Issued Patents All Time
Showing 51–55 of 55 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6744189 | Spark plug | — | 2004-06-01 |
| 6583537 | Spark plug with built-in resistor | Yutaka Tanaka | 2003-06-24 |
| 6566793 | Spark plug | Makoto Sugimoto | 2003-05-20 |
| 6334800 | Manufacturing method of resistor-incorporated spark plug | Kenichi Nishikawa, Yutaka Tanaka, Makoto Sugimoto | 2002-01-01 |
| 6160342 | Resistor-incorporated spark plug and manufacturing method of resistor-incorporated spark plug | Kenichi Nishikawa, Yutaka Tanaka, Makoto Sugimoto | 2000-12-12 |