GTE Sylvania Inc
GTE SylvanActive Patents
0
Total Holdings
265
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| GB634187A | Improvements relating to the coating of metal filaments wit… | Expired / Lapsed | 1947-02-14 | — | 0 | Details |
| US4166667A | Circuit board connector | Expired / Lapsed | 1978-04-17 | 1979-09-04 | 10 | Details |
| US4157729A | Apparatus and method for producing filaments | Expired / Lapsed | 1977-11-21 | 1979-06-12 | 14 | Details |
| US4153572A | Ultraviolet emitting CeYMg aluminate fluorescent lamp phosp… | Expired / Lapsed | 1978-06-14 | 1979-05-08 | 4 | Details |
| US4145719A | Multi-channel video switch using dual-gate MOS-FETS | Expired / Lapsed | 1977-09-28 | 1979-03-20 | 2 | Details |
| US4058639A | Method of making fluorescent lamp | Expired / Lapsed | 1975-12-09 | 1977-11-15 | 5 | Details |
| US3990761A | Zero force connector assembly | Expired / Lapsed | 1975-08-11 | 1976-11-09 | 11 | Details |
| US3985442A | Data acquisition system for spectrophotometer | Expired / Lapsed | 1974-06-07 | 1976-10-12 | 13 | Details |
| US3943994A | Ceramic cellular structure having high cell density and met… | Expired / Lapsed | 1974-03-27 | 1976-03-16 | 6 | Details |
| US3923682A | Process for manufacturing phosphors | Expired / Lapsed | 1969-12-29 | 1975-12-02 | 6 | Details |
| US3922582A | Current limited oxcillator arrangement | Expired / Lapsed | 1974-08-22 | 1975-11-25 | 15 | Details |
| US3885182A | Lamp having light diffusing envelope | Expired / Lapsed | 1973-09-20 | 1975-05-20 | 2 | Details |
| US3860499A | Electroplating apparatus and method | Expired / Lapsed | 1973-04-19 | 1975-01-14 | 21 | Details |
| US3826873A | Switching circuit employing latching type semiconductor dev… | Expired / Lapsed | 1971-10-12 | 1974-07-30 | 5 | Details |
| US3792284A | Electro-optic transmission link | Expired / Lapsed | 1972-10-13 | 1974-02-12 | 9 | Details |
| US3781850A | Television type display system for displaying information i… | Expired / Lapsed | 1972-06-21 | 1973-12-25 | 9 | Details |
| US3778811A | Display system with graphic fill-in | Expired / Lapsed | 1972-06-21 | 1973-12-11 | 13 | Details |
| US3765009A | Apparatus for displaying waveforms of time-varying signals … | Expired / Lapsed | 1972-03-01 | 1973-10-09 | 8 | Details |
| US3754271A | Broadband antenna polarizer | Expired / Lapsed | 1972-07-03 | 1973-08-21 | 6 | Details |
| US3752139A | Electronic ignition timing system for internal combustion e… | Expired / Lapsed | 1971-11-23 | 1973-08-14 | 17 | Details |
| US3744905A | Apparatus for measuring and marking aperture masks | Expired / Lapsed | 1971-06-24 | 1973-07-10 | 14 | Details |
| US3732536A | Passive object detection apparatus including ambient noise … | Expired / Lapsed | 1970-09-18 | 1973-05-08 | 28 | Details |
| US3717813A | Amplifier station | Expired / Lapsed | 1971-04-01 | 1973-02-20 | 10 | Details |
| US3704928A | Dental light with dichroic and infrared filters | Expired / Lapsed | 1970-11-09 | 1972-12-05 | 2 | Details |
| US3696369A | Signal processor | Expired / Lapsed | 1970-12-02 | 1972-10-03 | 31 | Details |
| US3681530A | Method and apparatus for signal bandwidth compression utili… | Expired / Lapsed | 1970-06-15 | 1972-08-01 | 43 | Details |
| US3676358A | Atomizing, spray-drying and flame process for manufacturing… | Expired / Lapsed | 1970-01-02 | 1972-07-11 | 9 | Details |
| US3667947A | Color crt screen exposure method | Expired / Lapsed | 1970-09-04 | 1972-06-06 | 0 | Details |
| US3668455A | Electrical translating device containing spheroidal phospho… | Expired / Lapsed | 1968-07-01 | 1972-06-06 | 11 | Details |
