Raytheon Co
Raytheon CActive Patents
1
Total Holdings
432
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| WO1982002604A1 | Miniature window for optical fiber | Expired / Lapsed | 1982-01-15 | — | 0 | Details |
| GB1462913A | Dual spectrum infrared fire detection system with high ener… | Expired / Lapsed | 1974-06-12 | — | 0 | Details |
| GB1388233A | Digital scan converter | Expired / Lapsed | 1973-05-21 | — | 0 | Details |
| GB966455A | Devices for producing coherent electromagnetic radiation | Expired / Lapsed | 1963-03-13 | — | 0 | Details |
| US10000000B2 | Coherent LADAR using intra-pixel quadrature detection | Active / In Force | 2015-03-10 | 2018-06-19 | 23 | Details |
| US5545897A | Optically-based chemical detection system | Expired / Lapsed | 1994-10-04 | 1996-08-13 | 53 | Details |
| US5327149A | R.F. transparent RF/UV-IR detector apparatus | Expired / Lapsed | 1992-05-18 | 1994-07-05 | 36 | Details |
| US5317689A | Digital visual and sensor simulation system for generating … | Expired / Lapsed | 1990-08-10 | 1994-05-31 | 26 | Details |
| US5093563A | Electronically phased detector arrays for optical imaging | Expired / Lapsed | 1989-03-03 | 1992-03-03 | 83 | Details |
| US5068086A | Method and apparatus for batch fixating tissue specimens | Expired / Lapsed | 1990-06-12 | 1991-11-26 | 17 | Details |
| US5027122A | Method and apparatus for doppler velocity de-aliasing | Expired / Lapsed | 1990-03-12 | 1991-06-25 | 45 | Details |
| US4934779A | System and method for low noise optical retroreflection wit… | Expired / Lapsed | 1989-04-24 | 1990-06-19 | 13 | Details |
| US4906092A | Range doppler self-referencing imaging system | Expired / Lapsed | 1988-09-19 | 1990-03-06 | 27 | Details |
| US4891239A | Method and apparatus for ultrafast microwave tissue fixation | Expired / Lapsed | 1989-04-13 | 1990-01-02 | 43 | Details |
| US4846571A | AM-FM laser | Expired / Lapsed | 1986-11-03 | 1989-07-11 | 11 | Details |
| US4814785A | Wideband gridded square frequency selective surface | Expired / Lapsed | 1988-01-25 | 1989-03-21 | 2 | Details |
| US4783744A | Self-adaptive IRU correction loop design interfacing with t… | Expired / Lapsed | 1986-12-08 | 1988-11-08 | 13 | Details |
| US4743919A | Microwave frequency selective surface having fibrous cerami… | Expired / Lapsed | 1986-10-07 | 1988-05-10 | 19 | Details |
| US4739496A | Associative holographic memory apparatus employing phase co… | Expired / Lapsed | 1985-10-11 | 1988-04-19 | 18 | Details |
| US4721385A | FM-CW laser radar system | Expired / Lapsed | 1986-12-09 | 1988-01-26 | 24 | Details |
| US4700307A | Feature navigation system and method | Expired / Lapsed | 1983-07-11 | 1987-10-13 | 30 | Details |
| US4698638A | Dual mode target seeking system | Expired / Lapsed | 1985-12-26 | 1987-10-06 | 19 | Details |
| US4680044A | Method of modifying the refractive index of fluoride glass | Expired / Lapsed | 1985-11-25 | 1987-07-14 | 11 | Details |
| US4669054A | Device and method for optically correlating a pair of images | Expired / Lapsed | 1985-05-03 | 1987-05-26 | 14 | Details |
| US4666295A | Linear FM chirp laser | Expired / Lapsed | 1984-07-03 | 1987-05-19 | 32 | Details |
| US4530564A | Method and apparatus for production of holographic optical … | Expired / Lapsed | 1980-08-18 | 1985-07-23 | 16 | Details |
| US4490723A | Parallel plate lens antenna | Expired / Lapsed | 1983-01-03 | 1984-12-25 | 8 | Details |
| US4484335A | Method and apparatus for despreading a spread spectrum sign… | Expired / Lapsed | 1982-10-14 | 1984-11-20 | 12 | Details |
| US4469944A | Optical discriminating fire sensor | Expired / Lapsed | 1981-11-20 | 1984-09-04 | 50 | Details |
| US4451905A | Electrically erasable programmable read-only memory cell ha… | Expired / Lapsed | 1981-12-28 | 1984-05-29 | 24 | Details |
| US4387374A | Range mark position control employing optical encoding | Expired / Lapsed | 1980-08-04 | 1983-06-07 | 17 | Details |
| US4384338A | Methods and apparatus for blending computer image generated… | Expired / Lapsed | 1980-12-24 | 1983-05-17 | 10 | Details |
| US4339751A | Marine radar including anticollision unit | Expired / Lapsed | 1980-08-27 | 1982-07-13 | 7 | Details |
| US4311384A | Laser scanning system | Expired / Lapsed | 1975-08-04 | 1982-01-19 | 29 | Details |
| US4305401A | Digital watch/infrared plethysmograph having a quick releas… | Expired / Lapsed | 1979-05-16 | 1981-12-15 | 12 | Details |
| US4283767A | Multiple correlator reference processor | Expired / Lapsed | 1979-05-03 | 1981-08-11 | 9 | Details |
| US4242962A | Antitank weapon system and elements therefor | Expired / Lapsed | 1979-01-02 | 1981-01-06 | 3 | Details |
| US4234888A | Multi-level large scale complex integrated circuit having f… | Expired / Lapsed | 1973-07-26 | 1980-11-18 | 26 | Details |
| US4220967A | Scene tracker using multiple independent correlators | Expired / Lapsed | 1976-09-27 | 1980-09-02 | 12 | Details |
| US4218111A | Holographic head-up displays | Expired / Lapsed | 1978-07-10 | 1980-08-19 | 2 | Details |
| US4208810A | Clipping polygon faces through a polyhedron of vision | Expired / Lapsed | 1978-09-11 | 1980-06-24 | 19 | Details |
| US4205313A | Marine radar including anticollision unit | Expired / Lapsed | 1978-04-25 | 1980-05-27 | 21 | Details |
| US4189747A | Infrared tracking system | Expired / Lapsed | 1967-09-15 | 1980-02-19 | 21 | Details |
| US4181405A | Head-up viewing display | Expired / Lapsed | 1978-08-07 | 1980-01-01 | 18 | Details |
| US4181953A | Face vertex correction for real-time simulation of a polygo… | Expired / Lapsed | 1978-02-17 | 1980-01-01 | 10 | Details |
| US4179824A | Simulation of an object system formed by polygon faces havi… | Expired / Lapsed | 1978-05-04 | 1979-12-25 | 17 | Details |
| US4174541A | Bipolar monolithic integrated circuit memory with standby p… | Expired / Lapsed | 1978-05-25 | 1979-11-13 | 21 | Details |
| US4170997A | Medical laser instrument for transmitting infrared laser en… | Expired / Lapsed | 1977-08-26 | 1979-10-16 | 11 | Details |
| US4168489A | Full page mode system for certain word processing devices | Expired / Lapsed | 1978-02-13 | 1979-09-18 | 7 | Details |
