Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831838 | Double air-fuel ratio sensor system carrying out learning control operation | Toshinari Nagai, Yasushi Satou, Toshiyasu Katsuno | 1989-05-23 |
| 4819427 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | Toshinari Nagai, Toshiyasu Katsuno | 1989-04-11 |
| 4817383 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | — | 1989-04-04 |