Issued Patents All Time
Showing 51–53 of 53 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7150252 | Spark plug and internal combustion engine equipped with the spark plug | Katsutoshi Nakayama, Takeru Wakamatsu | 2006-12-19 |
| 6798125 | Spark plug having ground electrode made of NI alloy and noble metal wear resistant portion | Yoshitaka Sugiura | 2004-09-28 |
| 6603244 | Spark plug and method of producing spark plug | Tomoharu Suzuki, Kenichi Kumagai | 2003-08-05 |