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Patents Grants
last 30 patents
Information
Patent Grant
Gas circuit breaker
Patent number
5,837,955
Issue date
Nov 17, 1998
Hitachi, Ltd.
Tomoaki Utsumi
H01 - BASIC ELECTRIC ELEMENTS
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
Gas circuit breaker and liquid pressure-driving system to be used t...
Patent number
5,804,787
Issue date
Sep 8, 1998
Hitachi, Ltd.
Goro Daimon
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
Hydraulic drive device for circuit breaker and circuit breaker usin...
Patent number
5,750,950
Issue date
May 12, 1998
Hitachi, Ltd.
Tadahiko Nogami
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Insulation gas filled circuit breaker
Patent number
5,728,989
Issue date
Mar 17, 1998
Hitachi, Ltd.
Tomoaki Utsumi
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Gas insulated circuit breaker
Patent number
5,661,282
Issue date
Aug 26, 1997
Hitachi, Ltd.
Kenji Tsuchiya
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