Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844038 | Abnormality detecting method for exhaust gas concentration sensor for internal combustion engines | Masahiko Yakuwa | 1989-07-04 |
| 4840156 | Intake air quality control method for internal combustion engines at termination of fuel cut operation | Makoto Hashiguchi | 1989-06-20 |