Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6599095 | Pump-off control method of pump jack | Noriyuki Takada, Takayuki Yamakawa, Hidetoshi Ryu, Tetsuo Kawano, Koji Kawamoto +2 more | 2003-07-29 |
| 6121748 | Method and apparatus for controlling an induction motor | Takayuki Yamakawa | 2000-09-19 |
| 5938052 | Rope steadying control method and apparatus for crane or the like | Takayuki Yamakawa, Tetsuo Kawano, Richard L. Pratt, Frederick C. Lach | 1999-08-17 |