Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11701971 | Three-phase AC motor drive device, rail vehicle equipped with same, and three-phase AC motor drive method | Takeshi Shinomiya, Naoki Kunihiro, Katsumi Ishikawa, Kuniaki Otsuka, Hiroyuki Shirata +4 more | 2023-07-18 |
| 9171831 | Power semiconductor with a Si chip and a wideband chip having matched loss and area ratios | Katsumi Ishikawa | 2015-10-27 |
| 8952642 | Power conversion device and temperature rise calculation method thereof | Hideki Ayano, Katsumi Ishikawa, Tsutomu Kominami, Mami Kunihiro | 2015-02-10 |
| 8860170 | Power semiconductor with a Si chip and a wideband chip having matched loss and area ratios | Katsumi Ishikawa | 2014-10-14 |
| 8829838 | Power converter | Hideki Ayano, Katsumi Ishikawa, Tsutomu Kominami, Mami Kunihiro | 2014-09-09 |
| 8619448 | Power converter and motor driving device using the same | Katsumi Ishikawa | 2013-12-31 |
| 8471622 | Drive circuit of semiconductor device | Katsumi Ishikawa, Masahiro Nagasu | 2013-06-25 |
| 8441075 | Power semiconductor apparatus having a silicon power semiconductor device and a wide gap semiconductor device | Katsumi Ishikawa | 2013-05-14 |
| 8395422 | Drive circuit for switching device | Katsumi Ishikawa | 2013-03-12 |
| 8110944 | Switching circuit and power converter | Katsumi Ishikawa | 2012-02-07 |
| 4819178 | Automatic circuit adjusting system and circuit adjusting tool therefor | Shigeo Isayama | 1989-04-04 |