Patent Explorer
Browse, filter, and analyze 22 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US3868673A | Display apparatus including character enhancement | AT&T Teletype Corp | Expired / Lapsed | 1973-08-14 | 1975-02-25 | 1993-08-14 | 0.0 yrs | 17 | |
| US3551886A | Automatic error detection and correction system | AT&T Teletype Corp | Expired / Lapsed | 1968-07-16 | 1970-12-29 | 1988-07-16 | 0.0 yrs | 0 | |
| US3456239A | Block synchronization circuit for an error detection and correction system | AT&T Teletype Corp | Expired / Lapsed | 1965-12-10 | 1969-07-15 | 1985-12-10 | 0.0 yrs | 0 | |
| US2667533A | Automatic message switching system | AT&T Teletype Corp | Expired / Lapsed | 1950-05-10 | 1954-01-26 | 1970-05-10 | 0.0 yrs | 0 | |
| US2560474A | Keyboard operated magnetic recorder | AT&T Teletype Corp | Expired / Lapsed | 1947-06-18 | 1951-07-10 | 1967-06-18 | 0.0 yrs | 0 | |
| US2522453A | Selective signaling system and apparatus | AT&T Teletype Corp | Expired / Lapsed | 1945-06-14 | 1950-09-12 | 1965-06-14 | 0.0 yrs | 0 | |
| US2505728A | Selective signaling system and apparatus | AT&T Teletype Corp | Expired / Lapsed | 1945-06-14 | 1950-04-25 | 1965-06-14 | 0.0 yrs | 0 | |
| US2451045A | Automatic message numbering telegraph transmitter | AT&T Teletype Corp | Expired / Lapsed | 1943-12-20 | 1948-10-12 | 1963-12-20 | 0.0 yrs | 0 | |
| US2436229A | Recorder | AT&T Teletype Corp | Expired / Lapsed | 1943-07-29 | 1948-02-17 | 1963-07-29 | 0.0 yrs | 0 | |
| US2419730A | Printing telegraph system having serially connected, step-by-step automatically selective stations | AT&T Teletype Corp | Expired / Lapsed | 1944-02-28 | 1947-04-29 | 1964-02-28 | 0.0 yrs | 0 | |
| US2405168A | Projector for page printers | AT&T Teletype Corp | Expired / Lapsed | 1940-07-17 | 1946-08-06 | 1960-07-17 | 0.0 yrs | 0 | |
| US2404339A | Printing telegraph apparatus | AT&T Teletype Corp | Expired / Lapsed | 1945-02-28 | 1946-07-16 | 1965-02-28 | 0.0 yrs | 0 | |
| US2341568A | Message tabulating apparatus and system | AT&T Teletype Corp | Expired / Lapsed | 1939-09-11 | 1944-02-15 | 1959-09-11 | 0.0 yrs | 0 | |
| US2335335A | Communication system | AT&T Teletype Corp | Expired / Lapsed | 1941-01-18 | 1943-11-30 | 1961-01-18 | 0.0 yrs | 0 | |
| US2298513A | Protective coating | AT&T Teletype Corp | Expired / Lapsed | 1939-10-13 | 1942-10-13 | 1959-10-13 | 0.0 yrs | 0 | |
| US2255794A | Printing perforating telegraph apparatus | AT&T Teletype Corp | Expired / Lapsed | 1939-05-20 | 1941-09-16 | 1959-05-20 | 0.0 yrs | 0 | |
| US2220885A | Record projector | AT&T Teletype Corp | Expired / Lapsed | 1938-12-17 | 1940-11-12 | 1958-12-17 | 0.0 yrs | 0 | |
| US2207744A | Coding mechanism | AT&T Teletype Corp | Expired / Lapsed | 1937-04-03 | 1940-07-16 | 1957-04-03 | 0.0 yrs | 0 | |
| US2152010A | Station selection | AT&T Teletype Corp | Expired / Lapsed | 1936-12-24 | 1939-03-28 | 1956-12-24 | 0.0 yrs | 0 | |
| US2024006A | Keyboard perforator and counter | AT&T Teletype Corp | Expired / Lapsed | 1932-03-25 | 1935-12-10 | 1952-03-25 | 0.0 yrs | 0 |
Showing 1 to 20 of 22 patents
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