General Radio Co
General RaActive Patents
0
Total Holdings
20
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3553728A | Frequency measuring apparatus with automatic adjustment of … | Expired / Lapsed | 1968-05-20 | 1971-01-05 | 0 | Details |
| US3300731A | Digital frequency synthesizer having a plurality of selecta… | Expired / Lapsed | 1964-07-27 | 1967-01-24 | 2 | Details |
| US3050685A | Digital frequency divider and method | Expired / Lapsed | 1959-06-24 | 1962-08-21 | 0 | Details |
| US2942172A | Method of and system for supplying power | Expired / Lapsed | 1956-02-20 | 1960-06-21 | 0 | Details |
| US2715718A | Voltage-selection and comparison system and method | Expired / Lapsed | 1954-05-13 | 1955-08-16 | 0 | Details |
| US2586397A | Speed control system for alternating current motors | Expired / Lapsed | 1946-07-08 | 1952-02-19 | 0 | Details |
| US2374248A | Pulse-integrating circuit | Expired / Lapsed | 1941-12-02 | 1945-04-24 | 0 | Details |
| US2362503A | Frequency-measuring-device | Expired / Lapsed | 1941-12-10 | 1944-11-14 | 0 | Details |
| US2354718A | Electric system | Expired / Lapsed | 1941-11-08 | 1944-08-01 | 0 | Details |
| US2298177A | Electric filter circuit | Expired / Lapsed | 1939-05-25 | 1942-10-06 | 0 | Details |
| US2294941A | Null type meter and method | Expired / Lapsed | 1941-01-08 | 1942-09-08 | 0 | Details |
| US2173426A | Electric system | Expired / Lapsed | 1937-08-30 | 1939-09-19 | 0 | Details |
| US2119389A | Frequency meter | Expired / Lapsed | 1935-12-06 | 1938-05-31 | 0 | Details |
| US2104336A | Electric system | Expired / Lapsed | 1932-07-30 | 1938-01-04 | 0 | Details |
| US2012497A | Electrical system | Expired / Lapsed | 1933-03-11 | 1935-08-27 | 0 | Details |
| US2009013A | Alternating-current apparatus | Expired / Lapsed | 1934-06-01 | 1935-07-23 | 0 | Details |
| US1944315A | Electric system and method | Expired / Lapsed | 1931-10-22 | 1934-01-23 | 0 | Details |
| US1901344A | Power-level indicator | Expired / Lapsed | 1931-06-27 | 1933-03-14 | 0 | Details |
| US1901343A | Electric instrument | Expired / Lapsed | 1931-03-30 | 1933-03-14 | 0 | Details |
| US1874196A | Sound ranging system | Expired / Lapsed | 1928-07-16 | 1932-08-30 | 0 | Details |