Hygrade Sylvania Corp
Hygrade SyActive Patents
0
Total Holdings
22
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 |
| US2250647A | Shielded radio tube and the like | Expired / Lapsed | 1937-12-04 | 1941-07-29 | 0 | Details |
| US2250189A | Method of applying fluorescent material in cathode-ray tube… | Expired / Lapsed | 1937-05-03 | 1941-07-22 | 0 | Details |
| US2227630A | Television receiving system | Expired / Lapsed | 1937-11-05 | 1941-01-07 | 0 | Details |
| US2219573A | Method of making composite glassmetal articles | Expired / Lapsed | 1936-06-01 | 1940-10-29 | 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 |
| US2205359A | Superheterodyne receiver | Expired / Lapsed | 1938-06-24 | 1940-06-18 | 0 | Details |
| US2181294A | Electric discharge lamp | Expired / Lapsed | 1938-12-31 | 1939-11-28 | 0 | Details |
| US2181305A | Fluorescent lamp | Expired / Lapsed | 1938-12-22 | 1939-11-28 | 0 | Details |
| US2181292A | Reflector bulb lamp | Expired / Lapsed | 1937-11-02 | 1939-11-28 | 0 | Details |
| US2179453A | Binder and coating materials and method of producing the sa… | Expired / Lapsed | 1935-03-18 | 1939-11-07 | 0 | Details |
| US2174853A | Electron gun structure and method of assembly thereof | Expired / Lapsed | 1937-08-26 | 1939-10-03 | 0 | Details |
| US2123706A | Method of manufacture of reflector bulbs | Expired / Lapsed | 1933-09-28 | 1938-07-12 | 0 | Details |
| US2113961A | Electrostatic condenser | Expired / Lapsed | 1935-08-16 | 1938-04-12 | 0 | Details |
| US2064369A | Electric discharge tube | Expired / Lapsed | 1934-11-17 | 1936-12-15 | 0 | Details |
| US2060043A | Arc discharge lamp | Expired / Lapsed | 1935-05-29 | 1936-11-10 | 0 | Details |
| US2049152A | Base for tubes, lamps and the like | Expired / Lapsed | 1935-05-29 | 1936-07-28 | 0 | Details |
| US2028338A | Electrical apparatus | Expired / Lapsed | 1931-10-30 | 1936-01-21 | 0 | Details |
| US1999014A | Manufacture of incandescent electric lamps | Expired / Lapsed | 1931-01-21 | 1935-04-23 | 0 | Details |