Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5511071 | Circuit arrangement for setting up conference calls in a digital time-division multiplex telecommunications switching center | — | 1996-04-23 |
| 5414695 | Method for monitoring existing telephone connections, particularly permanently switched telephone connections | Werner Nagler | 1995-05-09 |