Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4500756 | Keyboard switch having a deformable membrane formed of cellular urethane | Frederick C. Feagans | 1985-02-19 |
| 4418605 | Keyboard for musical instrument | Kjell T. Tollefsen | 1983-12-06 |