details
US2165024A Indicating balancing machine Expired / Lapsed 1935-10-23 1939-07-04 0 Details
US2162487A Selenium rectifier Expired / Lapsed 1937-08-20 1939-06-13 0 Details
US2157925A Electric discharge apparatus Expired / Lapsed 1937-03-13 1939-05-09 0 Details
US2157888A Electric discharge apparatus Expired / Lapsed 1937-02-27 1939-05-09 0 Details
US2157843A Electrical contactor Expired / Lapsed 1936-08-28 1939-05-09 0 Details
US2154669A Automatic reclosing circuit breaker system Expired / Lapsed 1937-01-21 1939-04-18 0 Details
US2154703A Circuit interrupter Expired / Lapsed 1935-09-12 1939-04-18 0 Details
US2154261A Immersion heater Expired / Lapsed 1937-12-17 1939-04-11 0 Details
US2154260A Electronic metering system Expired / Lapsed 1936-03-05 1939-04-11 0 Details
US2151749A Welding control system with polarizing relay Expired / Lapsed 1937-11-06 1939-03-28 0 Details
US2151756A Metal-clad switch gear Expired / Lapsed 1937-10-09 1939-03-28 0 Details
US2151752A Compensator Expired / Lapsed 1937-01-09 1939-03-28 0 Details
US2147472A High current impulse device Expired / Lapsed 1937-08-20 1939-02-14 0 Details
US2147421A Speed regulator Expired / Lapsed 1937-03-06 1939-02-14 0 Details
US2144494A Carrier current relaying Expired / Lapsed 1937-12-01 1939-01-17 0 Details
US2144519A Radiant energy detector Expired / Lapsed 1937-03-06 1939-01-17 0 Details
US2144558A Vacuum-tight insulated lead-in structure Expired / Lapsed 1937-02-20 1939-01-17 0 Details
US2141059A Television system Expired / Lapsed 1923-12-29 1938-12-20 0 Details
US2140373A Light-sensitive system Expired / Lapsed 1936-09-23 1938-12-13 0 Details
US2140348A Electronic cooking device Expired / Lapsed 1936-07-31 1938-12-13 0 Details
US2140356A Submersible pump set seal Expired / Lapsed 1936-06-26 1938-12-13 0 Details
US2140368A Radio receiver Expired / Lapsed 1936-05-19 1938-12-13 0 Details
US2140355A Control apparatus Expired / Lapsed 1935-07-16 1938-12-13 0 Details
US2137071A Speed regulating system Expired / Lapsed 1937-09-23 1938-11-15 0 Details
US2137097A Joint structure and method of making the same Expired / Lapsed 1936-02-27 1938-11-15 0 Details
US2133958A Humidity control for refrigerators Expired / Lapsed 1937-01-21 1938-10-25 0 Details
US2133950A Refrigerating apparatus and method Expired / Lapsed 1936-10-28 1938-10-25 0 Details
US2126398A Electric discharge apparatus Expired / Lapsed 1935-10-03 1938-08-09 0 Details
US2125138A Transformer cooling system Expired / Lapsed 1936-05-29 1938-07-26 0 Details
US2117894A Remote metering system Expired / Lapsed 1935-04-13 1938-05-17 0 Details
US2117878A Guide control means for web material Expired / Lapsed 1934-08-24 1938-05-17 0 Details
US2114883A Automatic time delay Expired / Lapsed 1936-10-21 1938-04-19 0 Details
US2114827A Battery charging regulator Expired / Lapsed 1935-09-26 1938-04-19 0 Details
US2113328A Radio tube base and socket Expired / Lapsed 1933-04-21 1938-04-05 0 Details
US2109215A Regulating system Expired / Lapsed 1935-12-24 1938-02-22 0 Details
US2106831A Electric control system Expired / Lapsed 1935-04-10 1938-02-01 0 Details
US2095754A High-speed ratio-differential relay Expired / Lapsed 1936-05-02 1937-10-12 0 Details
US2095744A Cinematographic apparatus Expired / Lapsed 1935-06-19 1937-10-12 0 Details
US2094363A High voltage direct current contactor Expired / Lapsed 1936-12-17 1937-09-28 0 Details
US2094361A High voltage direct current contactor Expired / Lapsed 1935-07-16 1937-09-28 0 Details
