Associated Telephone and Telegraph Co
AssociatedActive Patents
0
Total Holdings
10
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2301748A | Electrical selective signaling system | Expired / Lapsed | 1939-12-18 | 1942-11-10 | 0 | Details |
| US2289939A | Telephone system | Expired / Lapsed | 1939-12-18 | 1942-07-14 | 0 | Details |
| US2282271A | Electrical signaling system | Expired / Lapsed | 1938-10-19 | 1942-05-05 | 0 | Details |
| US2279697A | Electrical signaling system | Expired / Lapsed | 1939-02-06 | 1942-04-14 | 0 | Details |
| US2248784A | Electrical signaling system | Expired / Lapsed | 1939-01-18 | 1941-07-08 | 0 | Details |
| US2137423A | Automatic switch | Expired / Lapsed | 1935-10-31 | 1938-11-22 | 0 | Details |
| US2135794A | Remote control system | Expired / Lapsed | 1936-01-18 | 1938-11-08 | 0 | Details |
| US1924661A | Telephone system | Expired / Lapsed | 1931-05-04 | 1933-08-29 | 0 | Details |
| US1901156A | Telephone system | Expired / Lapsed | 1931-06-01 | 1933-03-14 | 0 | Details |
| US1789811A | Counting or reglstering apparatus | Expired / Lapsed | 1924-09-29 | 1931-01-20 | 0 | Details |