Seiki Shimizu

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Hitachi, JP

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Patents Grantslast 30 patents

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Vacuum circuit breaker
- Patent number 4,892,986
- Issue date Jan 9, 1990
- Hitachi, Ltd.
- Ruyji Watanabe
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Information recording medium
- Patent number 4,651,172
- Issue date Mar 17, 1987
- Hitachi, Ltd.
- Ryuji Watanabe
- G11 - INFORMATION STORAGE
Information Patent Grant
Vacuum switch and method of manufacturing the same
- Patent number 4,546,222
- Issue date Oct 8, 1985
- Hitachi, Ltd.
- Ryuji Watanabe
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Ceramic substrate with metal plate
- Patent number 4,497,875
- Issue date Feb 5, 1985
- Hitachi, Ltd.
- Hideo Arakawa
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Stacked structure having matrix-fibered composite layers and a meta...
- Patent number 4,482,912
- Issue date Nov 13, 1984
- Hitachi, Ltd.
- Akio Chiba
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...