| US4144571A | Vehicle guidance system | Expired / Lapsed | 1977-03-15 | 1979-03-13 | 18 | Details |
| US4115914A | Electrically erasable non-volatile semiconductor memory | Expired / Lapsed | 1977-02-22 | 1978-09-26 | 16 | Details |
| US4102572A | Dual-wavelength coherent optical adaptive systems | Expired / Lapsed | 1977-08-11 | 1978-07-25 | 19 | Details |
| US4090066A | Polarization reference imaging system | Expired / Lapsed | 1976-04-22 | 1978-05-16 | 8 | Details |
| US4077037A | Variable range marker | Expired / Lapsed | 1976-08-06 | 1978-02-28 | 11 | Details |
| US4063084A | Dual channel optical homodyne receiver | Expired / Lapsed | 1976-07-19 | 1977-12-13 | 13 | Details |
| US4054366A | Fiber optics access coupler | Expired / Lapsed | 1976-07-12 | 1977-10-18 | 8 | Details |
| US4054880A | Position fixing system utilizing plural commercial broadcas… | Expired / Lapsed | 1976-01-19 | 1977-10-18 | 16 | Details |
| US4044247A | Polarization reference imaging technique | Expired / Lapsed | 1975-12-16 | 1977-08-23 | 31 | Details |
| US4042935A | Wideband multiplexing antenna feed employing cavity backed … | Expired / Lapsed | 1975-10-08 | 1977-08-16 | 15 | Details |
| US4030686A | Position determining systems | Expired / Lapsed | 1975-09-04 | 1977-06-21 | 11 | Details |
| US4005935A | Method and apparatus for providing a phase compensated opti… | Expired / Lapsed | 1975-07-31 | 1977-02-01 | 17 | Details |
| US4005417A | Frequency spectrum analyzer | Expired / Lapsed | 1975-08-14 | 1977-01-25 | 13 | Details |
| US3996421A | Television display utilizing local area brightness control | Expired / Lapsed | 1975-09-02 | 1976-12-07 | 12 | Details |
| US3975628A | Optical heterodyne receiver with phase or frequency lock | Expired / Lapsed | 1975-04-02 | 1976-08-17 | 13 | Details |
| US3970993A | Cooperative-word linear array parallel processor | Expired / Lapsed | 1974-01-02 | 1976-07-20 | 22 | Details |
| US3952297A | Constant writing rate digital stroke character generator ha… | Expired / Lapsed | 1974-08-01 | 1976-04-20 | 25 | Details |
| US3952304A | Tracking system utilizing Kalman filter concepts | Expired / Lapsed | 1973-11-23 | 1976-04-20 | 10 | Details |
| US3950750A | Radar system having quadrature phase detector compensator | Expired / Lapsed | 1974-10-03 | 1976-04-13 | 6 | Details |
| US3950611A | Gated video centroid tracker | Expired / Lapsed | 1966-11-22 | 1976-04-13 | 19 | Details |
| US3949263A | Diamond brazing method for slow wave energy propagating str… | Expired / Lapsed | 1974-12-20 | 1976-04-06 | 8 | Details |
| US3947834A | Doppler perimeter intrusion alarm system using a leaky wave… | Expired / Lapsed | 1974-04-30 | 1976-03-30 | 32 | Details |
| US3924259A | Array of multicellular transducers | Expired / Lapsed | 1974-05-15 | 1975-12-02 | 15 | Details |
| US3921166A | Capacitance matrix keyboard | Expired / Lapsed | 1972-09-15 | 1975-11-18 | 15 | Details |
| US3909798A | Virtual addressing method and apparatus | Expired / Lapsed | 1974-01-25 | 1975-09-30 | 4 | Details |
| US3903488A | Planar dielectric waveguide and associated components for i… | Expired / Lapsed | 1974-06-10 | 1975-09-02 | 11 | Details |
| US3883870A | System for phase aligning parallel signal processing channe… | Expired / Lapsed | 1973-12-17 | 1975-05-13 | 6 | Details |
| US3878530A | Radar video processing apparatus | Expired / Lapsed | 1965-03-15 | 1975-04-15 | 9 | Details |
| US3872446A | Visual display system | Expired / Lapsed | 1973-05-07 | 1975-03-18 | 11 | Details |
| US3858208A | Automatic prf selection to optimize range and doppler visib… | Expired / Lapsed | 1973-02-05 | 1974-12-31 | 14 | Details |
| US3828204A | Sensitive pulse threshold detector | Expired / Lapsed | 1973-04-16 | 1974-08-06 | 32 | Details |
| US3821646A | Scatter communication system | Expired / Lapsed | 1972-02-25 | 1974-06-28 | 4 | Details |
| US3818237A | Means for providing redundancy of key system components | Expired / Lapsed | 1972-08-14 | 1974-06-18 | 2 | Details |
| US3816804A | Bilateral power conditioner for spacecraft | Expired / Lapsed | 1973-05-29 | 1974-06-11 | 13 | Details |
| US3810174A | Digital scan converter | Expired / Lapsed | 1969-11-28 | 1974-05-07 | 38 | Details |
| US3806814A | Phantom subscriber | Expired / Lapsed | 1972-04-26 | 1974-04-23 | 22 | Details |
| US3794993A | Coordinate generation system | Expired / Lapsed | 1972-06-22 | 1974-02-26 | 29 | Details |
| US3790700A | Catv program control system | Expired / Lapsed | 1971-12-17 | 1974-02-05 | 45 | Details |
| US3786429A | Electronic text display system which simulates a typewriter | Expired / Lapsed | 1971-07-12 | 1974-01-15 | 7 | Details |
| US3764213A | Return-wave, phase controlled adaptive array | Expired / Lapsed | 1972-05-08 | 1973-10-09 | 22 | Details |
| US3761675A | Material cutting and printing system | Expired / Lapsed | 1972-01-19 | 1973-09-25 | 21 | Details |
| US3760360A | Matrix switch | Expired / Lapsed | 1971-11-01 | 1973-09-18 | 11 | Details |
| US3758753A | Optical code reader system | Expired / Lapsed | 1971-07-16 | 1973-09-11 | 8 | Details |
| US3745533A | Digital data storage register modules | Expired / Lapsed | 1970-05-27 | 1973-07-10 | 5 | Details |
| US3745532A | Modular digital processing equipment | Expired / Lapsed | 1970-05-27 | 1973-07-10 | 19 | Details |
| US3736376A | Automatic control system for video tracker | Expired / Lapsed | 1967-03-30 | 1973-05-29 | 15 | Details |
| US3735237A | Cycle converter power supply for microwave heating | Expired / Lapsed | 1971-09-01 | 1973-05-22 | 29 | Details |
| US3733129A | Laser distance detector | Expired / Lapsed | 1971-02-01 | 1973-05-15 | 17 | Details |
| US3731103A | Adaptive arrays | Expired / Lapsed | 1971-02-24 | 1973-05-01 | 9 | Details |
| US3725915A | High resolution mapping system | Expired / Lapsed | 1960-12-27 | 1973-04-03 | 32 | Details |
| US3716825A | Contour measuring apparatus especially for use in a sea bot… | Expired / Lapsed | 1970-07-30 | 1973-02-13 | 13 | Details |
| US3716783A | Sequential check-out system including code comparison for c… | Expired / Lapsed | 1969-10-30 | 1973-02-13 | 0 | Details |
| US3714706A | Array of conductors fixed through dielectric plate | Expired / Lapsed | 1970-08-21 | 1973-02-06 | 0 | Details |
| US3714434A | Despin control system for a multispin stabilized device | Expired / Lapsed | 1971-01-29 | 1973-01-30 | 14 | Details |
| US3694656A | Balanced optical demodulator | Expired / Lapsed | 1970-10-28 | 1972-09-26 | 2 | Details |
| US3669540A | Optical depth finder and elements therefor | Expired / Lapsed | 1970-08-31 | 1972-06-13 | 0 | Details |
| US3665282A | Scan control system | Expired / Lapsed | 1969-07-24 | 1972-05-23 | 15 | Details |
| US3654473A | Phase modulation laser communication system | Expired / Lapsed | 1969-04-28 | 1972-04-04 | 5 | Details |
| US3646580A | Surface vehicle fleet command and control system | Expired / Lapsed | 1969-07-18 | 1972-02-29 | 9 | Details |
| US3644043A | Integrated infrared-tracker-receiver laser-rangefinder targ… | Expired / Lapsed | 1969-08-11 | 1972-02-22 | 11 | Details |
| US3643106A | Analog shift register | Expired / Lapsed | 1970-09-14 | 1972-02-15 | 11 | Details |
| US3641266A | Surveillance and intrusion detecting system | Expired / Lapsed | 1969-12-29 | 1972-02-08 | 19 | Details |
| US3639838A | Synchronized variable delay time division communication sys… | Expired / Lapsed | 1968-01-30 | 1972-02-01 | 8 | Details |
| US3633169A | Demand access digital-communications system | Expired / Lapsed | 1970-05-28 | 1972-01-04 | 38 | Details |
| US3633173A | Digital scan converter | Expired / Lapsed | 1970-03-16 | 1972-01-04 | 7 | Details |
| US3631315A | Broadband traveling wave device having a logarithmically va… | Expired / Lapsed | 1969-10-20 | 1971-12-28 | 20 | Details |
| US3623096A | Deflection modulated target discriminator | Expired / Lapsed | 1967-02-15 | 1971-11-23 | 9 | Details |
| US3615934A | Insulated-gate field-effect device having source and drain … | Expired / Lapsed | 1967-10-30 | 1971-10-26 | 2 | Details |
| US3599105A | Amplitude discriminator with an adaptive threshold | Expired / Lapsed | 1969-07-24 | 1971-08-10 | 11 | Details |
| US3594551A | High speed digital counter | Expired / Lapsed | 1966-11-29 | 1971-07-20 | 9 | Details |
| US3593032A | Mosfet static shift register | Expired / Lapsed | 1969-12-15 | 1971-07-13 | 4 | Details |
| US3584312A | Spikeless single-mode laser | Expired / Lapsed | 1969-10-20 | 1971-06-08 | 8 | Details |
| US3579201A | Method of performing digital computations using multipurpos… | Expired / Lapsed | 1969-09-29 | 1971-05-18 | 8 | Details |
| US3573833A | Broadband dielectric lens antenna fed by multiconductor qua… | Expired / Lapsed | 1969-07-22 | 1971-04-06 | 13 | Details |
| US3561839A | High-speed hologram | Expired / Lapsed | 1969-10-06 | 1971-02-09 | 0 | Details |
| US3562022A | Method of doping semiconductor bodies by indirection implan… | Expired / Lapsed | 1967-12-26 | 1971-02-09 | 0 | Details |
| US3560077A | Variable transmission passive q-switch | Expired / Lapsed | 1968-02-19 | 1971-02-02 | 0 | Details |
| US3551826A | Frequency multiplier and frequency waveform generator | Expired / Lapsed | 1968-05-16 | 1970-12-29 | 0 | Details |
| US3546695A | Radar transpondor system | Expired / Lapsed | 1969-03-03 | 1970-12-08 | 0 | Details |
| US3545861A | Selective target ranging system | Expired / Lapsed | 1966-04-08 | 1970-12-08 | 0 | Details |
| US3546375A | Three-dimensional terrain mapping system | Expired / Lapsed | 1965-09-20 | 1970-12-08 | 0 | Details |
| US3544399A | Insulated gate field-effect transistor (igfet) with semicon… | Expired / Lapsed | 1966-10-26 | 1970-12-01 | 0 | Details |
| US3535447A | Inductively coupled telautograph apparatus with stylus angl… | Expired / Lapsed | 1967-11-06 | 1970-10-20 | 0 | Details |
| US3531282A | Photopolymer polymerization fixation process and products | Expired / Lapsed | 1966-10-03 | 1970-09-29 | 0 | Details |
| US3523042A | Method of making bipolar transistor devices | Expired / Lapsed | 1967-12-26 | 1970-08-04 | 0 | Details |
| US3522604A | Coherent-angle tracking system | Expired / Lapsed | 1955-12-09 | 1970-08-04 | 1 | Details |
| US3520741A | Method of simultaneous epitaxial growth and ion implantation | Expired / Lapsed | 1967-12-18 | 1970-07-14 | 0 | Details |
| US3513264A | Controlled random multiple access communication system | Expired / Lapsed | 1966-05-13 | 1970-05-19 | 0 | Details |
| US3504165A | Navigation station identification | Expired / Lapsed | 1967-03-27 | 1970-03-31 | 0 | Details |
| US3500022A | Reversible electronic digital counter | Expired / Lapsed | 1966-06-24 | 1970-03-10 | 0 | Details |
| US3497695A | Radiant energy transmitting device | Expired / Lapsed | 1961-12-11 | 1970-02-24 | 2 | Details |
| US3488483A | Constant writing rate vector generator | Expired / Lapsed | 1967-06-30 | 1970-01-06 | 0 | Details |
| US3486892A | Preferential etching technique | Expired / Lapsed | 1969-01-17 | 1969-12-30 | 0 | Details |
| US3472712A | Field-effect device with insulated gate | Expired / Lapsed | 1966-10-27 | 1969-10-14 | 0 | Details |
| US3471922A | Monolithic integrated circuitry with dielectric isolated fu… | Expired / Lapsed | 1966-06-02 | 1969-10-14 | 0 | Details |
| US3469239A | Interlocking means for a multi-processor system | Expired / Lapsed | 1965-12-02 | 1969-09-23 | 0 | Details |
| US3457552A | Adaptive self-organizing pattern recognizing system | Expired / Lapsed | 1966-10-24 | 1969-07-22 | 0 | Details |
| US3447238A | Method of making a field effect transistor by diffusion,coa… | Expired / Lapsed | 1965-08-09 | 1969-06-03 | 0 | Details |
| US3445787A | Tunable,frequency stabilized laser | Expired / Lapsed | 1966-08-01 | 1969-05-20 | 2 | Details |
| US3445838A | Stroboscopic display device with buffer input and separate … | Expired / Lapsed | 1965-08-23 | 1969-05-20 | 0 | Details |
| US3445663A | Noise discrimination by unblanking during the time that an … | Expired / Lapsed | 1964-06-25 | 1969-05-20 | 0 | Details |
| US3444381A | Silicon photodiode having folded electrode to increase ligh… | Expired / Lapsed | 1967-05-22 | 1969-05-13 | 0 | Details |
| US3441934A | Doppler shift correction analog computer | Expired / Lapsed | 1967-07-12 | 1969-04-29 | 0 | Details |
| US3431392A | Internally heated crystal devices | Expired / Lapsed | 1967-01-13 | 1969-03-04 | 0 | Details |
| US3417374A | Computer-controlled data transferring buffer | Expired / Lapsed | 1966-01-24 | 1968-12-17 | 0 | Details |
| US3414718A | Counting circuit | Expired / Lapsed | 1964-12-16 | 1968-12-03 | 0 | Details |
| US3404399A | Digital clutter rejection system | Expired / Lapsed | 1966-04-22 | 1968-10-01 | 0 | Details |
| US3403307A | Strain sensitive barrier junction semiconductor device | Expired / Lapsed | 1963-02-26 | 1968-09-24 | 0 | Details |
| US3397401A | Voice operated communication system | Expired / Lapsed | 1966-05-27 | 1968-08-13 | 0 | Details |
| US3394371A | Vehicle motion nulling system | Expired / Lapsed | 1966-10-27 | 1968-07-23 | 0 | Details |
| US3392622A | Electromagnetic rotation sensor | Expired / Lapsed | 1964-06-09 | 1968-07-16 | 0 | Details |
| US3383621A | Laser crystal with prismatic end surface | Expired / Lapsed | 1962-05-18 | 1968-05-14 | 2 | Details |
| US3377471A | System effectiveness simulator and computer | Expired / Lapsed | 1964-07-21 | 1968-04-09 | 2 | Details |
| US3374465A | Multiprocessor system having floating executive control | Expired / Lapsed | 1965-03-19 | 1968-03-19 | 0 | Details |
| US3369163A | Straight line motor control for an x-y plotter | Expired / Lapsed | 1961-12-29 | 1968-02-13 | 2 | Details |
| US3354714A | Marine speedometer | Expired / Lapsed | 1964-12-01 | 1967-11-28 | 2 | Details |
| US3353177A | Radar clutter video processing system | Expired / Lapsed | 1966-04-04 | 1967-11-14 | 2 | Details |
| US3353115A | Ruby laser systems | Expired / Lapsed | 1965-11-29 | 1967-11-14 | 2 | Details |
| US3349244A | Ir background noise discriminator through selective time ga… | Expired / Lapsed | 1964-06-25 | 1967-10-24 | 2 | Details |
| US3349174A | Beam scanning device | Expired / Lapsed | 1964-02-03 | 1967-10-24 | 2 | Details |
| US3344420A | Data collection system | Expired / Lapsed | 1965-02-05 | 1967-09-26 | 2 | Details |
| US3344322A | Metal-oxide-semiconductor field effect transistor | Expired / Lapsed | 1965-01-22 | 1967-09-26 | 2 | Details |
| US3343140A | Banked memory system | Expired / Lapsed | 1964-10-27 | 1967-09-19 | 2 | Details |
| US3336534A | Multi-phase detector and keyed-error detector phase-locked-… | Expired / Lapsed | 1965-02-08 | 1967-08-15 | 2 | Details |
| US3333267A | Electronic data processing system | Expired / Lapsed | 1965-05-14 | 1967-07-25 | 2 | Details |
| US3326718A | Method for making an electrical capacitor | Expired / Lapsed | 1963-12-30 | 1967-06-20 | 2 | Details |
| US3320424A | Photosensitive optical angle tracker | Expired / Lapsed | 1963-11-21 | 1967-05-16 | 1 | Details |
| US3319188A | Phase modulator using a varactor passive t-network | Expired / Lapsed | 1964-05-26 | 1967-05-09 | 2 | Details |
| US3305867A | Antenna array system | Expired / Lapsed | 1963-11-05 | 1967-02-21 | 1 | Details |
| US3305635A | Multitone data transmission system with data bits comprised… | Expired / Lapsed | 1963-02-25 | 1967-02-21 | 2 | Details |
| US3305751A | Traveling wave device | Expired / Lapsed | 1962-10-26 | 1967-02-21 | 2 | Details |
| US3277396A | Means for modulating a laser | Expired / Lapsed | 1962-04-23 | 1966-10-04 | 2 | Details |
| US3242494A | Position determination system | Expired / Lapsed | 1962-01-25 | 1966-03-22 | 2 | Details |
| US3223944A | Laser employing elliptical reflector cavity | Expired / Lapsed | 1964-06-25 | 1965-12-14 | 0 | Details |
| US3223965A | Shallow water depth alarm | Expired / Lapsed | 1963-01-23 | 1965-12-14 | 2 | Details |
| US3222454A | Digital comparison circuits | Expired / Lapsed | 1962-06-18 | 1965-12-07 | 2 | Details |
| US3218532A | Numerically controlled positioning system | Expired / Lapsed | 1962-12-03 | 1965-11-16 | 2 | Details |
| US3199049A | Optical maser system for obtaining short pulses of emitted … | Expired / Lapsed | 1961-08-18 | 1965-08-03 | 4 | Details |
| US3191205A | Machine tool with feed rate control | Expired / Lapsed | 1962-02-28 | 1965-06-29 | 0 | Details |
| US3182308A | Composite display system | Expired / Lapsed | 1961-12-29 | 1965-05-04 | 2 | Details |
| FR1396034A | Single mode laser | Expired / Lapsed | 1964-04-27 | 1965-04-16 | 0 | Details |
| US3178592A | Locking read amplifier with binary storage | Expired / Lapsed | 1962-04-10 | 1965-04-13 | 2 | Details |
| US3173078A | Overload protective power supply | Expired / Lapsed | 1960-12-01 | 1965-03-09 | 2 | Details |
| US3149396A | Method of making semiconductor assemblies | Expired / Lapsed | 1961-01-18 | 1964-09-22 | 2 | Details |
| US3143645A | Two-way data compare-sort apparatus | Expired / Lapsed | 1961-02-01 | 1964-08-04 | 1 | Details |
| US3141163A | Range gating system with narrow band filtering | Expired / Lapsed | 1958-08-06 | 1964-07-14 | 2 | Details |
| US3133282A | Apparatus providing a rotating directive antenna field patt… | Expired / Lapsed | 1961-09-28 | 1964-05-12 | 2 | Details |
| US3132339A | Sideband cancellation system | Expired / Lapsed | 1961-01-03 | 1964-05-05 | 1 | Details |
| US3128332A | Electrical interconnection grid and method of making same | Expired / Lapsed | 1960-03-30 | 1964-04-07 | 2 | Details |
| US3127513A | Pyrographite polarizer | Expired / Lapsed | 1961-01-30 | 1964-03-31 | 1 | Details |
| US3115588A | Electroacoustical apparatus | Expired / Lapsed | 1958-02-05 | 1963-12-24 | 2 | Details |
| US3110022A | Radar antenna speed reference apparatus | Expired / Lapsed | 1960-04-29 | 1963-11-05 | 2 | Details |
| US3099805A | Bidirectional coupling between waveguides via two nonrecipr… | Expired / Lapsed | 1956-01-09 | 1963-07-30 | 2 | Details |
| US3095880A | Diathermy applicators | Expired / Lapsed | 1958-11-24 | 1963-07-02 | 2 | Details |
| US3094665A | Means for the detection of signals in the presence of noise | Expired / Lapsed | 1959-04-27 | 1963-06-18 | 2 | Details |
| US3086139A | Cathode ray storage tube | Expired / Lapsed | 1960-09-30 | 1963-04-16 | 2 | Details |
| FR1323829A | Solid state laser | Expired / Lapsed | 1962-04-09 | 1963-04-12 | 0 | Details |
| US3083360A | Electronic scanning radar system | Expired / Lapsed | 1958-04-01 | 1963-03-26 | 1 | Details |
| US3075086A | Diode bridge sampler and capacitor storage device with feed… | Expired / Lapsed | 1958-01-13 | 1963-01-22 | 2 | Details |
| US3072857A | Amplitude ratio detector circuit | Expired / Lapsed | 1960-03-02 | 1963-01-08 | 2 | Details |
| US3068422A | Traveling wave coupled cavity parametric amplifier | Expired / Lapsed | 1961-06-05 | 1962-12-11 | 0 | Details |
| US3061755A | Encapsulated electroluminescent device | Expired / Lapsed | 1959-11-27 | 1962-10-30 | 0 | Details |
| US3060348A | High speed circuit breakers | Expired / Lapsed | 1961-02-24 | 1962-10-23 | 0 | Details |
| US3054068A | Linear amplifier using transistors | Expired / Lapsed | 1960-03-14 | 1962-09-11 | 0 | Details |
| US3053984A | Star tracking system | Expired / Lapsed | 1951-01-05 | 1962-09-11 | 0 | Details |
| US3041605A | Electronically scanned antenna system | Expired / Lapsed | 1958-11-28 | 1962-06-26 | 0 | Details |
| US3030582A | Operational amplifier having direct current amplifier in wh… | Expired / Lapsed | 1959-10-01 | 1962-04-17 | 0 | Details |
| US3028487A | Digital phase demodulation circuit | Expired / Lapsed | 1958-05-01 | 1962-04-03 | 0 | Details |
| US3026500A | Electronic circuits for selectively shifting the time posit… | Expired / Lapsed | 1957-08-29 | 1962-03-20 | 0 | Details |
| US3025191A | Crystal-growing apparatus and methods | Expired / Lapsed | 1960-02-10 | 1962-03-13 | 2 | Details |
| US3021521A | Feed-through nulling systems | Expired / Lapsed | 1955-11-30 | 1962-02-13 | 0 | Details |
| US3020493A | Frequency modulation circuit | Expired / Lapsed | 1959-02-27 | 1962-02-06 | 0 | Details |
| US3020483A | Signal recognition circuit using pulse position modulation … | Expired / Lapsed | 1958-03-03 | 1962-02-06 | 0 | Details |
| US3004253A | Iff system | Expired / Lapsed | 1954-12-20 | 1961-10-10 | 0 | Details |
| US3001190A | Echo ranging devices | Expired / Lapsed | 1953-01-29 | 1961-09-19 | 0 | Details |
| US2998591A | Audible fish alarms | Expired / Lapsed | 1955-01-21 | 1961-08-29 | 0 | Details |
| US2992423A | Rocket launch control systems | Expired / Lapsed | 1954-05-03 | 1961-07-11 | 0 | Details |
| US2985836A | Slicing circuits | Expired / Lapsed | 1958-05-02 | 1961-05-23 | 0 | Details |
| US2984822A | Two-way data compare-sort apparatus | Expired / Lapsed | 1958-11-28 | 1961-05-16 | 0 | Details |
| US2983786A | Optical scanning device | Expired / Lapsed | 1958-08-29 | 1961-05-09 | 0 | Details |
| US2982883A | Electrical component locking arrangement | Expired / Lapsed | 1957-08-23 | 1961-05-02 | 0 | Details |
| US2982955A | Moving target indicating system | Expired / Lapsed | 1950-07-25 | 1961-05-02 | 0 | Details |
| US2982954A | Radar system for producing a remote plan position indication | Expired / Lapsed | 1947-04-29 | 1961-05-02 | 0 | Details |
| US2978615A | Electric trigger circuits | Expired / Lapsed | 1957-05-01 | 1961-04-04 | 0 | Details |
| US2978565A | Insulated wire strippers | Expired / Lapsed | 1957-02-12 | 1961-04-04 | 0 | Details |
| US2963637A | Voltage regulator | Expired / Lapsed | 1956-12-03 | 1960-12-06 | 0 | Details |
| US2961613A | Linear frequency discriminator | Expired / Lapsed | 1956-01-19 | 1960-11-22 | 0 | Details |
| US2960015A | Method and means for making circular variable density filte… | Expired / Lapsed | 1956-09-24 | 1960-11-15 | 0 | Details |
| US2949931A | Magnetic check valve | Expired / Lapsed | 1958-01-29 | 1960-08-23 | 0 | Details |
| US2949773A | Measurement of relative velocity between fluid and solid bo… | Expired / Lapsed | 1955-01-20 | 1960-08-23 | 0 | Details |
| US2945964A | Pulsed output transistor flip-flop | Expired / Lapsed | 1956-10-31 | 1960-07-19 | 0 | Details |
| US2943296A | Sonic apparatus for measuring the level of stored materials | Expired / Lapsed | 1955-08-09 | 1960-06-28 | 0 | Details |
| US2936116A | Electronic digital computer | Expired / Lapsed | 1952-11-12 | 1960-05-10 | 0 | Details |
| US2935735A | Magnetic control systems | Expired / Lapsed | 1955-03-08 | 1960-05-03 | 0 | Details |
| US2932471A | Broad bandwidth digital servo | Expired / Lapsed | 1954-09-30 | 1960-04-12 | 0 | Details |
| US2930028A | Circuits for selectively shifting, extracting, and insertin… | Expired / Lapsed | 1953-12-07 | 1960-03-22 | 0 | Details |
| US2926341A | Automatic timing track recording apparatus | Expired / Lapsed | 1956-02-01 | 1960-02-23 | 0 | Details |
| US2923589A | Block identifying marker system | Expired / Lapsed | 1955-01-26 | 1960-02-02 | 0 | Details |
| US2918587A | Clock-pulse insertion circuit | Expired / Lapsed | 1956-04-02 | 1959-12-22 | 0 | Details |
| US2915678A | Electrical mounting devices | Expired / Lapsed | 1955-06-14 | 1959-12-01 | 0 | Details |
| US2915747A | Echo ranging system | Expired / Lapsed | 1950-10-05 | 1959-12-01 | 0 | Details |
| US2914762A | Dual channel noise coherence reducers | Expired / Lapsed | 1954-02-24 | 1959-11-24 | 0 | Details |
| US2911555A | Traveling-wave tube | Expired / Lapsed | 1957-09-04 | 1959-11-03 | 0 | Details |
| US2908888A | Acoustic logs | Expired / Lapsed | 1956-03-16 | 1959-10-13 | 0 | Details |
| US2907877A | Algebraic magnitude comparators | Expired / Lapsed | 1954-05-18 | 1959-10-06 | 0 | Details |
| US2904404A | Preparation of silicon | Expired / Lapsed | 1957-01-09 | 1959-09-15 | 2 | Details |
| US2903677A | Timing track recording apparatus | Expired / Lapsed | 1956-01-13 | 1959-09-08 | 0 | Details |
| US2900271A | Electroluminescent devices and methods therefor | Expired / Lapsed | 1958-07-29 | 1959-08-18 | 1 | Details |
| US2900620A | Electronic magnitude comparator | Expired / Lapsed | 1953-11-25 | 1959-08-18 | 0 | Details |
| US2898479A | Clock pulse circuit for transistor flip-flop | Expired / Lapsed | 1957-06-28 | 1959-08-04 | 0 | Details |
| US2897462A | Variable reluctance electromagnetic device | Expired / Lapsed | 1956-06-01 | 1959-07-28 | 0 | Details |
| US2895858A | Method of producing semiconductor crystal bodies | Expired / Lapsed | 1955-06-21 | 1959-07-21 | 1 | Details |
| US2896117A | Linear magnetron traveling wave tube | Expired / Lapsed | 1955-02-28 | 1959-07-21 | 0 | Details |
| US2896198A | Electrical analog-to-digital converter | Expired / Lapsed | 1953-04-28 | 1959-07-21 | 0 | Details |
| US2894254A | Conversion of binary coded information to pulse pattern form | Expired / Lapsed | 1953-12-10 | 1959-07-07 | 0 | Details |
| US2889393A | Connecting means for etched circuitry | Expired / Lapsed | 1956-07-26 | 1959-06-02 | 0 | Details |
| US2887654A | Electronic tachometer with selected expanded scale | Expired / Lapsed | 1955-04-19 | 1959-05-19 | 0 | Details |
| US2876437A | Electronic circuits for selectively shifting or inverting t… | Expired / Lapsed | 1953-12-28 | 1959-03-03 | 0 | Details |
| US2874076A | Semiconductor translating devices | Expired / Lapsed | 1957-11-29 | 1959-02-17 | 2 | Details |
| US2869804A | Acceleration responsive control surface control limiting sy… | Expired / Lapsed | 1955-07-26 | 1959-01-20 | 0 | Details |
| US2868997A | Switching circuits | Expired / Lapsed | 1958-05-13 | 1959-01-13 | 0 | Details |
| US2866506A | Digital systems for the automatic control of machinery | Expired / Lapsed | 1954-10-25 | 1958-12-30 | 0 | Details |
| US2865564A | High-speed electronic data conversion system | Expired / Lapsed | 1953-04-02 | 1958-12-23 | 0 | Details |
| US2865018A | Intelligence transmission | Expired / Lapsed | 1954-06-25 | 1958-12-16 | 0 | Details |
| US2854366A | Method of making fused junction semiconductor devices | Expired / Lapsed | 1957-11-25 | 1958-09-30 | 2 | Details |
| US2853238A | Binary-coded flip-flop counters | Expired / Lapsed | 1952-12-20 | 1958-09-23 | 0 | Details |
| US2852699A | Magnetic core gating circuits | Expired / Lapsed | 1955-03-23 | 1958-09-16 | 0 | Details |
| US2850566A | High-speed printing system | Expired / Lapsed | 1953-09-08 | 1958-09-02 | 0 | Details |
| US2848698A | Variable reluctance electromagnetic devices | Expired / Lapsed | 1957-04-01 | 1958-08-19 | 0 | Details |
| US2847632A | Electric motor controls | Expired / Lapsed | 1957-04-25 | 1958-08-12 | 0 | Details |
| US2847659A | Coupling circuit for magnetic binaries | Expired / Lapsed | 1956-02-16 | 1958-08-12 | 0 | Details |
| US2846626A | Junction transistors and methods of forming them | Expired / Lapsed | 1954-07-28 | 1958-08-05 | 0 | Details |
| US2843743A | Pulse generator | Expired / Lapsed | 1955-11-04 | 1958-07-15 | 0 | Details |
| US2843806A | Cross-cooled cabinet for electrical equipment | Expired / Lapsed | 1955-04-29 | 1958-07-15 | 0 | Details |
| US2843351A | Balanced servo valve | Expired / Lapsed | 1955-01-31 | 1958-07-15 | 0 | Details |
| US2841775A | Frequency responsive systems | Expired / Lapsed | 1950-05-25 | 1958-07-01 | 0 | Details |
| US2840709A | Frequency to digital conversion | Expired / Lapsed | 1956-07-02 | 1958-06-24 | 0 | Details |
| US2840806A | Voltage state to digital converter | Expired / Lapsed | 1955-10-12 | 1958-06-24 | 0 | Details |
| US2840308A | Electronic correlator | Expired / Lapsed | 1955-06-02 | 1958-06-24 | 0 | Details |
| US2840818A | Slotted antenna | Expired / Lapsed | 1954-04-15 | 1958-06-24 | 0 | Details |
| US2837732A | Electronic magnitude comparator | Expired / Lapsed | 1953-11-25 | 1958-06-03 | 0 | Details |
| US2833657A | Microwave irradiation of fruit juices | Expired / Lapsed | 1954-01-08 | 1958-05-06 | 2 | Details |
| US2832070A | Binary decoder | Expired / Lapsed | 1956-01-04 | 1958-04-22 | 0 | Details |
| US2830238A | Heat dissipating semiconductor device | Expired / Lapsed | 1955-09-30 | 1958-04-08 | 2 | Details |
| US2830199A | Pulse generating circuits | Expired / Lapsed | 1954-11-30 | 1958-04-08 | 0 | Details |
| US2830162A | Heating method and apparatus | Expired / Lapsed | 1954-06-22 | 1958-04-08 | 0 | Details |
| US2828232A | Method for producing junctions in semi-conductor device | Expired / Lapsed | 1956-05-01 | 1958-03-25 | 2 | Details |
| US2827565A | Current regulators | Expired / Lapsed | 1954-02-17 | 1958-03-18 | 0 | Details |
| US2825884A | Echo ranging devices | Expired / Lapsed | 1953-05-14 | 1958-03-04 | 0 | Details |
| US2824243A | Compression type accelerometer | Expired / Lapsed | 1956-06-01 | 1958-02-18 | 0 | Details |
| US2824287A | Signal-amplitude to pulse-duration converter | Expired / Lapsed | 1955-05-13 | 1958-02-18 | 0 | Details |
| US2823678A | Diathermy power controls | Expired / Lapsed | 1954-04-29 | 1958-02-18 | 0 | Details |
| US2823855A | Serial arithmetic units for binary-coded decimal computers | Expired / Lapsed | 1952-11-26 | 1958-02-18 | 0 | Details |
| US2822502A | Slow-wave structure | Expired / Lapsed | 1955-04-05 | 1958-02-04 | 0 | Details |
| US2821696A | Electronic multiple comparator | Expired / Lapsed | 1953-11-25 | 1958-01-28 | 0 | Details |
| US2820143A | Transistor phase detector | Expired / Lapsed | 1955-04-19 | 1958-01-14 | 0 | Details |
| US2816226A | Counter circuit | Expired / Lapsed | 1956-12-31 | 1957-12-10 | 0 | Details |
| US2816237A | System for coupling signals into and out of flip-flops | Expired / Lapsed | 1955-05-31 | 1957-12-10 | 0 | Details |
| US2816223A | Binary-coded, flip-flop counters | Expired / Lapsed | 1952-12-23 | 1957-12-10 | 0 | Details |
| US2815303A | Method of making junction single crystals | Expired / Lapsed | 1953-07-24 | 1957-12-03 | 2 | Details |
| US2815168A | Automatic program control system for a digital computer | Expired / Lapsed | 1951-11-14 | 1957-12-03 | 0 | Details |
| US2814736A | Linear saw-tooth wave generator | Expired / Lapsed | 1956-05-14 | 1957-11-26 | 0 | Details |
| US2814774A | Continuity and short tester | Expired / Lapsed | 1955-12-02 | 1957-11-26 | 0 | Details |
| US2814725A | Time discriminator | Expired / Lapsed | 1953-05-21 | 1957-11-26 | 0 | Details |
| US2806946A | Pulse coincidence circuit | Expired / Lapsed | 1952-06-02 | 1957-09-17 | 0 | Details |
| US2806080A | Bushings | Expired / Lapsed | 1953-04-03 | 1957-09-10 | 0 | Details |
| US2803401A | Arithmetic units for digital computers | Expired / Lapsed | 1956-08-31 | 1957-08-20 | 0 | Details |
| US2800073A | High speed paper advance system | Expired / Lapsed | 1954-12-17 | 1957-07-23 | 0 | Details |
| US2799727A | Electronic commutated channel separators | Expired / Lapsed | 1952-11-08 | 1957-07-16 | 0 | Details |
| US2795780A | Radar relay links | Expired / Lapsed | 1951-12-21 | 1957-06-11 | 0 | Details |
| US2793335A | Electrical servo system | Expired / Lapsed | 1954-09-14 | 1957-05-21 | 0 | Details |
| US2792829A | Frequency modulated ultrasonic therapeutic apparatus | Expired / Lapsed | 1952-02-06 | 1957-05-21 | 0 | Details |
| US2789557A | Ultrasonic therapeutic devices | Expired / Lapsed | 1952-01-07 | 1957-04-23 | 0 | Details |
| US2788381A | Fused-junction semiconductor photocells | Expired / Lapsed | 1955-07-26 | 1957-04-09 | 2 | Details |
| US2787416A | Electrical calculating machines | Expired / Lapsed | 1951-10-23 | 1957-04-02 | 0 | Details |
| US2782398A | Apparatus for photoelectrically cataloging digital data on … | Expired / Lapsed | 1953-08-28 | 1957-02-19 | 0 | Details |
| US2776618A | Printing cylinders for high-speed printing systems | Expired / Lapsed | 1953-06-11 | 1957-01-08 | 0 | Details |
| US2775721A | Electron discharge devices | Expired / Lapsed | 1953-09-14 | 1956-12-25 | 0 | Details |
| US2774941A | Communication systems | Expired / Lapsed | 1952-11-14 | 1956-12-18 | 0 | Details |
| US2774068A | Diathermy applicators | Expired / Lapsed | 1953-02-16 | 1956-12-11 | 0 | Details |
| US2764343A | Electronic switching and counting circuit | Expired / Lapsed | 1952-02-25 | 1956-09-25 | 0 | Details |
| US2760127A | Capacitor commutator | Expired / Lapsed | 1954-03-22 | 1956-08-21 | 0 | Details |
| US2760186A | Visual indicating devices | Expired / Lapsed | 1953-04-09 | 1956-08-21 | 0 | Details |
| US2758206A | Transistor pulse generator | Expired / Lapsed | 1955-08-03 | 1956-08-07 | 0 | Details |
| US2757279A | Two-way communication systems | Expired / Lapsed | 1951-11-20 | 1956-07-31 | 0 | Details |
| US2747797A | Rotational analogue-to-digital converters | Expired / Lapsed | 1951-08-20 | 1956-05-29 | 0 | Details |
| US2739882A | Surface treatment of germanium | Expired / Lapsed | 1954-02-25 | 1956-03-27 | 1 | Details |
| US2738259A | Surface treatment of germanium | Expired / Lapsed | 1954-02-24 | 1956-03-13 | 1 | Details |
| US2728872A | Direct-viewing storage tube with character writing electron… | Expired / Lapsed | 1953-10-23 | 1955-12-27 | 0 | Details |
| US2725554A | System for recording discontinuous signals in continuous se… | Expired / Lapsed | 1952-07-05 | 1955-11-29 | 0 | Details |
| US2723080A | Triggering networks for flip-flop circuits | Expired / Lapsed | 1951-09-08 | 1955-11-08 | 0 | Details |
| US2722607A | Frequency control | Expired / Lapsed | 1951-02-23 | 1955-11-01 | 0 | Details |
| US2721259A | Method and system for signalling having spectral modulation | Expired / Lapsed | 1952-05-31 | 1955-10-18 | 0 | Details |
| US2720617A | Transistor packages | Expired / Lapsed | 1953-11-02 | 1955-10-11 | 0 | Details |
| US2718634A | Digital-to-analogue converter | Expired / Lapsed | 1951-07-28 | 1955-09-20 | 0 | Details |
| US2714070A | Microwave heating apparatus and method of heating a food pa… | Expired / Lapsed | 1950-04-04 | 1955-07-26 | 1 | Details |
| US2709770A | Stepped signal producing system | Expired / Lapsed | 1951-08-15 | 1955-05-31 | 0 | Details |
| US2708718A | Phase detector | Expired / Lapsed | 1952-11-26 | 1955-05-17 | 0 | Details |
| US2708646A | Methods of making germanium alloy semiconductors | Expired / Lapsed | 1951-05-09 | 1955-05-17 | 2 | Details |
| US2707591A | Multiple-stable-state storage devices | Expired / Lapsed | 1952-05-07 | 1955-05-03 | 0 | Details |
| US2704333A | Ultrasonic vibratory devices | Expired / Lapsed | 1951-03-15 | 1955-03-15 | 0 | Details |
| US2703853A | Folding terminal board for circuit components | Expired / Lapsed | 1952-01-18 | 1955-03-08 | 0 | Details |
| US2703382A | Two-way limiting network | Expired / Lapsed | 1952-12-11 | 1955-03-01 | 0 | Details |
| US2701346A | Connector for circuit cards | Expired / Lapsed | 1953-11-05 | 1955-02-01 | 0 | Details |
| US2701328A | Antihunt means for electric motor follow-up systems | Expired / Lapsed | 1949-07-29 | 1955-02-01 | 0 | Details |
| US2697811A | Current limiting voltage regulator | Expired / Lapsed | 1954-02-03 | 1954-12-21 | 0 | Details |
| US2695165A | Electromagnetic accelerometer | Expired / Lapsed | 1950-07-14 | 1954-11-23 | 0 | Details |
| US2694149A | Electronic regulator system | Expired / Lapsed | 1950-06-29 | 1954-11-09 | 0 | Details |
| US2685073A | Detachable electrical connector | Expired / Lapsed | 1952-10-31 | 1954-07-27 | 0 | Details |
| US2685039A | Diode gating circuits | Expired / Lapsed | 1952-03-13 | 1954-07-27 | 0 | Details |
| US2685079A | Flutter compensation means for recording systems | Expired / Lapsed | 1951-02-07 | 1954-07-27 | 0 | Details |
| US2682511A | Thermionic cathodes | Expired / Lapsed | 1950-12-16 | 1954-06-29 | 2 | Details |
| US2680333A | Tool chuck for vibrating devices | Expired / Lapsed | 1951-03-16 | 1954-06-08 | 0 | Details |
| US2673306A | Magnetron amplifier | Expired / Lapsed | 1949-03-16 | 1954-03-23 | 0 | Details |
| US2671853A | Energy radiation apparatus | Expired / Lapsed | 1952-03-01 | 1954-03-09 | 0 | Details |
| US2659818A | High-frequency directed radio energy system | Expired / Lapsed | 1950-07-21 | 1953-11-17 | 0 | Details |
| US2659856A | Duration ratio regulator | Expired / Lapsed | 1948-04-21 | 1953-11-17 | 0 | Details |
| US2658139A | Binary decoding system | Expired / Lapsed | 1950-03-29 | 1953-11-03 | 0 | Details |
| US2652475A | Microwave apparatus | Expired / Lapsed | 1950-06-07 | 1953-09-15 | 0 | Details |
| US2638588A | Electromagnetic-radiating system | Expired / Lapsed | 1950-10-20 | 1953-05-12 | 0 | Details |
| US2634052A | Diagnostic information monitoring system | Expired / Lapsed | 1949-04-27 | 1953-04-07 | 0 | Details |
| US2632858A | Support for vibratory devices | Expired / Lapsed | 1950-11-16 | 1953-03-24 | 0 | Details |
| US2627055A | Electronic position and motion control system | Expired / Lapsed | 1949-10-25 | 1953-01-27 | 0 | Details |
| US2623116A | Recording device | Expired / Lapsed | 1947-11-21 | 1952-12-23 | 0 | Details |
