Radio Patents Corp
Radio PateActive Patents
0
Total Holdings
73
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2580421A | Cross-talk compensation in pulse multiplex system | Expired / Lapsed | 1945-11-09 | 1952-01-01 | 0 | Details |
| US2522371A | Automatic frequency stabilization system | Expired / Lapsed | 1947-04-12 | 1950-09-12 | 0 | Details |
| US2522367A | Radio distance measuring system | Expired / Lapsed | 1945-07-28 | 1950-09-12 | 0 | Details |
| US2510338A | Means for and method of scrambling speech signals | Expired / Lapsed | 1946-09-05 | 1950-06-06 | 0 | Details |
| US2508672A | Method and arrangement for converting time-modulated pulses… | Expired / Lapsed | 1948-08-07 | 1950-05-23 | 0 | Details |
| US2491810A | Receiving system for phase-keyed pulse signals | Expired / Lapsed | 1946-09-18 | 1949-12-20 | 0 | Details |
| US2481659A | Means for and method of synchronizing alternating electric … | Expired / Lapsed | 1947-09-11 | 1949-09-13 | 0 | Details |
| US2453988A | Automatic frequency control | Expired / Lapsed | 1944-02-26 | 1948-11-16 | 0 | Details |
| US2451823A | Direction finding system | Expired / Lapsed | 1947-12-10 | 1948-10-19 | 0 | Details |
| US2451824A | Means for and method of producing time modulated signal imp… | Expired / Lapsed | 1946-11-22 | 1948-10-19 | 0 | Details |
| US2451822A | Distance and speed indicating system | Expired / Lapsed | 1945-02-15 | 1948-10-19 | 0 | Details |
| US2446390A | Potentiometric amplifier | Expired / Lapsed | 1943-09-28 | 1948-08-03 | 0 | Details |
| US2440486A | Variable frequency continuous balance motor control system | Expired / Lapsed | 1947-06-26 | 1948-04-27 | 0 | Details |
| US2435496A | Impulse modulation system | Expired / Lapsed | 1945-03-13 | 1948-02-03 | 0 | Details |
| US2423616A | Self-balancing translation system | Expired / Lapsed | 1944-02-01 | 1947-07-08 | 0 | Details |
| US2419637A | Synchronizing system | Expired / Lapsed | 1944-09-08 | 1947-04-29 | 0 | Details |
| US2416215A | Translation system for blocking layer photovoltaic cells | Expired / Lapsed | 1944-07-06 | 1947-02-18 | 0 | Details |
| US2405500A | Means for and method of secret signaling | Expired / Lapsed | 1944-02-26 | 1946-08-06 | 0 | Details |
| US2378163A | Combined screen frame and weather stripping | Expired / Lapsed | 1944-03-04 | 1945-06-12 | 0 | Details |
| US2361193A | Control device, particularly thermostatic device | Expired / Lapsed | 1939-07-12 | 1944-10-24 | 0 | Details |
| US2299228A | Electric condenser | Expired / Lapsed | 1939-01-12 | 1942-10-20 | 0 | Details |
| US2274648A | Variable electronic reactance | Expired / Lapsed | 1940-05-02 | 1942-03-03 | 0 | Details |
| US2272235A | Electron tube amplifier | Expired / Lapsed | 1940-05-28 | 1942-02-10 | 0 | Details |
| US2269688A | Electronic modulator | Expired / Lapsed | 1941-02-24 | 1942-01-13 | 0 | Details |
| US2268587A | Distance determining system | Expired / Lapsed | 1940-03-06 | 1942-01-06 | 0 | Details |
| US2268672A | Selective amplifier | Expired / Lapsed | 1939-01-19 | 1942-01-06 | 0 | Details |
| US2266194A | Television system | Expired / Lapsed | 1939-01-23 | 1941-12-16 | 0 | Details |
| US2263645A | Frequency sensitive system | Expired / Lapsed | 1940-04-05 | 1941-11-25 | 0 | Details |
| US2262932A | Frequency variation response system | Expired / Lapsed | 1940-03-02 | 1941-11-18 | 0 | Details |
| US2262916A | Electric amplifying system | Expired / Lapsed | 1939-04-26 | 1941-11-18 | 0 | Details |
| US2262936A | Electrocardiograph | Expired / Lapsed | 1937-11-24 | 1941-11-18 | 0 | Details |
| US2262407A | Variable frequency response system | Expired / Lapsed | 1941-03-17 | 1941-11-11 | 0 | Details |
| US2262406A | Frequency modulation system | Expired / Lapsed | 1940-11-26 | 1941-11-11 | 0 | Details |
| US2258436A | Phototube for translation of images | Expired / Lapsed | 1935-06-01 | 1941-10-07 | 0 | Details |
| US2248197A | Frequency variation response circuit | Expired / Lapsed | 1940-02-14 | 1941-07-08 | 0 | Details |
