Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5784478 | Audible environment awareness restoring device | — | 1998-07-21 |
| 5687244 | Bone conduction speaker and mounting system | — | 1997-11-11 |
| 5345509 | Transducer with ear canal pickup | Alan Hofer | 1994-09-06 |
| 5163093 | Microphone mounting for a person's neck | Frank Frielingsdorf, Alan Hofer | 1992-11-10 |
| 5054079 | Bone conduction microphone with mounting means | Frank Frielingsdorf, Alan Hofer | 1991-10-01 |