Kunio Hirasawa

Person

Hitachi, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Gas insulated high voltage circuit breaker including tulip contact...
- Patent number 5,734,140
- Issue date Mar 31, 1998
- Hitachi, Ltd.
- Hiromichi Hokuto
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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
Apparatus for controlling opening and closing timings of a switchin...
- Patent number 5,563,459
- Issue date Oct 8, 1996
- Hitachi, Ltd.
- Yukio Kurosawa
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Switch mechanism
- Patent number 5,502,290
- Issue date Mar 26, 1996
- Hitachi, Ltd.
- Osamu Koyanagi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Voltage or reactive power control method and control device therefor
- Patent number 5,327,355
- Issue date Jul 5, 1994
- Hitachi, Ltd.
- Tomio Chiba
- G05 - CONTROLLING REGULATING
Information Patent Grant
Gas blast, puffer type circuit breaker with improved nozzle
- Patent number 5,274,205
- Issue date Dec 28, 1993
- Hitachi, Ltd.
- Masanori Tsukushi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Synthetic equivalent test circuit of circuit breaker
- Patent number 5,153,518
- Issue date Oct 6, 1992
- Hitachi, Ltd.
- Minori Satoh
- G01 - MEASURING TESTING
Information Patent Grant
Ion source device
- Patent number 4,847,476
- Issue date Jul 11, 1989
- Hitachi, Ltd.
- Tadashi Sato
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Ion source
- Patent number 4,739,169
- Issue date Apr 19, 1988
- Hitachi, Ltd.
- Yukio Kurosawa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
High-voltage DC circuit breaker apparatus
- Patent number 4,578,730
- Issue date Mar 25, 1986
- Hitachi, Ltd.
- Shunji Tokuyama
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
SF.sub.6 Gas arc extinguishing electric apparatus and process for p...
- Patent number 4,562,322
- Issue date Dec 31, 1985
- Hitachi, Ltd.
- Motoo Yamaguchi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Puffer type current interrupter
- Patent number 4,442,330
- Issue date Apr 10, 1984
- Hitachi, Ltd.
- Youichi Oshita
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas circuit breaker of resistance breaking type
- Patent number 4,423,298
- Issue date Dec 27, 1983
- Hitachi, Ltd.
- Masanori Tsukushi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Grounded support tank type gas circuit breaker
- Patent number 4,239,948
- Issue date Dec 16, 1980
- Hitachi, Ltd.
- Masanori Tsukushi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Electromagnetic puffer type gas circuit breaker
- Patent number 4,211,903
- Issue date Jul 8, 1980
- Hitachi, Ltd.
- Masanori Tsukushi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Puffer-type gas-blast circuit breaker
- Patent number 4,160,888
- Issue date Jul 10, 1979
- Hitachi, Ltd.
- Ken-ichi Natsui
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Magnetic puffer type gas circuit breaker
- Patent number 4,105,879
- Issue date Aug 8, 1978
- Hitachi, Ltd.
- Masanori Tsukushi
- H01 - BASIC ELECTRIC ELEMENTS

Kunio Hirasawa

Person

Patents Grantslast 30 patents

Gas insulated high voltage circuit breaker including tulip contact...

Gas insulated circuit breaker

Apparatus for controlling opening and closing timings of a switchin...

Switch mechanism

Voltage or reactive power control method and control device therefor

Gas blast, puffer type circuit breaker with improved nozzle

Synthetic equivalent test circuit of circuit breaker

Ion source device

Ion source

High-voltage DC circuit breaker apparatus

SF.sub.6 Gas arc extinguishing electric apparatus and process for p...

Puffer type current interrupter

Gas circuit breaker of resistance breaking type

Grounded support tank type gas circuit breaker

Electromagnetic puffer type gas circuit breaker

Puffer-type gas-blast circuit breaker

Magnetic puffer type gas circuit breaker