Western Union Telegraph Co
Western UnActive Patents
0
Total Holdings
152
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US3660606A | Method and apparatus for time division multiplex transmissi… | Expired / Lapsed | 1970-04-28 | 1972-05-02 | 17 | Details |
| US3404338A | Method and means for measuring and correcting delay and att… | Expired / Lapsed | 1965-02-24 | 1968-10-01 | 0 | Details |
| 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 |
| US3147342A | Synchronous adapter | Expired / Lapsed | 1961-03-29 | 1964-09-01 | 2 | Details |
| US3147380A | Nuclear bomb explosion detecting device | Expired / Lapsed | 1960-05-26 | 1964-09-01 | 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 |
| US2966633A | Delay and amplitude corrective system | Expired / Lapsed | 1958-08-12 | 1960-12-27 | 0 | Details |
| US2843756A | Optical scanning apparatus for facsimile transmitters | Expired / Lapsed | 1951-07-06 | 1958-07-15 | 0 | Details |
| US2803792A | Motor stabilizer | Expired / Lapsed | 1956-05-28 | 1957-08-20 | 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 |
| US2767243A | Magnetic tape storage of intelligence | Expired / Lapsed | 1951-07-02 | 1956-10-16 | 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 |
| US2715202A | Electric motor speed regulation | Expired / Lapsed | 1951-09-07 | 1955-08-09 | 0 | Details |
| US2687935A | Signal amplifying system for electrically actuated recordin… | Expired / Lapsed | 1948-02-10 | 1954-08-31 | 0 | Details |
| US2641641A | Electronic code telegraph reading and repeating system | Expired / Lapsed | 1949-02-15 | 1953-06-09 | 0 | Details |
| US2632044A | Telegraph reperforator switching system | Expired / Lapsed | 1946-07-08 | 1953-03-17 | 0 | Details |
| US2628342A | Inductance coil | Expired / Lapsed | 1945-09-25 | 1953-02-10 | 0 | Details |
| US2611026A | Testing arrangement for automatic telegraph switching system | Expired / Lapsed | 1950-02-04 | 1952-09-16 | 0 | Details |
| US2607654A | Stylus assembly for facsimile recorders | Expired / Lapsed | 1949-01-15 | 1952-08-19 | 0 | Details |
| US2592779A | Tape controlled telegraph transmitter | Expired / Lapsed | 1945-10-26 | 1952-04-15 | 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 |
| US2485551A | Signal controlled selector | Expired / Lapsed | 1944-08-29 | 1949-10-25 | 0 | Details |
| US2484838A | Telegraph exchange system | Expired / Lapsed | 1940-08-03 | 1949-10-18 | 0 | Details |
| US2453118A | Concentrated arc discharge device | Expired / Lapsed | 1946-05-08 | 1948-11-09 | 0 | Details |
| US2435257A | Start-stop electronic regenerative repeater | Expired / Lapsed | 1942-10-17 | 1948-02-03 | 0 | Details |
| US2435260A | Sheet feeder for facsimile telegraph apparatus | Expired / Lapsed | 1942-10-03 | 1948-02-03 | 0 | Details |
| US2435259A | Frequency control apparatus | Expired / Lapsed | 1942-09-30 | 1948-02-03 | 0 | Details |
| US2425019A | System and apparatus for facsimile telegraphy | Expired / Lapsed | 1942-04-04 | 1947-08-05 | 0 | Details |
| US2400544A | Conductive paper | Expired / Lapsed | 1944-10-24 | 1946-05-21 | 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 |
| US2384515A | Signal recording apparatus | Expired / Lapsed | 1943-01-13 | 1945-09-11 | 0 | Details |
| US2375820A | Adjustable stylus for facsimile recorders | Expired / Lapsed | 1942-02-11 | 1945-05-15 | 0 | Details |
| US2375267A | Automatically adjustable recording means | Expired / Lapsed | 1942-02-12 | 1945-05-08 | 0 | Details |
| US2374214A | Conductive papers | Expired / Lapsed | 1939-07-27 | 1945-04-24 | 0 | Details |
| US2367816A | Radiant energy receiving device | Expired / Lapsed | 1941-10-01 | 1945-01-23 | 0 | Details |
| US2363270A | Facsimile telegraph system | Expired / Lapsed | 1942-10-03 | 1944-11-21 | 0 | Details |
| US2351231A | Automatic facsimile telegraph system | Expired / Lapsed | 1942-07-03 | 1944-06-13 | 0 | Details |
| US2346173A | Transmission system | Expired / Lapsed | 1942-01-29 | 1944-04-11 | 0 | Details |
| US2345628A | Multichannel telegraph system | Expired / Lapsed | 1942-01-28 | 1944-04-04 | 0 | Details |
| US2345137A | Telegraph mechanism | Expired / Lapsed | 1942-06-10 | 1944-03-28 | 0 | Details |
| US2343297A | Telegraph system and apparatus | Expired / Lapsed | 1942-03-07 | 1944-03-07 | 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 |
| US2308306A | Printing telegraph apparatus | Expired / Lapsed | 1940-06-18 | 1943-01-12 | 0 | Details |
| US2304775A | Telegraph switching system | Expired / Lapsed | 1940-08-03 | 1942-12-15 | 0 | Details |
| US2301024A | Method of and apparatus for preparing facsimile master copi… | Expired / Lapsed | 1940-11-01 | 1942-11-03 | 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 |
| US2294146A | Electrosensitive recording blank | Expired / Lapsed | 1939-01-27 | 1942-08-25 | 0 | Details |
| US2293155A | Coaxial cable | Expired / Lapsed | 1939-08-07 | 1942-08-18 | 0 | Details |
| US2292119A | Adjustable stylus for facsimile recorders | Expired / Lapsed | 1941-02-01 | 1942-08-04 | 0 | Details |
| US2291369A | Polar carrier telegraph system | Expired / Lapsed | 1941-11-21 | 1942-07-28 | 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 |
| US2259517A | Tape accumulator | Expired / Lapsed | 1939-04-06 | 1941-10-21 | 0 | Details |
| US2257828A | Multitape telegraph receiver | Expired / Lapsed | 1940-02-09 | 1941-10-07 | 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 |
| US2254814A | Telegraph signal storage apparatus | Expired / Lapsed | 1939-12-09 | 1941-09-02 | 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 |
| US2248857A | Automatic bias corrector | Expired / Lapsed | 1938-09-20 | 1941-07-08 | 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 |
| US2216545A | System for eliminating crossfire in telegraphic circuits | Expired / Lapsed | 1938-03-30 | 1940-10-01 | 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 |
| US2181533A | Method of and means for recording signals electrically | Expired / Lapsed | 1936-01-18 | 1939-11-28 | 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 |
| US2173741A | Electrostatic recording mechanism | Expired / Lapsed | 1935-06-14 | 1939-09-19 | 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 |
| US2149223A | Electrical cable | Expired / Lapsed | 1936-04-15 | 1939-02-28 | 0 | Details |
| US2149209A | Wire connecting sleeve | Expired / Lapsed | 1935-11-14 | 1939-02-28 | 0 | Details |
| US2147249A | Telegraph transmitting apparatus | Expired / Lapsed | 1937-05-15 | 1939-02-14 | 0 | Details |
| US2135377A | Telegraph transmitter | Expired / Lapsed | 1935-08-22 | 1938-11-01 | 0 | Details |
| US2131434A | Sending channel assigner | Expired / Lapsed | 1934-12-11 | 1938-09-27 | 0 | Details |
| US2131424A | Selective voice frequency relay | Expired / Lapsed | 1934-05-08 | 1938-09-27 | 0 | Details |
| US2128671A | System of selector control for carrier conveyers | Expired / Lapsed | 1935-05-27 | 1938-08-30 | 0 | Details |
| US2122367A | Telegraph switching system | Expired / Lapsed | 1932-01-08 | 1938-06-28 | 0 | Details |
| US2109989A | Telegraph transmitting system | Expired / Lapsed | 1934-11-28 | 1938-03-01 | 0 | Details |
| US2106693A | Home record cut-out assembly | Expired / Lapsed | 1935-09-05 | 1938-01-25 | 0 | Details |
| US2103761A | Selecting system | Expired / Lapsed | 1930-01-20 | 1937-12-28 | 0 | Details |
| US2074066A | Motor operated indicator dial | Expired / Lapsed | 1930-04-11 | 1937-03-16 | 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 |
| US2046977A | Indicator dial operating mechanism | Expired / Lapsed | 1930-04-11 | 1936-07-07 | 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 |
| US2018102A | Oscillatory grid-controlled detector or relay | Expired / Lapsed | 1933-12-20 | 1935-10-22 | 0 | Details |
| US2014926A | Oven heat cycle regulator | Expired / Lapsed | 1932-05-28 | 1935-09-17 | 0 | Details |
| US2006305A | Carrier dispatch system | Expired / Lapsed | 1932-01-08 | 1935-06-25 | 0 | Details |
| US1996403A | Frequency control | Expired / Lapsed | 1932-01-23 | 1935-04-02 | 0 | Details |
| US1994949A | Telegraph transmitting apparatus | Expired / Lapsed | 1933-03-23 | 1935-03-19 | 0 | Details |
| US1992401A | Display device | Expired / Lapsed | 1933-06-15 | 1935-02-26 | 0 | Details |
| US1986768A | Multichannel telegraph printer | Expired / Lapsed | 1932-12-13 | 1935-01-01 | 0 | Details |
| US1976398A | Electrical selecting and indicating system | Expired / Lapsed | 1929-11-11 | 1934-10-09 | 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 |
| US1949878A | Platen for tape printing machines | Expired / Lapsed | 1931-12-19 | 1934-03-06 | 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 |
| US1881757A | Telegraph transmitting apparatus | Expired / Lapsed | 1931-10-23 | 1932-10-11 | 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 |
| US1815786A | Printing telegraph control circuit | Expired / Lapsed | 1928-12-31 | 1931-07-21 | 0 | Details |
| US1814947A | Automatic selective pneumatic tube carrier relay | Expired / Lapsed | 1930-07-30 | 1931-07-14 | 0 | Details |
| US1814902A | Telegraph system for dividing received intelligence into gr… | Expired / Lapsed | 1930-01-31 | 1931-07-14 | 0 | Details |
| US1659303A | Connecting block for electric wiring | Expired / Lapsed | 1924-05-23 | 1928-02-14 | 0 | Details |
| US1607473A | Duplexing loaded submarine cable | Expired / Lapsed | 1925-01-22 | 1926-11-16 | 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 |
| US1487691A | Telegraph synchronizing system | Expired / Lapsed | 1924-02-15 | 1924-03-18 | 0 | Details |
| US1394439A | Code-transposing apparatus for telegraph systems | Expired / Lapsed | 1919-01-20 | 1921-10-18 | 0 | Details |
| US1378712A | Amplifier | Expired / Lapsed | 1918-01-17 | 1921-05-17 | 0 | Details |
| US1355085A | Differentially-wound electromagnet | Expired / Lapsed | 1918-07-13 | 1920-10-05 | 0 | Details |