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Koujirou Yamashita
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Hitachi, JP
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last 30 patents
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Patent Grant
Method and apparatus for operating vacuum cleaner
Patent number
5,294,872
Issue date
Mar 15, 1994
Hitachi, Ltd.
Haruo Koharagi
A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
Information
Patent Grant
Motor control apparatus for an electric vacuum cleaner
Patent number
5,166,585
Issue date
Nov 24, 1992
Hitachi, Ltd.
Haruo Koharagi
A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
Information
Patent Grant
Method and apparatus for operating vacuum cleaner
Patent number
5,075,607
Issue date
Dec 24, 1991
Hitachi, Ltd.
Haruo Koharagi
A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
Information
Patent Grant
Power source apparatus
Patent number
5,050,057
Issue date
Sep 17, 1991
Hitachi, Ltd.
Yasuo Notohara
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Low speed high torque motor with production method
Patent number
4,998,034
Issue date
Mar 5, 1991
Hitachi, Ltd.
Ichiro Hashimoto
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Method and apparatus for operating vacuum cleaner
Patent number
4,983,895
Issue date
Jan 8, 1991
Hitachi, Ltd.
Haruo Koharagi
A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
Information
Patent Grant
Method and apparatus for operating vacuum cleaner
Patent number
4,880,474
Issue date
Nov 14, 1989
Hitachi, Ltd.
Haruo Koharagi
A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
Information
Patent Grant
Speed control apparatus for a brushless direct current motor
Patent number
4,855,652
Issue date
Aug 8, 1989
Hitachi, Ltd.
Koujirou Yamashita
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER