Patents by Inventor Toyokazu Kouan

Toyokazu Kouan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus for detecting direct current magnetic flux deflections of an electrical transformer
    Patent number: 4916402
    Abstract: An apparatus for detecting direct current magnetic flux deflection of an electrical transformer comprising a magnetic detector for generating an output voltage waveform, an integrator connected to the magnetic detector for integrating the output voltage waveform from the magnetic detector. Positive and negative peak value detectors are connected to the integrator for detecting positive and negative peak values of the output voltage waveform integrated by the integrator. A comparator connected to the positive and the negative peak value detectors compares the positive and the negative peak values to provide a peak difference.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: April 10, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toyokazu Kouan, Katsumi Shiono
  • Apparatus and process for detecting direct current magnetic flux deflections in an electrical transformer employing Fourier analysis
    Patent number: 4904945
    Abstract: An apparatus for detecting direct current magnetic flux deflection of an electrical transformer comprising a magnetic detector for generating an output voltage waveform and Fourier series developer connected to the magnetic detector for developing the output voltage waveform from the magnetic detector into a Fourier series. An even number harmonic detector is connected to the Fourier series developer for detecting an even number harmonic in the Fourier series, thereby determining the presence of a direct current magnetic flux deflection. A process for detecting direct current magnetic flux deflection is also disclosed.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: February 27, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toyokazu Kouan, Katsumi Shiono