Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8907856 | Antenna unit for wireless audio transmission | Matthias Fehr, Sven Dortmund | 2014-12-09 |
| 4633498 | Infrared headphones for the hearing impaired | Egon F. Warnke | 1986-12-30 |