Tokio Yamagiwa

Person

Hitachi-shi, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Gas insulation switch
- Patent number 6,538,877
- Issue date Mar 25, 2003
- Hitachi, Ltd.
- Tokio Yamagiwa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Power transforming system and method
- Patent number 6,525,917
- Issue date Feb 25, 2003
- Hitachi, Ltd.
- Hiroshi Arita
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Insulated device diagnosing system that prepares detection data fro...
- Patent number 6,424,162
- Issue date Jul 23, 2002
- Hitachi, Ltd.
- Toshiaki Rokunohe
- G01 - MEASURING TESTING
Information Patent Grant
Gas insulation switch
- Patent number 6,373,687
- Issue date Apr 16, 2002
- Hitachi, Ltd.
- Tokio Yamagiwa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Gas insulation switch
- Patent number 6,292,356
- Issue date Sep 18, 2001
- Hitachi, Ltd.
- Tokio Yamagiwa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Gas-insulated electrical apparatus
- Patent number 6,252,763
- Issue date Jun 26, 2001
- Hitachi, Ltd.
- Yoshikatsu Enokida
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Bushing
- Patent number 6,218,627
- Issue date Apr 17, 2001
- Hitachi, Ltd.
- Katsuji Shindo
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas insulated electric apparatus
- Patent number 6,063,997
- Issue date May 16, 2000
- Hitachi, Ltd.
- Fumihiro Endo
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Gas insulated switchgear
- Patent number 6,002,085
- Issue date Dec 14, 1999
- Hitachi, Ltd.
- Tomoaki Utsumi
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Insulated device diagnosing system for diagnosing device based upon...
- Patent number 5,982,181
- Issue date Nov 9, 1999
- Hitachi, Ltd.
- Toshiaki Rokunohe
- G01 - MEASURING TESTING
Information Patent Grant
Optical pressure detection method and apparatus
- Patent number 5,929,989
- Issue date Jul 27, 1999
- Hitachi, Ltd.
- Sadao Mori
- G01 - MEASURING TESTING
Information Patent Grant
Enclosed electric conductor arrangement
- Patent number 5,798,484
- Issue date Aug 25, 1998
- Hitachi, Ltd.
- Tokio Yamagiwa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Ground fault current limiter and method of limiting ground fault cu...
- Patent number 5,699,219
- Issue date Dec 16, 1997
- Hitachi, Ltd.
- Hiroshi Arita
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Gas insulated device, gas insulated switchgear, gas insulated bus l...
- Patent number 5,689,088
- Issue date Nov 18, 1997
- Hitachi, Ltd.
- Toshiaki Rokunohe
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Method of configuring a neural network and a diagnosis/control syst...
- Patent number 5,627,941
- Issue date May 6, 1997
- Hitachi, Ltd.
- Isao Takahashi
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Long-sized tubular grounding container unit for gas-insulated elect...
- Patent number 5,601,735
- Issue date Feb 11, 1997
- Hitachi, Ltd.
- Hideo Kawamoto
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Method of configuring a neural network and a diagnosis/recognition...
- Patent number 5,598,509
- Issue date Jan 28, 1997
- Hitachi, Ltd.
- Isao Takahashi
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Electrical power supply system
- Patent number 5,473,494
- Issue date Dec 5, 1995
- Hitachi, Ltd.
- Yukio Kurosawa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Three-phase collected type optical current transformer
- Patent number 5,410,243
- Issue date Apr 25, 1995
- Hitachi, Ltd.
- Yosinori Tagawa
- G01 - MEASURING TESTING
Information Patent Grant
Method of and device for protecting electrical power system
- Patent number 5,305,174
- Issue date Apr 19, 1994
- Hitachi, Ltd.
- Masao Morita
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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
Power apparatus and method of location of a fault in a power appara...
- Patent number 5,256,976
- Issue date Oct 26, 1993
- Hitachi, Ltd.
- Toshio Ishikawa
- G01 - MEASURING TESTING
Information Patent Grant
Apparatus and method for diagnosis of power appliances
- Patent number 5,253,180
- Issue date Oct 12, 1993
- Hitachi, Ltd.
- Tokio Yamagiwa
- G01 - MEASURING TESTING
Information Patent Grant
Puffer type gas-insulated circuit breaker
- Patent number 5,231,256
- Issue date Jul 27, 1993
- Hitachi, Ltd.
- Tokio Yamagiwa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Abnormality diagnosing system and method for a high voltage power a...
- Patent number 5,214,595
- Issue date May 25, 1993
- Hitachi, Ltd.
- Jun Ozawa
- G01 - MEASURING TESTING
Information Patent Grant
Power apparatus, power transmission/distribution unit, and tripping...
- Patent number 5,124,687
- Issue date Jun 23, 1992
- Hitachi, Ltd.
- Kiyoshi Okumura
- G01 - MEASURING TESTING
Information Patent Grant
Abnormality diagnosing system and method for a high voltage power a...
- Patent number 5,107,447
- Issue date Apr 21, 1992
- Hitachi, Ltd.
- Jun Ozawa
- G01 - MEASURING TESTING
Information Patent Grant
Contact abnormality detecting system
- Patent number 4,975,800
- Issue date Dec 4, 1990
- Hitachi, Ltd.
- Youichi Oshita
- G01 - MEASURING TESTING
Information Patent Grant
Insulation testing device for gas insulated apparatus
- Patent number 4,829,256
- Issue date May 9, 1989
- Hitachi, Ltd.
- Tokio Yamagiwa
- G01 - MEASURING TESTING
Information Patent Grant
Insulating spacers for use in gas-insulated electric apparatus
- Patent number 4,818,825
- Issue date Apr 4, 1989
- Hitachi, Ltd.
- Toshio Ishikawa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

