Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4918757 | Hearing aid headband support | Gwen V. Janssen | 1990-04-24 |
| 4881616 | Hearing aid retention apparatus | Gwen V. Janssen | 1989-11-21 |
| 4702345 | Hearing aid retention device | Gwen V. Janssen | 1987-10-27 |