STC PLC
STC PLCActive Patents
0
Total Holdings
248
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| GB2106736A | Optical transmission system | Expired / Lapsed | 1981-09-03 | — | 20 | Details |
| GB2050117A | Alarm device | Expired / Lapsed | 1979-04-10 | — | 8 | Details |
| GB2030423A | Repertory dialler | Expired / Lapsed | 1978-09-19 | — | 10 | Details |
| GB1540907A | System for obtaining data from a plurality of condition res… | Expired / Lapsed | 1976-12-07 | — | 0 | Details |
| GB1117579A | Manufacture of integrated circuits | Expired / Lapsed | 1967-06-09 | — | 0 | Details |
| GB1055418A | Improvements in or relating to electro-mechanical transduce… | Expired / Lapsed | 1964-11-12 | — | 0 | Details |
| GB1021047A | Sealed-contact assemblies for light current electromagnetic… | Expired / Lapsed | 1963-05-13 | — | 0 | Details |
| GB888983A | An arrangement for transmission of information without erro… | Expired / Lapsed | 1960-10-21 | — | 0 | Details |
| GB814158A | Multiplex transmission systems | Expired / Lapsed | 1957-07-12 | — | 0 | Details |
| GB886287A | Voltage or current-sensitive controlling device | Expired / Lapsed | 1957-06-20 | — | 0 | Details |
| GB822297A | Improvements in or relating to electrical switching circuits | Expired / Lapsed | 1956-06-05 | — | 0 | Details |
| GB779046A | Improvements in or relating to electric attenuation measuri… | Expired / Lapsed | 1955-11-01 | — | 0 | Details |
| GB792294A | Improvements in or relating to intelligence storage equipme… | Expired / Lapsed | 1954-12-31 | — | 0 | Details |
| GB724478A | Compressed frequency communication system | Expired / Lapsed | 1953-05-04 | — | 0 | Details |
| GB748336A | Improvements in or relating to information handling equipme… | Expired / Lapsed | 1952-03-06 | — | 0 | Details |
| GB738575A | Improvements in or relating to printed circuits | Expired / Lapsed | 1951-12-21 | — | 0 | Details |
| GB668196A | Improvements in or relating to moisture measuring and contr… | Expired / Lapsed | 1949-07-20 | — | 0 | Details |
| GB629260A | Improvements in or relating to electric signalling or contr… | Expired / Lapsed | 1946-06-21 | — | 0 | Details |
| GB612362A | Improvements in or relating to electric fault alarm circuits | Expired / Lapsed | 1946-05-21 | — | 0 | Details |
| GB571840A | Frequency modulation system | Expired / Lapsed | 1944-02-11 | — | 0 | Details |
| GB567731A | Improvements in or relating to heating materials by high fr… | Expired / Lapsed | 1943-07-26 | — | 0 | Details |
| GB582177A | Multiplex high frequency electrical pulse signalling systems | Expired / Lapsed | 1943-04-07 | — | 0 | Details |
| GB582198A | Improvements in or relating to multiplex high frequency ele… | Expired / Lapsed | 1943-04-07 | — | 0 | Details |
| GB585988A | Improvements relating to radio-echo systems for measuring r… | Expired / Lapsed | 1941-10-10 | — | 0 | Details |
| GB578041A | Improvements in or relating to electrically operated calcul… | Expired / Lapsed | 1941-05-10 | — | 0 | Details |
| GB540233A | Electrical signalling systems | Expired / Lapsed | 1940-05-07 | — | 0 | Details |
| GB538382A | Improvements in and relating to distributors or commutators… | Expired / Lapsed | 1940-01-30 | — | 0 | Details |
| GB525330A | Improvements in or relating to electrically operated calcul… | Expired / Lapsed | 1938-11-21 | — | 0 | Details |
| GB363403A | Distributors for telegraphy or the like | Expired / Lapsed | 1930-09-18 | — | 0 | Details |
| GB357532A | Electric circuits employing thermionic valves or the like | Expired / Lapsed | 1930-06-12 | — | 0 | Details |
| GB348543A | An improved distributor for use in telegraphy or the like | Expired / Lapsed | 1930-02-12 | — | 0 | Details |
| GB344444A | An improved distributor for use in telegraphy or the like | Expired / Lapsed | 1929-11-27 | — | 0 | Details |
| US4630109A | Vehicle tracking system | Expired / Lapsed | 1985-02-28 | 1986-12-16 | 7 | Details |
| US4533247A | Optical transmission system | Expired / Lapsed | 1982-08-23 | 1985-08-06 | 17 | Details |
| US4238850A | Transmitter/receiver for single channel duplex communicatio… | Expired / Lapsed | 1978-11-29 | 1980-12-09 | 5 | Details |
| US4166946A | Data transmission system | Expired / Lapsed | 1977-06-08 | 1979-09-04 | 12 | Details |
| US3943489A | Electrical control systems | Expired / Lapsed | 1974-09-05 | 1976-03-09 | 6 | Details |
| US3579191A | Network using adaptive elements | Expired / Lapsed | 1967-10-27 | 1971-05-18 | 12 | Details |
| US3444318A | Apparatus for processing television signals | Expired / Lapsed | 1966-04-20 | 1969-05-13 | 0 | Details |
| US2688656A | Means for checking recorded information | Expired / Lapsed | 1950-11-24 | 1954-09-07 | 0 | Details |
| US2643329A | Tracking system between receiver and transmitter | Expired / Lapsed | 1945-05-14 | 1953-06-23 | 0 | Details |
| US2641688A | Radio echo pulse system for vehicles following a fixed route | Expired / Lapsed | 1946-02-27 | 1953-06-09 | 0 | Details |
| US2636113A | Fixed route vehicular location and communicating system | Expired / Lapsed | 1946-03-09 | 1953-04-21 | 0 | Details |
| US2607035A | Pulse multiplex transmission system | Expired / Lapsed | 1949-12-19 | 1952-08-12 | 0 | Details |
| US2579470A | Selector system | Expired / Lapsed | 1946-09-07 | 1951-12-25 | 0 | Details |
| US2565504A | Pulse modulated carrier receiver system | Expired / Lapsed | 1950-02-04 | 1951-08-28 | 0 | Details |
| US2561345A | Position recording system | Expired / Lapsed | 1945-04-09 | 1951-07-24 | 0 | Details |
| US2557964A | Error detector for telegraph printers | Expired / Lapsed | 1946-08-17 | 1951-06-26 | 0 | Details |
| US2557994A | Object detector | Expired / Lapsed | 1945-10-12 | 1951-06-26 | 0 | Details |
| US2557951A | Antenna system | Expired / Lapsed | 1945-06-19 | 1951-06-26 | 0 | Details |
| US2549826A | Multiplex electrical pulse communication system | Expired / Lapsed | 1945-12-04 | 1951-04-24 | 0 | Details |
| US2549782A | Voltage regulator | Expired / Lapsed | 1945-08-06 | 1951-04-24 | 0 | Details |
| US2547001A | Drop channel pulse multiplex system | Expired / Lapsed | 1944-01-26 | 1951-04-03 | 0 | Details |
| US2541076A | Multichannel pulse communicating system | Expired / Lapsed | 1944-08-07 | 1951-02-13 | 0 | Details |
| US2535038A | Position indicator system | Expired / Lapsed | 1946-01-26 | 1950-12-26 | 0 | Details |
| US2535048A | Communication and radio guidance system | Expired / Lapsed | 1945-12-15 | 1950-12-26 | 0 | Details |
| US2528541A | Electron discharge device | Expired / Lapsed | 1945-11-01 | 1950-11-07 | 0 | Details |
| US2527565A | Pretimed electrically operated program controller | Expired / Lapsed | 1945-12-29 | 1950-10-31 | 0 | Details |
