Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9016253 | Spark plug for internal combustion engine | Katsutoshi Nakayama, Hiroyuki Kameda, Tomoaki Aoki | 2015-04-28 |
| 8648519 | Spark plug for internal combustion engine | Yasushi Sakakura | 2014-02-11 |
| 8640666 | Spark plug for internal combustion engine | Hiroyuki Kameda, Katsutoshi Nakayama, Tomoaki Kato | 2014-02-04 |
| 7781949 | Spark plug | Katsutoshi Nakayama, Hiroyuki Kameda, Yasushi Sakakura | 2010-08-24 |