Tadashi Okawa

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Hitachi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Twelve-step current source inverter
- Patent number 4,276,589
- Issue date Jun 30, 1981
- Hitachi, Ltd.
- Tadashi Okawa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Protective device of a current source inverter
- Patent number 4,188,663
- Issue date Feb 12, 1980
- Hitachi, Ltd.
- Tadashi Okawa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Variable speed control apparatus for induction motor
- Patent number 4,099,108
- Issue date Jul 4, 1978
- Hitachi, Ltd.
- Tadashi Okawa
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER