Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4689820 | Hearing aid responsive to signals inside and outside of the audio frequency range | Wolfgang Kopke, Albert Eggert, Peter Wiener, Rainer Maas | 1987-08-25 |
| 4476724 | Audiometer | — | 1984-10-16 |
| 4394627 | Audiometer with photo sensitive, digitally tunable low distortion oscillator | Manfred Muller | 1983-07-19 |