AT&T Teletype Corp
AT&T TeletActive Patents
0
Total Holdings
162
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US4134695A | Printer carriage | Expired / Lapsed | 1977-07-13 | 1979-01-16 | 11 | Details |
| US4101018A | Paper edge sensor | Expired / Lapsed | 1977-03-01 | 1978-07-18 | 3 | Details |
| US4070696A | Method and apparatus for cancelling nontonal variations in … | Expired / Lapsed | 1976-05-10 | 1978-01-24 | 4 | Details |
| US4010388A | Low power asynchronous latch | Expired / Lapsed | 1976-02-18 | 1977-03-01 | 15 | Details |
| US3983317A | Astigmatizer for laser recording and reproducing system | Expired / Lapsed | 1974-12-09 | 1976-09-28 | 15 | Details |
| US3978522A | Method and apparatus for mounting a cassette record-playbac… | Expired / Lapsed | 1975-10-06 | 1976-08-31 | 10 | Details |
| US3977007A | Gray tone generation | Expired / Lapsed | 1975-06-02 | 1976-08-24 | 14 | Details |
| US3944848A | Voltage sensitive isolation for static logic circuit | Expired / Lapsed | 1974-12-23 | 1976-03-16 | 13 | Details |
| US3935938A | Line feed mechanism for printer | Expired / Lapsed | 1975-04-07 | 1976-02-03 | 21 | Details |
| US3931610A | Capacitive keyswitch sensor and method | Expired / Lapsed | 1973-11-29 | 1976-01-06 | 22 | Details |
| US3903431A | Clocked dynamic inverter | Expired / Lapsed | 1973-12-28 | 1975-09-02 | 7 | Details |
| US3898671A | Ink jet recording | Expired / Lapsed | 1973-12-12 | 1975-08-05 | 10 | Details |
| US3886543A | Debounce logic for keyboard | Expired / Lapsed | 1973-11-29 | 1975-05-27 | 18 | Details |
| US3868673A | Display apparatus including character enhancement | Expired / Lapsed | 1973-08-14 | 1975-02-25 | 17 | Details |
| US3838404A | Random access memory system and cell | Expired / Lapsed | 1973-05-17 | 1974-09-24 | 73 | Details |
| US3789140A | Tiltable display screen assembly | Expired / Lapsed | 1972-07-03 | 1974-01-29 | 9 | Details |
| US3789239A | Signal boost for shift register | Expired / Lapsed | 1971-07-12 | 1974-01-29 | 27 | Details |
| US3771035A | Plural lineal movement system and process | Expired / Lapsed | 1972-05-15 | 1973-11-06 | 13 | Details |
| US3747117A | Laser writing | Expired / Lapsed | 1971-03-31 | 1973-07-17 | 1 | Details |
| US3740761A | Laser recording medium | Expired / Lapsed | 1971-05-28 | 1973-06-19 | 4 | Details |
| US3704353A | Alternate action mechanism with magnetic latch cam follower… | Expired / Lapsed | 1970-09-16 | 1972-11-28 | 2 | Details |
| US3689936A | Lateral oscillation to form ink droplets | Expired / Lapsed | 1970-08-20 | 1972-09-05 | 2 | Details |
| US3671822A | Variable capacitive apparatus | Expired / Lapsed | 1970-12-17 | 1972-06-20 | 25 | Details |
| US3666069A | Ribbon positioning mechanism for telegraph printers | Expired / Lapsed | 1969-09-15 | 1972-05-30 | 24 | Details |
| US3579245A | Method of transferring liquid | Expired / Lapsed | 1967-12-07 | 1971-05-18 | 14 | Details |
| US3551886A | Automatic error detection and correction system | Expired / Lapsed | 1968-07-16 | 1970-12-29 | 0 | Details |
| US3500436A | Fluid transfer device | Expired / Lapsed | 1968-01-08 | 1970-03-10 | 0 | Details |
| US3495239A | Photoelectric keyboard | Expired / Lapsed | 1967-08-15 | 1970-02-10 | 0 | Details |
| US3484794A | Fluid transfer device | Expired / Lapsed | 1967-11-09 | 1969-12-16 | 0 | Details |
| US3473150A | Block synchronization circuit for a data communications sys… | Expired / Lapsed | 1966-08-10 | 1969-10-14 | 0 | Details |
| US3472956A | Synchronizing circuit for a receiving distributor | Expired / Lapsed | 1965-11-02 | 1969-10-14 | 0 | Details |
