GPT INTERNATIONAL Ltd
GPT INTERNActive Patents
0
Total Holdings
6
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US4346448A | Generation of electric signals having approximately sinusoi… | Expired / Lapsed | 1979-11-23 | 1982-08-24 | 14 | Details |
| US4306190A | Plural frequency signal generator | Expired / Lapsed | 1979-04-17 | 1981-12-15 | 13 | Details |
| US3980962A | Demodulators | Expired / Lapsed | 1975-02-04 | 1976-09-14 | 9 | Details |
| US3973084A | Electric impulse transmitters for telephone instruments | Expired / Lapsed | 1975-01-14 | 1976-08-03 | 5 | Details |
| US3956596A | Circuit arrangements in telephone apparatus | Expired / Lapsed | 1974-04-10 | 1976-05-11 | 4 | Details |
| US3777268A | Degradation detection in a pcm system | Expired / Lapsed | 1971-09-27 | 1973-12-04 | 11 | Details |