Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855612 | Switching current and a relay device employed therein | Hirofumi Koga | 1989-08-08 |
| 4772809 | Switching circuit and a relay device employed to prevent arcing | Hirofumi Koga | 1988-09-20 |