US2094379A Control for electric vacuum discharge apparatus Expired / Lapsed 1933-01-25 1937-09-28 0 Details
US2088477A Temperature control system Expired / Lapsed 1935-10-03 1937-07-27 0 Details
US2088490A Power translating device Expired / Lapsed 1934-12-14 1937-07-27 0 Details
US2085080A Transformer case structure Expired / Lapsed 1935-12-13 1937-06-29 0 Details
US2082038A Remote signaling system Expired / Lapsed 1934-11-08 1937-06-01 0 Details
US2081684A Metering system Expired / Lapsed 1932-04-15 1937-05-25 0 Details
US2070321A Electrical contact for rectifiers Expired / Lapsed 1934-03-30 1937-02-09 0 Details
US2070305A Circuit interrupter Expired / Lapsed 1934-01-03 1937-02-09 0 Details
US2066919A Regulating system Expired / Lapsed 1935-10-15 1937-01-05 0 Details
US2066943A Regulating system Expired / Lapsed 1935-07-31 1937-01-05 0 Details
US2063981A Protective system for polyphase motors Expired / Lapsed 1934-05-19 1936-12-15 0 Details
US2063706A Method of manufacturing blades Expired / Lapsed 1935-06-14 1936-12-08 0 Details
US2062335A Glass metal seal Expired / Lapsed 1929-07-05 1936-12-01 0 Details
US2060755A Program-starting system Expired / Lapsed 1936-01-30 1936-11-10 0 Details
US2060494A Automatic circuit breaker reclosing mechanism Expired / Lapsed 1934-11-13 1936-11-10 0 Details
US2060500A Light relay Expired / Lapsed 1934-03-30 1936-11-10 0 Details
US2057499A Vacuum cleaner Expired / Lapsed 1934-12-20 1936-10-13 0 Details
US2057452A Glass-to-metal seal Expired / Lapsed 1934-01-31 1936-10-13 0 Details
US2053417A Arc welding apparatus Expired / Lapsed 1933-11-11 1936-09-08 0 Details
US2053445A Electrical control system Expired / Lapsed 1933-06-29 1936-09-08 0 Details
US2050277A Circuit breaker Expired / Lapsed 1934-08-15 1936-08-11 0 Details
US2050276A Position finding system Expired / Lapsed 1931-07-09 1936-08-11 0 Details
US2047827A Control mechanism Expired / Lapsed 1934-03-23 1936-07-14 0 Details
US2046714A Color matcher Expired / Lapsed 1934-07-19 1936-07-07 0 Details
US2044147A Remote control thermostat Expired / Lapsed 1934-06-27 1936-06-16 0 Details
US2044134A Transportation apparatus Expired / Lapsed 1932-10-29 1936-06-16 0 Details
US2042234A Electric control system Expired / Lapsed 1935-08-24 1936-05-26 0 Details
US2041079A Relay Expired / Lapsed 1930-07-30 1936-05-19 0 Details
US2036298A Contact-making demand meter Expired / Lapsed 1935-01-02 1936-04-07 0 Details
US2036268A Regulating system Expired / Lapsed 1934-11-08 1936-04-07 0 Details
US2036223A Means for indicating the blowing of high-tension fuses Expired / Lapsed 1931-04-02 1936-04-07 0 Details
US2032904A Lightning-stroke generator Expired / Lapsed 1935-10-03 1936-03-03 0 Details
US2030100A Electric discharge apparatus Expired / Lapsed 1934-05-11 1936-02-11 0 Details
US2027226A Impedance relay system Expired / Lapsed 1933-07-26 1936-01-07 0 Details
US2021888A Electric discharge apparatus Expired / Lapsed 1933-06-29 1935-11-26 0 Details
US2020925A Card sorting machine Expired / Lapsed 1933-06-02 1935-11-12 0 Details
US2020913A Distribution apparatus Expired / Lapsed 1933-04-22 1935-11-12 0 Details
US2013815A Directional relay element Expired / Lapsed 1934-05-11 1935-09-10 0 Details
US2011608A Automatic weighing machine Expired / Lapsed 1932-05-25 1935-08-20 0 Details
US2008407A Inverted-refrigeration plant Expired / Lapsed 1932-04-28 1935-07-16 0 Details
US2005875A Ignition system Expired / Lapsed 1934-02-14 1935-06-25 0 Details
