Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840027 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | — | 1989-06-20 |
| 4817384 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | Masato Ujino, Takashi Kawase | 1989-04-04 |
| 4811557 | Double air-fuel ratio sensor system having improved exhaust emission characteristics | Takayuki Demura | 1989-03-14 |