Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6997767 | Method for manufacturing a spark plug, and spark plug | Yutaka Taniguchi, Masahide Sumi | 2006-02-14 |
| 6750597 | Method for manufacturing spark plug and spark plug | — | 2004-06-15 |
| 5877584 | Spark plug for an internal combustion engine | Tomoaki Kato, Takahiro Suzuki | 1999-03-02 |
| 4814665 | Center electrode structure for spark plug | Mitsutaka Yoshida, Junichi Kagawa | 1989-03-21 |
| 4808135 | Center electrode structure for spark plug | Mitsutaka Yoshida, Junichi Kagawa | 1989-02-28 |