Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9660422 | Spark plug for voltage resistance and suppression of side sparking and oxidation | Reimon Fukuzawa | 2017-05-23 |
| 9124074 | Spark plug reducing metal shell to improve fouling resistance | Tomoaki Ueda, Yuichi Yamada | 2015-09-01 |
| 8970097 | Spark plug for internal combustion engine | Yuichi Yamada, Ryuma Kawachi | 2015-03-03 |
| 8664843 | Spark plug | Yuichi Yamada, Naomichi Miyashita, Jiro Kyuno | 2014-03-04 |
| 8384277 | Spark plug with an identifier | Yuichi Yamada, Takashi Sano | 2013-02-26 |
| 8188642 | Spark plug for internal combustion engine | Kenji Ishida, Yuichi Yamada | 2012-05-29 |
| 8120235 | Spark plug for internal combustion engine and method for manufacturing spark plug | Kenji Nunome, Hiroyuki Kameda, Kazumasa Yoshida | 2012-02-21 |
| 7528534 | Spark plug | Akira Suzuki, Yoshihiro Matsubara, Kazuhiko Mori | 2009-05-05 |
| 6759795 | Spark plug | Kenichi Kumagai, Makoto Yamaguchi | 2004-07-06 |
| 6724133 | Spark plug with nickel alloy electrode base material | Naomichi Miyashita, Yoshihiro Matsubara, Wataru Matsutani, Masayuki Segawa, Mamoru Musasa | 2004-04-20 |
| 6472801 | Spark plug with a corrosion impeding layer | Yoshihiro Matsubara, Shoichiro Ito, Yuji Hirano, Naomichi Miyashita | 2002-10-29 |