Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5442695 | Ringer circuit | Artur Bardl | 1995-08-15 |
| 5402017 | Controllable circuit configuration for compensating fluctuations in an amplifier | Artur Bardl, Manfred Lindner | 1995-03-28 |
| 4894863 | Method for gain control in telephone sets having an electronic speech circuit, and apparatus for performing the method | Armin Doll | 1990-01-16 |
| 4847898 | Speech circuit configuration | Armin Doll | 1989-07-11 |