| US3461313A | Circuit for maintaining selected circuits operated | Expired / Lapsed | 1965-12-09 | 1969-08-12 | 0 | Details |
| US3460244A | Method of manufacturing a multi-track magnetic head | Expired / Lapsed | 1965-09-10 | 1969-08-12 | 0 | Details |
| US3456239A | Block synchronization circuit for an error detection and co… | Expired / Lapsed | 1965-12-10 | 1969-07-15 | 0 | Details |
| US3432772A | Differential relaxation oscillator | Expired / Lapsed | 1967-05-15 | 1969-03-11 | 0 | Details |
| US3399351A | Sequence detection circuit | Expired / Lapsed | 1966-04-07 | 1968-08-27 | 0 | Details |
| US3340354A | Printing telegraph transmitter set | Expired / Lapsed | 1963-09-17 | 1967-09-05 | 1 | Details |
| US3264418A | Programmable switching assemblage | Expired / Lapsed | 1964-04-23 | 1966-08-02 | 2 | Details |
| US3242461A | Error detection system | Expired / Lapsed | 1961-12-28 | 1966-03-22 | 2 | Details |
| US3222008A | Reel accelerator and brake mechanism | Expired / Lapsed | 1963-05-16 | 1965-12-07 | 2 | Details |
| US3200192A | Communication system | Expired / Lapsed | 1962-01-15 | 1965-08-10 | 2 | Details |
| US3045061A | Signal distortion indicator | Expired / Lapsed | 1958-12-23 | 1962-07-17 | 0 | Details |
| US3014093A | Printing telegraph storage transmistter with card reader an… | Expired / Lapsed | 1959-09-18 | 1961-12-19 | 0 | Details |
| US3014092A | High speed reversible tape reader | Expired / Lapsed | 1957-04-30 | 1961-12-19 | 0 | Details |
| US3008005A | Apparatus for detecting errors in telegraph signals | Expired / Lapsed | 1959-05-28 | 1961-11-07 | 0 | Details |
| US3003032A | Method of and apparatus for controlling high speed tape rep… | Expired / Lapsed | 1958-06-05 | 1961-10-03 | 0 | Details |
| US2986649A | Transistor multivibrator circuits | Expired / Lapsed | 1955-10-25 | 1961-05-30 | 0 | Details |
| US2924658A | Synchronous electronic multiplex telegraph ciphering system | Expired / Lapsed | 1957-07-09 | 1960-02-09 | 0 | Details |
| US2912654A | Transistor oscillatory control circuit | Expired / Lapsed | 1955-10-27 | 1959-11-10 | 0 | Details |
| US2905835A | Transistor relay and signal shaping device | Expired / Lapsed | 1955-05-27 | 1959-09-22 | 0 | Details |
| US2892031A | Typing reperforator | Expired / Lapsed | 1954-12-16 | 1959-06-23 | 0 | Details |
| US2874215A | Two-tape cipher system | Expired / Lapsed | 1955-03-23 | 1959-02-17 | 0 | Details |
| US2866104A | Frequency divider circuit | Expired / Lapsed | 1955-12-08 | 1958-12-23 | 0 | Details |
| US2832023A | Modular tape control system | Expired / Lapsed | 1956-07-19 | 1958-04-22 | 0 | Details |
| US2762477A | Positive engaging clutch | Expired / Lapsed | 1951-10-02 | 1956-09-11 | 0 | Details |
| FR1096793A | Transistor distributor | Expired / Lapsed | 1954-03-13 | 1955-06-24 | 0 | Details |
| FR1090759A | Transistor relay | Expired / Lapsed | 1953-10-14 | 1955-04-04 | 0 | Details |
| US2687451A | Single channel telegraph transmitting distributor | Expired / Lapsed | 1953-04-15 | 1954-08-24 | 0 | Details |
| US2677725A | Telegraph receiver utilizing electronic distributors | Expired / Lapsed | 1950-09-12 | 1954-05-04 | 0 | Details |
| US2675078A | High-speed reperforator | Expired / Lapsed | 1950-03-10 | 1954-04-13 | 0 | Details |
| US2672501A | Motor control device for telegraphy | Expired / Lapsed | 1950-12-05 | 1954-03-16 | 0 | Details |
| US2667533A | Automatic message switching system | Expired / Lapsed | 1950-05-10 | 1954-01-26 | 0 | Details |
| US2666095A | Telegraph printer | Expired / Lapsed | 1951-10-06 | 1954-01-12 | 0 | Details |
