Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8208651 | Active sound blocker | Sten Boehme, Delf Sachau, Thomas Kletschkowski, Kai Simanowski | 2012-06-26 |
| 7885415 | Device and method for reducing sound of a noise source in narrow frequency ranges | Christian Gerner, Delf Sachau | 2011-02-08 |