Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11215091 | Hollow engine valve and manufacturing method therefor | Hirokazu Morii, Kenichiro Hirao | 2022-01-04 |
| 10526933 | Hollow engine valve and manufacturing method therefor | Hirokazu Morii, Kenichiro Hirao | 2020-01-07 |