Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11719138 | Sintered alloy valve guide and method of producing sintered alloy valve guide | Fumiya Ito | 2023-08-08 |
| 10036287 | Valve seat | Yoshio Koyama | 2018-07-31 |
| 9581056 | Valve seat | Yoshio Koyama, Fusanobu Hanada | 2017-02-28 |
| 9556761 | Valve seat | Yoshio Koyama | 2017-01-31 |