British Telecommunications PLC
British TeActive Patents
0
Total Holdings
28
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| EP0426269A1 | Mobile communications system | Expired / Lapsed | 1990-04-25 | — | 47 | Details |
| WO1990009073A1 | Telecommunications system | Expired / Lapsed | 1990-01-26 | — | 0 | Details |
| GB1168476A | Improvements in or relating to data transmission systems | Expired / Lapsed | 1966-05-17 | — | 0 | Details |
| GB654313A | Improvements in or relating to electronic counting circuits | Expired / Lapsed | 1948-08-26 | — | 0 | Details |
| US5651095A | Speech synthesis using word parser with knowledge base havi… | Expired / Lapsed | 1994-02-08 | 1997-07-22 | 16 | Details |
| US5435003A | Restoration in communications networks | Expired / Lapsed | 1994-04-04 | 1995-07-18 | 9 | Details |
| US5187362A | Loss detection in a branched optical fiber | Expired / Lapsed | 1989-12-05 | 1993-02-16 | 17 | Details |
| EP0123562B1 | Vehicule route finding system | Expired / Lapsed | 1984-04-26 | 1990-07-18 | 8 | Details |
| US4908867A | Speech synthesis | Expired / Lapsed | 1987-11-19 | 1990-03-13 | 20 | Details |
| US4802727A | Positioning optical components and waveguides | Expired / Lapsed | 1986-10-16 | 1989-02-07 | 14 | Details |
| US4764129A | Electrical connector assemblies | Expired / Lapsed | 1985-10-08 | 1988-08-16 | 10 | Details |
| US4628508A | Computer of processor control systems | Expired / Lapsed | 1985-05-07 | 1986-12-09 | 17 | Details |
| US4560246A | Optical transmission | Expired / Lapsed | 1983-06-02 | 1985-12-24 | 41 | Details |
| US4556980A | Laser light sources | Expired / Lapsed | 1983-02-03 | 1985-12-03 | 24 | Details |
| US4436769A | Metal organic vapor deposition procedure for preparing grou… | Expired / Lapsed | 1981-11-18 | 1984-03-13 | 11 | Details |
| US4355395A | Injection lasers | Expired / Lapsed | 1978-04-10 | 1982-10-19 | 5 | Details |
| US3313939A | Control devices responsive to solar radiation | Expired / Lapsed | 1963-12-17 | 1967-04-11 | 1 | Details |
| US2985716A | Pulse distortion detecting equipment | Expired / Lapsed | 1958-02-14 | 1961-05-23 | 0 | Details |
| US2980765A | Transmission of television signals | Expired / Lapsed | 1954-11-26 | 1961-04-18 | 0 | Details |
| US2885482A | Automatic telephone systems | Expired / Lapsed | 1956-07-09 | 1959-05-05 | 0 | Details |
| US2805286A | Electrical signalling systems | Expired / Lapsed | 1952-07-23 | 1957-09-03 | 0 | Details |
| US2752511A | Electrical timing circuits | Expired / Lapsed | 1951-07-07 | 1956-06-26 | 0 | Details |
| US2718593A | Crystal-controlled electric oscillation generators | Expired / Lapsed | 1950-07-03 | 1955-09-20 | 0 | Details |
| US2612562A | Telegraph distributor | Expired / Lapsed | 1949-06-10 | 1952-09-30 | 0 | Details |
| US2612563A | Telegraph distributor | Expired / Lapsed | 1949-06-10 | 1952-09-30 | 0 | Details |
| US2600873A | Balanced modulator | Expired / Lapsed | 1950-10-23 | 1952-06-17 | 0 | Details |
| US2585079A | Signal generator | Expired / Lapsed | 1950-09-29 | 1952-02-12 | 0 | Details |
| US2581056A | Signal transmission system | Expired / Lapsed | 1949-05-11 | 1952-01-01 | 0 | Details |