Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4728807 | Power source system comprising a plurality of power sources having negative resistance characteristics | Hideki Yamamoto, Tsutomu Ogata | 1988-03-01 |
| 4644458 | Electric power supply circuit capable of reducing a loss of electric power | Hideki Yamamoto, Katsuhiko Yamamoto | 1987-02-17 |