Ryutaro Yamamoto

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Komae, JP

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Patents Grantslast 30 patents

Information Patent Grant
Insulated type switchgear device
- Patent number 6,005,213
- Issue date Dec 21, 1999
- Hitachi, Ltd.
- Ayumu Morita
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Vacuum type switch gear device having L shaped stationary and movab...
- Patent number 5,952,636
- Issue date Sep 14, 1999
- Hitachi, Ltd.
- Ayumu Morita
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Protection system for power receiving station
- Patent number 5,892,645
- Issue date Apr 6, 1999
- Hitachi, Ltd.
- Yoshiyasu Watanabe
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER