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Masahiko Akamatsu

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  • Amagasaki, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Semiconductor power converter and its applied apparatus
    • Patent number 6,215,682
    • Issue date Apr 10, 2001
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Power semiconductor switching device
    • Patent number 6,078,066
    • Issue date Jun 20, 2000
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Power conversion apparatus
    • Patent number 6,052,297
    • Issue date Apr 18, 2000
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Compensation control device for a power system
    • Patent number 5,942,880
    • Issue date Aug 24, 1999
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Voltage source type power converting apparatus
    • Patent number 5,886,888
    • Issue date Mar 23, 1999
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Power system compensator apparatus and power converter apparatus
    • Patent number 5,646,511
    • Issue date Jul 8, 1997
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Inductively commutated thyristor inverter
    • Patent number 4,506,319
    • Issue date Mar 19, 1985
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Semiconductor switch device
    • Patent number 4,491,742
    • Issue date Jan 1, 1985
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Semiconductor switch device
    • Patent number 4,488,059
    • Issue date Dec 11, 1984
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Power semiconductor switching device
    • Patent number 4,472,642
    • Issue date Sep 18, 1984
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Four terminal GTO thyristor with transistor controlled turn-off
    • Patent number 4,338,617
    • Issue date Jul 6, 1982
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Inductor type synchronous motor driving system for minute control o...
    • Patent number 4,321,518
    • Issue date Mar 23, 1982
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Synchronous machine drive apparatus
    • Patent number 4,319,176
    • Issue date Mar 9, 1982
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Induction motor control system
    • Patent number 4,310,791
    • Issue date Jan 12, 1982
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Driving method of motor fed by electric valve feeding apparatus and...
    • Patent number 4,309,643
    • Issue date Jan 5, 1982
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Transformer device
    • Patent number 4,298,838
    • Issue date Nov 3, 1981
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • G01 - MEASURING TESTING
  • Information Patent Grant

    Semiconductor switch device
    • Patent number 4,287,434
    • Issue date Sep 1, 1981
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Power control system and apparatus thereof
    • Patent number 4,251,757
    • Issue date Feb 17, 1981
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Turn off method for power transistor switch
    • Patent number 4,239,988
    • Issue date Dec 16, 1980
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    AC Feeding apparatus and rotating field apparatus having AC feeding...
    • Patent number 4,218,646
    • Issue date Aug 19, 1980
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Transistor switch device
    • Patent number 4,189,651
    • Issue date Feb 19, 1980
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    AC current control system for AC power supply
    • Patent number 4,172,991
    • Issue date Oct 30, 1979
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Semiconductor switch device
    • Patent number 4,164,667
    • Issue date Aug 14, 1979
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Semiconductor switch
    • Patent number 4,162,413
    • Issue date Jul 24, 1979
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    AC rotary machine apparatus
    • Patent number 4,161,680
    • Issue date Jul 17, 1979
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Motor drive apparatus
    • Patent number 4,160,938
    • Issue date Jul 10, 1979
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Power control or conversion apparatus
    • Patent number 4,146,921
    • Issue date Mar 27, 1979
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Shunt circuit for an insulation type current transformer to adapt t...
    • Patent number 4,140,961
    • Issue date Feb 20, 1979
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H01 - BASIC ELECTRIC ELEMENTS
  • Information Patent Grant

    Homopolar synchronous machine
    • Patent number 4,134,054
    • Issue date Jan 9, 1979
    • Mitsubishi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Inductor type synchronous motor driving system
    • Patent number 4,134,055
    • Issue date Jan 9, 1979
    • Mitsubushi Denki Kabushiki Kaisha
    • Masahiko Akamatsu
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER