Issued Patents 2020
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10541517 | Spark plug for internal combustion engine and method for manufacturing the same | Teiji Ishinada, Ryuichi Ohno | 2020-01-21 |
| 10530132 | Spark plug for internal combustion engine and method for manufacturing the same | Ryuichi Ohno | 2020-01-07 |