Issued Patents All Time
Showing 1–25 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11509242 | Power conversion apparatus | Koji Maki | 2022-11-22 |
| 11305992 | Ozone generation device and power supply for ozone generation device | Takaaki Murata, Yuji Okita, Michiko Hashimoto, Kie Kubo | 2022-04-19 |
| 10938319 | Power conversion apparatus | Koji Maki, Yushi Koyama, Shunsuke Tamada, Takuro Arai, Ryuichi Morikawa +1 more | 2021-03-02 |
| 10381842 | Power supply system | Koji Maki, Makoto Kumai, Hiroaki Matsumoto, Shingo Yanagimoto, Akihiro Matsui | 2019-08-13 |
| 10224832 | Power conversion device | Yuichi Goto | 2019-03-05 |
| 10097006 | Control device for power converter, control program and power conversion device | Koji Maki, Shingo Yanagimoto | 2018-10-09 |
| 10003331 | Semiconductor device including normally-off type transistors and normally-on type transistor connected series | Kentaro Ikeda, Atsuhiko Kuzumaki | 2018-06-19 |
| 9893509 | Semiconductor switch and power conversion apparatus | Atsuhiko Kuzumaki, Junichi Tsuda, Yushi Koyama | 2018-02-13 |
| 9680406 | Variable-flux motor drive system | Kazuaki Yuuki, Kazuto Sakai | 2017-06-13 |
| 9571002 | Voltage adjusting apparatus | Takuro Arai, Yuji Watanabe | 2017-02-14 |
| 9379548 | Multilevel reactive power compensator | Yushi Koyama, Yosuke Nakazawa, Atsuhiko Kuzumaki, Takeru Murao | 2016-06-28 |
| 9257248 | Semiconductor switch and power conversion apparatus | Atsuhiko Kuzumaki, Junichi Tsuda, Yushi Koyama | 2016-02-09 |
| 9236373 | Semiconductor device | Kentaro Ikeda, Atsuhiko Kuzumaki | 2016-01-12 |
| 8896365 | Semiconductor switch having reverse voltage application circuit and power supply device including the same | Kazuyasu Takimoto, Yosuke Nakazawa, Hiromichi Tai, Atsuhiko Kuzumaki | 2014-11-25 |
| 8884576 | Variable-flux motor drive system | Kazuaki Yuuki, Kazuto Sakai | 2014-11-11 |
| 8860356 | Variable magnetic flux motor drive system | Kazuaki Yuuki, Kazuto Sakai | 2014-10-14 |
| 8791744 | Semiconductor switching system | Kazuyasu Takimoto, Hiromichi Tai, Akihisa Matsushita | 2014-07-29 |
| 8649198 | Power conversion device | Atsuhiko Kuzumaki, Takeru Murao, Masahiro Takasaki, Tadao Ishikawa, Toshiaki Kikuma | 2014-02-11 |
| 8582335 | Inverter apparatus | Ryuta Hasegawa, Masami Hirata, Yukihiko Hatano | 2013-11-12 |
| 8552678 | Variable-flux motor drive system | Kazuaki Yuuki, Kazuto Sakai | 2013-10-08 |
| 8514596 | System interconnection inverter with bypass path | Yushi Koyama, Junichi Tsuda | 2013-08-20 |
| 8472215 | Grid-tie inverter for interconnecting AC voltage to electric power grid | Yushi Koyama, Junichi Tsuda | 2013-06-25 |
| 8179068 | Variable-flux motor drive system | Kazuaki Yuuki, Kazuto Sakai | 2012-05-15 |
| 8089780 | Semiconductor switch and power conversion system provided with semiconductor switch | Tateo Koyama, Atsuhiko Kuzumaki, Junichi Tsuda | 2012-01-03 |
| 7872888 | Electric power conversion system | Atsuhiko Kuzumaki, Tateo Koyama | 2011-01-18 |