Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11598247 | Two-stroke internal combustion engine | Hisato Onodera, Ken Shirai, Koichirou Ogura | 2023-03-07 |
| 10927789 | Stratified scavenging engine and portable work machine | Shiro Yamaguchi, Ken Shirai | 2021-02-23 |