Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5289538 | Circuit arrangement for signal and information conversion between analog junction lines and digital terminal devices in communications exchanges | Walter Lauer, Gerd Ponitz | 1994-02-22 |
| 4991167 | Voice controlled attenuation adjustment in telephone transmission circuits | Eberhard Hansler, Birger Hatty | 1991-02-05 |