Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10721567 | Electrodynamic sound transducer | Markus Kuhr, Maik Schäfer | 2020-07-21 |
| 10477293 | Headphone | Axel Grell, Christoph Greger | 2019-11-12 |
| 9930439 | Headphone | Olav Nisse, Alexander Grimm, Christoph Weinreuter, Mirko Hausen | 2018-03-27 |
| 8755554 | Earphone and headset | Jan Peter Kuhtz | 2014-06-17 |
| 6934401 | Closed headphones with transducer system | Axel Grell | 2005-08-23 |