Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8288928 | Spark plug for internal combustion engine | Kenichi Kumagai, Teruyuki Kondo, Kazuo Yamazaki, Yoshihiro Nakai, Masatada Numano | 2012-10-16 |
| 7825571 | Spark plug for internal combustion engine | Kenichi Kumagai, Teruyuki Kondo, Kazuo Yamazaki, Yoshihiro Nakai, Masatada Numano | 2010-11-02 |
| 5793151 | Creeping discharge spark plug | Junichi Kagawa, Yoshihiro Matsubara | 1998-08-11 |
| 5736809 | Method of making a spark plug including laser welding a noble metal layer to a firing end of electrode | Wataru Matsutani | 1998-04-07 |
| 5680002 | Multi-polarity type spark plug for use in an internal combustion engine | Iwao Kunitomo, Yoshihiro Matsubara | 1997-10-21 |
| 4984905 | Temperature and pressure detecting type spark plug | Yoshihiro Matsubara | 1991-01-15 |
| 4881403 | Spark plug with pressure sensor | Junichi Kagawa, Yoshiaki Saiki | 1989-11-21 |