Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5470062 | Tennis racket | — | 1995-11-28 |
| 5462274 | Tennis racket with longitudinal strings different in tensile force from transversal strings | — | 1995-10-31 |
| 5310179 | Tennis racket | — | 1994-05-10 |
| 5211398 | Hollow tennis racket frame with matched frequency of vibration | Tetsuyuki Awano | 1993-05-18 |
| 4861029 | Racket frame | — | 1989-08-29 |
| 4811947 | Vibration absorber for a racket | Yoshinori Hariguchi | 1989-03-14 |