Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840146 | Multiple throttle mechanism for internal combustion engines | Sigeo Tamaki, Isamu Ishizawa | 1989-06-20 |
| 4782805 | Control device for throttle valve for internal combustion engine | Hirotoshi Kawano, Tadao Osawa, Toshifumi Usui, Yutaka Takaku | 1988-11-08 |
| 4723443 | Intake air flow sensor | Toshifumi Usui, Tadao Osawa | 1988-02-09 |
| 4615173 | Exhaust emission control apparatus for diesel engine | Toshifumi Usui | 1986-10-07 |