Engineering & Res Corp
EngineerinActive Patents
0
Total Holdings
13
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2404639A | Means to turn rotatable structures | Expired / Lapsed | 1942-04-10 | 1946-07-23 | 0 | Details |
| US2366164A | Brazing | Expired / Lapsed | 1943-02-17 | 1945-01-02 | 0 | Details |
| US2173089A | Traffic responsive device | Expired / Lapsed | 1936-03-19 | 1939-09-19 | 0 | Details |
| US2122410A | Traffic control system and apparatus | Expired / Lapsed | 1934-11-12 | 1938-07-05 | 0 | Details |
| US2090619A | Traffic control system | Expired / Lapsed | 1930-04-23 | 1937-08-24 | 0 | Details |
| US2088697A | Traffic control system | Expired / Lapsed | 1936-04-07 | 1937-08-03 | 0 | Details |
| US2086913A | Transmitting apparatus | Expired / Lapsed | 1931-03-14 | 1937-07-13 | 0 | Details |
| US2045136A | Traffic actuated signal system | Expired / Lapsed | 1928-03-10 | 1936-06-23 | 0 | Details |
| US2040919A | Circuit closer | Expired / Lapsed | 1932-04-07 | 1936-05-19 | 0 | Details |
| US2040425A | Control mechanism | Expired / Lapsed | 1931-07-31 | 1936-05-12 | 0 | Details |
| US1950490A | Electric switch | Expired / Lapsed | 1931-11-06 | 1934-03-13 | 0 | Details |
| US1944723A | Control for traffic signal systems | Expired / Lapsed | 1930-04-15 | 1934-01-23 | 0 | Details |
| US1928472A | Switch | Expired / Lapsed | 1931-07-30 | 1933-09-26 | 0 | Details |