Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6771009 | Spark plug | Kenichi Nishikawa, Makoto Sugimoto | 2004-08-03 |
| 6744188 | Spark plug | Kenichi Nishikawa | 2004-06-01 |
| 6590317 | Spark plug | Kenichi Nishikawa, Makoto Sugimoto | 2003-07-08 |