Issued Patents All Time
Showing 51–69 of 69 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5090872 | Method of controlling the operation of a pump in a pumping installation by detecting counterflow | Ezo Kita, Isao Yokoyama, Hiroto Nakagawa, Yasuteru Oono | 1992-02-25 |
| 5026256 | Variable speed pumping-up system | Hisao Inoue, Hiroto Nakagawa, Eizo Kita | 1991-06-25 |
| 4920277 | Control system for a variable speed hydro-power plant apparatus | Hiroto Nakagawa, Eizo Kita | 1990-04-24 |
| 4874999 | Automatic control system | Kazuo Takahashi | 1989-10-17 |
| 4823018 | Control system for variable speed water-wheel generator apparatus | Akira Bando, Eiji Haraguchi, Hiroto Nakagawa | 1989-04-18 |
| 4816696 | Variable-speed pumped-storage power generating system | Akihiro Sakayori, Akira Brando, Yasuteru Oono, Shigeaki Hayashi, Isao Yokoyama +1 more | 1989-03-28 |
| 4754156 | Control apparatus for variable-speed hydraulic power generating system | Junichi Shiozaki, Akira Bando, Eiji Haraguchi, Hiroto Nakagawa | 1988-06-28 |
| 4743827 | Variable speed pumping-up electrical power system | Junichi Shiozaki, Akira Bando, Kenichi Ono, Akihiro Sakayori, Ichiro Hitomi +2 more | 1988-05-10 |
| 4629393 | Method of operating multistage hydraulic machinery | Akihiro Sakayori | 1986-12-16 |
| 4625125 | Method and apparatus for controlling variable-speed hydraulic power generating system | — | 1986-11-25 |
| 4624622 | Fail-safe system for a reversible pump-turbine apparatus | Keitaro Takiguchi | 1986-11-25 |
| 4475334 | Method of and system for controlling hydraulic turbine | — | 1984-10-09 |
| 4472104 | Operation control method for multistage regulated hydraulic machine | — | 1984-09-18 |
| 4472105 | Rotary type pumping machine | Keitaro Takiguchi | 1984-09-18 |
| 4382745 | Method of controlling wicket gates of a pump-turbine | Hiroshi Okumura | 1983-05-10 |
| 4354800 | Method of controlling pump turbine | — | 1982-10-19 |
| 4303370 | Control apparatus and method of operating the same | Hisaya Uchiyama, Hiroshi Okumura | 1981-12-01 |
| 4253794 | Method of controlling wicket gates of a pump-turbine | — | 1981-03-03 |
| 4201925 | Method for starting hydraulic turbine generator | Hiroshi Okumura, Toshiaki Yokoyama | 1980-05-06 |