Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5150419 | Calotte-type treble loudspeaker | Ulrich Kizak | 1992-09-22 |
| 4539442 | Loudspeaker | Bernhard Puls, Hermann Gruber, Richard Schonberger, Ulrich Kizak, Max Huttereer | 1985-09-03 |