Seiichi Maruyama

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Hitachi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Transmission line protection system
- Patent number 4,675,773
- Issue date Jun 23, 1987
- Hitachi, Ltd.
- Shingo Shirakawa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Zinc oxide lightning protector
- Patent number 4,587,592
- Issue date May 6, 1986
- Hitachi, Ltd.
- Kouichi Nakano
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Enclosed-type zinc-oxide surge arrester
- Patent number 4,321,651
- Issue date Mar 23, 1982
- Hitachi, Ltd.
- Jun Ozawa
- H01 - BASIC ELECTRIC ELEMENTS