Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4381488 | Dynamic volume expander varying as a function of ambient noise level | Ulrich Muller | 1983-04-26 |
| 4265157 | Synthetic production of sounds | Wolfgang Voigt, Jürgen Schmitz | 1981-05-05 |
| 4196650 | Combined electronic-pneumatic musical instrument | Wolfgang Geiseler | 1980-04-08 |