Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5255316 | Hands-free telephone apparatus | Francois Bonneau, Denis Dutey | 1993-10-19 |
| 4488007 | Speech-amplifier telephone station | Andr/e/ Chataignon, Du Phan Tich | 1984-12-11 |
| 4292479 | Separation and balance device for telephone exchanges | Andre Chataignon, Alain Nicolas | 1981-09-29 |