Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870339 | Variable-speed power generating system | Yosio Furukawa, Yasuhiro Yasaka, Osamu Nagura, Eiji Haraguchi, Hiroto Nakagawa | 1989-09-26 |
| 4816696 | Variable-speed pumped-storage power generating system | Akihiro Sakayori, Takao Kuwabara, Akira Brando, Shigeaki Hayashi, Isao Yokoyama +1 more | 1989-03-28 |
| 4812729 | Protecting apparatus for secondary excitation type variable speed AC generator/motor | Akio Ito, Hidenori Sawa, Hiroshi Sugisaka, Shigeaki Hayashi, Hiroto Nakagawa +1 more | 1989-03-14 |
| 4812730 | Variable-speed generator/motor system | Hiroto Nakagawa, Tadaatsu Kato, Osamu Nagura, Sadahiko Niwa, Yosio Furukawa +1 more | 1989-03-14 |