Kogi Ishikawa

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Mito, JP

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Patents Grantslast 30 patents

Information Patent Grant
Puffer type gas circuit breaker
- Patent number 5,814,781
- Issue date Sep 29, 1998
- Hitachi, Ltd.
- Osamu Koyanagi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Puffer type gas breaker
- Patent number 5,793,597
- Issue date Aug 11, 1998
- Hitachi, Ltd.
- Eisaku Mizufune
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Compression gas puffer type circuit breaker
- Patent number 5,610,381
- Issue date Mar 11, 1997
- Hitachi, Ltd.
- Eisaku Mizufune
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Puffer type gas circuit interrupter
- Patent number 5,155,312
- Issue date Oct 13, 1992
- Hitachi, Ltd.
- Akira Hashimoto
- H01 - BASIC ELECTRIC ELEMENTS