| US2526152A | Automatic position control apparatus | Expired / Lapsed | 1944-07-28 | 1950-10-17 | 0 | Details |
| US2523300A | Printer telegraph circuit | Expired / Lapsed | 1946-08-17 | 1950-09-26 | 0 | Details |
| US2521721A | Two-way communication system | Expired / Lapsed | 1946-12-13 | 1950-09-12 | 0 | Details |
| US2520170A | Pulse responsive circuit | Expired / Lapsed | 1945-11-14 | 1950-08-29 | 0 | Details |
| US2520132A | Electronic line finder system | Expired / Lapsed | 1945-11-14 | 1950-08-29 | 0 | Details |
| US2517559A | Presettable impulse register | Expired / Lapsed | 1946-03-02 | 1950-08-08 | 0 | Details |
| US2517540A | Distance measuring system | Expired / Lapsed | 1945-08-11 | 1950-08-08 | 0 | Details |
| US2516841A | Grid for electron discharge devices | Expired / Lapsed | 1946-01-16 | 1950-08-01 | 0 | Details |
| US2516886A | Cathode-ray tube modulator | Expired / Lapsed | 1945-09-11 | 1950-08-01 | 0 | Details |
| US2513308A | Electrical time modulated pulse communication system | Expired / Lapsed | 1945-09-01 | 1950-07-04 | 0 | Details |
| US2510066A | Vehicle communication system | Expired / Lapsed | 1946-01-16 | 1950-06-06 | 0 | Details |
| US2510121A | Pulse modulation sound recording system | Expired / Lapsed | 1945-04-17 | 1950-06-06 | 0 | Details |
| US2509218A | Repeater link system | Expired / Lapsed | 1944-04-20 | 1950-05-30 | 0 | Details |
| US2504975A | Radio pulse type distance measuring system | Expired / Lapsed | 1944-03-13 | 1950-04-25 | 0 | Details |
| US2502454A | Method and means for improving signal to noise ratio of sel… | Expired / Lapsed | 1944-12-27 | 1950-04-04 | 0 | Details |
| US2498659A | Automatic volume control system | Expired / Lapsed | 1946-02-09 | 1950-02-28 | 0 | Details |
| US2498649A | Telautograph control system | Expired / Lapsed | 1946-01-24 | 1950-02-28 | 0 | Details |
| US2498676A | Calibration apparatus for radio receiver | Expired / Lapsed | 1945-04-09 | 1950-02-28 | 0 | Details |
| US2495740A | Magnetostrictive time-delay device | Expired / Lapsed | 1945-07-09 | 1950-01-31 | 0 | Details |
| US2495739A | Selectable band width electrical pulse multichannel communi… | Expired / Lapsed | 1945-04-02 | 1950-01-31 | 0 | Details |
| US2492182A | Approach alarm system | Expired / Lapsed | 1946-04-12 | 1949-12-27 | 0 | Details |
| US2492344A | Line finder control circuit for communication systems | Expired / Lapsed | 1945-11-14 | 1949-12-27 | 0 | Details |
| US2489297A | Electronic pulse filtering system | Expired / Lapsed | 1943-05-24 | 1949-11-29 | 0 | Details |
| US2485593A | Rectifier and method of making the same | Expired / Lapsed | 1947-01-03 | 1949-10-25 | 0 | Details |
| US2485591A | Pulse time division multiplex system | Expired / Lapsed | 1945-10-30 | 1949-10-25 | 0 | Details |
| US2485582A | Receiver system | Expired / Lapsed | 1945-06-11 | 1949-10-25 | 0 | Details |
| US2483411A | Pulse synthesizing system | Expired / Lapsed | 1945-12-19 | 1949-10-04 | 0 | Details |
| US2480115A | Radio control system | Expired / Lapsed | 1946-11-30 | 1949-08-30 | 0 | Details |
| US2480123A | Aircraft flight indicating system | Expired / Lapsed | 1945-12-15 | 1949-08-30 | 0 | Details |
| US2480160A | Signaling system | Expired / Lapsed | 1945-06-27 | 1949-08-30 | 0 | Details |
| US2477585A | Pulse shape modifying circuit | Expired / Lapsed | 1945-10-10 | 1949-08-02 | 0 | Details |
| US2474260A | Dielectric measuring apparatus and method | Expired / Lapsed | 1947-01-11 | 1949-06-28 | 0 | Details |
| US2474269A | Power supply regulator system | Expired / Lapsed | 1946-01-25 | 1949-06-28 | 0 | Details |
| US2474263A | Cathode support | Expired / Lapsed | 1945-11-01 | 1949-06-28 | 0 | Details |
| US2474268A | Radio-frequency in-phase indicator | Expired / Lapsed | 1945-07-03 | 1949-06-28 | 0 | Details |
| US2474241A | Piezoelectric crystal structure | Expired / Lapsed | 1945-06-29 | 1949-06-28 | 0 | Details |
| US2474244A | Amplitude modulated time modulated pulse system | Expired / Lapsed | 1944-05-19 | 1949-06-28 | 0 | Details |
| US2474219A | Pulse generating system | Expired / Lapsed | 1942-09-14 | 1949-06-28 | 0 | Details |
| US2471408A | Radio obstacle detection apparatus | Expired / Lapsed | 1942-10-08 | 1949-05-31 | 0 | Details |
| US2468059A | Pulse time modulated multiplex system | Expired / Lapsed | 1945-10-30 | 1949-04-26 | 0 | Details |
| US2468058A | Blocking system for multichannel operation | Expired / Lapsed | 1943-11-23 | 1949-04-26 | 0 | Details |
| US2465354A | Oscillograph | Expired / Lapsed | 1946-03-16 | 1949-03-29 | 0 | Details |
| US2465371A | Color television | Expired / Lapsed | 1945-01-13 | 1949-03-29 | 0 | Details |
| US2465380A | Cathode-ray tube pulse separation and demodulation system | Expired / Lapsed | 1944-11-25 | 1949-03-29 | 0 | Details |
| US2462911A | Rectifier | Expired / Lapsed | 1945-10-20 | 1949-03-01 | 0 | Details |
| US2463476A | Radio navigation system | Expired / Lapsed | 1945-09-26 | 1949-03-01 | 0 | Details |
| US2462849A | Push-pull system | Expired / Lapsed | 1945-08-04 | 1949-03-01 | 0 | Details |
| US2462860A | Pulse translator | Expired / Lapsed | 1945-03-19 | 1949-03-01 | 0 | Details |
| US2459798A | Signal translator blocking circuit | Expired / Lapsed | 1944-03-03 | 1949-01-25 | 0 | Details |
| US2457138A | Rectifier | Expired / Lapsed | 1947-07-22 | 1948-12-28 | 0 | Details |
| US2457173A | Electronic switching system | Expired / Lapsed | 1945-02-23 | 1948-12-28 | 0 | Details |
| US2457140A | Voltage control circuit | Expired / Lapsed | 1944-10-09 | 1948-12-28 | 0 | Details |
| US2457176A | Wave generating system | Expired / Lapsed | 1943-01-23 | 1948-12-28 | 0 | Details |
| US2454792A | Pulse multiplex communication system | Expired / Lapsed | 1944-08-19 | 1948-11-30 | 0 | Details |
| US2454838A | Plug assembly | Expired / Lapsed | 1943-04-24 | 1948-11-30 | 0 | Details |
| US2454772A | Pulse echo system for distance measuring | Expired / Lapsed | 1942-12-10 | 1948-11-30 | 0 | Details |
| US2454782A | Adjustable expanded sweep for radar oscilloscopes | Expired / Lapsed | 1942-12-08 | 1948-11-30 | 0 | Details |
| US2452624A | Apparatus for testing insulation of electrical cables | Expired / Lapsed | 1945-06-11 | 1948-11-02 | 0 | Details |
| US2452563A | Circuits for repeating square shaped wave forms | Expired / Lapsed | 1945-01-11 | 1948-11-02 | 0 | Details |
| US2452590A | Electric signaling system | Expired / Lapsed | 1945-01-08 | 1948-11-02 | 0 | Details |
| US2452589A | Electric remote control and indication system | Expired / Lapsed | 1944-01-14 | 1948-11-02 | 0 | Details |
| US2449977A | Location indicating system | Expired / Lapsed | 1945-06-30 | 1948-09-28 | 0 | Details |
| US2449982A | Radio beacon | Expired / Lapsed | 1944-06-12 | 1948-09-28 | 0 | Details |
| US2450005A | Omnidirectional radio beacon | Expired / Lapsed | 1944-04-26 | 1948-09-28 | 0 | Details |
| US2448055A | Wobbled frequency carrier wave communication system | Expired / Lapsed | 1944-02-21 | 1948-08-31 | 0 | Details |
| US2448034A | Electrical pulse measuring system | Expired / Lapsed | 1943-05-15 | 1948-08-31 | 0 | Details |
| US2447233A | Pulse time modulation multiplex receiver | Expired / Lapsed | 1944-03-15 | 1948-08-17 | 0 | Details |
| US2445800A | Electric frequency counting arrangement | Expired / Lapsed | 1945-11-10 | 1948-07-27 | 0 | Details |
| US2445805A | Enclosed rectifier | Expired / Lapsed | 1945-07-09 | 1948-07-27 | 0 | Details |
| US2445775A | Pulse time modulation multiplex receiver | Expired / Lapsed | 1945-03-05 | 1948-07-27 | 0 | Details |
| US2444439A | Beacon receiver means | Expired / Lapsed | 1945-03-26 | 1948-07-06 | 0 | Details |
| US2444438A | Pulse generation method | Expired / Lapsed | 1944-08-07 | 1948-07-06 | 0 | Details |
| US2444452A | Obstacle detection and communicating system | Expired / Lapsed | 1943-12-11 | 1948-07-06 | 0 | Details |
| US2444426A | Repeater control system | Expired / Lapsed | 1943-10-26 | 1948-07-06 | 0 | Details |
| US2444455A | Static reducing pulse receiver | Expired / Lapsed | 1943-09-09 | 1948-07-06 | 0 | Details |
| US2444425A | Antenna array | Expired / Lapsed | 1943-08-09 | 1948-07-06 | 0 | Details |
| US2444042A | Electrically operated calculating apparatus for converting … | Expired / Lapsed | 1943-07-12 | 1948-06-29 | 0 | Details |
| US2441983A | Modulator | Expired / Lapsed | 1943-12-06 | 1948-05-25 | 0 | Details |
| US2441957A | Demodulator for frequency modulated waves | Expired / Lapsed | 1942-11-13 | 1948-05-25 | 0 | Details |
| US2440253A | Pulse radar interference producer | Expired / Lapsed | 1944-07-04 | 1948-04-27 | 0 | Details |
| US2440245A | Cooling of high-temperature bodies | Expired / Lapsed | 1944-03-13 | 1948-04-27 | 0 | Details |
| US2438928A | Cathode-ray tube pulse demodulator system | Expired / Lapsed | 1944-11-13 | 1948-04-06 | 0 | Details |
| US2438910A | Pulse generator | Expired / Lapsed | 1943-12-20 | 1948-04-06 | 0 | Details |
| US2438902A | Pulse multiplex system employing fixed pulse-time displacem… | Expired / Lapsed | 1943-10-04 | 1948-04-06 | 0 | Details |
| US2438956A | High-frequency cable | Expired / Lapsed | 1942-12-24 | 1948-04-06 | 0 | Details |
| US2438904A | Timing system | Expired / Lapsed | 1942-11-23 | 1948-04-06 | 0 | Details |
| US2436846A | Glide path system for aircraft | Expired / Lapsed | 1942-10-14 | 1948-03-02 | 0 | Details |
| US2436808A | Multivibrator | Expired / Lapsed | 1942-06-02 | 1948-03-02 | 0 | Details |
| US2434921A | Pulse amplitude selective system | Expired / Lapsed | 1944-11-02 | 1948-01-27 | 0 | Details |
| US2434920A | Pulse generator system | Expired / Lapsed | 1943-11-23 | 1948-01-27 | 0 | Details |
| US2434967A | Rectifier and method of making the same | Expired / Lapsed | 1943-10-26 | 1948-01-27 | 0 | Details |
| US2434916A | Trigger operated carrier telegraph transmitter | Expired / Lapsed | 1943-09-08 | 1948-01-27 | 0 | Details |
| US2434965A | Time modulation pulse system | Expired / Lapsed | 1943-08-11 | 1948-01-27 | 0 | Details |
| US2434936A | Modulation system | Expired / Lapsed | 1942-08-24 | 1948-01-27 | 0 | Details |
| US2433341A | Radio navigation system and method | Expired / Lapsed | 1944-05-01 | 1947-12-30 | 0 | Details |
| US2433362A | Pendulum relay controlled startstop telegraph transmitter | Expired / Lapsed | 1943-03-10 | 1947-12-30 | 0 | Details |
| US2433379A | Generation of electrical impulses | Expired / Lapsed | 1942-09-11 | 1947-12-30 | 0 | Details |
| US2431324A | Electrical wave analyzing circuit | Expired / Lapsed | 1944-12-27 | 1947-11-25 | 0 | Details |
| US2429631A | Multichannel pulse modulator system | Expired / Lapsed | 1945-04-30 | 1947-10-28 | 0 | Details |
| US2429616A | Pulse width multichannel system | Expired / Lapsed | 1944-07-29 | 1947-10-28 | 0 | Details |
| US2429613A | Pulse multiplex communication system | Expired / Lapsed | 1943-10-19 | 1947-10-28 | 0 | Details |
| US2429787A | Duplicate transmission | Expired / Lapsed | 1943-04-24 | 1947-10-28 | 0 | Details |
| US2428118A | Pulse multiplex system | Expired / Lapsed | 1944-04-07 | 1947-09-30 | 0 | Details |
| US2428011A | Receiver for time or duration modulated electrical pulses | Expired / Lapsed | 1943-04-21 | 1947-09-30 | 0 | Details |
| US2428038A | Pulse radar system | Expired / Lapsed | 1943-01-08 | 1947-09-30 | 0 | Details |
| US2426989A | Radio detection system | Expired / Lapsed | 1942-12-04 | 1947-09-09 | 0 | Details |
| US2426204A | Discriminator circuits | Expired / Lapsed | 1944-09-11 | 1947-08-26 | 0 | Details |
| US2426225A | Communication system | Expired / Lapsed | 1944-04-20 | 1947-08-26 | 0 | Details |
| US2426176A | Direction finder | Expired / Lapsed | 1943-01-22 | 1947-08-26 | 0 | Details |
| US2426201A | Radio detection system | Expired / Lapsed | 1943-01-04 | 1947-08-26 | 0 | Details |
| US2426217A | Direction and distance indicating system | Expired / Lapsed | 1942-09-14 | 1947-08-26 | 0 | Details |
| US2424972A | Transmitter control circuit | Expired / Lapsed | 1945-04-02 | 1947-08-05 | 0 | Details |
| US2425066A | Pulsed multiplex system employing different width and repet… | Expired / Lapsed | 1945-02-26 | 1947-08-05 | 0 | Details |
| US2425020A | Interference reducing radio system | Expired / Lapsed | 1943-04-16 | 1947-08-05 | 0 | Details |
| US2424984A | Distance and direction radio object detection | Expired / Lapsed | 1942-02-14 | 1947-08-05 | 0 | Details |
| US2423091A | Contact rectifier | Expired / Lapsed | 1942-10-03 | 1947-07-01 | 0 | Details |
| US2421025A | Demodulator system | Expired / Lapsed | 1944-07-29 | 1947-05-27 | 0 | Details |
| US2421018A | Radio detection system | Expired / Lapsed | 1943-02-27 | 1947-05-27 | 0 | Details |
| US2421020A | Detection of obstacles by electromagnetic waves | Expired / Lapsed | 1942-09-09 | 1947-05-27 | 0 | Details |
| US2421016A | Radar testing apparatus | Expired / Lapsed | 1942-05-25 | 1947-05-27 | 0 | Details |
| US2419568A | Transmission system | Expired / Lapsed | 1943-07-16 | 1947-04-29 | 0 | Details |
| US2419571A | Selective pulsing device | Expired / Lapsed | 1943-07-01 | 1947-04-29 | 0 | Details |
| US2419569A | Radio receiver | Expired / Lapsed | 1943-05-24 | 1947-04-29 | 0 | Details |
| US2419570A | Receiver circuit | Expired / Lapsed | 1943-05-24 | 1947-04-29 | 0 | Details |
| US2419548A | Discriminator circuit | Expired / Lapsed | 1943-05-15 | 1947-04-29 | 0 | Details |
| US2419547A | Wave translator | Expired / Lapsed | 1943-04-30 | 1947-04-29 | 0 | Details |
| US2419567A | Radio detection system | Expired / Lapsed | 1943-02-27 | 1947-04-29 | 0 | Details |
| US2419590A | Pulse echo system | Expired / Lapsed | 1943-02-27 | 1947-04-29 | 0 | Details |
| US2419541A | Distance indicating detection system | Expired / Lapsed | 1943-02-20 | 1947-04-29 | 0 | Details |
| US2419525A | Radio beacon | Expired / Lapsed | 1942-10-08 | 1947-04-29 | 0 | Details |
| US2419620A | Obstacle detection apparatus | Expired / Lapsed | 1942-07-24 | 1947-04-29 | 0 | Details |
| US2419546A | Delay circuit | Expired / Lapsed | 1942-03-20 | 1947-04-29 | 0 | Details |
| US2418141A | Battery holder | Expired / Lapsed | 1944-08-28 | 1947-04-01 | 0 | Details |
| US2418116A | Multiplex synchronizing system | Expired / Lapsed | 1943-12-20 | 1947-04-01 | 0 | Details |
| US2418128A | Impulse generator | Expired / Lapsed | 1943-02-13 | 1947-04-01 | 0 | Details |
| US2418112A | Synchronizing system | Expired / Lapsed | 1943-02-13 | 1947-04-01 | 0 | Details |
| US2418127A | Filter system | Expired / Lapsed | 1942-12-01 | 1947-04-01 | 0 | Details |
| US2416330A | Multichannel receiving system | Expired / Lapsed | 1944-08-07 | 1947-02-25 | 0 | Details |
| US2416308A | Radio receiver | Expired / Lapsed | 1943-07-20 | 1947-02-25 | 0 | Details |
| US2416307A | Noise generator | Expired / Lapsed | 1943-01-30 | 1947-02-25 | 0 | Details |
| US2416368A | Method and means for controlling high-frequency oscillators | Expired / Lapsed | 1942-10-06 | 1947-02-25 | 0 | Details |
| US2416305A | Radio receiver | Expired / Lapsed | 1942-09-18 | 1947-02-25 | 0 | Details |
| US2416329A | Push-pull modulation system | Expired / Lapsed | 1942-08-24 | 1947-02-25 | 0 | Details |
| US2416328A | Radio receiver | Expired / Lapsed | 1942-07-03 | 1947-02-25 | 0 | Details |
| US2416327A | Transmitter system | Expired / Lapsed | 1942-06-30 | 1947-02-25 | 0 | Details |
| US2414801A | Rectifier element and stack | Expired / Lapsed | 1942-06-16 | 1947-01-28 | 0 | Details |
| US2414440A | Voice frequency ringer | Expired / Lapsed | 1945-02-21 | 1947-01-21 | 0 | Details |
| US2414471A | High current rectifier | Expired / Lapsed | 1942-03-28 | 1947-01-21 | 0 | Details |
| US2412964A | Secrecy communication system | Expired / Lapsed | 1943-08-28 | 1946-12-24 | 0 | Details |
| US2412995A | Amplifier of electromagnetic energy | Expired / Lapsed | 1942-09-11 | 1946-12-24 | 0 | Details |
| US2412991A | Radio transmission and monitoring system | Expired / Lapsed | 1942-07-17 | 1946-12-24 | 0 | Details |
| US2411540A | Electrically operated calculating equipment | Expired / Lapsed | 1943-07-12 | 1946-11-26 | 0 | Details |
| US2410041A | Piezoelectric crystal cabinet | Expired / Lapsed | 1943-04-01 | 1946-10-29 | 0 | Details |
| US2410060A | Method of producing vacuum tube electrodes | Expired / Lapsed | 1942-03-11 | 1946-10-29 | 0 | Details |
| US2408077A | Multichannel system | Expired / Lapsed | 1944-08-25 | 1946-09-24 | 0 | Details |
| US2408063A | Multiplex receiver | Expired / Lapsed | 1944-07-29 | 1946-09-24 | 0 | Details |
| US2408079A | Pulse discriminator | Expired / Lapsed | 1944-06-19 | 1946-09-24 | 0 | Details |
| US2408052A | Rectifier stack mounting construction | Expired / Lapsed | 1944-05-22 | 1946-09-24 | 0 | Details |
