Patent Explorer
Browse, filter, and analyze 40 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US2522367A | Radio distance measuring system | Radio Patents Corp | Expired / Lapsed | 1945-07-28 | 1950-09-12 | 1965-07-28 | 0.0 yrs | 0 | |
| US2510338A | Means for and method of scrambling speech signals | Radio Patents Corp | Expired / Lapsed | 1946-09-05 | 1950-06-06 | 1966-09-05 | 0.0 yrs | 0 | |
| US2491810A | Receiving system for phase-keyed pulse signals | Radio Patents Corp | Expired / Lapsed | 1946-09-18 | 1949-12-20 | 1966-09-18 | 0.0 yrs | 0 | |
| US2481659A | Means for and method of synchronizing alternating electric voltages | Radio Patents Corp | Expired / Lapsed | 1947-09-11 | 1949-09-13 | 1967-09-11 | 0.0 yrs | 0 | |
| US2453988A | Automatic frequency control | Radio Patents Corp | Expired / Lapsed | 1944-02-26 | 1948-11-16 | 1964-02-26 | 0.0 yrs | 0 | |
| US2451823A | Direction finding system | Radio Patents Corp | Expired / Lapsed | 1947-12-10 | 1948-10-19 | 1967-12-10 | 0.0 yrs | 0 | |
| US2451824A | Means for and method of producing time modulated signal impulses | Radio Patents Corp | Expired / Lapsed | 1946-11-22 | 1948-10-19 | 1966-11-22 | 0.0 yrs | 0 | |
| US2446390A | Potentiometric amplifier | Radio Patents Corp | Expired / Lapsed | 1943-09-28 | 1948-08-03 | 1963-09-28 | 0.0 yrs | 0 | |
| US2440486A | Variable frequency continuous balance motor control system | Radio Patents Corp | Expired / Lapsed | 1947-06-26 | 1948-04-27 | 1967-06-26 | 0.0 yrs | 0 | |
| US2435496A | Impulse modulation system | Radio Patents Corp | Expired / Lapsed | 1945-03-13 | 1948-02-03 | 1965-03-13 | 0.0 yrs | 0 | |
| US2423616A | Self-balancing translation system | Radio Patents Corp | Expired / Lapsed | 1944-02-01 | 1947-07-08 | 1964-02-01 | 0.0 yrs | 0 | |
| US2419637A | Synchronizing system | Radio Patents Corp | Expired / Lapsed | 1944-09-08 | 1947-04-29 | 1964-09-08 | 0.0 yrs | 0 | |
| US2405500A | Means for and method of secret signaling | Radio Patents Corp | Expired / Lapsed | 1944-02-26 | 1946-08-06 | 1964-02-26 | 0.0 yrs | 0 | |
| US2361193A | Control device, particularly thermostatic device | Radio Patents Corp | Expired / Lapsed | 1939-07-12 | 1944-10-24 | 1959-07-12 | 0.0 yrs | 0 | |
| US2272235A | Electron tube amplifier | Radio Patents Corp | Expired / Lapsed | 1940-05-28 | 1942-02-10 | 1960-05-28 | 0.0 yrs | 0 | |
| US2269688A | Electronic modulator | Radio Patents Corp | Expired / Lapsed | 1941-02-24 | 1942-01-13 | 1961-02-24 | 0.0 yrs | 0 | |
| US2268587A | Distance determining system | Radio Patents Corp | Expired / Lapsed | 1940-03-06 | 1942-01-06 | 1960-03-06 | 0.0 yrs | 0 | |
| US2262932A | Frequency variation response system | Radio Patents Corp | Expired / Lapsed | 1940-03-02 | 1941-11-18 | 1960-03-02 | 0.0 yrs | 0 | |
| US2262936A | Electrocardiograph | Radio Patents Corp | Expired / Lapsed | 1937-11-24 | 1941-11-18 | 1957-11-24 | 0.0 yrs | 0 | |
| US2262406A | Frequency modulation system | Radio Patents Corp | Expired / Lapsed | 1940-11-26 | 1941-11-11 | 1960-11-26 | 0.0 yrs | 0 |
Showing 1 to 20 of 40 patents
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