| US3662267A | System for locating and communicating with mobile units | Expired / Lapsed | 1970-05-20 | 1972-05-09 | 10 | Details |
| US3646324A | Information-processing system | Expired / Lapsed | 1970-11-10 | 1972-02-29 | 23 | Details |
| US3629622A | Switching regulator having a low dissipation current overlo… | Expired / Lapsed | 1970-04-03 | 1971-12-21 | 3 | Details |
| US3621284A | Attenuation circuit | Expired / Lapsed | 1970-12-07 | 1971-11-16 | 14 | Details |
| US3611175A | Search circuit for frequency synthesizer | Expired / Lapsed | 1970-03-26 | 1971-10-05 | 15 | Details |
| US3602735A | Pulse shaping circuit for use in integrated circuit networks | Expired / Lapsed | 1969-10-01 | 1971-08-31 | 8 | Details |
| US3597541A | Decision-directed adapted equalizer circuit | Expired / Lapsed | 1969-12-23 | 1971-08-03 | 6 | Details |
| US3594699A | Articulated printed circuit edge connector | Expired / Lapsed | 1969-12-15 | 1971-07-20 | 12 | Details |
| US3577169A | Coexisting crystalline solution phases activated by divalen… | Expired / Lapsed | 1968-08-05 | 1971-05-04 | 6 | Details |
| US3576757A | Novel fluorescent phosphor compositions | Expired / Lapsed | 1968-06-14 | 1971-04-27 | 0 | Details |
| US3573751A | Fault isolation system for modularized electronic equipment | Expired / Lapsed | 1969-04-22 | 1971-04-06 | 12 | Details |
| US3560761A | Transistor logic circuit | Expired / Lapsed | 1968-07-25 | 1971-02-02 | 4 | Details |
| US3556951A | Method of forming leads on semiconductor devices | Expired / Lapsed | 1967-08-04 | 1971-01-19 | 0 | Details |
| US3555554A | Cavity-backed spiral antenna with mode suppression | Expired / Lapsed | 1969-03-03 | 1971-01-12 | 0 | Details |
| US3553433A | Data storage and transfer apparatus for plural-vehicle iden… | Expired / Lapsed | 1967-05-02 | 1971-01-05 | 13 | Details |
| US3530434A | Coded frequency vehicle identification system | Expired / Lapsed | 1967-06-14 | 1970-09-22 | 0 | Details |
| US3529138A | Digital function synthesizer | Expired / Lapsed | 1966-12-30 | 1970-09-15 | 0 | Details |
| US3510667A | Inspection apparatus comprising rotatable and reciprocable … | Expired / Lapsed | 1967-06-23 | 1970-05-05 | 0 | Details |
| US3509347A | Optical superheterodyne system employing non-symmetrical wa… | Expired / Lapsed | 1967-08-07 | 1970-04-28 | 0 | Details |
| US3508124A | Semiconductor device and method of manufacture | Expired / Lapsed | 1968-03-11 | 1970-04-21 | 0 | Details |
| US3508215A | Magnetic thin film memory apparatus | Expired / Lapsed | 1966-11-25 | 1970-04-21 | 0 | Details |
| US3497625A | Digital modulation and demodulation in a communication syst… | Expired / Lapsed | 1965-07-15 | 1970-02-24 | 0 | Details |
| US3488436A | Intrusion detector control for closed circuit television sy… | Expired / Lapsed | 1966-09-29 | 1970-01-06 | 0 | Details |
| US3476947A | Optical intrusion detection system using dual beam peripher… | Expired / Lapsed | 1968-02-19 | 1969-11-04 | 0 | Details |
| US3465344A | Single antenna dual frequency band signal coupling system | Expired / Lapsed | 1967-01-26 | 1969-09-02 | 0 | Details |
| US3456997A | Apparatus for eliminating image distortions | Expired / Lapsed | 1967-07-20 | 1969-07-22 | 0 | Details |
| US3453607A | Digital communications system for reducing the number of me… | Expired / Lapsed | 1965-10-24 | 1969-07-01 | 0 | Details |
| US3435141A | Television camera synchronization control system | Expired / Lapsed | 1965-04-26 | 1969-03-25 | 0 | Details |
| US3434142A | Electronically controlled azimuth scanning antenna system | Expired / Lapsed | 1966-12-30 | 1969-03-18 | 0 | Details |
| US3432852A | Transponder having improved isolation | Expired / Lapsed | 1967-06-19 | 1969-03-11 | 0 | Details |
