Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845702 | Optical telecommunication package switching system using asynchronous techniques | — | 1989-07-04 |
| 4528425 | Method of and circuitry for detecting, at a telephone exchange, the lifting of a subscriber's handset in response to ringing current emitted by the exchange | Mario Sartori | 1985-07-09 |
| 4362908 | Circuit arrangement for emitting ringing signals in a telephone system | — | 1982-12-07 |
| 4287392 | Integrated circuitry for exchanging signals between telephone station and central office | — | 1981-09-01 |
| 4185172 | Method of and means for detecting digitized multi frequency-coded signals | Renato Rocci | 1980-01-22 |