Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9397482 | Spark plug for internal combustion engine | — | 2016-07-19 |
| 8841825 | Spark plug designed to increase service life thereof | — | 2014-09-23 |
| 8810119 | Spark plug for an internal combustion engine | Toshikazu Shimizu | 2014-08-19 |