Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5204579 | Ceramic insulator for spark plug structure | Takafumi Oshima, Kazuhiko Kozuka | 1993-04-20 |
| 4949006 | Spark plug structure | Takafumi Oshima, Kazuhiko Kozuka | 1990-08-14 |
| 4336477 | Spark plug | — | 1982-06-22 |
| 4288714 | Spark plug for internal combustion engine | Kazumi Kawamura, Shuji Nakamura | 1981-09-08 |