Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873642 | Method for controlling an oxygen concentration sensor for use in an air/fuel ratio control system of an internal combustion engine | Toshiyuki Mieno, Toyohei Nakajima, Nobuyuki Oono | 1989-10-10 |
| 4819602 | System of abnormality detection for oxygen concentration sensor | Toshiyuki Mieno, Toyohei Nakajima, Nobuyuki Oono | 1989-04-11 |
| 4796587 | Air/fuel ratio control system for internal combustion engine | Toyohei Nakajima | 1989-01-10 |