Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10186845 | Electrode tip for spark plug, and spark plug | Daisuke Sumoyama, Magoki Shimadate, Yusuke KAWASHIMA | 2019-01-22 |
| 10033163 | Spark plug | Daisuke Sumoyama, Tsutomu Shibata | 2018-07-24 |
| 9705292 | Spark plug and method for producing the same | Daisuke Sumoyama, Tsutomu Shibata | 2017-07-11 |