Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5738066 | Piston structure with heat insulated combustion chamber | Hiroshi Matsuoka | 1998-04-14 |
| 5664540 | Pre-combustion chamber-type engine | Hiroshi Matsuoka, Keiji Kishishita, Takatoshi Sugano | 1997-09-09 |