AT&T Teletype Corp
AT&T TeletActive Patents
0
Total Holdings
13
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3868673A | Display apparatus including character enhancement | Expired / Lapsed | 1973-08-14 | 1975-02-25 | 17 | Details |
| US3456239A | Block synchronization circuit for an error detection and co… | Expired / Lapsed | 1965-12-10 | 1969-07-15 | 0 | Details |
| US2667533A | Automatic message switching system | Expired / Lapsed | 1950-05-10 | 1954-01-26 | 0 | Details |
| US2522453A | Selective signaling system and apparatus | Expired / Lapsed | 1945-06-14 | 1950-09-12 | 0 | Details |
| US2505728A | Selective signaling system and apparatus | Expired / Lapsed | 1945-06-14 | 1950-04-25 | 0 | Details |
| US2451045A | Automatic message numbering telegraph transmitter | Expired / Lapsed | 1943-12-20 | 1948-10-12 | 0 | Details |
| US2404339A | Printing telegraph apparatus | Expired / Lapsed | 1945-02-28 | 1946-07-16 | 0 | Details |
| US2341568A | Message tabulating apparatus and system | Expired / Lapsed | 1939-09-11 | 1944-02-15 | 0 | Details |
| US2335335A | Communication system | Expired / Lapsed | 1941-01-18 | 1943-11-30 | 0 | Details |
| US2298513A | Protective coating | Expired / Lapsed | 1939-10-13 | 1942-10-13 | 0 | Details |
| US2220885A | Record projector | Expired / Lapsed | 1938-12-17 | 1940-11-12 | 0 | Details |
| US2152010A | Station selection | Expired / Lapsed | 1936-12-24 | 1939-03-28 | 0 | Details |
| US1821110A | Selecting and printing mechanism | Expired / Lapsed | 1929-03-20 | 1931-09-01 | 0 | Details |