Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9000658 | Spark plug for internal combustion engine | Kenji Ban | 2015-04-07 |
| 8047172 | Plasma jet ignition plug | Toru Nakamura, Yuichi Yamada, Yoshikuni Sato, Daisuke Nakano | 2011-11-01 |
| 7663296 | Spark plug for internal combustion engine | Yoshihiro Matsubara, Hironobu Mizutani | 2010-02-16 |
| 5831377 | Spark plug in use for an internal combustion engine | Yoshihiro Matsubara, Wataru Matsutani | 1998-11-03 |
| 5680002 | Multi-polarity type spark plug for use in an internal combustion engine | Yoshihiro Matsubara, Kozo Amano | 1997-10-21 |