Issued Patents 2016
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9447711 | Method for production of valve head portion of hollow engine valve and hollow engine valve | — | 2016-09-20 |
| 9427795 | Method for producing a hollow engine valve | Hirokazu Morii, Kenichiro Hirao, Katsumi Nakamura | 2016-08-30 |
| 9302317 | Method for manufacturing hollow engine valve | Hirokazu Morii, Kenichiro Hirao | 2016-04-05 |