Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10312669 | Spark plug | Daisuke Sumoyama, Tsutomu Shibata | 2019-06-04 |
| 10186845 | Electrode tip for spark plug, and spark plug | Daisuke Sumoyama, Magoki Shimadate, Yusuke KAWASHIMA | 2019-01-22 |