Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4920847 | Tuning pin for pianos | — | 1990-05-01 |
| 4674386 | Augmented bass hammer striking distance for pianos | — | 1987-06-23 |
| 4602548 | Tone compensator for piano soundboards | — | 1986-07-29 |
| 4383465 | Space-wrapped strings for musical instruments | — | 1983-05-17 |
| 4381691 | Touch force adjustment means for a piano | Pieter W. van Nuis | 1983-05-03 |
| 4211142 | Sound reflector for grand pianos | — | 1980-07-08 |