Hirohiko Yatsuzuka

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Hitachi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method and device for detecting a partial discharge in an electrica...
- Patent number 6,661,235
- Issue date Dec 9, 2003
- Hitachi, Ltd.
- Toshiaki Rokunohe
- G01 - MEASURING TESTING
Information Patent Grant
Gas-insulated electrical apparatus
- Patent number 6,252,763
- Issue date Jun 26, 2001
- Hitachi, Ltd.
- Yoshikatsu Enokida
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas insulated switchgear apparatus
- Patent number 5,757,614
- Issue date May 26, 1998
- Hitachi, Ltd.
- Masaki Hachida
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Gas insulated switchgear
- Patent number 5,581,439
- Issue date Dec 3, 1996
- Hitachi, Ltd.
- Masaki Hachida
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Gas circuit breaker
- Patent number 5,298,703
- Issue date Mar 29, 1994
- Hitachi, Ltd.
- Hirohiko Yatsuzuka
- H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents

Information Patent Application
Gas-insulated switch
- Publication number 20020149904
- Publication date Oct 17, 2002
- Masaki Hachida
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Application
Method and device for detecting a partial discharge in an electrica...
- Publication number 20020024341
- Publication date Feb 28, 2002
- Toshiaki Rokunohe
- G01 - MEASURING TESTING