Hiroshi Okumura

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Hitachi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method of controlling wicket gates of a pump-turbine
- Patent number 4,382,745
- Issue date May 10, 1983
- Hitachi, Ltd.
- Takao Kuwabara
- F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
Information Patent Grant
Control apparatus and method of operating the same
- Patent number 4,303,370
- Issue date Dec 1, 1981
- Hitachi, Ltd.
- Takao Kuwabara
- F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
Information Patent Grant
Method for starting hydraulic turbine generator
- Patent number 4,201,925
- Issue date May 6, 1980
- Hitachi, Ltd.
- Takao Kuwabara
- F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
Information Patent Grant
Operation-control method for hydraulic machine
- Patent number 4,137,004
- Issue date Jan 30, 1979
- Hitachi, Ltd.
- Takao Kuwabara
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES