Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4469916 | Method and apparatus for detecting signalling and data signals on a telephone channel | Guy de Bergh | 1984-09-04 |
| 4349707 | System for measuring the attenuation on a transmission path | Claude Perrigault | 1982-09-14 |