Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4953207 | Electronic telephone set | Philippe Jouen, Petrus J. M. Sijbers | 1990-08-28 |
| 4811391 | Telephone set comprising a line voltage stabilizer having a DC supply point | Peter J. M. Sijbers | 1989-03-07 |
| 4585909 | Transmission circuit for a DTMF-telephone set | Henricus J. M. Otten, Josephus Joannes Antonius Geboers | 1986-04-29 |
| 4370526 | Arrangement for applying a ringing voltage to a subscriber's line | Franciscus A. C. M. Schoofs, Aloysius J. Nijman | 1983-01-25 |