Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9885417 | Piston ring | Yoshinari Watanabe, Toshikatsu Hayashi, Ryou Obara | 2018-02-06 |
| 9709169 | Piston ring | Toshikatsu Hayashi, Yoshinari Watanabe, Hayato Sasaki | 2017-07-18 |
| 9285032 | Piston ring | Hayato Sasaki, Takashi Ono, Toshikatsu Hayashi | 2016-03-15 |