Issued Patents 2019
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10505347 | Spark plug for internal combustion engine | Masamichi Shibata | 2019-12-10 |
| 10431960 | Spark plug for internal combustion engine | Ryuichi Ohno | 2019-10-01 |
| 10348060 | Spark plug | Tomoyuki Watanabe, Ryuichi Ohno | 2019-07-09 |