Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4839920 | Method for determining telephone dial pulse parameters independently of subscriber line length | Wolfgang Kaiser, Wilhelm Koch, Werner Schmutzler | 1989-06-13 |
| 4691337 | Method and apparatus for determining the value of analog voltages occurring on telephone subscriber lines of a digital telephone exchange | Wolfgang Kaiser, Werner Schmutzler | 1987-09-01 |