Tadao Kawai

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Hitachi, JP

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Patents Grantslast 30 patents

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Digital control and protection equipment for power system
- Patent number 5,428,553
- Issue date Jun 27, 1995
- Hitachi, Ltd.
- Tomio Chiba
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Fault protection for a multiphase bridge power converter
- Patent number 5,265,002
- Issue date Nov 23, 1993
- Hitachi, Ltd.
- Akira Bando
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Digital signal processing method and system, electric power system...
- Patent number 5,255,202
- Issue date Oct 19, 1993
- Hitachi, Ltd.
- Mitsuyasu Kido
- G01 - MEASURING TESTING
Information Patent Grant
Semiconductor electric power conversion system enabling fault and/o...
- Patent number 5,099,409
- Issue date Mar 24, 1992
- Hitachi, Ltd.
- Akira Bando
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Converter control apparatus for parallel connected multi-terminal d...
- Patent number 4,441,032
- Issue date Apr 3, 1984
- Hitachi, Ltd.
- Takeichi Sakurai
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Ground fault detecting device for use with a DC circuit
- Patent number 4,430,683
- Issue date Feb 7, 1984
- Hitachi, Ltd.
- Tadao Kawai
- G01 - MEASURING TESTING