Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10648398 | Intake structure of internal combustion engine | Akira Yoshihara, Koichi Matsumoto, Shigeki Nabetani, Kazuaki Koyama | 2020-05-12 |
| 10227947 | Cylinder head for vehicle engine | Kazuaki Koyama, Akira Yoshihara, Norio Takayasu, Genki Takahashi | 2019-03-12 |