Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7368644 | Top board structure for keyboard instrument | Eiichi Shirayanagi | 2008-05-06 |
| 7267316 | Brace rotating mechanism | Eiichi Shirayanagi | 2007-09-11 |
| 7140588 | Brace rotating mechanism | Eiichi Shirayanagi | 2006-11-28 |
| 6992242 | Keyboard musical instrument equipped with automatic top board spacer | Eiichi Shirayanagi | 2006-01-31 |
| 6417440 | Damper formed of powder-containing synthetic resin and keyboard musical instrument equipped with the same | — | 2002-07-09 |
| 5811702 | Keyboard musical instrument having hammer heads formed of metallic powder containing synthetic resin and process of fabricating hammer assembly | Yasushi Tomizawa, Hiroyoshi Takahashi, Takamitsu Suzuki | 1998-09-22 |