Issued Patents All Time
Showing 1–2 of 2 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 |
| 4400074 | Automatic rewinding camera | Kazuhiko Akiyama, Takeshi Yoshino, Michihiro Shiina, Shigeo Sato, Tetsuo Nishizawa +1 more | 1983-08-23 |