Issued Patents 2018
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9970242 | Galling resistant drill pipe tool joint and corresponding drill pipe | Tomoyuki Narikawa, Tatsuo Ono, Koji Sakura, Toshihiko Fukui, Motohisa Yoshida +2 more | 2018-05-15 |