Hygrade Sylvania Corp
Hygrade SyActive Patents
0
Total Holdings
10
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2268510A | Lamp sealing apparatus | Expired / Lapsed | 1941-01-02 | 1941-12-30 | 0 | Details |
| US2268512A | Series lamp circuit | Expired / Lapsed | 1940-10-26 | 1941-12-30 | 0 | Details |
| US2211614A | Cathode ray tube and the like | Expired / Lapsed | 1937-06-24 | 1940-08-13 | 0 | Details |
| US2211613A | Cathode ray tube | Expired / Lapsed | 1936-08-14 | 1940-08-13 | 0 | Details |
| US2209929A | Electrographic system and apparatus | Expired / Lapsed | 1937-11-20 | 1940-07-30 | 0 | Details |
| US2181294A | Electric discharge lamp | Expired / Lapsed | 1938-12-31 | 1939-11-28 | 0 | Details |
| US2181292A | Reflector bulb lamp | Expired / Lapsed | 1937-11-02 | 1939-11-28 | 0 | Details |
| US2174853A | Electron gun structure and method of assembly thereof | Expired / Lapsed | 1937-08-26 | 1939-10-03 | 0 | Details |
| US2064369A | Electric discharge tube | Expired / Lapsed | 1934-11-17 | 1936-12-15 | 0 | Details |
| US2028338A | Electrical apparatus | Expired / Lapsed | 1931-10-30 | 1936-01-21 | 0 | Details |