Patents by Inventor Seiich Yamada

Seiich Yamada 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).

  • Voltage non-linear resistor and fabricating method thereof
    Patent number: 5610570
    Abstract: A non-linear resistor having a high impulse withstanding ability is obtained by directly applying a crystallized glass to the side surface of a sintered body of a ZnO element, and then bake-attaching the crystallized glass to the side surface of the ZnO element by heat treatment. Since the impulse withstanding ability is improved by applying the crystallized glass as the side surface high-resistivity layer of the voltage non-linear resistor, the performance and reliability of an arrester including the resistor is improved.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: March 11, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Seiich Yamada, Shigeru Tanaka, Moritaka Syouji, Shigehisa Motowaki, Ken Takahashi, Shingo Shirakawa, Kunihiro Maeda