Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10541517 | Spark plug for internal combustion engine and method for manufacturing the same | Kenji Hattori, Ryuichi Ohno | 2020-01-21 |
| 7605526 | Spark plug for internal combustion engine | Tsunenobu Hori | 2009-10-20 |
| 6720716 | Spark plug and method for manufacturing the same | Masamichi Shibata, Hiromi Hiramatsu | 2004-04-13 |