Issued Patents 1989
Showing 1–1 of 1 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 |
Showing 1–1 of 1 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 |