Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9000281 | Enhanced vertical piano action system and method | — | 2015-04-07 |
| 5042354 | Action for upright piano | Chris A. Trivelas | 1991-08-27 |
| 4953433 | Action for grand piano | Chris A. Trevelas | 1990-09-04 |
| 4896577 | Action for upright piano | Chris A. Trivelas | 1990-01-30 |