Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4816696 | Variable-speed pumped-storage power generating system | Akihiro Sakayori, Takao Kuwabara, Akira Brando, Yasuteru Oono, 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, Hiroto Nakagawa, Yasuteru Oono +1 more | 1989-03-14 |