Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9694254 | Golf club head | — | 2017-07-04 |
| 9474944 | Golf club head | — | 2016-10-25 |
| 9017185 | Golf club set | — | 2015-04-28 |
| 8137221 | Racket frame | — | 2012-03-20 |
| 7691016 | Racket | — | 2010-04-06 |
| 7431673 | Racket | Kunio Niwa | 2008-10-07 |
| 7273430 | Tennis racket frame | Kunio Niwa | 2007-09-25 |
| 7217203 | Tennis racket | Hiroyuki Takeuchi | 2007-05-15 |
| 7137912 | Tennis racket | Kunio Niwa | 2006-11-21 |
| 7131920 | Racket frame | — | 2006-11-07 |
| 7074142 | Racket frame | Hiroyuki Takeuchi, Kunio Niwa | 2006-07-11 |
| 7059981 | Racket frame | Kunio Niwa | 2006-06-13 |
| 6688997 | Racket with reduced yoke rigidity | Kunio Niwa, Hiroyuki Takeuchi | 2004-02-10 |
| 6663514 | Racket with vibration damping yoke | Kunio Niwa, Hiroyuki Takeuchi | 2003-12-16 |