Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4727585 | Adjustable tension support band for headset | — | 1988-02-23 |
| 4701640 | Electret transducer and method of fabrication | Craig Tromborg | 1987-10-20 |
| 4447836 | Recording apparatus for cassette copying | Bill H. Wehrmacher | 1984-05-08 |
| 4216507 | Automatic tape player-changer | James F. Petelle | 1980-08-05 |