Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6388904 | Power supply device for electromotive railcar | — | 2002-05-14 |
| 6084760 | Device for driving self arc-extinguishing type power element | — | 2000-07-04 |
| 5965038 | Control equipment for resistance welding machine | Tatsuaki Ambo, Saburou Souma, Chihiro Okado | 1999-10-12 |
| 5844193 | Control equipment for resistance welding machine | Tatsuaki Ambo, Saburo Souma, Chihiro Okado | 1998-12-01 |
| 5446365 | Method and apparatus for controlling a battery car | Koji Endo, Chihiro Okado | 1995-08-29 |