Inventor
HIRASAWA KUNIO
JP18 patents
Patents
18 patentsUS5563459AOct 8, 1996
Apparatus for controlling opening and closing timings of a switching device in an electric power system
HITACHI LTD112 citations98
US4739169AApr 19, 1988
Ion source
HITACHI LTD36 citations92
US5327355AJul 5, 1994
Voltage or reactive power control method and control device therefor
HITACHI LTD26 citations91
US4562322ADec 31, 1985
SF6 Gas arc extinguishing electric apparatus and process for producing the same
HITACHI LTD30 citations91
US4578730AMar 25, 1986
High-voltage DC circuit breaker apparatus
HITACHI LTD23 citations79
US4105879AAug 8, 1978
Magnetic puffer type gas circuit breaker
HITACHI LTD8 citations73
US4059741ANov 22, 1977
Puffer type gas circuit breaker
HITACHI LTD10 citations73
US5734140AMar 31, 1998
Gas insulated high voltage circuit breaker including tulip contact assembly and insertion resistor
HITACHI LTD14 citations71
US5153518AOct 6, 1992
Synthetic equivalent test circuit of circuit breaker
HITACHI LTD8 citations71
US4847476AJul 11, 1989
Ion source device
HITACHI LTD17 citations71
US4160888AJul 10, 1979
Puffer-type gas-blast circuit breaker
HITACHI LTD15 citations71
US5502290AMar 26, 1996
Switch mechanism
HITACHI LTD5 citations63
US4423298ADec 27, 1983
Gas circuit breaker of resistance breaking type
HITACHI LTD5 citations62
US4211903AJul 8, 1980
Electromagnetic puffer type gas circuit breaker
HITACHI LTD3 citations62
US5274205ADec 28, 1993
Gas blast, puffer type circuit breaker with improved nozzle
HITACHI LTD2 citations61
US4239948ADec 16, 1980
Grounded support tank type gas circuit breaker
HITACHI LTD3 citations61
US5661282AAug 26, 1997
Gas insulated circuit breaker
HITACHI LTD5 citations60
US4442330AApr 10, 1984
Puffer type current interrupter
HITACHI LTD5 citations60