EMI Ltd
EMI LtdActive Patents
0
Total Holdings
148
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 |
| GB1427724A | Magnetic recording media | Expired / Lapsed | 1972-03-28 | — | 0 | Details |
| GB769305A | Improvements relating to message selection in electrical co… | Expired / Lapsed | 1953-08-06 | — | 0 | Details |
| GB731650A | Improvements relating to apparatus for converting digital c… | Expired / Lapsed | 1950-01-31 | — | 0 | Details |
| GB649254A | Improvements in or relating to the manufacture of wiring ci… | Expired / Lapsed | 1947-08-15 | — | 0 | Details |
| GB416574A | Improvements in and relating to electromagnetic vibratory d… | Expired / Lapsed | 1933-02-13 | — | 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| US3017455A | Pick-up devices for colour television | Expired / Lapsed | 1958-04-07 | 1962-01-16 | 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 |
| 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 |
| US2929555A | Automatic control mechanism and interpolating devices there… | Expired / Lapsed | 1956-04-27 | 1960-03-22 | 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| US2702259A | Manufacture of electrodes which are sensitized so as to be … | Expired / Lapsed | 1951-08-09 | 1955-02-15 | 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 |
| 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 |
| US2586409A | Electrical pulse generating circuits | Expired / Lapsed | 1948-06-01 | 1952-02-19 | 0 | Details |
| US2572644A | Electron discharge tube | Expired / Lapsed | 1948-08-19 | 1951-10-23 | 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 |
| US2541454A | Control circuits for electrical oscillation generators | Expired / Lapsed | 1948-06-30 | 1951-02-13 | 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 |
| 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 |
| 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 |
| US2405552A | Pulse generating thermionic valve apparatus | Expired / Lapsed | 1942-06-13 | 1946-08-13 | 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 |
| US2303909A | Transmission of electrical signals | Expired / Lapsed | 1939-05-23 | 1942-12-01 | 0 | Details |
| US2300996A | Electric oscillation generating circuits | Expired / Lapsed | 1941-02-12 | 1942-11-03 | 0 | Details |
| US2289500A | Electron image dissecting arrangement | Expired / Lapsed | 1940-11-22 | 1942-07-14 | 0 | Details |
| US2286894A | Circuit arrangement embodying cathode ray oscillographs | Expired / Lapsed | 1939-03-22 | 1942-06-16 | 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| US2227492A | Television receiving apparatus | Expired / Lapsed | 1937-02-20 | 1941-01-07 | 0 | Details |
| US2227057A | Radio receiver | Expired / Lapsed | 1938-12-07 | 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 |
| 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 |
| 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 |
| US2212199A | Television and the like transmitting system | Expired / Lapsed | 1935-11-19 | 1940-08-20 | 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 |
| 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 |
| US2181850A | Cathode ray tube | Expired / Lapsed | 1937-07-17 | 1939-11-28 | 0 | Details |
| US2178233A | Cathode ray tube | Expired / Lapsed | 1937-06-11 | 1939-10-31 | 0 | Details |
| US2173257A | Cathode ray tube | Expired / Lapsed | 1938-07-30 | 1939-09-19 | 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 |
| US2151145A | Reduction of interference in electric signal transmission s… | Expired / Lapsed | 1937-01-11 | 1939-03-21 | 0 | Details |
| US2143398A | Television transmission system | Expired / Lapsed | 1936-06-09 | 1939-01-10 | 0 | Details |
| US2137262A | Television system | Expired / Lapsed | 1936-01-30 | 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 |
| 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 |
| 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 |