Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10447014 | Spark plug and manufacturing method therefor | Takaaki Kikai, Daisuke Sumoyama | 2019-10-15 |
| 10153621 | Spark plug | Daisuke Sumoyama | 2018-12-11 |
| 9853423 | Spark plug | Daisuke Sumoyama, Tsutomu Shibata, Takaaki Kikai | 2017-12-26 |