| US2622187A | Microwave pressure cooker | Expired / Lapsed | 1947-01-14 | 1952-12-16 | 0 | Details |
| US2617039A | Harmonic frequency selector | Expired / Lapsed | 1947-04-29 | 1952-11-04 | 0 | Details |
| US2616048A | Relaxation oscillator circuits | Expired / Lapsed | 1948-03-23 | 1952-10-28 | 0 | Details |
| US2607006A | Binary decoding system | Expired / Lapsed | 1950-03-22 | 1952-08-12 | 0 | Details |
| US2599033A | High-frequency apparatus | Expired / Lapsed | 1946-11-15 | 1952-06-03 | 0 | Details |
| US2585173A | Radio-frequency transmission line circuit | Expired / Lapsed | 1948-07-01 | 1952-02-12 | 0 | Details |
| US2576395A | Recording and indicating system | Expired / Lapsed | 1948-10-28 | 1951-11-27 | 0 | Details |
| US2568090A | Balanced mixer | Expired / Lapsed | 1948-06-22 | 1951-09-18 | 0 | Details |
| US2567757A | Therapeutic device | Expired / Lapsed | 1947-02-26 | 1951-09-11 | 0 | Details |
| US2560903A | Wave guide dielectric heating apparatus | Expired / Lapsed | 1949-08-27 | 1951-07-17 | 0 | Details |
| US2560124A | Interval measuring system | Expired / Lapsed | 1950-03-31 | 1951-07-10 | 0 | Details |
| US2559575A | Electrical control system | Expired / Lapsed | 1947-01-31 | 1951-07-03 | 0 | Details |
| US2540036A | Food cooking | Expired / Lapsed | 1948-03-26 | 1951-01-30 | 2 | Details |
| US2539553A | Recording system | Expired / Lapsed | 1945-10-19 | 1951-01-30 | 0 | Details |
| US2530705A | Electrical control systems | Expired / Lapsed | 1943-04-15 | 1950-11-21 | 0 | Details |
| US2523222A | Frequency modulation system | Expired / Lapsed | 1947-04-05 | 1950-09-19 | 0 | Details |
| US2517635A | Radar marker circuit | Expired / Lapsed | 1949-02-16 | 1950-08-08 | 0 | Details |
| US2504231A | Gaseous discharge device | Expired / Lapsed | 1945-10-26 | 1950-04-18 | 0 | Details |
| US2502405A | Electron-discharge device of the magnetron type | Expired / Lapsed | 1948-12-20 | 1950-03-28 | 0 | Details |
| US2499520A | Distance measuring device | Expired / Lapsed | 1947-01-31 | 1950-03-07 | 0 | Details |
| US2495435A | Method of treating foodstuffs | Expired / Lapsed | 1947-01-14 | 1950-01-24 | 2 | Details |
| US2495415A | High-frequency electromagnetic cooking apparatus | Expired / Lapsed | 1945-10-17 | 1950-01-24 | 0 | Details |
| US2495429A | Method of treating foodstuffs | Expired / Lapsed | 1945-10-08 | 1950-01-24 | 2 | Details |
| US2486021A | Oscillator | Expired / Lapsed | 1945-02-28 | 1949-10-25 | 0 | Details |
| US2485124A | Harmonic generator | Expired / Lapsed | 1946-11-30 | 1949-10-18 | 0 | Details |
| US2480679A | Prepared food article and method of preparing | Expired / Lapsed | 1947-03-29 | 1949-08-30 | 0 | Details |
| US2480646A | Speed measuring device | Expired / Lapsed | 1945-01-17 | 1949-08-30 | 0 | Details |
| US2478207A | Vibrating apparatus | Expired / Lapsed | 1945-09-05 | 1949-08-09 | 0 | Details |
| US2477622A | Condenser welding system | Expired / Lapsed | 1945-05-01 | 1949-08-02 | 0 | Details |
| US2477428A | Communication relay station | Expired / Lapsed | 1946-11-06 | 1949-07-26 | 0 | Details |
| US2476940A | Subminiature type vacuum tube structure | Expired / Lapsed | 1947-05-22 | 1949-07-19 | 0 | Details |
| US2466028A | Controlled peaking transformer | Expired / Lapsed | 1945-05-08 | 1949-04-05 | 0 | Details |
| US2464269A | Method and means for controlling the polarization of radian… | Expired / Lapsed | 1942-06-12 | 1949-03-15 | 0 | Details |
| US2462841A | Frequency-stabilizing system | Expired / Lapsed | 1946-03-18 | 1949-03-01 | 0 | Details |
| US2462893A | Modulator | Expired / Lapsed | 1946-03-07 | 1949-03-01 | 0 | Details |
| US2455952A | Magnetron | Expired / Lapsed | 1945-01-09 | 1948-12-14 | 0 | Details |
| US2445774A | Picture receiver utilizing anomalous reflection from silver | Expired / Lapsed | 1945-08-20 | 1948-07-27 | 0 | Details |
| US2439786A | Electron discharge device | Expired / Lapsed | 1944-11-07 | 1948-04-20 | 0 | Details |
| US2433837A | Gyro-controlled stabilizing system | Expired / Lapsed | 1944-01-03 | 1948-01-06 | 0 | Details |
| US2428048A | Electron discharge device | Expired / Lapsed | 1945-09-15 | 1947-09-30 | 0 | Details |
| US2411155A | Television receiving system | Expired / Lapsed | 1944-09-14 | 1946-11-19 | 0 | Details |
| US2408237A | Tunable magnetron | Expired / Lapsed | 1942-03-06 | 1946-09-24 | 0 | Details |
| US2402983A | Electronic discharge tube | Expired / Lapsed | 1941-11-26 | 1946-07-02 | 0 | Details |
| US2395881A | Controlled peaking trasformer | Expired / Lapsed | 1940-08-02 | 1946-03-05 | 0 | Details |
| US2386820A | Method of forming seals | Expired / Lapsed | 1941-12-22 | 1945-10-16 | 0 | Details |
| US2383492A | Voltage regulator | Expired / Lapsed | 1942-10-10 | 1945-08-28 | 0 | Details |
| US2375830A | Device for producing successive electrical impulses | Expired / Lapsed | 1942-03-31 | 1945-05-15 | 0 | Details |
| US2356765A | Welding system | Expired / Lapsed | 1942-10-23 | 1944-08-29 | 0 | Details |
| US2355083A | Electrode assembly for discharge tubes | Expired / Lapsed | 1941-01-03 | 1944-08-08 | 0 | Details |
| US2353733A | Welding system | Expired / Lapsed | 1943-07-03 | 1944-07-18 | 0 | Details |
| US2338118A | Inverter | Expired / Lapsed | 1940-08-06 | 1944-01-04 | 0 | Details |
| US2319215A | Condenser welding system | Expired / Lapsed | 1941-08-15 | 1943-05-18 | 0 | Details |
| US2269460A | Condenser welding system | Expired / Lapsed | 1940-02-05 | 1942-01-13 | 0 | Details |
| US2233416A | Inverter | Expired / Lapsed | 1940-01-09 | 1941-03-04 | 0 | Details |
| US2092891A | Voltage regulators connected in parallel | Expired / Lapsed | 1935-01-29 | 1937-09-14 | 0 | Details |
| US1985634A | Regulating system | Expired / Lapsed | 1928-04-04 | 1934-12-25 | 0 | Details |
| US1933396A | Gaseous conduction apparatus | Expired / Lapsed | 1928-10-29 | 1933-10-31 | 0 | Details |
| US1863702A | Gaseous conduction method and apparatus | Expired / Lapsed | 1926-04-12 | 1932-06-21 | 0 | Details |
| US1679448A | Electrical-current modification | Expired / Lapsed | 1923-05-22 | 1928-08-07 | 0 | Details |