Patents Applicationslast 30 patents

Information Patent Application
Insulated device diagnosing system and partial discharge detecting...
- Publication number 20020163344
- Publication date Nov 7, 2002
- Hitachi, Ltd.
- Toshiaki Rokunohe
- G01 - MEASURING TESTING
Information Patent Application
Gas insulation switch
- Publication number 20020071242
- Publication date Jun 13, 2002
- Hitachi, Ltd.
- Tokio Yamagiwa
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Application
Gas insulation switch
- Publication number 20020008958
- Publication date Jan 24, 2002
- Hitachi, Ltd.
- Tokio Yamagiwa
- H01 - BASIC ELECTRIC ELEMENTS

Tokio Yamagiwa

Person

Patents Grantslast 30 patents

Gas insulation switch

Power transforming system and method

Insulated device diagnosing system that prepares detection data fro...

Gas insulation switch

Gas insulation switch

Gas-insulated electrical apparatus

Bushing

Gas insulated electric apparatus

Gas insulated switchgear

Insulated device diagnosing system for diagnosing device based upon...

Optical pressure detection method and apparatus

Enclosed electric conductor arrangement

Ground fault current limiter and method of limiting ground fault cu...

Gas insulated device, gas insulated switchgear, gas insulated bus l...

Method of configuring a neural network and a diagnosis/control syst...

Long-sized tubular grounding container unit for gas-insulated elect...

Method of configuring a neural network and a diagnosis/recognition...

Electrical power supply system

Three-phase collected type optical current transformer

Method of and device for protecting electrical power system

Gas blast, puffer type circuit breaker with improved nozzle

Power apparatus and method of location of a fault in a power appara...

Apparatus and method for diagnosis of power appliances

Puffer type gas-insulated circuit breaker

Abnormality diagnosing system and method for a high voltage power a...

Power apparatus, power transmission/distribution unit, and tripping...

Abnormality diagnosing system and method for a high voltage power a...

Contact abnormality detecting system

Insulation testing device for gas insulated apparatus

Insulating spacers for use in gas-insulated electric apparatus

Patents Applicationslast 30 patents

Insulated device diagnosing system and partial discharge detecting...

Gas insulation switch

Gas insulation switch