Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6617706 | Ignition system | Yoshihiro Matsubara, Akio Kokubu, Kazumasa Yoshida, Makoto Yamaguchi, Kazuya Iwata +1 more | 2003-09-09 |
| 6472801 | Spark plug with a corrosion impeding layer | Yoshihiro Matsubara, Yuji Hirano, Naomichi Miyashita, Hiroaki Kuki | 2002-10-29 |
| 6326720 | Spark plug and ignition system for use with internal combustion engine | Yoshihiro Matsubara | 2001-12-04 |
| D254912 | Fountain pen | — | 1980-05-06 |
| D254913 | Fountain pen nib | — | 1980-05-06 |