| US3417231A | Mark sensing system | Expired / Lapsed | 1964-07-30 | 1968-12-17 | 0 | Details |
| US3415995A | Polarization modulation optical communication system | Expired / Lapsed | 1966-12-12 | 1968-12-10 | 0 | Details |
| US3414731A | Package classification by tracking the path of a circular l… | Expired / Lapsed | 1966-10-28 | 1968-12-03 | 2 | Details |
| US3414768A | Semiconductor ballast for discharge lamp | Expired / Lapsed | 1966-01-03 | 1968-12-03 | 0 | Details |
| US3401353A | Automatic coarse tuning system for a frequency synthesizer | Expired / Lapsed | 1967-07-06 | 1968-09-10 | 0 | Details |
| US3399350A | Self-timing decoder for pulse code wherein code structure i… | Expired / Lapsed | 1964-05-18 | 1968-08-27 | 0 | Details |
| US3399012A | Optical transmission line for guiding an optical beam | Expired / Lapsed | 1964-01-31 | 1968-08-27 | 0 | Details |
| US3384887A | Intruder detection system | Expired / Lapsed | 1965-09-03 | 1968-05-21 | 2 | Details |
| US3375511A | Transmission line intruder detection system | Expired / Lapsed | 1965-06-24 | 1968-03-26 | 2 | Details |
| US3366836A | Visual display device | Expired / Lapsed | 1952-08-28 | 1968-01-30 | 2 | Details |
| US3360673A | Lamps having a molybdenum phosphate phosphor | Expired / Lapsed | 1964-06-09 | 1967-12-26 | 2 | Details |
| US3330959A | Fail-safe reflected light-responsive control circuit | Expired / Lapsed | 1964-05-27 | 1967-07-11 | 1 | Details |
| US3329958A | Artificial dielectric lens structure | Expired / Lapsed | 1964-06-11 | 1967-07-04 | 1 | Details |
| US3328719A | Phase-lock loop with adaptive bandwidth | Expired / Lapsed | 1965-08-24 | 1967-06-27 | 2 | Details |
| US3328590A | Automatic gain control for ambient light effects | Expired / Lapsed | 1963-12-11 | 1967-06-27 | 2 | Details |
| US3328651A | Semiconductor switching device and method of manufacture | Expired / Lapsed | 1963-10-29 | 1967-06-27 | 2 | Details |
| US3325632A | Data storage techniques | Expired / Lapsed | 1961-07-12 | 1967-06-13 | 2 | Details |
| US3324472A | Antenna system | Expired / Lapsed | 1964-10-23 | 1967-06-06 | 2 | Details |
| US3309689A | Intrusion detection system | Expired / Lapsed | 1964-10-30 | 1967-03-14 | 2 | Details |
| US3309672A | Electronic computer interrupt system | Expired / Lapsed | 1963-01-04 | 1967-03-14 | 2 | Details |
| US3295110A | Associative memory of multi-plane common solenoid matrices | Expired / Lapsed | 1963-08-16 | 1966-12-27 | 2 | Details |
| US3287586A | Plant growth lamp | Expired / Lapsed | 1963-10-01 | 1966-11-22 | 2 | Details |
| US3284632A | Polarization modulation and demodulation | Expired / Lapsed | 1963-07-31 | 1966-11-08 | 2 | Details |
| US3277489A | Millimeter phased array | Expired / Lapsed | 1963-09-30 | 1966-10-04 | 1 | Details |
| US3263219A | Electronic data processing equipment | Expired / Lapsed | 1963-01-03 | 1966-07-26 | 2 | Details |
| US3247413A | Ultra-violet radiation sensing device | Expired / Lapsed | 1963-12-09 | 1966-04-19 | 2 | Details |
| US3246193A | Display device | Expired / Lapsed | 1963-03-11 | 1966-04-12 | 2 | Details |
| US3246126A | Data processing | Expired / Lapsed | 1960-11-02 | 1966-04-12 | 2 | Details |
| US3238455A | Magazine for supporting a plurality of electrical devices a… | Expired / Lapsed | 1962-04-18 | 1966-03-01 | 2 | Details |
| US3235661A | Communications and data processing equipment | Expired / Lapsed | 1962-07-11 | 1966-02-15 | 2 | Details |
| US3235713A | Automated price computation | Expired / Lapsed | 1959-04-02 | 1966-02-15 | 2 | Details |
| US3229119A | Transistor logic circuits | Expired / Lapsed | 1963-05-17 | 1966-01-11 | 2 | Details |
