Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4626226 | Torque fluctuation damper | Hiroyuki Kitajima, Tatsuo Kato | 1986-12-02 |
| 4493381 | Turbodrill with a reduced drilling fluid pressure on a floating piston | Akio Ota | 1985-01-15 |
| 4431100 | Torque fluctuation damper | Hiroyuki Kitajima, Tetsuo Tsuji | 1984-02-14 |