US2005891A Valve-operated mechanism Expired / Lapsed 1933-09-27 1935-06-25 0 Details
US2005884A Electrical measuring and regulating system Expired / Lapsed 1933-07-26 1935-06-25 0 Details
US2005892A Alternating-current regulator Expired / Lapsed 1931-10-13 1935-06-25 0 Details
US2003027A Control for shearing apparatus Expired / Lapsed 1934-05-26 1935-05-28 0 Details
US2001450A Transmitting circuit Expired / Lapsed 1926-09-16 1935-05-14 0 Details
US1997628A Modulation of light beams Expired / Lapsed 1933-07-26 1935-04-16 0 Details
US1997671A Propeller Expired / Lapsed 1930-10-30 1935-04-16 0 Details
US1994903A Radiator and method of making the same Expired / Lapsed 1931-01-06 1935-03-19 0 Details
US1991066A Regulating system Expired / Lapsed 1933-09-27 1935-02-12 0 Details
US1986863A Cooling and dehumidifying system Expired / Lapsed 1932-11-30 1935-01-08 0 Details
US1985003A Speed control Expired / Lapsed 1933-05-27 1934-12-18 0 Details
US1985051A Control system Expired / Lapsed 1931-04-17 1934-12-18 0 Details
US1985035A Card sorter Expired / Lapsed 1930-11-05 1934-12-18 0 Details
US1982341A Traffic control system Expired / Lapsed 1931-03-24 1934-11-27 0 Details
US1981040A Regulating system Expired / Lapsed 1932-11-12 1934-11-20 0 Details
US1979722A Sorting apparatus Expired / Lapsed 1930-07-30 1934-11-06 0 Details
US1977380A High speed keyer Expired / Lapsed 1932-09-30 1934-10-16 0 Details
US1977181A Combustion apparatus Expired / Lapsed 1931-07-27 1934-10-16 0 Details
US1975164A Grid-controlled mercury arc tube Expired / Lapsed 1933-05-27 1934-10-02 0 Details
US1973123A Power supply system Expired / Lapsed 1932-03-19 1934-09-11 0 Details
US1971836A High power fuse Expired / Lapsed 1932-04-15 1934-08-28 0 Details
US1966216A Constant potential supply for electric-discharge devices Expired / Lapsed 1932-07-30 1934-07-10 0 Details
US1963185A Phototube Expired / Lapsed 1931-03-24 1934-06-19 0 Details
US1960217A Method for the control of gridglow tubes Expired / Lapsed 1932-09-30 1934-05-22 0 Details
US1958893A Photosensitive apparatus Expired / Lapsed 1930-10-24 1934-05-15 0 Details
US1955334A Variable-voltage reversing-planer controller Expired / Lapsed 1930-12-19 1934-04-17 0 Details
US1955332A View transmission system Expired / Lapsed 1930-03-05 1934-04-17 0 Details
US1955320A Television synchronization method Expired / Lapsed 1929-11-16 1934-04-17 0 Details
US1953216A Insulating liquid Expired / Lapsed 1932-11-05 1934-04-03 0 Details
US1944756A Regulating system Expired / Lapsed 1932-06-10 1934-01-23 0 Details
US1944751A Light control system Expired / Lapsed 1930-07-18 1934-01-23 0 Details
US1944762A Expulsion fuse Expired / Lapsed 1929-09-26 1934-01-23 0 Details
US1942260A Alloy Expired / Lapsed 1929-07-05 1934-01-02 0 Details
US1940882A Sorting apparatus Expired / Lapsed 1930-07-30 1933-12-26 0 Details
US1939443A Regulator system Expired / Lapsed 1931-05-26 1933-12-12 0 Details
US1939609A Relay protective system Expired / Lapsed 1931-05-23 1933-12-12 0 Details
US1939532A Kerr cell Expired / Lapsed 1930-11-26 1933-12-12 0 Details
US1939088A Photosensitive apparatus Expired / Lapsed 1930-07-30 1933-12-12 0 Details
US1939067A Instantaneous pressure recorder Expired / Lapsed 1929-01-05 1933-12-12 0 Details
US1936789A Frequency multiplier Expired / Lapsed 1929-08-15 1933-11-28 0 Details
US1934322A Cathode ray oscilloscope Expired / Lapsed 1932-06-10 1933-11-07 0 Details
US1932084A Cathode ray oscillograph Expired / Lapsed 1929-08-14 1933-10-24 0 Details
US1930518A Electrostatic loud speaker Expired / Lapsed 1930-07-30 1933-10-17 0 Details
US1925882A Varying speed of capacitor motors Expired / Lapsed 1931-01-22 1933-09-05 0 Details
US1924294A Apparatus and method of extruding pipe Expired / Lapsed 1930-06-12 1933-08-29 0 Details
US1922258A Portable electric tool Expired / Lapsed 1930-05-31 1933-08-15 0 Details
US1922193A Signal transmission system Expired / Lapsed 1927-07-30 1933-08-15 0 Details
US1922188A Inspection device Expired / Lapsed 1927-06-16 1933-08-15 0 Details
US1916404A Transmitting system Expired / Lapsed 1929-06-18 1933-07-04 0 Details
US1911356A Motor control system Expired / Lapsed 1930-02-15 1933-05-30 0 Details
US1909142A Facsimile receiver Expired / Lapsed 1930-01-20 1933-05-16 0 Details
US1909103A Precision frequency system Expired / Lapsed 1927-12-31 1933-05-16 0 Details
US1907517A Regulating system Expired / Lapsed 1932-04-19 1933-05-09 0 Details
US1907984A Electrodeposition of porcelain Expired / Lapsed 1930-04-23 1933-05-09 0 Details
US1905247A Welding electrode Expired / Lapsed 1931-04-08 1933-04-25 0 Details
US1902958A Circuit breaker Expired / Lapsed 1929-08-14 1933-03-28 0 Details
US1902650A Remote control system for oscillographs Expired / Lapsed 1928-09-13 1933-03-21 0 Details
US1901663A Control system Expired / Lapsed 1931-04-17 1933-03-14 0 Details
US1901570A Smoke indicator Expired / Lapsed 1928-11-09 1933-03-14 0 Details
US1894267A Ash handling apparatus Expired / Lapsed 1928-02-02 1933-01-17 0 Details
US1888718A Relaying system Expired / Lapsed 1929-08-30 1932-11-22 0 Details
US1888721A Control system Expired / Lapsed 1929-04-11 1932-11-22 0 Details
US1877561A Transmitting circuit Expired / Lapsed 1928-09-13 1932-09-13 0 Details
US1873016A Motion-picture apparatus Expired / Lapsed 1931-02-02 1932-08-23 0 Details
US1872243A Electrical indicating, measuring, relay and like arrangemen… Expired / Lapsed 1929-11-13 1932-08-16 0 Details
US1871710A Metering system Expired / Lapsed 1929-04-11 1932-08-16 0 Details
US1872372A Advertising device Expired / Lapsed 1929-01-23 1932-08-16 0 Details
US1871750A Speed regulating system Expired / Lapsed 1928-01-25 1932-08-16 0 Details
US1872370A Demand totalizer Expired / Lapsed 1927-12-24 1932-08-16 0 Details
US1872155A Control mechanism Expired / Lapsed 1927-11-02 1932-08-16 0 Details
US1871748A Switchboard indicating lamp Expired / Lapsed 1927-06-11 1932-08-16 0 Details
US1872122A Electric switch Expired / Lapsed 1922-12-04 1932-08-16 0 Details
US1871372A Garage elevator Expired / Lapsed 1929-09-18 1932-08-09 0 Details
US1871371A Solder joint structure Expired / Lapsed 1929-07-16 1932-08-09 0 Details
US1871380A High-speed recorder Expired / Lapsed 1929-05-13 1932-08-09 0 Details
US1870778A Sound recording method Expired / Lapsed 1928-11-20 1932-08-09 0 Details
US1870181A Protective system Expired / Lapsed 1926-04-23 1932-08-02 0 Details
US1866679A Direct current supply system Expired / Lapsed 1926-03-31 1932-07-12 0 Details
US1865937A Light cell control Expired / Lapsed 1928-07-11 1932-07-05 0 Details
US1864127A Governing mechanism Expired / Lapsed 1929-10-04 1932-06-21 0 Details
US1863302A Regulator system Expired / Lapsed 1930-09-22 1932-06-14 0 Details
US1863363A View transmission system Expired / Lapsed 1929-11-01 1932-06-14 0 Details
US1861462A Radio station Expired / Lapsed 1928-05-03 1932-06-07 0 Details
US1862119A Automatic direction finder Expired / Lapsed 1926-09-02 1932-06-07 0 Details