| US3225177A | Mark sensing | Expired / Lapsed | 1961-09-13 | 1965-12-21 | 2 | Details |
| US3215987A | Electronic data processing | Expired / Lapsed | 1962-06-04 | 1965-11-02 | 2 | Details |
| US3212533A | Method of and apparatus for feeding articles | Expired / Lapsed | 1962-03-27 | 1965-10-19 | 2 | Details |
| US3210737A | Electronic data processing | Expired / Lapsed | 1962-01-29 | 1965-10-05 | 2 | Details |
| US3210171A | Method of supplying heat of fusion to glass-to-glass seal | Expired / Lapsed | 1960-09-12 | 1965-10-05 | 1 | Details |
| US3210733A | Data processing system | Expired / Lapsed | 1958-08-18 | 1965-10-05 | 2 | Details |
| US3189883A | Test and reset circuit for intrusion alarm system | Expired / Lapsed | 1961-12-18 | 1965-06-15 | 1 | Details |
| US3168697A | Method and apparatus for testing marginal failure of electr… | Expired / Lapsed | 1960-11-17 | 1965-02-02 | 2 | Details |
| US3159810A | Data transmission systems with error detection and correcti… | Expired / Lapsed | 1960-03-21 | 1964-12-01 | 2 | Details |
| US3142780A | Cold cathode gas tube counting circuits | Expired / Lapsed | 1950-03-16 | 1964-07-28 | 2 | Details |
| US3139754A | Electronic vacuum gauge | Expired / Lapsed | 1961-06-15 | 1964-07-07 | 2 | Details |
| US3139600A | Variable voltage generator | Expired / Lapsed | 1960-12-12 | 1964-06-30 | 2 | Details |
| US3135951A | Secure communication line | Expired / Lapsed | 1962-05-31 | 1964-06-02 | 2 | Details |
| US3121802A | Multivibrator circuit employing transistors of complementar… | Expired / Lapsed | 1959-01-23 | 1964-02-18 | 2 | Details |
| US3109958A | Electroluminescent devices with overload protection | Expired / Lapsed | 1961-06-22 | 1963-11-05 | 2 | Details |
| US3105868A | Circuit packaging module | Expired / Lapsed | 1960-12-29 | 1963-10-01 | 2 | Details |
| US3098973A | Antenna incorporating active elements | Expired / Lapsed | 1960-05-27 | 1963-07-23 | 2 | Details |
| US3094632A | Exclusive-or transistor logic circuit | Expired / Lapsed | 1960-05-24 | 1963-06-18 | 0 | Details |
| US3094610A | Electronic computers | Expired / Lapsed | 1959-06-02 | 1963-06-18 | 2 | Details |
| US3093707A | Data transmission systems | Expired / Lapsed | 1959-09-24 | 1963-06-11 | 1 | Details |
| US3084227A | Magnetic tape transducer | Expired / Lapsed | 1959-09-29 | 1963-04-02 | 2 | Details |
| US3071647A | Intercommunication system | Expired / Lapsed | 1959-01-07 | 1963-01-01 | 1 | Details |
| US3069749A | Assembling apparatus and methods | Expired / Lapsed | 1954-01-29 | 1962-12-25 | 0 | Details |
| US3069657A | Selective calling system | Expired / Lapsed | 1958-06-11 | 1962-12-18 | 0 | Details |
| US3061192A | Data processing system | Expired / Lapsed | 1958-08-18 | 1962-10-30 | 0 | Details |
| US3059115A | Energy storage device | Expired / Lapsed | 1958-04-10 | 1962-10-16 | 2 | Details |
| US3056906A | Switching circuit | Expired / Lapsed | 1959-12-28 | 1962-10-02 | 0 | Details |
| US3054929A | Switching circuit for use with electroluminescent display d… | Expired / Lapsed | 1959-12-29 | 1962-09-18 | 0 | Details |
| US3049647A | Electrical chassis | Expired / Lapsed | 1958-09-02 | 1962-08-14 | 0 | Details |
| US3035200A | Electroluminescent display device | Expired / Lapsed | 1959-11-25 | 1962-05-15 | 0 | Details |
| US3032191A | Testing and sorting apparatus | Expired / Lapsed | 1959-04-20 | 1962-05-01 | 0 | Details |
| US3027465A | Logic nor circuit with speed-up capacitors having added ser… | Expired / Lapsed | 1958-04-16 | 1962-03-27 | 0 | Details |
| US3015044A | Electroluminescent lamp | Expired / Lapsed | 1956-11-19 | 1961-12-26 | 0 | Details |