| US2244259A | Electric transmission network | Expired / Lapsed | 1938-11-07 | 1941-06-03 | 0 | Details |
| US2241615A | Electric phase control system | Expired / Lapsed | 1940-02-24 | 1941-05-13 | 0 | Details |
| US2231998A | Synchronizing system | Expired / Lapsed | 1939-02-10 | 1941-02-18 | 0 | Details |
| US2231996A | Frequency variation response circuit | Expired / Lapsed | 1937-06-05 | 1941-02-18 | 0 | Details |
| US2229702A | Electrical translation circuits | Expired / Lapsed | 1938-01-03 | 1941-01-28 | 0 | Details |
| US2229699A | Electrocardiographic system | Expired / Lapsed | 1937-07-14 | 1941-01-28 | 0 | Details |
| US2227135A | Electrocardiograph | Expired / Lapsed | 1938-04-14 | 1940-12-31 | 0 | Details |
| US2225741A | Television and other signal transmission systems | Expired / Lapsed | 1937-03-25 | 1940-12-24 | 0 | Details |
| US2220098A | Frequency variation response circuit | Expired / Lapsed | 1938-06-01 | 1940-11-05 | 0 | Details |
| US2206720A | Electrical condenser | Expired / Lapsed | 1938-05-26 | 1940-07-02 | 0 | Details |
| US2200863A | Electrical circuits for controlling and measuring | Expired / Lapsed | 1934-10-03 | 1940-05-14 | 0 | Details |
| US2191315A | Electric translation circuit | Expired / Lapsed | 1938-11-01 | 1940-02-20 | 0 | Details |
| US2190069A | Space discharge device | Expired / Lapsed | 1937-04-14 | 1940-02-13 | 0 | Details |
| US2189583A | Cathode ray device | Expired / Lapsed | 1937-04-30 | 1940-02-06 | 0 | Details |
| US2186195A | Inverse feedback circuits | Expired / Lapsed | 1937-12-24 | 1940-01-09 | 0 | Details |
| US2174166A | Electrical circuits | Expired / Lapsed | 1938-02-24 | 1939-09-26 | 0 | Details |
| US2166991A | Direction finding system | Expired / Lapsed | 1937-11-24 | 1939-07-25 | 0 | Details |
| US2154127A | Electromechanical oscillating device | Expired / Lapsed | 1937-06-09 | 1939-04-11 | 0 | Details |
| US2147156A | Photoelectric apparatus | Expired / Lapsed | 1935-01-14 | 1939-02-14 | 0 | Details |
| US2142038A | Band pass filter | Expired / Lapsed | 1936-08-26 | 1938-12-27 | 0 | Details |
| US2108132A | Television device | Expired / Lapsed | 1933-09-05 | 1938-02-15 | 0 | Details |
| US2103090A | Means for and method of generating electrical currents | Expired / Lapsed | 1935-11-27 | 1937-12-21 | 0 | Details |
| US2098757A | Electric circuits | Expired / Lapsed | 1935-01-04 | 1937-11-09 | 0 | Details |
| US2088949A | Electric conductor | Expired / Lapsed | 1932-02-03 | 1937-08-03 | 0 | Details |
| US2081767A | Indicating device | Expired / Lapsed | 1935-09-10 | 1937-05-25 | 0 | Details |
| US2072962A | Radio system | Expired / Lapsed | 1934-09-08 | 1937-03-09 | 0 | Details |
| US2068741A | Gas-filled discharge tube | Expired / Lapsed | 1934-11-09 | 1937-01-26 | 0 | Details |
| US2045796A | Method for radio transmission | Expired / Lapsed | 1934-12-07 | 1936-06-30 | 0 | Details |
| US1998133A | Device and method for controlling circuits by light sensiti… | Expired / Lapsed | 1931-09-24 | 1935-04-16 | 0 | Details |
| US1998132A | Means for controlling machines | Expired / Lapsed | 1930-07-25 | 1935-04-16 | 0 | Details |
| US1986597A | Series coupled amplifier | Expired / Lapsed | 1931-02-25 | 1935-01-01 | 0 | Details |
| US1976574A | Radioreceiver | Expired / Lapsed | 1931-02-20 | 1934-10-09 | 0 | Details |
| US1956590A | Photo-electric tube | Expired / Lapsed | 1931-04-18 | 1934-05-01 | 0 | Details |
| US1944226A | Wired radio communication system | Expired / Lapsed | 1923-05-11 | 1934-01-23 | 0 | Details |
| US1878046A | Detector for modulated alternating currents | Expired / Lapsed | 1930-04-03 | 1932-09-20 | 0 | Details |
| US1840014A | Train indicator system | Expired / Lapsed | 1928-03-22 | 1932-01-05 | 0 | Details |
| US1732393A | Electrostatic phonograph pick-up | Expired / Lapsed | 1928-04-06 | 1929-10-22 | 0 | Details |
| US1601607A | Light-sensitive electrical resistance device | Expired / Lapsed | 1924-10-18 | 1926-09-28 | 0 | Details |