Issued Patents 1989
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882695 | Control system for ignition timing and boost pressure in internal combustion engine | Toyohei Nakajima, Akira Nagao | 1989-11-21 |
| 4877511 | Oxygen concentration-sensing device | Toyohei Nakajima | 1989-10-31 |
| 4873642 | Method for controlling an oxygen concentration sensor for use in an air/fuel ratio control system of an internal combustion engine | Toyohei Nakajima, Yasushi Okada, Nobuyuki Oono | 1989-10-10 |
| 4860712 | Method of controlling an oxygen concentration sensor | Toyohei Nakajima | 1989-08-29 |
| 4856480 | Apparatus for controlling ignition timing in internal combustion | Toyohei Nakajima, Akira Tanaka, Akira Nagao, Yukihiko Suzaki | 1989-08-15 |
| 4819602 | System of abnormality detection for oxygen concentration sensor | Toyohei Nakajima, Yasushi Okada, Nobuyuki Oono | 1989-04-11 |
| 4796586 | Method of and apparatus for controlling ignition timing in internal combustion engine | Akira Tanaka, Akira Nagao, Yukihiko Suzaki, Hideji Yamada, Toyohei Nakajima | 1989-01-10 |