| US3003305A | Clock | Expired / Lapsed | 1958-07-10 | 1961-10-10 | 0 | Details |
| US2995686A | Microelectronic circuit module | Expired / Lapsed | 1959-03-02 | 1961-08-08 | 0 | Details |
| US2991407A | Current supply apparatus | Expired / Lapsed | 1958-02-17 | 1961-07-04 | 0 | Details |
| US2979721A | Terminal inserter | Expired / Lapsed | 1958-09-02 | 1961-04-18 | 0 | Details |
| US2976838A | Apparatus for the fabrication of image display screens | Expired / Lapsed | 1957-07-29 | 1961-03-28 | 0 | Details |
| US2971160A | Anode current regulation | Expired / Lapsed | 1958-11-25 | 1961-02-07 | 0 | Details |
| US2966618A | Electrical device mounting | Expired / Lapsed | 1959-05-08 | 1960-12-27 | 0 | Details |
| US2966464A | Method of making silver activated sulphide phosphors | Expired / Lapsed | 1957-10-28 | 1960-12-27 | 1 | Details |
| US2965786A | Calcium halophosphate phosphors | Expired / Lapsed | 1959-04-30 | 1960-12-20 | 2 | Details |
| US2964622A | Image suppressed superheterodyne receiver | Expired / Lapsed | 1957-10-21 | 1960-12-13 | 0 | Details |
| US2960633A | Electronic chassis construction | Expired / Lapsed | 1957-02-07 | 1960-11-15 | 0 | Details |
| US2958009A | Electroluminescent device | Expired / Lapsed | 1959-10-01 | 1960-10-25 | 0 | Details |
| US2951168A | Electroluminescent device | Expired / Lapsed | 1958-11-28 | 1960-08-30 | 0 | Details |
| US2946024A | Strip transmission line switch | Expired / Lapsed | 1958-11-25 | 1960-07-19 | 0 | Details |
| US2944549A | Injection instrument | Expired / Lapsed | 1955-10-25 | 1960-07-12 | 0 | Details |
| US2944167A | Semiconductor oscillator | Expired / Lapsed | 1957-10-21 | 1960-07-05 | 0 | Details |
| US2941202A | Modified cross-correlation radio system and method | Expired / Lapsed | 1951-08-04 | 1960-06-14 | 0 | Details |
| US2937353A | Photoconductive devices | Expired / Lapsed | 1959-02-27 | 1960-05-17 | 0 | Details |
| US2933620A | Two-input ring counters | Expired / Lapsed | 1954-05-27 | 1960-04-19 | 0 | Details |
| US2932770A | Electroluminescent device | Expired / Lapsed | 1958-04-29 | 1960-04-12 | 0 | Details |
| US2932746A | Electroluminescent device | Expired / Lapsed | 1957-02-25 | 1960-04-12 | 2 | Details |
| US2929968A | Thermal switches | Expired / Lapsed | 1956-04-30 | 1960-03-22 | 0 | Details |
| US2925523A | Wave generator | Expired / Lapsed | 1957-02-12 | 1960-02-16 | 0 | Details |
| US2924747A | Shift register | Expired / Lapsed | 1958-06-16 | 1960-02-09 | 0 | Details |
| US2922923A | Electroluminescent devices | Expired / Lapsed | 1959-03-19 | 1960-01-26 | 0 | Details |
| US2922898A | Electronic counter | Expired / Lapsed | 1956-03-27 | 1960-01-26 | 0 | Details |
| US2920196A | Bistable device | Expired / Lapsed | 1957-10-09 | 1960-01-05 | 0 | Details |
| US2918938A | Valve construction | Expired / Lapsed | 1954-03-23 | 1959-12-29 | 0 | Details |
| US2919355A | Bi-stable transistor circuit | Expired / Lapsed | 1953-12-31 | 1959-12-29 | 0 | Details |
| US2917669A | Electroluminescent device | Expired / Lapsed | 1958-12-31 | 1959-12-15 | 0 | Details |
| US2916394A | Processing of image display devices | Expired / Lapsed | 1958-05-06 | 1959-12-08 | 2 | Details |
| US2912794A | Electron tube | Expired / Lapsed | 1956-11-29 | 1959-11-17 | 0 | Details |
| US2913704A | Multiple emitter matrices | Expired / Lapsed | 1954-07-06 | 1959-11-17 | 0 | Details |
| US2910909A | Colorimeter | Expired / Lapsed | 1957-01-28 | 1959-11-03 | 0 | Details |
| US2903378A | Process of forming luminescent screens | Expired / Lapsed | 1957-12-31 | 1959-09-08 | 2 | Details |
| US2898226A | Image display | Expired / Lapsed | 1957-12-31 | 1959-08-04 | 2 | Details |
