Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7154213 | Ground electrode structure of a spark plug for a gas engine | Toshiya Nakamura, Koji Yamanaka, Yoichi Matsushita | 2006-12-26 |
| 4986895 | Process for treating coal tar or coal tar pitch | Makihiko Mori, Katsumi Fujita, Yoshiteru Nakagawa, Toyohiro Maeda | 1991-01-22 |