| US2659767A | Tape controlled telegraph transmitter | Expired / Lapsed | 1951-11-01 | 1953-11-17 | 0 | Details |
| US2643290A | High-speed telegraph transmitter | Expired / Lapsed | 1950-04-01 | 1953-06-23 | 0 | Details |
| US2614217A | Electronic distributor | Expired / Lapsed | 1949-10-29 | 1952-10-14 | 0 | Details |
| US2613809A | Ticket sorting apparatus | Expired / Lapsed | 1946-10-25 | 1952-10-14 | 0 | Details |
| US2609451A | Multiplex telegraph system utilizing electronic distributors | Expired / Lapsed | 1948-10-15 | 1952-09-02 | 0 | Details |
| US2609452A | Multiplex telegraph system employing electronic distributor | Expired / Lapsed | 1945-05-28 | 1952-09-02 | 0 | Details |
| US2605366A | Contact assembly | Expired / Lapsed | 1949-01-13 | 1952-07-29 | 0 | Details |
| US2595714A | Electronic multiplex to start-stop extensor | Expired / Lapsed | 1950-06-24 | 1952-05-06 | 0 | Details |
| US2586669A | Fixed message inserter | Expired / Lapsed | 1949-12-20 | 1952-02-19 | 0 | Details |
| US2585282A | Electronic multiplex to start-stop extensor | Expired / Lapsed | 1950-06-24 | 1952-02-12 | 0 | Details |
| US2582218A | Electronic start-stop to multiplex extensor | Expired / Lapsed | 1948-10-15 | 1952-01-15 | 0 | Details |
| US2581961A | Signal comparing apparatus | Expired / Lapsed | 1949-03-04 | 1952-01-08 | 0 | Details |
| US2574138A | Selector mechanism | Expired / Lapsed | 1948-03-17 | 1951-11-06 | 0 | Details |
| US2565266A | High-speed photoelectric transmitter | Expired / Lapsed | 1947-06-20 | 1951-08-21 | 0 | Details |
| US2560474A | Keyboard operated magnetic recorder | Expired / Lapsed | 1947-06-18 | 1951-07-10 | 0 | Details |
| US2555622A | Printing telegraph apparatus | Expired / Lapsed | 1948-05-25 | 1951-06-05 | 0 | Details |
| US2554903A | Vertical tabulation mechanism for telegraph printers | Expired / Lapsed | 1950-03-07 | 1951-05-29 | 0 | Details |
| US2554794A | Transmitting apparatus | Expired / Lapsed | 1948-11-05 | 1951-05-29 | 0 | Details |
| US2550427A | Magnetic recording and transmitting system | Expired / Lapsed | 1947-06-11 | 1951-04-24 | 0 | Details |
| US2550411A | Distributor brush control apparatus | Expired / Lapsed | 1946-02-28 | 1951-04-24 | 0 | Details |
| US2544383A | Speed regulation of dynamotors | Expired / Lapsed | 1947-01-17 | 1951-03-06 | 0 | Details |
| US2536528A | Feed out mechanism for telegraph printers | Expired / Lapsed | 1948-12-22 | 1951-01-02 | 0 | Details |
| US2534494A | Telegraph transmitter | Expired / Lapsed | 1947-10-04 | 1950-12-19 | 0 | Details |
| US2522463A | Receptacle for magnetizable record strips | Expired / Lapsed | 1947-06-11 | 1950-09-12 | 0 | Details |
| US2522453A | Selective signaling system and apparatus | Expired / Lapsed | 1945-06-14 | 1950-09-12 | 0 | Details |
| US2512038A | Error detecting code system | Expired / Lapsed | 1947-06-07 | 1950-06-20 | 0 | Details |
| US2505728A | Selective signaling system and apparatus | Expired / Lapsed | 1945-06-14 | 1950-04-25 | 0 | Details |
| US2501063A | Station selector signaling system | Expired / Lapsed | 1947-02-13 | 1950-03-21 | 0 | Details |
| US2495946A | Synchronizing corrector circuit | Expired / Lapsed | 1945-06-27 | 1950-01-31 | 0 | Details |
| US2492584A | Pulsing device for electrically operated perforators | Expired / Lapsed | 1947-06-27 | 1949-12-27 | 0 | Details |
| US2481354A | Bias indicator | Expired / Lapsed | 1948-03-11 | 1949-09-06 | 0 | Details |
| US2456740A | Tape perforator | Expired / Lapsed | 1946-06-22 | 1948-12-21 | 0 | Details |
