Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4639853 | Time-discrete adaptive switching on-off controller | Heinrich Rake, Ulrich Hoffmann, Rudolf Breddermann, Rainer Blumbach | 1987-01-27 |
| 4381488 | Dynamic volume expander varying as a function of ambient noise level | Jobst Fricke | 1983-04-26 |