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last 30 patents
Information
Patent Grant
Position correcting control system for servomechanism device
Patent number
4,788,482
Issue date
Nov 29, 1988
Hitachi, Ltd.
Kyozo Tachibana
B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
Information
Patent Grant
Power factor improving apparatus for power converter
Patent number
4,306,283
Issue date
Dec 15, 1981
Hitachi, Ltd.
Hisakatsu Kiwaki
B60 - VEHICLES IN GENERAL
Information
Patent Grant
Electric power converter apparatus for an a.c. electric rolling stock
Patent number
4,245,291
Issue date
Jan 13, 1981
Hitachi, Ltd.
Yoshio Tsutsui
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Power converter control system
Patent number
4,144,559
Issue date
Mar 13, 1979
Hitachi, Ltd.
Yoshio Okumura
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information
Patent Grant
Power converter control apparatus
Patent number
4,136,305
Issue date
Jan 23, 1979
Hitachi, Ltd.
Yoshio Okumura
B60 - VEHICLES IN GENERAL
Information
Patent Grant
High harmonic current reducing apparatus in power converter
Patent number
4,122,515
Issue date
Oct 24, 1978
Hitachi, Ltd.
Kyozo Tachibana
H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER