Patents by Inventor Seiji Sonoyama

Seiji Sonoyama 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).

  • Lighting arrester with leakage current detection
    Patent number: 4507701
    Abstract: A lightning arrester comprises nonlinear resistance discs 2 stacked within a ceramic casing 1, with annular metal cover rings 3, 4 being fixed to the opposite outer ends of the casing. Conductive plates 5, 19 having reduced thickness rupturable central portions are sealed to the inner ends of the casing, with the lower plate 19 being insulated from the lower ring 4 by an insulating ring 20. An ammeter 16 is connected between the conductive plate 19 and ground by a lead wire 21 passing through the ring skirt but insulated therefrom, whereby only leakage current passing through the nonlinear resistance discs is sensed.
    Type: Grant
    Filed: June 24, 1983
    Date of Patent: March 26, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yukio Fujiwara, Seiji Sonoyama, Mitsumasa Imataki