Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870586 | Air-fuel ratio control system for an internal combustion engine with an engine load responsive correction operation | Masahiko Asakura, Takanori Shiina, Masahiro Ueda, Shinichi Kubota, Tomohiko Kawanabe +1 more | 1989-09-26 |
| 4818362 | Oxygen concentration sensing apparatus | Masahiko Asakura, Tomohiko Kawanabe, Shin'ichi Kubota, Katsuhiko Kimura, Yasunari Seki +1 more | 1989-04-04 |
| 4804454 | Oxygen concentration sensing apparatus | Masahiko Asakura, Yasunari Seki, Takanori Shiina | 1989-02-14 |