US1851699A Space-current discharge device Expired / Lapsed 1923-12-21 1932-03-29 0 Details
US1849488A Multiplex transmission Expired / Lapsed 1928-03-27 1932-03-15 0 Details
US1842212A Rectifier Expired / Lapsed 1928-09-13 1932-01-19 0 Details
US1839608A Recording volt-ampere-meter Expired / Lapsed 1929-04-11 1932-01-05 0 Details
US1835470A Transformer cooling system Expired / Lapsed 1928-08-30 1931-12-08 0 Details
US1830578A Temperature control system Expired / Lapsed 1928-12-14 1931-11-03 0 Details
US1828328A Photographic device Expired / Lapsed 1922-01-25 1931-10-20 0 Details
US1822075A Electrical measuring instrument Expired / Lapsed 1929-04-03 1931-09-08 0 Details
US1819513A Garage elevator Expired / Lapsed 1928-03-27 1931-08-18 0 Details
US1818177A Junction box Expired / Lapsed 1928-08-30 1931-08-11 0 Details
US1815045A Radio signaling system Expired / Lapsed 1928-07-30 1931-07-21 0 Details
US1813181A High-speed circuit interrupter Expired / Lapsed 1926-06-07 1931-07-07 0 Details
US1810739A Smoke indicator system Expired / Lapsed 1928-11-09 1931-06-16 0 Details
US1809280A Safety system Expired / Lapsed 1928-05-26 1931-06-09 0 Details
US1807852A Shunt Expired / Lapsed 1929-05-03 1931-06-02 0 Details
US1807056A Light sensitive element Expired / Lapsed 1928-11-06 1931-05-26 0 Details
US1799991A Refrigerating apparatus Expired / Lapsed 1929-05-13 1931-04-07 0 Details
US1794998A Transmission-line support support Expired / Lapsed 1925-12-08 1931-03-03 0 Details
US1795000A Supervisory and control system Expired / Lapsed 1925-03-26 1931-03-03 0 Details
US1792320A High-frequency testing apparatus Expired / Lapsed 1926-01-02 1931-02-10 0 Details
US1790188A Supervisory control system Expired / Lapsed 1925-12-17 1931-01-27 0 Details
US1788111A Street-lighting system Expired / Lapsed 1928-08-22 1931-01-06 0 Details
US1786812A Facsimile-transmission system Expired / Lapsed 1929-03-26 1930-12-30 0 Details
US1786824A Process of drying varnish films Expired / Lapsed 1928-01-16 1930-12-30 0 Details
US1778834A Device for detecting oxygen in hydrogen Expired / Lapsed 1926-04-30 1930-10-21 0 Details
US1751225A Regulator system Expired / Lapsed 1927-12-09 1930-03-18 0 Details
US1750242A Remote-metering system Expired / Lapsed 1926-04-30 1930-03-11 0 Details
US1749553A Supervisory control system Expired / Lapsed 1923-08-06 1930-03-04 0 Details
US1748364A Method of making turbine blades Expired / Lapsed 1928-10-09 1930-02-25 0 Details
US1746756A Regulator system Expired / Lapsed 1927-12-09 1930-02-11 0 Details
US1746661A Method of and apparatus for controlling vibratory systems Expired / Lapsed 1927-04-11 1930-02-11 0 Details
US1745868A Electrical measuring instrument Expired / Lapsed 1927-10-01 1930-02-04 0 Details
US1745072A Supervisory control system Expired / Lapsed 1923-11-28 1930-01-28 0 Details
US1743175A Traffic supervisor Expired / Lapsed 1926-07-03 1930-01-14 0 Details
US1740556A Supervisory control system Expired / Lapsed 1924-06-06 1929-12-24 0 Details
US1735153A Door-operating device for elevators Expired / Lapsed 1927-06-10 1929-11-12 0 Details
US1735225A Thermal relay Expired / Lapsed 1926-08-07 1929-11-12 0 Details
US1732874A Photographic sound recording Expired / Lapsed 1927-05-26 1929-10-22 0 Details
US1732722A Directive-reception microphone Expired / Lapsed 1924-01-02 1929-10-22 0 Details
US1732711A Control system Expired / Lapsed 1920-05-04 1929-10-22 0 Details
