Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7238244 | Nitriding of iron and steel parts in salt bath having improved corrosion resistance | Tokuo Sato, Yutaka Sawano, Tetsuya Yamamura, Humihide Nakamura, Motohiro Tenmaya | 2007-07-03 |
| 5543029 | Properties of the surface of a titanium alloy engine valve | Takeji Kenmoku, Shinichi Umino, Eiji Hirai, Yoshio Matsumura | 1996-08-06 |
| 5370364 | Titanium alloy engine valve shaft structure | Takeji Kenmoku, Shinichi Umino, Eiji Hirai, Yoshio Matsumura | 1994-12-06 |
| 5116430 | Process for surface treatment titanium-containing metallic material | Eiji Hirai, Yoshio Matsumura | 1992-05-26 |