Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4933830 | Switching power supply | Masayoshi Sato, Norikazu Tokunaga, Yasuo Matsuda | 1990-06-12 |
| 4878163 | Pulse width modulated inverter with high-to-low frequency output converter | Ikuo Yamato, Norikazu Tokunaga, Yasuo Matsuda | 1989-10-31 |
| 4866589 | Voltage resonance type switching power source apparatus | Masayoshi Satoo, Norikazu Tokunaga, Teruaki Odaka, Yasuo Matsuda | 1989-09-12 |
| 4855887 | Current and frequency converter having means to reduce switching losses | Ikuo Yamato, Norikazu Tokunaga, Yasuo Matsuda | 1989-08-08 |
| 4777575 | Switching power supply | Ikuo Yamato, Norikazu Tokunaga, Shoichi Noguchi, Teruaki Odaka | 1988-10-11 |
| 4692643 | Semiconductor switching device having plural MOSFET's, GTO's or the like connected in series | Norikazu Tokunaga, Hiroshi Fukui, Kouzou Watanabe, Masayoshi Sato | 1987-09-08 |
| 4646122 | Semiconductor device with floating remote gate turn-off means | Shin Kimura, Hiroshi Fukui, Tsutomu Yatsuo, Saburo Oikawa, Takahiro Nagano | 1987-02-24 |
| 4628684 | Method of piecing a yarn in an open-end spinning machine | Takayuki Morita, Akira Tanaka, Takahiko Tsunekawa | 1986-12-16 |
| 4494371 | Method and apparatus for yarn piecing in a ringless spinning machine | Takayuki Morita, Takahiko Tsunekawa | 1985-01-22 |
| 4479348 | Apparatus for spinning fasciated yarn | Yoshiharu Yasui, Kazuo Seiki, Yoshihisa Suzuki | 1984-10-30 |
| 4456836 | Gate circuit for gate turn-off thyristor | Yasuo Matsuda, Kazuo Honda, Hiroshi Fukui, Shuji Musha | 1984-06-26 |
| 4417156 | Gate circuit for thyristors | Hiroshi Fukui, Shin Kimura, Kenichi Onda | 1983-11-22 |
| 4319317 | D.C. Power supply | Hiroshi Fukui | 1982-03-09 |
| 4306138 | Power supply apparatus for resistance welder including means for preventing polarized transformer excitation | Norikazu Tokunaga, Yorito Jifuku | 1981-12-15 |
| 4298809 | Gate circuit for gate turn-off thyristor | Kenichi Onda | 1981-11-03 |
| 4297594 | Gate circuit for a gate turn-off thyristor | Kenichi Onda, Sadaji Tashiro | 1981-10-27 |
| 4264951 | DC Power transmission control | Hiroo Konishi | 1981-04-28 |