| US2451045A | Automatic message numbering telegraph transmitter | Expired / Lapsed | 1943-12-20 | 1948-10-12 | 0 | Details |
| US2436229A | Recorder | Expired / Lapsed | 1943-07-29 | 1948-02-17 | 0 | Details |
| US2419730A | Printing telegraph system having serially connected, step-b… | Expired / Lapsed | 1944-02-28 | 1947-04-29 | 0 | Details |
| US2418928A | Telegraph system and apparatus for selective single or doub… | Expired / Lapsed | 1944-11-04 | 1947-04-15 | 0 | Details |
| US2411191A | Dial selective calling system | Expired / Lapsed | 1944-11-04 | 1946-11-19 | 0 | Details |
| US2405168A | Projector for page printers | Expired / Lapsed | 1940-07-17 | 1946-08-06 | 0 | Details |
| US2404339A | Printing telegraph apparatus | Expired / Lapsed | 1945-02-28 | 1946-07-16 | 0 | Details |
| US2397202A | Photoelectric transmitter synchronizer | Expired / Lapsed | 1944-06-15 | 1946-03-26 | 0 | Details |
| US2392484A | Printing telegraph apparatus | Expired / Lapsed | 1944-01-18 | 1946-01-08 | 0 | Details |
| US2384558A | Selecting impulse transmitter | Expired / Lapsed | 1943-01-26 | 1945-09-11 | 0 | Details |
| US2377573A | Tape message container | Expired / Lapsed | 1943-07-19 | 1945-06-05 | 0 | Details |
| US2375383A | Selective signaling system | Expired / Lapsed | 1929-01-17 | 1945-05-08 | 0 | Details |
| US2372515A | Automatic transmitter | Expired / Lapsed | 1943-10-07 | 1945-03-27 | 0 | Details |
| US2360580A | Telegraph system and printing apparatus | Expired / Lapsed | 1942-11-12 | 1944-10-17 | 0 | Details |
| US2357297A | Printing telegraph system | Expired / Lapsed | 1940-07-13 | 1944-09-05 | 0 | Details |
| US2354733A | Transmitter | Expired / Lapsed | 1943-02-26 | 1944-08-01 | 0 | Details |
| US2351229A | Tape feed alarm | Expired / Lapsed | 1942-04-27 | 1944-06-13 | 0 | Details |
| US2343882A | Keyboard printing and perforating apparatus | Expired / Lapsed | 1942-08-17 | 1944-03-14 | 0 | Details |
| US2341568A | Message tabulating apparatus and system | Expired / Lapsed | 1939-09-11 | 1944-02-15 | 0 | Details |
| US2336910A | Telegraph transmitter | Expired / Lapsed | 1942-08-15 | 1943-12-14 | 0 | Details |
| US2335335A | Communication system | Expired / Lapsed | 1941-01-18 | 1943-11-30 | 0 | Details |
| US2333318A | Printing telegraph apparatus | Expired / Lapsed | 1941-06-09 | 1943-11-02 | 0 | Details |
| US2331914A | Telegraph transmitting system | Expired / Lapsed | 1941-04-18 | 1943-10-19 | 0 | Details |
| US2319263A | Multiplex extensor | Expired / Lapsed | 1941-08-13 | 1943-05-18 | 0 | Details |
| US2316795A | Keyboard perforator | Expired / Lapsed | 1941-07-05 | 1943-04-20 | 0 | Details |
| US2298513A | Protective coating | Expired / Lapsed | 1939-10-13 | 1942-10-13 | 0 | Details |
| US2284681A | Recording and exhibiting mechanism | Expired / Lapsed | 1939-05-15 | 1942-06-02 | 0 | Details |
| US2284680A | Synchronous simplex telegraph system | Expired / Lapsed | 1937-10-04 | 1942-06-02 | 0 | Details |
| US2281596A | Telegraphic transmission by space discharge control | Expired / Lapsed | 1938-03-07 | 1942-05-05 | 0 | Details |
| US2279310A | Quick-change toolholder | Expired / Lapsed | 1939-05-04 | 1942-04-14 | 0 | Details |
| US2278485A | Photoelectric transmitter | Expired / Lapsed | 1938-12-22 | 1942-04-07 | 0 | Details |
| US2273067A | Printing telegraph apparatus | Expired / Lapsed | 1940-07-13 | 1942-02-17 | 0 | Details |
| US2255794A | Printing perforating telegraph apparatus | Expired / Lapsed | 1939-05-20 | 1941-09-16 | 0 | Details |
| US2248583A | Code translating mechanism | Expired / Lapsed | 1938-12-27 | 1941-07-08 | 0 | Details |
| US2237378A | Assembled gauge | Expired / Lapsed | 1938-04-21 | 1941-04-08 | 0 | Details |
| US2234832A | Photoelectric transmitter | Expired / Lapsed | 1938-01-10 | 1941-03-11 | 0 | Details |
| US2230435A | Orientation automatic adjusting | Expired / Lapsed | 1938-11-17 | 1941-02-04 | 0 | Details |
| US2225657A | Telegraph message classification system | Expired / Lapsed | 1933-03-30 | 1940-12-24 | 0 | Details |
| US2220885A | Record projector | Expired / Lapsed | 1938-12-17 | 1940-11-12 | 0 | Details |
| US2211232A | Station selection by printer selector | Expired / Lapsed | 1938-01-17 | 1940-08-13 | 0 | Details |
| US2207744A | Coding mechanism | Expired / Lapsed | 1937-04-03 | 1940-07-16 | 0 | Details |
| US2207743A | Telegraphic transmission and automatic printing of meter re… | Expired / Lapsed | 1935-12-31 | 1940-07-16 | 0 | Details |
| US2200807A | Keyboard | Expired / Lapsed | 1938-10-12 | 1940-05-14 | 0 | Details |
| US2194663A | Telegraphic transmitting device | Expired / Lapsed | 1935-12-28 | 1940-03-26 | 0 | Details |
| US2189541A | Printing telegraph apparatus | Expired / Lapsed | 1938-03-26 | 1940-02-06 | 0 | Details |
| US2179712A | Motor control | Expired / Lapsed | 1937-12-16 | 1939-11-14 | 0 | Details |
| US2177077A | Photoelectric transmitter | Expired / Lapsed | 1935-11-04 | 1939-10-24 | 0 | Details |
| US2152010A | Station selection | Expired / Lapsed | 1936-12-24 | 1939-03-28 | 0 | Details |
| US2148430A | Telegraph selection system | Expired / Lapsed | 1936-10-05 | 1939-02-28 | 0 | Details |
| US2134005A | Selective control system and apparatus | Expired / Lapsed | 1929-09-19 | 1938-10-25 | 0 | Details |
| US2116549A | Telegraph system | Expired / Lapsed | 1935-02-16 | 1938-05-10 | 0 | Details |
| US2095415A | Telephone and printing telegraph signaling system | Expired / Lapsed | 1934-04-14 | 1937-10-12 | 0 | Details |
| US2085120A | Signaling transmitting method and apparatus | Expired / Lapsed | 1930-05-10 | 1937-06-29 | 0 | Details |
| US2082725A | Selective system and apparatus | Expired / Lapsed | 1930-08-14 | 1937-06-01 | 0 | Details |
| US2069240A | Keyboard perforator and counter | Expired / Lapsed | 1932-06-03 | 1937-02-02 | 0 | Details |
| US2057653A | Convertible shift reperforator | Expired / Lapsed | 1933-12-20 | 1936-10-13 | 0 | Details |
| US2046328A | Facsimile printing telegraph system and apparatus | Expired / Lapsed | 1930-08-14 | 1936-07-07 | 0 | Details |
| US2024012A | Selective control system and apparatus | Expired / Lapsed | 1932-12-22 | 1935-12-10 | 0 | Details |
| US2024006A | Keyboard perforator and counter | Expired / Lapsed | 1932-03-25 | 1935-12-10 | 0 | Details |
| US2017091A | Printing telegraph system | Expired / Lapsed | 1934-02-07 | 1935-10-15 | 0 | Details |
| US1973539A | System for displaying intelligence and controlling apparatu… | Expired / Lapsed | 1930-09-15 | 1934-09-11 | 0 | Details |
| US1895718A | Selective signaling and control system | Expired / Lapsed | 1928-04-16 | 1933-01-31 | 0 | Details |
| US1884807A | Keyboard mechanism for telegraph apparatus | Expired / Lapsed | 1930-04-04 | 1932-10-25 | 0 | Details |
| US1864074A | Telegraph signaling system | Expired / Lapsed | 1928-04-02 | 1932-06-21 | 0 | Details |
| US1821110A | Selecting and printing mechanism | Expired / Lapsed | 1929-03-20 | 1931-09-01 | 0 | Details |
| US1811133A | Printing telegraph | Expired / Lapsed | 1927-02-23 | 1931-06-23 | 0 | Details |
| US1769834A | Telegraph sending and writing instrument | Expired / Lapsed | 1926-06-19 | 1930-07-01 | 0 | Details |