Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4572149 | Air/fuel ratio control system for an internal combustion engine | Shumpei Hasegawa, Sadatomo Tsuchiya | 1986-02-25 |
| 4558682 | Air intake side secondary air supply system for an internal combustion engine | Shumpei Hasegawa | 1985-12-17 |