H A DOUGLAS Manufacturing Co
H A DOUGLAActive Patents
0
Total Holdings
13
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2461024A | Coupling device | Expired / Lapsed | 1944-12-12 | 1949-02-08 | 0 | Details |
| US2444888A | Coupling | Expired / Lapsed | 1944-12-12 | 1948-07-06 | 0 | Details |
| US2431583A | Electrical connection means | Expired / Lapsed | 1942-01-12 | 1947-11-25 | 0 | Details |
| US2361448A | Electrical connection means | Expired / Lapsed | 1942-08-24 | 1944-10-31 | 0 | Details |
| US2357955A | Lamp socket unit | Expired / Lapsed | 1941-06-21 | 1944-09-12 | 0 | Details |
| US2346831A | Electrical connection means | Expired / Lapsed | 1943-06-15 | 1944-04-18 | 0 | Details |
| US2318651A | Electrical connection means | Expired / Lapsed | 1941-10-11 | 1943-05-11 | 0 | Details |
| US2318650A | Electrical connection means | Expired / Lapsed | 1940-04-01 | 1943-05-11 | 0 | Details |
| US2303384A | Connector | Expired / Lapsed | 1938-04-30 | 1942-12-01 | 0 | Details |
| US2299787A | Electrical connection means | Expired / Lapsed | 1939-03-17 | 1942-10-27 | 0 | Details |
| US2280351A | Swaging apparatus | Expired / Lapsed | 1940-02-01 | 1942-04-21 | 0 | Details |
| US2249977A | Electrical connection means | Expired / Lapsed | 1939-12-05 | 1941-07-22 | 0 | Details |
| US2226850A | Electric switch | Expired / Lapsed | 1937-11-26 | 1940-12-31 | 0 | Details |