Issued Patents 2003
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6590317 | Spark plug | Yoshihide Kouge, Makoto Sugimoto | 2003-07-08 |
| 6590318 | Spark plug having a reduced lead glaze layer on the insulator thereof | Makoto Sugimoto | 2003-07-08 |
| 6566792 | Spark plug | — | 2003-05-20 |