Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12244149 | Energy supply system | Keiji Sakagawa, Kazuhide Hakamada, Akira HANAMITSU, Kazuhiko Tanimura | 2025-03-04 |
| 10370008 | Vehicle air-conditioning system and railroad vehicle equipped with same | Keiji Sakagawa, Ryosuke Mitani, Kazuto Nakai | 2019-08-06 |