Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5204917 | Modular hearing aid | Horst Arndt, Terrence D. Spencer, Fred J. Stork | 1993-04-20 |
| 5201008 | Modular hearing aid with lid hinged to faceplate | Horst Arndt | 1993-04-06 |
| 5008943 | Modular hearing aid with lid hinged to faceplate | Horst Arndt | 1991-04-16 |