Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11486458 | Clutch unit | Kengo Watanabe, Yasumasa Hibi | 2022-11-01 |
| 11231091 | Chain tensioner | Kouichi Onimaru | 2022-01-25 |
| 9677649 | Hydraulic auto-tensioner | Satoshi Kitano, Tadahisa Tanaka | 2017-06-13 |
| 8684122 | Power assisted bicycle with regenerative function | Kiyohiro Ito | 2014-04-01 |
| 8181615 | Lash adjuster for swing arm type valve gear | — | 2012-05-22 |
| 8136493 | Lash adjuster | Katsuhisa Yamaguchi, Hiroshi Bunko | 2012-03-20 |
| 7571632 | Chain Tensioner | Ken Yamamoto | 2009-08-11 |
| 7189174 | Chain tensioner | Ken Yamamoto | 2007-03-13 |
| 7036475 | Lash adjuster for valve gear | Yoshiteru Yasuda, Kenshi Ushijima, Ken Yamamoto | 2006-05-02 |
| 7013855 | Lash adjuster for valve actuator | Ken Yamamoto | 2006-03-21 |
| 6901896 | Arm type valve gear | Ken Yamamoto | 2005-06-07 |
| 6729288 | Lash adjuster for use in valve gear | Ken Yamamoto | 2004-05-04 |