Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6705648 | Pipe joint | Kazushi Maruyama, Eiji Tsuru | 2004-03-16 |
| 6027145 | Joint for steel pipe having high galling resistance and surface treatment method thereof | Eiji Tsuru, Masaharu Oka, Akira Nakashima, Seijun Higuchi, Ryusuke Inoue +2 more | 2000-02-22 |
| 4421575 | Method of cooling steel pipes | Kyohei Murata, Heiji Morise, Yoichi Yazaki, Kazushi Maruyama, Etuji Kajiki | 1983-12-20 |