Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5018097 | Modularly structured digital communications system for interconnecting terminal equipment and public networks, and having operation and reliability programs | Klaus Kuhlmann, Siegfried Elstner, Manfred Sonnemann, Franz Schweiger, John Muyssen +1 more | 1991-05-21 |
| 4823374 | Telephone exchange system with performance features activatable from an authorized subscriber station | — | 1989-04-18 |