US1730861A Method and means for operating electric motors Expired / Lapsed 1926-04-28 1929-10-08 0 Details
US1730283A Control system Expired / Lapsed 1927-09-19 1929-10-01 0 Details
US1728745A Electric relay apparatus employing thermionic valves Expired / Lapsed 1924-11-08 1929-09-17 0 Details
US1725161A Meter attachment Expired / Lapsed 1924-06-13 1929-08-20 0 Details
US1725134A Supervisory control system Expired / Lapsed 1923-09-20 1929-08-20 0 Details
US1715750A Control system Expired / Lapsed 1927-08-13 1929-06-04 0 Details
US1716155A Vacuum-responsive glow-tube control for rectifiers Expired / Lapsed 1927-08-06 1929-06-04 0 Details
US1714969A Supervisory control system Expired / Lapsed 1924-03-17 1929-05-28 0 Details
US1714722A Electrical distribution system Expired / Lapsed 1924-01-16 1929-05-28 0 Details
US1710755A Generator-voltage regulator Expired / Lapsed 1927-12-09 1929-04-30 0 Details
US1709762A Interferometer microphone Expired / Lapsed 1926-10-07 1929-04-16 0 Details
US1709031A Supervisory control system Expired / Lapsed 1924-05-22 1929-04-16 0 Details
US1699779A Process for improving tensile strength of fabric materials Expired / Lapsed 1927-07-15 1929-01-22 0 Details
US1697166A Maximum demand meter Expired / Lapsed 1924-01-05 1929-01-01 0 Details
US1693369A Heat-responsive material Expired / Lapsed 1927-04-21 1928-11-27 0 Details
US1691324A Television system Expired / Lapsed 1925-07-13 1928-11-13 0 Details
US1691360A Control system Expired / Lapsed 1924-06-06 1928-11-13 0 Details
US1687652A Electric heating system for cars Expired / Lapsed 1927-08-09 1928-10-16 0 Details
US1686638A Slip indicator Expired / Lapsed 1921-03-24 1928-10-09 0 Details
US1680737A Elastic-fluid turbine Expired / Lapsed 1924-12-27 1928-08-14 0 Details
US1673591A Temperature indicator and controller Expired / Lapsed 1922-04-13 1928-06-12 0 Details
US1669493A Circuit breaker Expired / Lapsed 1923-10-15 1928-05-15 0 Details
US1666473A High-voltage direct-current system Expired / Lapsed 1921-02-26 1928-04-17 0 Details
US1665936A Radiodetector Expired / Lapsed 1923-10-15 1928-04-10 0 Details
US1635541A Inductance device Expired / Lapsed 1925-07-24 1927-07-12 0 Details
US1626663A Temperature-controlling system Expired / Lapsed 1923-02-08 1927-05-03 0 Details
US1626660A Switchboard Expired / Lapsed 1921-02-26 1927-05-03 0 Details
US1614222A Metering system Expired / Lapsed 1924-11-15 1927-01-11 0 Details
US1612351A Water-wheel regulator Expired / Lapsed 1924-11-26 1926-12-28 0 Details
US1610552A Relay Expired / Lapsed 1919-12-22 1926-12-14 0 Details
US1602882A Measuring instrument Expired / Lapsed 1922-09-23 1926-10-12 0 Details
US1599574A Blast-furnace bell hoist Expired / Lapsed 1924-10-04 1926-09-14 0 Details
US1599922A Balancing machine Expired / Lapsed 1924-09-12 1926-09-14 0 Details
US1599541A Echo-box microphone Expired / Lapsed 1924-04-02 1926-09-14 0 Details
US1592376A Thermostat Expired / Lapsed 1921-07-19 1926-07-13 0 Details
US1590420A Comparator Expired / Lapsed 1921-01-14 1926-06-29 0 Details
US1588556A Expansion connecter Expired / Lapsed 1921-03-14 1926-06-15 0 Details
US1575010A Limit switch Expired / Lapsed 1922-04-29 1926-03-02 0 Details
US1571304A Electrical system Expired / Lapsed 1923-02-28 1926-02-02 0 Details
US1571292A Electrical switch for car doors Expired / Lapsed 1921-09-23 1926-02-02 0 Details
US1565519A Apparatus for magnetic spring testing Expired / Lapsed 1921-04-21 1925-12-15 0 Details
