EMI Ltd
EMI LtdActive Patents
0
Total Holdings
256
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| GB1515295A | Correlating arrangements | Expired / Lapsed | 1975-10-09 | — | 0 | Details |
| GB1550334A | Radiation detecting arrangements | Expired / Lapsed | 1975-06-28 | — | 0 | Details |
| DE2402481A1 | MAGNETIC STORAGE MEDIUM | Expired / Lapsed | 1974-01-16 | — | 0 | Details |
| GB1427724A | Magnetic recording media | Expired / Lapsed | 1972-03-28 | — | 0 | Details |
| GB1409448A | Automatic target following apparatus | Expired / Lapsed | 1966-04-27 | — | 0 | Details |
| GB919967A | Improvements in or relating to arrangements embodying pick-… | Expired / Lapsed | 1958-06-18 | — | 0 | Details |
| GB807643A | Improvements in or relating to control systems for automati… | Expired / Lapsed | 1954-07-03 | — | 0 | Details |
| GB769305A | Improvements relating to message selection in electrical co… | Expired / Lapsed | 1953-08-06 | — | 0 | Details |
| GB750005A | Improvements relating to radar automatic tracking circuits | Expired / Lapsed | 1953-02-21 | — | 0 | Details |
| GB731650A | Improvements relating to apparatus for converting digital c… | Expired / Lapsed | 1950-01-31 | — | 0 | Details |
| GB677836A | Improvements relating to signalling apparatus | Expired / Lapsed | 1949-02-08 | — | 0 | Details |
| GB685605A | Improvements relating to electron discharge devices employi… | Expired / Lapsed | 1948-12-04 | — | 0 | Details |
| GB650912A | Improvements in or relating to electrical units for radio r… | Expired / Lapsed | 1948-08-19 | — | 0 | Details |
| GB649254A | Improvements in or relating to the manufacture of wiring ci… | Expired / Lapsed | 1947-08-15 | — | 0 | Details |
| GB642825A | Improvements in or relating to scanning aerial equipment fo… | Expired / Lapsed | 1947-01-17 | — | 0 | Details |
| GB444074A | Improvements in or relating to television | Expired / Lapsed | 1934-09-12 | — | 0 | Details |
| GB414187A | Improvements in and relating to wireless and like receivers | Expired / Lapsed | 1933-04-10 | — | 0 | Details |
| GB416574A | Improvements in and relating to electromagnetic vibratory d… | Expired / Lapsed | 1933-02-13 | — | 0 | Details |
| GB404666A | Improvements in magazine talking machines | Expired / Lapsed | 1932-07-15 | — | 0 | Details |
| US4368456A | Apparatus for correlating successive images of a scene | Expired / Lapsed | 1980-01-09 | 1983-01-11 | 8 | Details |
| US4164728A | Correlation techniques | Expired / Lapsed | 1977-12-09 | 1979-08-14 | 10 | Details |
| US4162775A | Tracking and/or guidance systems | Expired / Lapsed | 1976-11-19 | 1979-07-31 | 5 | Details |
| US4132900A | Optical pointer for radiographic apparatus | Expired / Lapsed | 1977-05-12 | 1979-01-02 | 9 | Details |
| US4101768A | Apparatus for computerized tomography having improved anti-… | Expired / Lapsed | 1977-02-28 | 1978-07-18 | 11 | Details |
| US3934142A | Radiography | Expired / Lapsed | 1974-07-17 | 1976-01-20 | 9 | Details |
| US3644739A | Apparatus for detecting positional errors utilizing high-fr… | Expired / Lapsed | 1969-11-28 | 1972-02-22 | 4 | Details |
| US3636563A | Aerial arrangements | Expired / Lapsed | 1969-05-13 | 1972-01-18 | 6 | Details |
| US3587019A | Scanning coils | Expired / Lapsed | 1968-08-22 | 1971-06-22 | 4 | Details |
| US3564257A | Radiation detecting apparatus | Expired / Lapsed | 1962-01-31 | 1971-02-16 | 12 | Details |
| US3390380A | Binary-information analysing arrangements | Expired / Lapsed | 1965-08-18 | 1968-06-25 | 0 | Details |
| US3308335A | Electrostatically focussed electron image tubes | Expired / Lapsed | 1963-03-28 | 1967-03-07 | 2 | Details |
| US3223996A | Radar tracking apparatus | Expired / Lapsed | 1961-12-15 | 1965-12-14 | 2 | Details |
| US3176120A | Automatic control mechanism for machine tools | Expired / Lapsed | 1961-02-21 | 1965-03-30 | 2 | Details |
| US3137788A | Error checking system using residue redundancy | Expired / Lapsed | 1960-11-04 | 1964-06-16 | 2 | Details |
| US3117263A | Automatic position control devices | Expired / Lapsed | 1958-04-29 | 1964-01-07 | 2 | Details |
| US3110802A | Electrical function generators | Expired / Lapsed | 1958-07-31 | 1963-11-12 | 0 | Details |
| US3086154A | Automatic control of machine tools | Expired / Lapsed | 1958-02-27 | 1963-04-16 | 1 | Details |
| US3069658A | Matrix storage devices | Expired / Lapsed | 1957-04-01 | 1962-12-18 | 0 | Details |
| US3026040A | Automatic machine tools | Expired / Lapsed | 1956-10-25 | 1962-03-20 | 0 | Details |
| US3017455A | Pick-up devices for colour television | Expired / Lapsed | 1958-04-07 | 1962-01-16 | 0 | Details |
| US3017454A | Colour television cameras | Expired / Lapsed | 1958-03-18 | 1962-01-16 | 0 | Details |
| US3010656A | Interpolator devices | Expired / Lapsed | 1957-08-02 | 1961-11-28 | 0 | Details |
| US3000562A | Output converters for digital computers | Expired / Lapsed | 1957-09-12 | 1961-09-19 | 0 | Details |
| US3001176A | Message selection in electrical communication or control sy… | Expired / Lapsed | 1954-08-04 | 1961-09-19 | 0 | Details |
| US2996699A | Data-handling apparatus | Expired / Lapsed | 1957-04-01 | 1961-08-15 | 0 | Details |
| US2992774A | Interpolation device for the control of automatic machines | Expired / Lapsed | 1956-08-21 | 1961-07-18 | 0 | Details |
| US2984398A | Apparatus for driving webs | Expired / Lapsed | 1957-12-31 | 1961-05-16 | 0 | Details |
| US2965711A | Apparatus for correcting for transmission variations in tel… | Expired / Lapsed | 1956-11-20 | 1960-12-20 | 0 | Details |
| US2961161A | Control devices for automatic machine tools | Expired / Lapsed | 1957-07-15 | 1960-11-22 | 0 | Details |
| US2939388A | Electrically controlled multiple character printers | Expired / Lapsed | 1957-07-19 | 1960-06-07 | 0 | Details |
| US2929555A | Automatic control mechanism and interpolating devices there… | Expired / Lapsed | 1956-04-27 | 1960-03-22 | 0 | Details |
| US2917693A | Automatic machine tools | Expired / Lapsed | 1955-07-27 | 1959-12-15 | 0 | Details |
| US2916734A | Apparatus for converting digital code signals to analogue s… | Expired / Lapsed | 1955-07-29 | 1959-12-08 | 0 | Details |
| US2906869A | Electrical pulse generator chain circuits and gating circui… | Expired / Lapsed | 1954-02-11 | 1959-09-29 | 0 | Details |
| US2905843A | Electron discharge devices employing photo-conductive targe… | Expired / Lapsed | 1956-02-06 | 1959-09-22 | 0 | Details |
| US2900586A | Displacement error reducing pattern servosystem | Expired / Lapsed | 1957-07-17 | 1959-08-18 | 0 | Details |
| US2894685A | Servo-mechanism function generator utilizing an error volta… | Expired / Lapsed | 1950-09-12 | 1959-07-14 | 0 | Details |
| US2894186A | Automatic tools and other apparatus for shaping workpieces | Expired / Lapsed | 1955-08-22 | 1959-07-07 | 0 | Details |
| US2887638A | Control system for automatic machine tools | Expired / Lapsed | 1955-06-29 | 1959-05-19 | 0 | Details |
| US2883110A | Computing mechanism especially for controlling automatic ma… | Expired / Lapsed | 1956-10-25 | 1959-04-21 | 0 | Details |
| US2869803A | Vehicles | Expired / Lapsed | 1953-03-17 | 1959-01-20 | 0 | Details |
| US2861345A | Displacement measuring devices | Expired / Lapsed | 1955-09-07 | 1958-11-25 | 0 | Details |
| US2857802A | Displacement measuring device using the light pattern from … | Expired / Lapsed | 1955-08-22 | 1958-10-28 | 0 | Details |
| US2854589A | Trigger circuits and shifting registers embodying trigger c… | Expired / Lapsed | 1954-08-10 | 1958-09-30 | 0 | Details |
| US2845691A | Manufacture of grids for electron discharge devices | Expired / Lapsed | 1953-09-09 | 1958-08-05 | 0 | Details |
| US2843773A | Pick-up tube targets | Expired / Lapsed | 1956-08-13 | 1958-07-15 | 0 | Details |
| FR1150870A | Multiple beam cathode ray tubes | Expired / Lapsed | 1956-04-28 | 1958-01-21 | 0 | Details |
| US2819840A | Binary counter and shift register apparatus | Expired / Lapsed | 1952-09-12 | 1958-01-14 | 0 | Details |
| US2808548A | Automatic control systems especially for machine tools | Expired / Lapsed | 1954-10-18 | 1957-10-01 | 0 | Details |
| US2789760A | Electrical computing apparatus | Expired / Lapsed | 1951-01-24 | 1957-04-23 | 0 | Details |
| US2787724A | Electronic storage tubes | Expired / Lapsed | 1953-09-09 | 1957-04-02 | 0 | Details |
| US2785304A | Electronic registers for binary digital computing apparatus | Expired / Lapsed | 1952-09-12 | 1957-03-12 | 0 | Details |
| US2781967A | Computing apparatus | Expired / Lapsed | 1951-01-25 | 1957-02-19 | 0 | Details |
| US2775694A | Electrical circuit arrangements for effecting integration a… | Expired / Lapsed | 1953-06-04 | 1956-12-25 | 0 | Details |
| US2757233A | Electron discharge tube arrangements | Expired / Lapsed | 1951-09-29 | 1956-07-31 | 0 | Details |
| FR1114501A | Improvements to automatic control systems, especially appli… | Expired / Lapsed | 1954-10-28 | 1956-04-13 | 0 | Details |
| US2738379A | Color television apparatus | Expired / Lapsed | 1951-12-19 | 1956-03-13 | 0 | Details |
| US2737730A | Apparatus for generating and reproducing electrical signals | Expired / Lapsed | 1951-02-08 | 1956-03-13 | 0 | Details |
| FR1110544A | Improvements to automatic control systems intended in parti… | Expired / Lapsed | 1954-10-21 | 1956-02-14 | 0 | Details |
| FR1110097A | Improvements to pulse separator circuits | Expired / Lapsed | 1954-10-15 | 1956-02-06 | 0 | Details |
| US2721228A | Colour television apparatus | Expired / Lapsed | 1951-12-19 | 1955-10-18 | 0 | Details |
| US2702259A | Manufacture of electrodes which are sensitized so as to be … | Expired / Lapsed | 1951-08-09 | 1955-02-15 | 0 | Details |
| US2688077A | Method and apparatus for the control of the timing of recur… | Expired / Lapsed | 1946-01-11 | 1954-08-31 | 0 | Details |
| US2683819A | Registers such as are employed in digital computing apparat… | Expired / Lapsed | 1952-05-28 | 1954-07-13 | 0 | Details |
| US2675462A | Illuminating means for television apparatus | Expired / Lapsed | 1950-05-09 | 1954-04-13 | 0 | Details |
| US2662213A | Means for indicating the logarithmic value of a magnitude | Expired / Lapsed | 1951-01-19 | 1953-12-08 | 0 | Details |
| US2661392A | Color television | Expired / Lapsed | 1947-12-13 | 1953-12-01 | 0 | Details |
| US2638504A | High-frequency electrical device having gastight envelopes | Expired / Lapsed | 1946-10-05 | 1953-05-12 | 0 | Details |
| US2622193A | Electronic switching circuits | Expired / Lapsed | 1950-08-28 | 1952-12-16 | 0 | Details |
| US2622147A | Flying spot scanning of continuously moving film | Expired / Lapsed | 1948-09-10 | 1952-12-16 | 0 | Details |
| US2621292A | Electrical integrating circuit arrangement | Expired / Lapsed | 1948-02-10 | 1952-12-09 | 0 | Details |
| US2621246A | Television transmitting controllable marking system | Expired / Lapsed | 1948-01-20 | 1952-12-09 | 0 | Details |
| US2598401A | Electron discharge device suitable for use as television tr… | Expired / Lapsed | 1949-02-16 | 1952-05-27 | 0 | Details |
| US2591919A | Electrical apparatus for detecting the presence of moving o… | Expired / Lapsed | 1946-04-03 | 1952-04-08 | 0 | Details |
| US2586409A | Electrical pulse generating circuits | Expired / Lapsed | 1948-06-01 | 1952-02-19 | 0 | Details |
| US2584882A | Integrating circuits | Expired / Lapsed | 1946-06-05 | 1952-02-05 | 0 | Details |
| US2574356A | Process of making photoelectric cathodes | Expired / Lapsed | 1948-03-01 | 1951-11-06 | 0 | Details |
| US2572792A | Thermionic valve circuits | Expired / Lapsed | 1950-08-23 | 1951-10-23 | 0 | Details |
| US2572644A | Electron discharge tube | Expired / Lapsed | 1948-08-19 | 1951-10-23 | 0 | Details |
| US2567532A | Electrical analogue device | Expired / Lapsed | 1948-09-30 | 1951-09-11 | 0 | Details |
| US2564824A | Circuits for generating electrical impulses | Expired / Lapsed | 1948-02-03 | 1951-08-21 | 0 | Details |
| US2555091A | Cathode-ray tube | Expired / Lapsed | 1949-01-26 | 1951-05-29 | 0 | Details |
| US2551712A | Process of metallizing surfaces | Expired / Lapsed | 1946-12-20 | 1951-05-08 | 2 | Details |
| US2541454A | Control circuits for electrical oscillation generators | Expired / Lapsed | 1948-06-30 | 1951-02-13 | 0 | Details |
| US2536652A | Socket for electrical devices | Expired / Lapsed | 1947-07-31 | 1951-01-02 | 0 | Details |
| US2535471A | Television transmitter switching apparatus | Expired / Lapsed | 1947-02-12 | 1950-12-26 | 0 | Details |
| US2534846A | Color filter | Expired / Lapsed | 1947-09-08 | 1950-12-19 | 0 | Details |
| US2519527A | Electric dry battery | Expired / Lapsed | 1947-03-20 | 1950-08-22 | 2 | Details |
| US2518434A | Electron discharge device such as a television transmitting… | Expired / Lapsed | 1947-10-04 | 1950-08-08 | 0 | Details |
| US2516643A | Electron discharge device including a hollow resonator | Expired / Lapsed | 1946-11-29 | 1950-07-25 | 0 | Details |
| US2506627A | Electron discharge device | Expired / Lapsed | 1946-12-27 | 1950-05-09 | 0 | Details |
| US2501368A | Frequency stabilized relay for frequency-modulated oscillat… | Expired / Lapsed | 1945-03-03 | 1950-03-21 | 0 | Details |
| US2493648A | Electrical pulse separating circuits | Expired / Lapsed | 1945-06-02 | 1950-01-03 | 0 | Details |
| US2492943A | Synchronizing pulse reforming system for television relays | Expired / Lapsed | 1946-04-27 | 1949-12-27 | 0 | Details |
| US2465840A | Electrical network for forming and shaping electrical waves | Expired / Lapsed | 1944-08-30 | 1949-03-29 | 0 | Details |
| US2456666A | Radio direction finding system | Expired / Lapsed | 1943-11-22 | 1948-12-21 | 0 | Details |
| US2456573A | Electrical motor control system | Expired / Lapsed | 1945-12-21 | 1948-12-14 | 0 | Details |
| US2455657A | Circuit arrangement for mixing oscillations | Expired / Lapsed | 1945-04-13 | 1948-12-07 | 0 | Details |
| US2436421A | Flexible wave guide for ultra high frequency energy | Expired / Lapsed | 1943-05-12 | 1948-02-24 | 0 | Details |
| US2433681A | Radio reflection direction and distance determining system | Expired / Lapsed | 1942-06-13 | 1947-12-30 | 0 | Details |
| US2431973A | Line amplifier for high-frequency electric signals such as … | Expired / Lapsed | 1944-03-31 | 1947-12-02 | 0 | Details |
| US2428295A | Thermionic valve amplifier circuit arrangement | Expired / Lapsed | 1944-04-21 | 1947-09-30 | 0 | Details |
| US2425084A | Variable impedance device | Expired / Lapsed | 1945-06-02 | 1947-08-05 | 0 | Details |
| US2424893A | Amplifier circuits | Expired / Lapsed | 1945-08-22 | 1947-07-29 | 0 | Details |
| US2410233A | Method and apparatus for reducing the effect of interference | Expired / Lapsed | 1942-06-13 | 1946-10-29 | 0 | Details |
| US2406316A | Radio pulse system with interference eliminator | Expired / Lapsed | 1942-06-13 | 1946-08-27 | 0 | Details |
| US2405552A | Pulse generating thermionic valve apparatus | Expired / Lapsed | 1942-06-13 | 1946-08-13 | 0 | Details |
| US2373437A | Twin-discharge tube oscillator | Expired / Lapsed | 1942-08-18 | 1945-04-10 | 0 | Details |
| US2358428A | Thermionic valve amplifier circuit arrangement | Expired / Lapsed | 1943-05-15 | 1944-09-19 | 0 | Details |
| US2331723A | Apparatus for generating high frequency oscillations | Expired / Lapsed | 1938-12-01 | 1943-10-12 | 0 | Details |
| US2314648A | Television transmitting and the like system | Expired / Lapsed | 1936-09-10 | 1943-03-23 | 0 | Details |
| US2312977A | Frequency modulation | Expired / Lapsed | 1940-10-03 | 1943-03-02 | 0 | Details |
| US2311021A | Multiplex receiving system | Expired / Lapsed | 1939-07-19 | 1943-02-16 | 0 | Details |
| US2307249A | Television device | Expired / Lapsed | 1941-01-31 | 1943-01-05 | 0 | Details |
| US2307375A | Transmission of electrical signals having a direct current … | Expired / Lapsed | 1939-05-23 | 1943-01-05 | 0 | Details |
| US2305179A | Electron multiplier | Expired / Lapsed | 1939-05-24 | 1942-12-15 | 0 | Details |
| US2303909A | Transmission of electrical signals | Expired / Lapsed | 1939-05-23 | 1942-12-01 | 0 | Details |
| US2303968A | Television system | Expired / Lapsed | 1939-05-10 | 1942-12-01 | 0 | Details |
| US2300996A | Electric oscillation generating circuits | Expired / Lapsed | 1941-02-12 | 1942-11-03 | 0 | Details |
| US2297931A | Modulated high frequency transmitter | Expired / Lapsed | 1940-03-16 | 1942-10-06 | 0 | Details |
| US2295330A | Television or other signal transmission system | Expired / Lapsed | 1939-05-24 | 1942-09-08 | 0 | Details |
| US2293945A | Modulating system | Expired / Lapsed | 1939-12-05 | 1942-08-25 | 0 | Details |
| US2294123A | Magnetic electron lens | Expired / Lapsed | 1939-05-16 | 1942-08-25 | 0 | Details |
| US2289500A | Electron image dissecting arrangement | Expired / Lapsed | 1940-11-22 | 1942-07-14 | 0 | Details |
| US2289000A | Power supply arrangement for variable loads | Expired / Lapsed | 1939-04-27 | 1942-07-07 | 0 | Details |
| US2286450A | Television receiving system | Expired / Lapsed | 1939-07-18 | 1942-06-16 | 0 | Details |
| US2286894A | Circuit arrangement embodying cathode ray oscillographs | Expired / Lapsed | 1939-03-22 | 1942-06-16 | 0 | Details |
| US2284085A | Electric signal transmission system | Expired / Lapsed | 1939-10-26 | 1942-05-26 | 0 | Details |
| US2280990A | Thermionic valve circuits for the generation of saw tooth c… | Expired / Lapsed | 1940-05-15 | 1942-04-28 | 0 | Details |
| US2279555A | Optical image producing and viewing arrangement | Expired / Lapsed | 1938-07-30 | 1942-04-14 | 0 | Details |
| US2277246A | Electron discharge device | Expired / Lapsed | 1938-11-04 | 1942-03-24 | 0 | Details |
| US2275952A | Method of coating insulating materials on metal objects | Expired / Lapsed | 1938-11-22 | 1942-03-10 | 0 | Details |
| US2276152A | Thermionic valve voltmeter and potentiometer circuits and t… | Expired / Lapsed | 1938-11-16 | 1942-03-10 | 0 | Details |
| US2275023A | Thermionic valve circuit arrangement | Expired / Lapsed | 1940-05-09 | 1942-03-03 | 0 | Details |
| US2269001A | Thermionic valve amplifier | Expired / Lapsed | 1940-08-06 | 1942-01-06 | 0 | Details |