| US2898556A | Oscillator | Expired / Lapsed | 1957-05-01 | 1959-08-04 | 0 | Details |
| US2892100A | Power transistor switching circuits | Expired / Lapsed | 1955-08-03 | 1959-06-23 | 0 | Details |
| US2891203A | Silicon rectifiers | Expired / Lapsed | 1954-03-23 | 1959-06-16 | 2 | Details |
| US2884571A | Printed circuit | Expired / Lapsed | 1952-07-12 | 1959-04-28 | 0 | Details |
| US2874308A | Electroluminescent device | Expired / Lapsed | 1956-07-02 | 1959-02-17 | 1 | Details |
| US2872621A | Adding and subtracting drive circuit for counting tubes | Expired / Lapsed | 1956-09-27 | 1959-02-03 | 0 | Details |
| US2869040A | Solder-dipped stamped wiring | Expired / Lapsed | 1954-01-11 | 1959-01-13 | 0 | Details |
| US2863131A | Tube socket | Expired / Lapsed | 1955-01-03 | 1958-12-02 | 0 | Details |
| US2844798A | Carrier suppressed modulator | Expired / Lapsed | 1954-12-14 | 1958-07-22 | 0 | Details |
| US2842764A | Collision warning radar | Expired / Lapsed | 1951-02-21 | 1958-07-08 | 0 | Details |
| US2833986A | Characteristic curve tracer | Expired / Lapsed | 1952-07-21 | 1958-05-06 | 0 | Details |
| US2832928A | Voltage regulator for pulse forming network | Expired / Lapsed | 1953-07-17 | 1958-04-29 | 0 | Details |
| US2825822A | Transistor switching circuits | Expired / Lapsed | 1955-08-03 | 1958-03-04 | 0 | Details |
| US2824992A | Electroluminescent lamp | Expired / Lapsed | 1955-01-17 | 1958-02-25 | 2 | Details |
| US2822518A | Testing circuit | Expired / Lapsed | 1956-11-21 | 1958-02-04 | 0 | Details |
| US2822498A | Tube construction for automatic production | Expired / Lapsed | 1954-04-19 | 1958-02-04 | 0 | Details |
| US2818381A | Coating filamentary material | Expired / Lapsed | 1955-04-18 | 1957-12-31 | 2 | Details |
| US2818531A | Electroluminescent image device | Expired / Lapsed | 1954-06-24 | 1957-12-31 | 2 | Details |
| US2817783A | Electroluminescent device | Expired / Lapsed | 1955-07-13 | 1957-12-24 | 2 | Details |
| US2811472A | Black grid wire coating, and a method and device for produc… | Expired / Lapsed | 1953-10-12 | 1957-10-29 | 1 | Details |
| US2809136A | Apparatus and method of preparing crystals of silicon germa… | Expired / Lapsed | 1954-03-10 | 1957-10-08 | 2 | Details |
| US2809239A | Transistor circuits | Expired / Lapsed | 1953-09-18 | 1957-10-08 | 0 | Details |
| US2809135A | Method of forming p-n junctions in semiconductor material a… | Expired / Lapsed | 1952-07-22 | 1957-10-08 | 2 | Details |
| US2799814A | Germanium photodiode | Expired / Lapsed | 1953-09-01 | 1957-07-16 | 2 | Details |
| US2798189A | Stabilized semiconductor devices | Expired / Lapsed | 1953-04-16 | 1957-07-02 | 0 | Details |
| US2794952A | Within limits frequency response tester | Expired / Lapsed | 1953-09-30 | 1957-06-04 | 0 | Details |
| US2792810A | Article handling device | Expired / Lapsed | 1954-03-01 | 1957-05-21 | 0 | Details |
| US2793145A | Method of forming a junction transistor | Expired / Lapsed | 1952-06-13 | 1957-05-21 | 2 | Details |
| US2788299A | Method of forming junction transistors | Expired / Lapsed | 1954-03-10 | 1957-04-09 | 0 | Details |
| US2777059A | Echo suppression beacons | Expired / Lapsed | 1951-04-13 | 1957-01-08 | 0 | Details |
| US2776391A | Induction lamp | Expired / Lapsed | 1955-12-30 | 1957-01-01 | 0 | Details |
| US2773925A | Electrical translator and methods | Expired / Lapsed | 1951-03-10 | 1956-12-11 | 2 | Details |
| US2773216A | Animated display device | Expired / Lapsed | 1953-01-09 | 1956-12-04 | 0 | Details |
| US2765516A | Semiconductor translators | Expired / Lapsed | 1951-10-20 | 1956-10-09 | 0 | Details |
