Patents by Inventor Eiya Aikawa

Eiya Aikawa 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).

  • Zero-phase sequence current detector
    Patent number: 5159561
    Abstract: A zero-phase sequence current detector have three circular cores provided around three phases overhead lines of AC power lines, three magnetoptic sensors provided on respective cores for detecting currents flowing on respective power lines, and a processing circuit containing an adding circuit for adding outputs of the magnetoptic sensors and a compensation processing circuit for canceling erroneous components due to the differences of the temperature characteristics among the magnetoptic sensors.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: October 27, 1992
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Chubu Electric Power Company, Incorporated
    Inventors: Masami Watanabe, Noboru Mikami, Eiya Aikawa, Yoshinari Furukawa