Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8288928 | Spark plug for internal combustion engine | Kenichi Kumagai, Kozo Amano, Kazuo Yamazaki, Yoshihiro Nakai, Masatada Numano | 2012-10-16 |
| 7825571 | Spark plug for internal combustion engine | Kenichi Kumagai, Kozo Amano, Kazuo Yamazaki, Yoshihiro Nakai, Masatada Numano | 2010-11-02 |