| US2762967A | Magnetic limiter | Expired / Lapsed | 1953-03-02 | 1956-09-11 | 0 | Details |
| US2762956A | Semi-conductor devices and methods | Expired / Lapsed | 1952-07-19 | 1956-09-11 | 0 | Details |
| US2762953A | Contact rectifiers and methods | Expired / Lapsed | 1951-05-15 | 1956-09-11 | 1 | Details |
| US2744372A | Article handling device | Expired / Lapsed | 1955-08-02 | 1956-05-08 | 0 | Details |
| US2741750A | Socket type connector | Expired / Lapsed | 1952-03-20 | 1956-04-10 | 0 | Details |
| US2740699A | Surface processing | Expired / Lapsed | 1953-04-27 | 1956-04-03 | 2 | Details |
| US2730696A | Pulse time modulated system | Expired / Lapsed | 1951-05-10 | 1956-01-10 | 0 | Details |
| US2728870A | Electroluminescent lamp | Expired / Lapsed | 1952-09-20 | 1955-12-27 | 2 | Details |
| US2721373A | Automatic lead wire threading apparatus | Expired / Lapsed | 1948-11-17 | 1955-10-25 | 0 | Details |
| US2713117A | Heterodyne converter | Expired / Lapsed | 1949-06-18 | 1955-07-12 | 0 | Details |
| US2699594A | Method of assembling semiconductor units | Expired / Lapsed | 1952-02-27 | 1955-01-18 | 0 | Details |
| US2698501A | Apparatus for bending linear glass tubing | Expired / Lapsed | 1950-12-13 | 1955-01-04 | 0 | Details |
| US2693584A | Electrical component assembly | Expired / Lapsed | 1953-08-18 | 1954-11-02 | 0 | Details |
| US2686885A | Insulated coated grid for electron discharge devices | Expired / Lapsed | 1949-11-26 | 1954-08-17 | 0 | Details |
| US2684450A | Electroluminescent lamp | Expired / Lapsed | 1949-07-20 | 1954-07-20 | 0 | Details |
| US2679615A | Electron discharge device | Expired / Lapsed | 1946-12-31 | 1954-05-25 | 0 | Details |
| US2677793A | Crystal amplifier | Expired / Lapsed | 1948-07-20 | 1954-05-04 | 0 | Details |
| US2673311A | Crystal amplifier | Expired / Lapsed | 1948-07-24 | 1954-03-23 | 0 | Details |
| US2672712A | Dummy feed for stem machines | Expired / Lapsed | 1947-08-08 | 1954-03-23 | 0 | Details |
| US2669774A | Mount tray | Expired / Lapsed | 1949-10-05 | 1954-02-23 | 0 | Details |
| US2646609A | Crystal amplifier | Expired / Lapsed | 1948-07-19 | 1953-07-28 | 0 | Details |
| US2641675A | Printed electrical conductor | Expired / Lapsed | 1950-01-17 | 1953-06-09 | 0 | Details |
| US2633526A | Electrical circuit apparatus | Expired / Lapsed | 1949-05-13 | 1953-03-31 | 0 | Details |
| US2630560A | Radio-frequency transformer | Expired / Lapsed | 1949-04-05 | 1953-03-03 | 0 | Details |
| US2626985A | Electrical crystal unit | Expired / Lapsed | 1948-08-25 | 1953-01-27 | 2 | Details |
| US2615965A | Crystal amplifier device | Expired / Lapsed | 1948-07-24 | 1952-10-28 | 0 | Details |
| US2611102A | Traveling wave tube | Expired / Lapsed | 1948-11-13 | 1952-09-16 | 0 | Details |
| US2595052A | Crystal amplifier | Expired / Lapsed | 1948-07-23 | 1952-04-29 | 0 | Details |
| US2586609A | Point-contact electrical device | Expired / Lapsed | 1950-05-27 | 1952-02-19 | 0 | Details |
| US2584597A | Traveling wave tube | Expired / Lapsed | 1949-01-26 | 1952-02-05 | 0 | Details |
| US2575448A | Electron discharge device | Expired / Lapsed | 1945-08-22 | 1951-11-20 | 0 | Details |
| US2570716A | Signal transmission network | Expired / Lapsed | 1948-11-27 | 1951-10-09 | 0 | Details |
| US2566349A | Electroluminescent lamp | Expired / Lapsed | 1950-01-28 | 1951-09-04 | 0 | Details |
| US2555877A | Glass-to-metal seal | Expired / Lapsed | 1945-07-20 | 1951-06-05 | 0 | Details |
| US2547869A | Fluorescent lamp electrode | Expired / Lapsed | 1947-10-31 | 1951-04-03 | 0 | Details |
| US2545271A | Glass coiling machine | Expired / Lapsed | 1942-05-28 | 1951-03-13 | 0 | Details |
