Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7270091 | Cooling water passage structure for an engine | Satoshi Matsui, Toshihiko Oka, Yoshinori Sakurai, Akimasa Yamamoto | 2007-09-18 |
| 7152566 | Cylinder head structure | Satoshi Matsui, Toshihiko Oka, Yoshinori Sakurai, Tetsushi Nagira, Kenichi Morishima | 2006-12-26 |
| 6959675 | Valve system for internal combustion engine | Shuji Nagano, Toshihiko Oka | 2005-11-01 |
| 6644754 | Tunnel excavating machine | — | 2003-11-11 |
| 4392659 | Two-wheeled roller skate | — | 1983-07-12 |
| D262130 | Roller skate | — | 1981-12-01 |
| 4212479 | Roller skate | — | 1980-07-15 |