US1565416A Electron-tube oscillator Expired / Lapsed 1921-02-14 1925-12-15 0 Details
US1563382A Graphic recording device Expired / Lapsed 1923-01-05 1925-12-01 0 Details
US1561265A Speed-regulator system Expired / Lapsed 1920-01-12 1925-11-10 0 Details
US1553407A Speed-regulator system Expired / Lapsed 1919-11-06 1925-09-15 0 Details
US1539837A Transformer cooling system Expired / Lapsed 1919-08-15 1925-06-02 0 Details
US1528053A Temperature-control system Expired / Lapsed 1922-07-11 1925-03-03 0 Details
US1526319A Piezo-electric loud speaker Expired / Lapsed 1924-01-08 1925-02-17 0 Details
US1508237A Control apparatus and system Expired / Lapsed 1921-10-07 1924-09-09 0 Details
US1501330A Electrical contact element Expired / Lapsed 1919-05-12 1924-07-15 0 Details
US1497415A Molded oil-filled condenser Expired / Lapsed 1921-04-21 1924-06-10 0 Details
US1494401A Motor-control system Expired / Lapsed 1921-09-23 1924-05-20 0 Details
US1481919A Electric power system Expired / Lapsed 1920-05-17 1924-01-29 0 Details
US1469219A Motor-control system Expired / Lapsed 1921-08-18 1923-10-02 0 Details
US1467777A Condenser and method of making the same Expired / Lapsed 1919-02-15 1923-09-11 0 Details
US1463168A System of control Expired / Lapsed 1920-10-27 1923-07-31 0 Details
US1458931A Method of forming annular bodies Expired / Lapsed 1918-11-04 1923-06-19 0 Details
US1448401A Fluid-pressure regulator Expired / Lapsed 1920-09-24 1923-03-13 0 Details
US1448409A Frequency-regulator system Expired / Lapsed 1920-03-31 1923-03-13 0 Details
US1448402A Measuring system Expired / Lapsed 1916-06-05 1923-03-13 0 Details
US1440470A Method and apparatus for testing welds Expired / Lapsed 1921-04-21 1923-01-02 0 Details
US1440224A Governing mechanism Expired / Lapsed 1919-08-08 1922-12-26 0 Details
US1437142A Regulator system Expired / Lapsed 1920-01-16 1922-11-28 0 Details
US1435255A Change-over switch Expired / Lapsed 1919-07-05 1922-11-14 0 Details
US1421170A Circuit interrupter Expired / Lapsed 1918-01-14 1922-06-27 0 Details
US1412514A Electrolyte Expired / Lapsed 1917-02-19 1922-04-11 0 Details
US1406234A Circuit interrupter Expired / Lapsed 1918-11-04 1922-02-14 0 Details
US1406377A Motor-control system Expired / Lapsed 1917-11-07 1922-02-14 0 Details
US1406235A Electrical measuring instrument Expired / Lapsed 1916-08-30 1922-02-14 0 Details
US1401654A Measuring system Expired / Lapsed 1918-07-10 1921-12-27 0 Details
US1400055A Shaft-bearing Expired / Lapsed 1917-12-13 1921-12-13 0 Details
US1399769A Soldering-strip Expired / Lapsed 1917-11-24 1921-12-13 0 Details
US1396919A Automatic operation of electrolytic cells Expired / Lapsed 1919-11-20 1921-11-15 0 Details
US1396871A Expanded-metal resistor and method of making the same Expired / Lapsed 1919-03-07 1921-11-15 0 Details
US1392160A Control apparatus Expired / Lapsed 1917-07-06 1921-09-27 0 Details
US1390596A Terminal structure and method of making the same Expired / Lapsed 1918-03-13 1921-09-13 0 Details
US1384491A Connector Expired / Lapsed 1917-06-13 1921-07-12 0 Details
US1376411A Automatic pumping system Expired / Lapsed 1917-07-12 1921-05-03 0 Details
US1374534A Circuit-interrupting device Expired / Lapsed 1917-01-06 1921-04-12 0 Details
US1370024A Molded article and method of making the same Expired / Lapsed 1918-10-08 1921-03-01 0 Details
US1361801A Lightning-arrester Expired / Lapsed 1917-09-01 1920-12-14 0 Details
US1357257A Switching device Expired / Lapsed 1918-09-16 1920-11-02 0 Details
