Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881403 | Spark plug with pressure sensor | Yoshiaki Saiki, Kozo Amano | 1989-11-21 |
| 4838218 | Ceramic valve supporting structure in use for internal combustion engine | Yasushi Sato, Shigeru Nagasaki, Masato Taniguchi, Mitsuyoshi Kawamura | 1989-06-13 |
| 4814665 | Center electrode structure for spark plug | Akio Sakura, Mitsutaka Yoshida | 1989-03-21 |
| 4808135 | Center electrode structure for spark plug | Akio Sakura, Mitsutaka Yoshida | 1989-02-28 |