Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5769037 | Hollow valve in an internal combustion engine | Kizuku Ohtsubo | 1998-06-23 |
| 5596959 | Shim for a tappet in an internal combustion engine | Akihiro Hamada, Shinichi Umino | 1997-01-28 |
| 5543029 | Properties of the surface of a titanium alloy engine valve | Shinichi Umino, Eiji Hirai, Kazuyoshi Kurosawa, Yoshio Matsumura | 1996-08-06 |
| 5431136 | Internal combustion valve having an iron based hard-facing alloy contact surface | Akihiro Hamada | 1995-07-11 |
| 5370364 | Titanium alloy engine valve shaft structure | Shinichi Umino, Eiji Hirai, Kazuyoshi Kurosawa, Yoshio Matsumura | 1994-12-06 |