Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4827472 | Echo canceller using delta modulation | — | 1989-05-02 |
| 4484034 | Anti-larsen-effect arrangement in a telephone station equipped with a loudspeaker | Roger B. J. Hamel, Emmanuel Lefort, Francoise Moliere | 1984-11-20 |
| 4481463 | Current mirror circuit | — | 1984-11-06 |
| 4454384 | Hands free telephone with switchable gain in the two speech signal paths | Yves J. F. Hetet, Jacques Y. Balch | 1984-06-12 |
| 4453039 | Arrangement for avoiding annoying sustained oscillations in a closed-loop system and loud-speaking telephone set employing this arrangement | — | 1984-06-05 |
| 4414434 | Electronic subscriber line interface circuit having means to equalize current through the output differential amplifier | Etienne J. R. Osmond, Yves J. F. Hetet | 1983-11-08 |
| 4386236 | Automatic sound level control of telephone station | Emmanuel Lefort, Francoise Moliere | 1983-05-31 |
| 4356354 | Electronic subscriber junctor | — | 1982-10-26 |
| 4356355 | Apparatus for detecting the closure of a subscriber's line during ringing | Etienne J. R. Osmond, Yves J. F. Hetet | 1982-10-26 |
| 4321430 | Subscriber's connecting network comprising a symmetrical power amplifier for feeding a subscriber's line | — | 1982-03-23 |
| 4275277 | Subscriber line interface circuit for a telephone line | — | 1981-06-23 |
| 4225963 | Arrangement for processing a delta modulation signal, in particular for decoding these signals | — | 1980-09-30 |
| 4211896 | Subscriber's circuit with a symmetrical amplifier | — | 1980-07-08 |
| 4187400 | Time-division multiplex communication system for connecting two-wire line circuits in time-division multiplex | — | 1980-02-05 |
| 4184150 | Circuit arrangement for halving the sampling rate of a delta modulation signal | Pierre L. V. Breant | 1980-01-15 |