Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8866370 | Spark plug | Tsutomu Shibata, Takaaki Kikai, Osamu Yoshimoto | 2014-10-21 |
| 8664842 | Spark plug | Tomoo Tanaka, Tsutomu Shibata, Osamu Yoshimoto, Takaaki Kikai, Takehito Kuno | 2014-03-04 |
| 8410674 | Spark plug with a center electrode having a space-forming portion | — | 2013-04-02 |
| 8288929 | Spark plug | Yoshikuni Sato | 2012-10-16 |
| 8283846 | Spark plug containing specific ratio content | Tsutomu Shibata, Takehito Kuno, Tomoo Tanaka, Shoichiro Nagatomo | 2012-10-09 |
| 8242673 | Spark plug | — | 2012-08-14 |
| 8164242 | Spark plug | Osamu Yoshimoto, Yoshihiro Nakai, Taichiro Nishikawa, Toru Tanji, Kazuo Yamazaki | 2012-04-24 |
| 8164243 | Spark plug for internal combustion engine | Yoshikuni Sato | 2012-04-24 |
| 8129891 | Spark plug | — | 2012-03-06 |
| 8120235 | Spark plug for internal combustion engine and method for manufacturing spark plug | Hiroaki Kuki, Hiroyuki Kameda, Kazumasa Yoshida | 2012-02-21 |
| 7432641 | Spark plug | — | 2008-10-07 |
| 7382084 | Spark plug having a precious metal tip | Osamu Yoshimoto, Wataru Matsutani, Yoshihiro Matsubara | 2008-06-03 |
| 7279827 | Spark plug with electrode including precious metal | Osamu Yoshimoto, Wataru Matsutani, Yoshihiro Matsubara | 2007-10-09 |
| 7038363 | Spark plug with marking layer composition | — | 2006-05-02 |
| 6559579 | Alumina-based sintered body insulator for spark plugs | Hirohito Ito, Makoto Sugimoto, Kuniharu Tanaka, Katsura Matsubara, Yoshihiro Yamamoto +1 more | 2003-05-06 |