Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5572418 | Quasi-resonant PWM inverter | Toshihisa Shimizu, Akio Toba, Shigeru Sano | 1996-11-05 |
| 5420497 | Direct current power unit having main and secondary direct current power supplies | Osawa Hiroshi, Shigeru Sano | 1995-05-30 |