| US2408048A | Radio direction method and system | Expired / Lapsed | 1942-08-28 | 1946-09-24 | 0 | Details |
| US2408078A | Constant width synchronized pulse generator | Expired / Lapsed | 1942-02-03 | 1946-09-24 | 0 | Details |
| US2408061A | Stable pulse generator | Expired / Lapsed | 1941-12-20 | 1946-09-24 | 0 | Details |
| US2407336A | Method and means for transmitting intelligence | Expired / Lapsed | 1943-11-01 | 1946-09-10 | 0 | Details |
| US2406798A | Direction finder | Expired / Lapsed | 1944-01-26 | 1946-09-03 | 0 | Details |
| US2406835A | Method and means for transmitting intelligence | Expired / Lapsed | 1943-08-20 | 1946-09-03 | 0 | Details |
| US2406811A | Facsimile system | Expired / Lapsed | 1942-12-15 | 1946-09-03 | 0 | Details |
| US2406803A | High-frequency electrical communication system | Expired / Lapsed | 1942-12-10 | 1946-09-03 | 0 | Details |
| US2402598A | Modulation control | Expired / Lapsed | 1942-08-19 | 1946-06-25 | 0 | Details |
| US2401384A | Television system | Expired / Lapsed | 1944-07-17 | 1946-06-04 | 0 | Details |
| US2397604A | Electrical indication at a distance | Expired / Lapsed | 1943-06-17 | 1946-04-02 | 0 | Details |
| US2395467A | Multiplex telephone system | Expired / Lapsed | 1943-10-19 | 1946-02-26 | 0 | Details |
| US2394018A | Vacuum tube oscillator | Expired / Lapsed | 1943-04-24 | 1946-02-05 | 0 | Details |
| US2393935A | Joint for electric power cables | Expired / Lapsed | 1942-03-24 | 1946-01-29 | 0 | Details |
| US2383993A | Rectifier and method of making same | Expired / Lapsed | 1943-07-09 | 1945-09-04 | 0 | Details |
| US2383456A | Modulation circuit | Expired / Lapsed | 1943-11-15 | 1945-08-28 | 0 | Details |
| US2383475A | Transformer | Expired / Lapsed | 1942-07-18 | 1945-08-28 | 0 | Details |
| US2372162A | Cable forming apparatus | Expired / Lapsed | 1943-05-15 | 1945-03-20 | 0 | Details |
| US2369662A | Intelligence transmission system | Expired / Lapsed | 1943-06-05 | 1945-02-20 | 0 | Details |
| US2369858A | Cable forming apparatus | Expired / Lapsed | 1943-03-26 | 1945-02-20 | 0 | Details |
| US2369185A | Rectifier | Expired / Lapsed | 1943-11-23 | 1945-02-13 | 0 | Details |
| US2368663A | Broad band antenna | Expired / Lapsed | 1943-05-15 | 1945-02-06 | 0 | Details |
| US2367669A | Cathode structure | Expired / Lapsed | 1942-12-08 | 1945-01-23 | 0 | Details |
| US2365698A | Rectifier and method of making the same | Expired / Lapsed | 1943-10-19 | 1944-12-26 | 0 | Details |
| US2364642A | Method of making selenium elements | Expired / Lapsed | 1943-05-01 | 1944-12-12 | 0 | Details |
| US2364389A | Negative feedback amplifiers | Expired / Lapsed | 1943-11-29 | 1944-12-05 | 0 | Details |
| US2363555A | Method of producing selenium rectifiers | Expired / Lapsed | 1943-08-21 | 1944-11-28 | 0 | Details |
| US2358152A | Phase and frequency modulation system | Expired / Lapsed | 1942-10-02 | 1944-09-12 | 0 | Details |
| US2343284A | Radio equipment and method of assembly | Expired / Lapsed | 1942-07-04 | 1944-03-07 | 0 | Details |
| US2343379A | Waterproof rectifier | Expired / Lapsed | 1942-04-03 | 1944-03-07 | 0 | Details |
| US2321523A | Method of reclaiming selenium elements | Expired / Lapsed | 1942-06-27 | 1943-06-08 | 0 | Details |
| US2307184A | Ultra short wave beacon | Expired / Lapsed | 1939-10-19 | 1943-01-05 | 0 | Details |