US1348943A Electrical system Expired / Lapsed 1916-10-14 1920-08-10 0 Details
US1327777A Circuit-interrupter Expired / Lapsed 1917-11-19 1920-01-13 0 Details
US1302028A Sheet-handling implement. Expired / Lapsed 1914-07-13 1919-04-29 0 Details
US1300236A Reduction-gearing for electric motors. Expired / Lapsed 1917-05-15 1919-04-15 0 Details
US1299747A Wood veneer. Expired / Lapsed 1918-03-13 1919-04-08 0 Details
US1299252A Measuring device. Expired / Lapsed 1918-04-04 1919-04-01 0 Details
US1298728A Electrical system. Expired / Lapsed 1916-02-03 1919-04-01 0 Details
US1298757A Dynamo-electric machine. Expired / Lapsed 1915-03-24 1919-04-01 0 Details
US1298664A Vacuum-pump. Expired / Lapsed 1915-01-18 1919-04-01 0 Details
US1291233A Control system. Expired / Lapsed 1915-10-27 1919-01-14 0 Details
US1289116A Thermo-couple and method of constructing the same. Expired / Lapsed 1914-02-19 1918-12-31 0 Details
US1286283A Method of shrouding blades. Expired / Lapsed 1914-12-30 1918-12-03 0 Details
US1284296A Process of making laminated articles. Expired / Lapsed 1918-10-02 1918-11-12 0 Details
US1283211A Control system. Expired / Lapsed 1915-12-02 1918-10-29 0 Details
US1274635A Measuring device. Expired / Lapsed 1915-09-10 1918-08-06 0 Details
US1275003A Dynamo-electric machine. Expired / Lapsed 1915-08-09 1918-08-06 0 Details
US1272700A Metallic joint and process of making the same. Expired / Lapsed 1914-10-02 1918-07-16 0 Details
US1267983A Dynamo-electric machine. Expired / Lapsed 1914-02-19 1918-05-28 0 Details
US1266570A Measuring device. Expired / Lapsed 1916-07-03 1918-05-21 0 Details
US1253207A Electrical protective device. Expired / Lapsed 1913-12-19 1918-01-15 0 Details
US1252060A Electrical regulator. Expired / Lapsed 1911-10-05 1918-01-01 0 Details
US1241510A Controller. Expired / Lapsed 1914-09-10 1917-10-02 0 Details
US1241559A Commutator. Expired / Lapsed 1913-12-31 1917-10-02 0 Details
US1238292A Ventilating construction for dynamo-electric machines. Expired / Lapsed 1915-08-06 1917-08-28 0 Details
US1227810A Motor-control system. Expired / Lapsed 1915-04-12 1917-05-29 0 Details
US1227292A Bed-plate. Expired / Lapsed 1913-08-02 1917-05-22 0 Details
US1210030A Blower system. Expired / Lapsed — 1916-12-26 0 Details
US1210049A Electrical protective device. Expired / Lapsed 1915-12-14 1916-12-26 0 Details
US1186815A Protective device for electrical apparatus. Expired / Lapsed 1912-07-17 1916-06-13 0 Details
US1186770A Circuit-interrupter. Expired / Lapsed 1911-12-26 1916-06-13 0 Details
US1184844A Electric-circuit interrupter. Expired / Lapsed 1912-05-27 1916-05-30 0 Details
US1164032A Electrical measuring instrument. Expired / Lapsed 1913-12-04 1915-12-14 0 Details
US1158487A Resistance element. Expired / Lapsed 1910-06-25 1915-11-02 0 Details
US1155170A System and method of control for electric motors. Expired / Lapsed 1912-10-05 1915-09-28 0 Details
US1155157A Reversing-switch. Expired / Lapsed 1911-05-22 1915-09-28 0 Details
US1007441A Electric heater and process of constructing the same. Expired / Lapsed 1909-03-15 1911-10-31 0 Details
US974328A Fluid-pressure-controlled switching device. Expired / Lapsed 1907-12-06 1910-11-01 0 Details
US936669A Electrical coil. Expired / Lapsed 1907-11-18 1909-10-12 0 Details
US765203A Alternating-current electrical apparatus. Expired / Lapsed 1902-09-13 1904-07-19 0 Details
US680797A Electromagnetic motor or reciprocating engine. Expired / Lapsed 1899-11-02 1901-08-20 0 Details