Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879750 | Hearing aid with cerumen trapping gap | — | 1989-11-07 |
| 4840249 | Apparatus for srewing a cover onto a screw neck of a hearing aid | Ulrich Birkholz, Christof Haertl | 1989-06-20 |
| 4834927 | Method and apparatus for producing an ear impression | Ulrich Birkholz, Christof Haertl | 1989-05-30 |
| 4791819 | Method and apparatus for making comparative acoustic measurements | Bernd Goschke | 1988-12-20 |
| 4763752 | Mount for a sound transducer, particularly an earphone | Christof Haertl | 1988-08-16 |
| 4739512 | Hearing aid | Christof Hartl, Ulrich Birkholz, Hans-Joachim Weiss | 1988-04-19 |