| US2542122A | Luminescent materials and method of manufacture | Expired / Lapsed | 1945-08-13 | 1951-02-20 | 2 | Details |
| US2524268A | Ultra high frequency resonator | Expired / Lapsed | 1946-01-11 | 1950-10-03 | 0 | Details |
| US2523840A | Fluorescent lighting fixture | Expired / Lapsed | 1945-01-29 | 1950-09-26 | 0 | Details |
| US2517031A | Flash producing apparatus | Expired / Lapsed | 1946-03-02 | 1950-08-01 | 0 | Details |
| US2502855A | Preoxidation of stainless steel | Expired / Lapsed | 1944-10-18 | 1950-04-04 | 0 | Details |
| US2499854A | Sealing method | Expired / Lapsed | 1947-09-08 | 1950-03-07 | 0 | Details |
| US2486025A | Rectifier tube and circuit | Expired / Lapsed | 1945-09-12 | 1949-10-25 | 0 | Details |
| US2476066A | Crystal matrix | Expired / Lapsed | 1948-05-06 | 1949-07-12 | 0 | Details |
| US2473582A | Carton for radio tubes and the like | Expired / Lapsed | 1946-06-18 | 1949-06-21 | 0 | Details |
| US2472767A | Electron tube grid structure | Expired / Lapsed | 1947-03-19 | 1949-06-07 | 0 | Details |
| US2472747A | Base shield | Expired / Lapsed | 1946-12-17 | 1949-06-07 | 0 | Details |
| US2472770A | Resistance apparatus for converting mechanical movement int… | Expired / Lapsed | 1945-11-20 | 1949-06-07 | 0 | Details |
| US2472760A | Electrode for electron discharge devices | Expired / Lapsed | 1943-12-30 | 1949-06-07 | 0 | Details |
| US2470219A | Linear response vacuum tube voltmeter | Expired / Lapsed | 1944-03-07 | 1949-05-17 | 0 | Details |
| US2457781A | Ray counter | Expired / Lapsed | 1948-01-02 | 1948-12-28 | 0 | Details |
| US2457734A | Resistor for electric discharge devices | Expired / Lapsed | 1947-02-01 | 1948-12-28 | 0 | Details |
| US2457695A | Ultra high frequency apparatus for inspection of sheet and … | Expired / Lapsed | 1945-09-24 | 1948-12-28 | 0 | Details |
| US2457495A | Ultra high frequency tube | Expired / Lapsed | 1944-12-18 | 1948-12-28 | 0 | Details |
| US2450192A | Ultra high frequency tuning unit | Expired / Lapsed | 1943-06-19 | 1948-09-28 | 0 | Details |
| US2444408A | Electric gaseous discharge lamp circuit | Expired / Lapsed | 1946-08-06 | 1948-06-29 | 0 | Details |
| US2432466A | Interdigital magnetron | Expired / Lapsed | 1946-11-29 | 1947-12-09 | 0 | Details |
| US2431656A | Fluorescent lighting fixture | Expired / Lapsed | 1944-10-13 | 1947-11-25 | 0 | Details |
| US2422628A | Glass to metal seal | Expired / Lapsed | 1943-06-12 | 1947-06-17 | 0 | Details |
| US2412751A | Electrical protective device | Expired / Lapsed | 1943-07-22 | 1946-12-17 | 0 | Details |
| US2399661A | Phase comparison apparatus | Expired / Lapsed | 1943-05-26 | 1946-05-07 | 0 | Details |
| US2394892A | Electronic phase bridge | Expired / Lapsed | 1943-07-16 | 1946-02-12 | 0 | Details |
| US2392785A | Lamp base | Expired / Lapsed | 1945-03-28 | 1946-01-08 | 0 | Details |
| US2369146A | Metal insert for vacuum-tight sealing | Expired / Lapsed | 1940-09-26 | 1945-02-13 | 0 | Details |
| US2355258A | Ultraviolet fluorescent lamp | Expired / Lapsed | 1941-05-13 | 1944-08-08 | 0 | Details |
| US2338077A | Fluorescent lamp fixture | Expired / Lapsed | 1941-12-23 | 1943-12-28 | 0 | Details |
| US2337528A | Tube holding apparatus | Expired / Lapsed | 1941-10-25 | 1943-12-21 | 0 | Details |
| US2329164A | Mandrel drive apparatus | Expired / Lapsed | 1941-04-25 | 1943-09-07 | 0 | Details |
| US2329024A | Cathode coating machine | Expired / Lapsed | 1940-11-23 | 1943-09-07 | 0 | Details |
| US2324455A | Lamp coating apparatus | Expired / Lapsed | 1942-02-28 | 1943-07-13 | 0 | Details |
| US2301254A | Stereoscopic method and apparatus | Expired / Lapsed | 1938-07-07 | 1942-11-10 | 0 | Details |