Patent Explorer
Browse, filter, and analyze 87 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US3205441A | Frequency shift signaling system | Western Union Telegraph Co | Expired / Lapsed | 1962-10-01 | 1965-09-07 | 1982-10-01 | 0.0 yrs | 2 | |
| US3170138A | Character recognition system and apparatus | Western Union Telegraph Co | Expired / Lapsed | 1960-04-21 | 1965-02-16 | 1980-04-21 | 0.0 yrs | 2 | |
| US3087010A | Automatic telegraph switching system | Western Union Telegraph Co | Expired / Lapsed | 1960-04-27 | 1963-04-23 | 1980-04-27 | 0.0 yrs | 2 | |
| US3012096A | Telegraph tape transmitter distributor | Western Union Telegraph Co | Expired / Lapsed | 1956-01-13 | 1961-12-05 | 1976-01-13 | 0.0 yrs | 0 | |
| US3001009A | Telegraph way station selector | Western Union Telegraph Co | Expired / Lapsed | 1957-12-19 | 1961-09-19 | 1977-12-19 | 0.0 yrs | 0 | |
| US2794913A | Facsimile recording amplifier | Western Union Telegraph Co | Expired / Lapsed | 1953-01-08 | 1957-06-04 | 1973-01-08 | 0.0 yrs | 0 | |
| US2789027A | Multiple stylus | Western Union Telegraph Co | Expired / Lapsed | 1954-03-10 | 1957-04-16 | 1974-03-10 | 0.0 yrs | 0 | |
| US2723897A | Stylus scanning devices for facsimile machines | Western Union Telegraph Co | Expired / Lapsed | 1950-07-15 | 1955-11-15 | 1970-07-15 | 0.0 yrs | 0 | |
| US2718548A | Variable blanking for facsimile transmitter | Western Union Telegraph Co | Expired / Lapsed | 1953-11-20 | 1955-09-20 | 1973-11-20 | 0.0 yrs | 0 | |
| US2641641A | Electronic code telegraph reading and repeating system | Western Union Telegraph Co | Expired / Lapsed | 1949-02-15 | 1953-06-09 | 1969-02-15 | 0.0 yrs | 0 | |
| US2611026A | Testing arrangement for automatic telegraph switching system | Western Union Telegraph Co | Expired / Lapsed | 1950-02-04 | 1952-09-16 | 1970-02-04 | 0.0 yrs | 0 | |
| US2587253A | Telegraph switching system | Western Union Telegraph Co | Expired / Lapsed | 1948-11-20 | 1952-02-26 | 1968-11-20 | 0.0 yrs | 0 | |
| US2575329A | Telegraph switching system | Western Union Telegraph Co | Expired / Lapsed | 1949-08-02 | 1951-11-20 | 1969-08-02 | 0.0 yrs | 0 | |
| US2573392A | Carrier telegraph system | Western Union Telegraph Co | Expired / Lapsed | 1947-04-22 | 1951-10-30 | 1967-04-22 | 0.0 yrs | 0 | |
| US2546627A | Telegraph switching system | Western Union Telegraph Co | Expired / Lapsed | 1948-07-08 | 1951-03-27 | 1968-07-08 | 0.0 yrs | 0 | |
| US2502419A | Electrically actuated recording unit | Western Union Telegraph Co | Expired / Lapsed | 1945-02-03 | 1950-04-04 | 1965-02-03 | 0.0 yrs | 0 | |
| US2497859A | Frequency diversity telegraph system | Western Union Telegraph Co | Expired / Lapsed | 1947-11-19 | 1950-02-21 | 1967-11-19 | 0.0 yrs | 0 | |
| US2484838A | Telegraph exchange system | Western Union Telegraph Co | Expired / Lapsed | 1940-08-03 | 1949-10-18 | 1960-08-03 | 0.0 yrs | 0 | |
| US2435257A | Start-stop electronic regenerative repeater | Western Union Telegraph Co | Expired / Lapsed | 1942-10-17 | 1948-02-03 | 1962-10-17 | 0.0 yrs | 0 | |
| US2425019A | System and apparatus for facsimile telegraphy | Western Union Telegraph Co | Expired / Lapsed | 1942-04-04 | 1947-08-05 | 1962-04-04 | 0.0 yrs | 0 |
Showing 1 to 20 of 87 patents
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