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Hiroshi Narita
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Mito, JP
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last 30 patents
Information
Patent Grant
Constant-voltage diode for over-voltage protection
Patent number
5,430,311
Issue date
Jul 4, 1995
Hitachi, Ltd.
Susumu Murakami
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Gate drive power source for electric power converter
Patent number
5,424,937
Issue date
Jun 13, 1995
Hitachi, Ltd.
Ryuji Iyotani
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Control system for maintaining traction of rolling stock
Patent number
4,701,682
Issue date
Oct 20, 1987
Hitachi, Ltd.
Tetsuji Hirotsu
B60 - VEHICLES IN GENERAL
Information
Patent Grant
Control system for power converter
Patent number
4,675,799
Issue date
Jun 23, 1987
Hitachi, Ltd.
Masato Suzuki
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Control of induction motor using PWM inverter
Patent number
4,490,666
Issue date
Dec 25, 1984
Hitachi, Ltd.
Tokunosuke Tanamachi
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Induction motor control system and method
Patent number
4,338,558
Issue date
Jul 6, 1982
Hitachi, Ltd.
Shigetoshi Okamatsu
B60 - VEHICLES IN GENERAL
Information
Patent Grant
Control system for electric motor vehicle
Patent number
4,335,337
Issue date
Jun 15, 1982
Hitachi, Ltd.
Shigetoshi Okamatsu
B60 - VEHICLES IN GENERAL
Information
Patent Grant
Control apparatus for electric car
Patent number
4,327,313
Issue date
Apr 27, 1982
Hitachi, Ltd.
Takashi Tsuboi
B60 - VEHICLES IN GENERAL
Information
Patent Grant
Control system for induction motor-driven car
Patent number
4,315,203
Issue date
Feb 9, 1982
Hitachi, Ltd.
Masahiko Ibamoto
B60 - VEHICLES IN GENERAL
Information
Patent Grant
Motor control apparatus with an improved thyristor chopper circuit
Patent number
4,284,934
Issue date
Aug 18, 1981
Hitachi, Ltd.
Hiroshi Narita
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Braking control system selectively operable in dynamic and regenera...
Patent number
4,216,420
Issue date
Aug 5, 1980
Hitachi, Ltd.
Yoshiji Jinbo
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Motor control apparatus with an improved thyristor chopper circuit
Patent number
4,209,733
Issue date
Jun 24, 1980
Hitachi, Ltd.
Hiroshi Narita
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Control apparatus for an electric car
Patent number
4,171,506
Issue date
Oct 16, 1979
Hitachi, Ltd.
Michimasa Horiuchi
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Magnetic phase shifter control system
Patent number
4,163,191
Issue date
Jul 31, 1979
Hitachi, Ltd.
Hisakatsu Kiwaki
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER