Telephone Manufacturing Co Ltd
TelephoneActive Patents
0
Total Holdings
11
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| GB757025A | Improvements in automatic telephone exchange systems | Expired / Lapsed | 1953-06-15 | — | 0 | Details |
| GB749633A | Improvements relating to electric socket connectors and oth… | Expired / Lapsed | 1953-06-12 | — | 0 | Details |
| US3588548A | Digital low pass filters | Expired / Lapsed | 1969-01-21 | 1971-06-28 | 0 | Details |
| US2907930A | Signal detectors | Expired / Lapsed | 1956-03-08 | 1959-10-06 | 0 | Details |
| US2898241A | Manufacturing processes | Expired / Lapsed | 1956-12-04 | 1959-08-04 | 2 | Details |
| US2852621A | Voice switching in telephone transmission systems | Expired / Lapsed | 1952-11-18 | 1958-09-16 | 0 | Details |
| US2740944A | Mounting arrangements for electrical apparatus | Expired / Lapsed | 1951-10-10 | 1956-04-03 | 0 | Details |
| US2702319A | Two-way telecommunication system | Expired / Lapsed | 1952-05-20 | 1955-02-15 | 0 | Details |
| US2672599A | Electric selecting device responsive to impulses | Expired / Lapsed | 1952-03-24 | 1954-03-16 | 0 | Details |
| US2511468A | Electrical control network | Expired / Lapsed | 1946-01-09 | 1950-06-13 | 0 | Details |
| US2482932A | Electrical testing and indicating system | Expired / Lapsed | 1947-07-29 | 1949-09-27 | 0 | Details |