| US2268790A | Voltage stabilizing device for electric supply systems | Expired / Lapsed | 1939-05-27 | 1942-01-06 | 0 | Details |
| US2266154A | Thermionic valve circuits | Expired / Lapsed | 1940-03-01 | 1941-12-16 | 0 | Details |
| US2265996A | Thermionic valve circuits | Expired / Lapsed | 1939-04-22 | 1941-12-16 | 0 | Details |
| US2266526A | Electrical oscillation generator | Expired / Lapsed | 1939-04-11 | 1941-12-16 | 0 | Details |
| US2266509A | Electric signal pulse controlling circuits | Expired / Lapsed | 1938-03-08 | 1941-12-16 | 0 | Details |
| US2264540A | Cathode-ray tube | Expired / Lapsed | 1937-09-09 | 1941-12-02 | 0 | Details |
| US2263902A | Delay device for use in transmission of oscillations | Expired / Lapsed | 1939-02-02 | 1941-11-25 | 0 | Details |
| US2263376A | Electric wave filter or the like | Expired / Lapsed | 1939-04-08 | 1941-11-18 | 0 | Details |
| US2262468A | Thermionic valve circuit | Expired / Lapsed | 1939-02-23 | 1941-11-11 | 0 | Details |
| US2258732A | Electric signal pulse controlling circuits | Expired / Lapsed | 1938-12-22 | 1941-10-14 | 0 | Details |
| US2258047A | Wave transmission system | Expired / Lapsed | 1940-03-06 | 1941-10-07 | 0 | Details |
| US2258294A | Photoelectric device | Expired / Lapsed | 1939-01-21 | 1941-10-07 | 0 | Details |
| US2258557A | Television transmitting system | Expired / Lapsed | 1938-01-18 | 1941-10-07 | 0 | Details |
| US2254204A | Television system | Expired / Lapsed | 1937-05-11 | 1941-09-02 | 0 | Details |
| US2254073A | Photoelectrically sensitive surface | Expired / Lapsed | 1939-03-07 | 1941-08-26 | 0 | Details |
| US2254031A | Relaxation oscillation generator | Expired / Lapsed | 1938-11-01 | 1941-08-26 | 0 | Details |
| US2254087A | Electrical oscillation generator | Expired / Lapsed | 1938-10-27 | 1941-08-26 | 0 | Details |
| US2248975A | Electrical oscillation generator | Expired / Lapsed | 1939-02-11 | 1941-07-15 | 0 | Details |
| US2246931A | Method of fabricating connecting leads | Expired / Lapsed | 1939-01-26 | 1941-06-24 | 0 | Details |
| US2244240A | Direct current inserting device | Expired / Lapsed | 1938-12-22 | 1941-06-03 | 0 | Details |
| US2243079A | Television transmitting apparatus | Expired / Lapsed | 1937-11-09 | 1941-05-27 | 0 | Details |
| US2238770A | High frequency electrical conductor or radiator | Expired / Lapsed | 1939-03-04 | 1941-04-15 | 0 | Details |
| US2237671A | Electron discharge device | Expired / Lapsed | 1939-04-08 | 1941-04-08 | 0 | Details |
| US2237681A | Television transmitting tube | Expired / Lapsed | 1938-12-02 | 1941-04-08 | 0 | Details |
| US2234234A | Aerial or aerial system | Expired / Lapsed | 1939-06-15 | 1941-03-11 | 0 | Details |
| US2233596A | Thermionic valve oscillatory circuits | Expired / Lapsed | 1937-07-07 | 1941-03-04 | 0 | Details |
| US2230819A | Thermionic valve circuits | Expired / Lapsed | 1939-08-04 | 1941-02-04 | 0 | Details |
| US2227492A | Television receiving apparatus | Expired / Lapsed | 1937-02-20 | 1941-01-07 | 0 | Details |
| US2227052A | Circuit arrangement for separating electric pulses | Expired / Lapsed | 1939-05-17 | 1940-12-31 | 0 | Details |
| US2227057A | Radio receiver | Expired / Lapsed | 1938-12-07 | 1940-12-31 | 0 | Details |
| US2227056A | Background reinserter | Expired / Lapsed | 1938-11-07 | 1940-12-31 | 0 | Details |
| US2227050A | Television transmitting or receiving system | Expired / Lapsed | 1938-02-12 | 1940-12-31 | 0 | Details |
| US2227197A | Signaling system | Expired / Lapsed | 1936-07-15 | 1940-12-31 | 0 | Details |
