Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5061883 | Braking system for electric railcars including means for controlling electric brake force | Hideo Obi, Shigeya Ohhama | 1991-10-29 |
| 4894745 | Method and apparatus for protecting against semiconductor power control failure | Eiji Akagawa, Hideo Obi | 1990-01-16 |