Issued Patents 2017
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9853423 | Spark plug | Daisuke Sumoyama, Takuto Nakada, Tsutomu Shibata | 2017-12-26 |
| 9768588 | Spark plug and manufacturing method therefor | Tomoo Tanaka, Tsutomu Shibata, Kaori Suzuki, Takehito Kuno | 2017-09-19 |