Signal Engineering & Manufacturing Co
Signal EngActive Patents
0
Total Holdings
7
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2439331A | Warning signal system for refrigerators | Expired / Lapsed | 1946-01-12 | 1948-04-06 | 0 | Details |
| US2429069A | Electrical circuit controller | Expired / Lapsed | 1943-10-20 | 1947-10-14 | 0 | Details |
| US2255201A | Code setting device for signal systems | Expired / Lapsed | 1938-04-08 | 1941-09-09 | 0 | Details |
| US2170100A | Code setting device for signal systems | Expired / Lapsed | 1935-01-17 | 1939-08-22 | 0 | Details |
| US1909212A | Selective control circuit for alarm systems | Expired / Lapsed | 1930-03-11 | 1933-05-16 | 0 | Details |
| US1848148A | Electrical signal system | Expired / Lapsed | 1927-01-05 | 1932-03-08 | 0 | Details |
| US1809020A | Signal code sending device and system | Expired / Lapsed | 1927-01-03 | 1931-06-09 | 0 | Details |