Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5561358 | Variable speed pumping-up generator | Takao Kuwabara, Masataka Harada, Hiroto Nakagawa | 1996-10-01 |
| 5456115 | Method of counterflow through a pump and method of controlling the operation of a pump in a pumping installation | Takao Kuwabara, Ezo Kita, Isao Yokoyama, Hiroto Nakagawa | 1995-10-10 |
| 5265002 | Fault protection for a multiphase bridge power converter | Akira Bando, Chikara Tanaka, Keiji Saito, Tadao Kawai, Eizo Kita +2 more | 1993-11-23 |
| 5090872 | Method of controlling the operation of a pump in a pumping installation by detecting counterflow | Takao Kuwabara, Ezo Kita, Isao Yokoyama, Hiroto Nakagawa | 1992-02-25 |
| 4980629 | AC-excited generator/motor apparatus | Akira Bando, Osamu Nagura, Shigehiro Kayukawa, Junichi Shiozaki, Akira Momiyama +1 more | 1990-12-25 |
| 4952852 | Power system and synchronizing breakers for a variable speed generator motor system | Akira Bando, Osamu Nagura, Keiji Saito, Ikuro Miyashita, Hashime Nagai +1 more | 1990-08-28 |
| 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 |