Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4918757 | Hearing aid headband support | Roy C. Rowland | 1990-04-24 |
| 4881616 | Hearing aid retention apparatus | Roy C. Rowland | 1989-11-21 |
| 4702345 | Hearing aid retention device | Roy C. Rowland | 1987-10-27 |
| 4380004 | Emergency sound detector device | Montgomery R. Coats | 1983-04-12 |