Western Union Telegraph Co
Western UnActive Patents
0
Total Holdings
86
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3205441A | Frequency shift signaling system | Expired / Lapsed | 1962-10-01 | 1965-09-07 | 2 | Details |
| US3170138A | Character recognition system and apparatus | Expired / Lapsed | 1960-04-21 | 1965-02-16 | 2 | Details |
| US3087010A | Automatic telegraph switching system | Expired / Lapsed | 1960-04-27 | 1963-04-23 | 2 | Details |
| US3012096A | Telegraph tape transmitter distributor | Expired / Lapsed | 1956-01-13 | 1961-12-05 | 0 | Details |
| US3001009A | Telegraph way station selector | Expired / Lapsed | 1957-12-19 | 1961-09-19 | 0 | Details |
| US2794913A | Facsimile recording amplifier | Expired / Lapsed | 1953-01-08 | 1957-06-04 | 0 | Details |
| US2789027A | Multiple stylus | Expired / Lapsed | 1954-03-10 | 1957-04-16 | 0 | Details |
| US2723897A | Stylus scanning devices for facsimile machines | Expired / Lapsed | 1950-07-15 | 1955-11-15 | 0 | Details |
| US2718548A | Variable blanking for facsimile transmitter | Expired / Lapsed | 1953-11-20 | 1955-09-20 | 0 | Details |
| US2641641A | Electronic code telegraph reading and repeating system | Expired / Lapsed | 1949-02-15 | 1953-06-09 | 0 | Details |
| US2611026A | Testing arrangement for automatic telegraph switching system | Expired / Lapsed | 1950-02-04 | 1952-09-16 | 0 | Details |
| US2587253A | Telegraph switching system | Expired / Lapsed | 1948-11-20 | 1952-02-26 | 0 | Details |
| US2575329A | Telegraph switching system | Expired / Lapsed | 1949-08-02 | 1951-11-20 | 0 | Details |
| US2573392A | Carrier telegraph system | Expired / Lapsed | 1947-04-22 | 1951-10-30 | 0 | Details |
| US2546627A | Telegraph switching system | Expired / Lapsed | 1948-07-08 | 1951-03-27 | 0 | Details |
| US2502419A | Electrically actuated recording unit | Expired / Lapsed | 1945-02-03 | 1950-04-04 | 0 | Details |
| US2497859A | Frequency diversity telegraph system | Expired / Lapsed | 1947-11-19 | 1950-02-21 | 0 | Details |
| US2484838A | Telegraph exchange system | Expired / Lapsed | 1940-08-03 | 1949-10-18 | 0 | Details |
| US2435257A | Start-stop electronic regenerative repeater | Expired / Lapsed | 1942-10-17 | 1948-02-03 | 0 | Details |
| US2425019A | System and apparatus for facsimile telegraphy | Expired / Lapsed | 1942-04-04 | 1947-08-05 | 0 | Details |
| US2397559A | Facsimile signal inverter | Expired / Lapsed | 1942-05-16 | 1946-04-02 | 0 | Details |
| US2393329A | Facsimile recorder | Expired / Lapsed | 1940-12-24 | 1946-01-22 | 0 | Details |
| US2392355A | Indicating system | Expired / Lapsed | 1942-10-10 | 1946-01-08 | 0 | Details |
| US2391912A | Electrical recording | Expired / Lapsed | 1941-02-08 | 1946-01-01 | 0 | Details |
| US2375267A | Automatically adjustable recording means | Expired / Lapsed | 1942-02-12 | 1945-05-08 | 0 | Details |
| US2367816A | Radiant energy receiving device | Expired / Lapsed | 1941-10-01 | 1945-01-23 | 0 | Details |
| US2351231A | Automatic facsimile telegraph system | Expired / Lapsed | 1942-07-03 | 1944-06-13 | 0 | Details |
| US2345137A | Telegraph mechanism | Expired / Lapsed | 1942-06-10 | 1944-03-28 | 0 | Details |
| US2341902A | Electronic telegraph repeater | Expired / Lapsed | 1941-08-12 | 1944-02-15 | 0 | Details |
| US2333281A | Electronic regenerative repeater | Expired / Lapsed | 1940-06-14 | 1943-11-02 | 0 | Details |
| US2326298A | Type wheel stop unit | Expired / Lapsed | 1942-07-21 | 1943-08-10 | 0 | Details |
| US2315362A | Facsimile recording apparatus | Expired / Lapsed | 1940-11-13 | 1943-03-30 | 0 | Details |
| US2313238A | Multichannel telegraph system | Expired / Lapsed | 1933-04-13 | 1943-03-09 | 0 | Details |
| US2297851A | Illuminated display device | Expired / Lapsed | 1939-08-03 | 1942-10-06 | 0 | Details |
| US2294149A | Method of and means for recording signals | Expired / Lapsed | 1941-06-07 | 1942-08-25 | 0 | Details |
| US2293704A | Telegraph repeater system | Expired / Lapsed | 1939-10-18 | 1942-08-25 | 0 | Details |
| US2292119A | Adjustable stylus for facsimile recorders | Expired / Lapsed | 1941-02-01 | 1942-08-04 | 0 | Details |
| US2281997A | Submarine cable signal shaping system | Expired / Lapsed | 1940-12-03 | 1942-05-05 | 0 | Details |
| US2279295A | Telegraph exchange system | Expired / Lapsed | 1939-10-14 | 1942-04-14 | 0 | Details |
| US2279242A | Facsimile signal inverter | Expired / Lapsed | 1939-09-02 | 1942-04-07 | 0 | Details |
| US2278919A | Facsimile apparatus | Expired / Lapsed | 1939-03-23 | 1942-04-07 | 0 | Details |
| US2278654A | Inductor alternator | Expired / Lapsed | 1938-12-09 | 1942-04-07 | 0 | Details |
| US2276952A | Wave transmission system | Expired / Lapsed | 1938-11-04 | 1942-03-17 | 0 | Details |
| US2265339A | Facsimile telegraph system | Expired / Lapsed | 1939-10-11 | 1941-12-09 | 0 | Details |
| US2264186A | Telegraph keyboard transmitter | Expired / Lapsed | 1938-08-17 | 1941-11-25 | 0 | Details |
| US2255869A | System and apparatus for facsimile telegraphy | Expired / Lapsed | 1939-03-28 | 1941-09-16 | 0 | Details |
| US2255868A | System and apparatus for facsimile telegraphy | Expired / Lapsed | 1936-11-13 | 1941-09-16 | 0 | Details |
| US2252853A | Web controlled signal | Expired / Lapsed | 1938-07-01 | 1941-08-19 | 0 | Details |
| US2252761A | Relay | Expired / Lapsed | 1938-05-06 | 1941-08-19 | 0 | Details |
| US2238072A | Method and means for locating concealed bodies | Expired / Lapsed | 1938-02-16 | 1941-04-15 | 0 | Details |
| US2227121A | Printing telegraph system | Expired / Lapsed | 1938-03-29 | 1940-12-31 | 0 | Details |
| US2224902A | Electrical terminal and switchboard terminal block | Expired / Lapsed | 1937-06-18 | 1940-12-17 | 0 | Details |
| US2209326A | Facsimile telegraph system | Expired / Lapsed | 1935-07-09 | 1940-07-30 | 0 | Details |
| US2205406A | Multichannel telegraph system | Expired / Lapsed | 1937-07-15 | 1940-06-25 | 0 | Details |
| US2193812A | Telegraph exchange system | Expired / Lapsed | 1936-10-30 | 1940-03-19 | 0 | Details |
| US2193810A | Telegraph exchange system | Expired / Lapsed | 1936-02-24 | 1940-03-19 | 0 | Details |
| US2193809A | Signaling system and apparatus therefor | Expired / Lapsed | 1935-11-25 | 1940-03-19 | 0 | Details |
| US2186897A | Telautograph system | Expired / Lapsed | 1935-09-28 | 1940-01-09 | 0 | Details |
| US2176442A | Signal producing means | Expired / Lapsed | 1935-12-31 | 1939-10-17 | 0 | Details |
| US2174731A | Combined telegraph printer and perforator | Expired / Lapsed | 1935-09-28 | 1939-10-03 | 0 | Details |
| US2172920A | Telegraph system | Expired / Lapsed | 1936-06-26 | 1939-09-12 | 0 | Details |
| US2154441A | Telegraph system | Expired / Lapsed | 1935-06-18 | 1939-04-18 | 0 | Details |
| US2154379A | Method of and apparatus for testing relays | Expired / Lapsed | 1936-05-23 | 1939-04-11 | 0 | Details |
| US2150440A | Magnetic and resonator selector for carrier conveyers | Expired / Lapsed | 1936-06-10 | 1939-03-14 | 0 | Details |
| US2150431A | Capacity selector for carrier conveyer systems | Expired / Lapsed | 1935-05-27 | 1939-03-14 | 0 | Details |
| US2131434A | Sending channel assigner | Expired / Lapsed | 1934-12-11 | 1938-09-27 | 0 | Details |
| US2103761A | Selecting system | Expired / Lapsed | 1930-01-20 | 1937-12-28 | 0 | Details |
| US2062986A | Wire connecting sleeve | Expired / Lapsed | 1935-10-21 | 1936-12-01 | 0 | Details |
| US2048311A | Tape feed for printed strips | Expired / Lapsed | 1928-07-11 | 1936-07-21 | 0 | Details |
| US2034064A | Stock selecting and indicating system | Expired / Lapsed | 1929-11-12 | 1936-03-17 | 0 | Details |
| US2027026A | Control means for telegraph printers and projectors | Expired / Lapsed | 1931-11-25 | 1936-01-07 | 0 | Details |
| US1994949A | Telegraph transmitting apparatus | Expired / Lapsed | 1933-03-23 | 1935-03-19 | 0 | Details |
| US1975367A | Keyboard transmitter | Expired / Lapsed | 1932-08-31 | 1934-10-02 | 0 | Details |
| US1972326A | System for automatically detecting errors in telegraph rece… | Expired / Lapsed | 1933-04-28 | 1934-09-04 | 0 | Details |
| US1966386A | Method and means of transposing signals from one code to an… | Expired / Lapsed | 1932-08-13 | 1934-07-10 | 0 | Details |
| US1958361A | Method of locating faults in cable conductors | Expired / Lapsed | 1931-10-24 | 1934-05-08 | 0 | Details |
| US1945470A | Signal transmitting apparatus | Expired / Lapsed | 1929-12-14 | 1934-01-30 | 0 | Details |
| US1941916A | Combined keyboard transmitter and perforated tape transmitt… | Expired / Lapsed | 1931-11-27 | 1934-01-02 | 0 | Details |
| US1936956A | Combined perforating and printing mechanism | Expired / Lapsed | 1932-05-28 | 1933-11-28 | 0 | Details |
| US1880906A | Multiplex extended channel system | Expired / Lapsed | 1931-07-09 | 1932-10-04 | 0 | Details |
| US1863479A | Rub out signal deleter for tape transmitters | Expired / Lapsed | 1931-08-27 | 1932-06-14 | 0 | Details |
| US1851838A | Tape reperforator | Expired / Lapsed | 1930-07-18 | 1932-03-29 | 0 | Details |
| US1659303A | Connecting block for electric wiring | Expired / Lapsed | 1924-05-23 | 1928-02-14 | 0 | Details |
| US1576167A | Storing transmitter | Expired / Lapsed | 1925-05-09 | 1926-03-09 | 0 | Details |
| US1517110A | Telegraph-transmitting apparatus | Expired / Lapsed | 1922-05-13 | 1924-11-25 | 0 | Details |
| US1394439A | Code-transposing apparatus for telegraph systems | Expired / Lapsed | 1919-01-20 | 1921-10-18 | 0 | Details |