Masafumi Sugi

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Patents Grantslast 30 patents

Information Patent Grant
Explosion-proof porcelain housings for gas-filled insulating appara...
- Patent number 5,654,047
- Issue date Aug 5, 1997
- NGK Instulators, Ltd.
- Akihiro Watanabe
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of lining resins on an inner surface of a tapered porcelain...
- Patent number 5,234,713
- Issue date Aug 10, 1993
- NGK Insulators, Ltd.
- Akihiro Watanabe
- B28 - WORKING CEMENT, CLAY, OR STONE