| US2225524A | Directional wireless system employing pulses | Expired / Lapsed | 1938-11-16 | 1940-12-17 | 0 | Details |
| US2225033A | Television system | Expired / Lapsed | 1937-04-08 | 1940-12-17 | 0 | Details |
| US2224134A | Transmission of electrical signals having a direct current … | Expired / Lapsed | 1936-03-20 | 1940-12-10 | 0 | Details |
| US2222934A | Television transmitting and receiving system | Expired / Lapsed | 1938-10-12 | 1940-11-26 | 0 | Details |
| US2222933A | Thermionic amplifier | Expired / Lapsed | 1938-05-24 | 1940-11-26 | 0 | Details |
| US2218905A | Wireless and like receiver, and tuning control apparatus fo… | Expired / Lapsed | 1936-01-29 | 1940-10-22 | 0 | Details |
| US2215775A | Radio receiver | Expired / Lapsed | 1938-08-04 | 1940-09-24 | 0 | Details |
| US2214608A | Automatic gain control circuits | Expired / Lapsed | 1936-10-30 | 1940-09-10 | 0 | Details |
| US2212967A | Television and like transmitting system | Expired / Lapsed | 1938-04-16 | 1940-08-27 | 0 | Details |
| US2212923A | Picture transmitter | Expired / Lapsed | 1936-08-12 | 1940-08-27 | 0 | Details |
| US2212558A | Signaling system | Expired / Lapsed | 1936-04-24 | 1940-08-27 | 0 | Details |
| US2211942A | Circuit arrangement for separating electrical signal pulses | Expired / Lapsed | 1938-03-02 | 1940-08-20 | 0 | Details |
| US2212217A | Oscillatory electric circuits | Expired / Lapsed | 1937-08-21 | 1940-08-20 | 0 | Details |
| US2212202A | Electronic oscillation generator | Expired / Lapsed | 1937-02-03 | 1940-08-20 | 0 | Details |
| US2211859A | Electron discharge tube | Expired / Lapsed | 1936-07-09 | 1940-08-20 | 0 | Details |
| US2212199A | Television and the like transmitting system | Expired / Lapsed | 1935-11-19 | 1940-08-20 | 0 | Details |
| US2210523A | Television system | Expired / Lapsed | 1938-03-01 | 1940-08-06 | 0 | Details |
| US2210034A | Electron multipler | Expired / Lapsed | 1936-11-05 | 1940-08-06 | 0 | Details |
| US2203485A | Voltage double circuit | Expired / Lapsed | 1934-03-01 | 1940-06-04 | 0 | Details |
| US2201345A | Thermionic valve repeating arrangement | Expired / Lapsed | 1938-05-07 | 1940-05-21 | 0 | Details |
| US2200039A | Permanent magnet device for producing axially symmetrical m… | Expired / Lapsed | 1938-10-28 | 1940-05-07 | 0 | Details |
| US2199438A | Electron discharge device | Expired / Lapsed | 1937-01-15 | 1940-05-07 | 0 | Details |
| US2195717A | Electrical high frequency signaling system | Expired / Lapsed | 1937-10-30 | 1940-04-02 | 0 | Details |
| US2194551A | Means and method of producing flat surfaces | Expired / Lapsed | 1937-06-11 | 1940-03-26 | 0 | Details |
| US2194169A | Radio and like receiving apparatus | Expired / Lapsed | 1938-04-28 | 1940-03-19 | 0 | Details |
| US2190753A | Apparatus for amplifying electrical variations | Expired / Lapsed | 1935-09-14 | 1940-02-20 | 0 | Details |
| US2187782A | Thermionic tube modulator | Expired / Lapsed | 1936-10-10 | 1940-01-23 | 0 | Details |
| US2186742A | Television and like transmitting system | Expired / Lapsed | 1936-03-05 | 1940-01-09 | 0 | Details |
| US2185363A | Thermionic valve circuits | Expired / Lapsed | 1937-12-08 | 1940-01-02 | 0 | Details |
| US2185367A | Thermionic valve amplifying circuit | Expired / Lapsed | 1937-06-24 | 1940-01-02 | 0 | Details |
| US2185601A | Electronic image indicating device | Expired / Lapsed | 1936-06-05 | 1940-01-02 | 0 | Details |
| US2182578A | Television transmitting system | Expired / Lapsed | 1935-08-02 | 1939-12-05 | 0 | Details |
| US2181850A | Cathode ray tube | Expired / Lapsed | 1937-07-17 | 1939-11-28 | 0 | Details |
| US2178985A | Thermionic valve circuit | Expired / Lapsed | 1935-08-30 | 1939-11-07 | 0 | Details |
| US2178233A | Cathode ray tube | Expired / Lapsed | 1937-06-11 | 1939-10-31 | 0 | Details |
| US2178012A | Thermionic valve circuits | Expired / Lapsed | 1937-04-08 | 1939-10-31 | 0 | Details |
| US2176973A | Cathode ray apparatus | Expired / Lapsed | 1935-06-01 | 1939-10-24 | 0 | Details |
| US2173257A | Cathode ray tube | Expired / Lapsed | 1938-07-30 | 1939-09-19 | 0 | Details |
| US2172354A | Multiplex signaling system | Expired / Lapsed | 1936-11-06 | 1939-09-12 | 0 | Details |
| US2171671A | Thermionic valve circuit | Expired / Lapsed | 1937-05-17 | 1939-09-05 | 0 | Details |
| US2167709A | Wireless aerial system | Expired / Lapsed | 1937-03-15 | 1939-08-01 | 0 | Details |
| US2165961A | High frequency signaling system | Expired / Lapsed | 1936-10-21 | 1939-07-11 | 0 | Details |
| US2165028A | Television and the like system employing cathode ray tubes | Expired / Lapsed | 1935-03-15 | 1939-07-04 | 0 | Details |
| US2160053A | Wireless aerial system | Expired / Lapsed | 1937-02-25 | 1939-05-30 | 0 | Details |
| US2153269A | Cathode ray tube | Expired / Lapsed | 1936-02-25 | 1939-04-04 | 0 | Details |
| US2151785A | Electron discharge device | Expired / Lapsed | 1938-06-25 | 1939-03-28 | 0 | Details |
| US2151145A | Reduction of interference in electric signal transmission s… | Expired / Lapsed | 1937-01-11 | 1939-03-21 | 0 | Details |
| US2143907A | Photoelectric screen for cathode ray tubes | Expired / Lapsed | 1935-10-10 | 1939-01-17 | 0 | Details |
| US2143398A | Television transmission system | Expired / Lapsed | 1936-06-09 | 1939-01-10 | 0 | Details |
| US2140102A | Television or the like transmission system | Expired / Lapsed | 1934-02-12 | 1938-12-13 | 0 | Details |
| US2138928A | Electron discharge device | Expired / Lapsed | 1936-10-09 | 1938-12-06 | 0 | Details |
| US2137262A | Television system | Expired / Lapsed | 1936-01-30 | 1938-11-22 | 0 | Details |
| US2137798A | Television and the like transmission system | Expired / Lapsed | 1934-07-14 | 1938-11-22 | 0 | Details |
| US2134851A | Television and the like systems | Expired / Lapsed | 1935-02-16 | 1938-11-01 | 0 | Details |
| US2125597A | High frequency transmission system | Expired / Lapsed | 1935-04-11 | 1938-08-02 | 0 | Details |
| US2124270A | Cathode ray tube | Expired / Lapsed | 1935-11-05 | 1938-07-19 | 0 | Details |
| US2122974A | Television transmitter | Expired / Lapsed | 1934-03-05 | 1938-07-05 | 0 | Details |
| US2120823A | Coupling means for thermionic valve circuits | Expired / Lapsed | 1936-04-08 | 1938-06-14 | 0 | Details |
| US2115855A | Cathode ray tube | Expired / Lapsed | 1936-10-01 | 1938-05-03 | 0 | Details |
| US2113011A | Thermionic valve apparatus | Expired / Lapsed | 1936-11-28 | 1938-04-05 | 0 | Details |
| US2108523A | Cathode ray tube | Expired / Lapsed | 1936-11-10 | 1938-02-15 | 0 | Details |
| US2100259A | Television | Expired / Lapsed | 1934-05-03 | 1937-11-23 | 0 | Details |
| US2093540A | Sound-transmission, sound-recording, and sound-reproducing … | Expired / Lapsed | 1932-12-13 | 1937-09-21 | 0 | Details |
| US2077442A | Cathode ray tube | Expired / Lapsed | 1933-08-09 | 1937-04-20 | 0 | Details |
| US2070651A | Wireless direction finding system | Expired / Lapsed | 1933-05-24 | 1937-02-16 | 0 | Details |
| US2063025A | Sweep circuit | Expired / Lapsed | 1933-04-01 | 1936-12-08 | 0 | Details |
| US2062275A | Sound-transmission, sound-recording, and sound-reproducing … | Expired / Lapsed | 1934-11-08 | 1936-11-24 | 0 | Details |
| US2039657A | Supersonic heterodyne receiver | Expired / Lapsed | 1934-02-12 | 1936-05-05 | 0 | Details |