Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831838 | Double air-fuel ratio sensor system carrying out learning control operation | Takatoshi Masui, Yasushi Satou, Toshiyasu Katsuno | 1989-05-23 |
| 4823270 | Method and apparatus for controlling air-fuel ratio in internal combustion engine | — | 1989-04-18 |
| 4819427 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | Takatoshi Masui, Toshiyasu Katsuno | 1989-04-11 |
| 4809501 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | Nobuaki Kayanuma | 1989-03-07 |
| 4796425 | Double air-fuel ratio sensor system carrying out learning control operation | Nobuaki Kayanuma | 1989-01-10 |