Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5428955 | Device for controlling heating of catalyst for purifying exhaust gas | Hiroshi Tanaka, Kouji Yoshizaki | 1995-07-04 |
| 5271906 | Exhaust emission control apparatus using catalytic converter with hydrocarbon absorbent | Hiroshi Hirayama, Takehisa Yaegashi | 1993-12-21 |
| 5261230 | Device for controlling heating of catalyst for purifying exhaust gas | Hiroshi Tanaka | 1993-11-16 |
| 5191763 | Device for controlling heating of catalyzer for purifying exhaust gas | — | 1993-03-09 |
| 4231336 | Exhaust gas recirculation system for an internal combustion engine | — | 1980-11-04 |
| 4191143 | EGR/Ignition timing control system for an internal combustion engine | — | 1980-03-04 |
| 4191147 | EGR/ignition timing control system for an internal combustion engine | — | 1980-03-04 |