Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6060654 | Acoustical apparatus sound system | Konstantin L. Valtchev | 2000-05-09 |
| 5780757 | Acoustical ring and bell sound system | Konstantin L. Valtchev | 1998-07-14 |
| D276779 | Music stand accessory tray | — | 1984-12-18 |