Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5709185 | Lubricating system for four-stroke-cycle engine | Shigemitsu Aizawa, Toshio Hirabayashi | 1998-01-20 |
| 5582145 | Four-stroke-cycle engine | Shigemitsu Aizawa, Yuichi Momose | 1996-12-10 |