Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11070046 | Short-circuit protection circuit for self-arc-extinguishing type semiconductor element | Yoshitaka Naka, Yasushi Nakayama, Yoshiko Tamada, Hiroyuki Takagi, Kazuhiro Otsu +1 more | 2021-07-20 |
| 9966947 | Gate driving circuit for insulated gate-type power semiconductor element | Kazuhiro Otsu | 2018-05-08 |
| 9419605 | Composite semiconductor switching device | — | 2016-08-16 |
| 8576593 | AC-DC power converting apparatus having sub-converters connected in series between main converter and AC power supply | Osamu Mori, Toshiyuki Fujii, Akihiko Iwata, Masanori Yasue, Yukimori Kishida | 2013-11-05 |
| 7896137 | Elevator power system having plural storage apparatuses | — | 2011-03-01 |
| 6405834 | Elevator maintenance/operation apparatus | Akihiro Chida, Shigeki Yamakawa, Hiroshi Ando, Kunio Katou | 2002-06-18 |
| 6230845 | Moveable control panel for elevators | Shigeki Yamakawa, Hiroyuki Takagi, Seiji Okuda, Tatsushi Takahashi, Tomohiko Yao | 2001-05-15 |