Patents by Inventor Siniti Oowada

Siniti Oowada 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).

  • Nonlinear resistor and process for producing the same
    Patent number: 4450426
    Abstract: A nonlinear resistor comprising a sintered body containing zinc oxide as a major component and at least bismuth oxide and boron oxide and electrodes formed thereon, said sintered body having a higher .gamma.-form bismuth oxide phase concentration in upper and/or lower surface layers of the sintered body than in the inner portion of the sintered body, has stabilized properties against long-time voltage application. When the sintered body is further modified by making the .gamma.-form bismuth oxide phase concentration in the periphery portions of the upper and/or lower surface layers lower than that in the inner portions of the upper and/or lower surface layers, the resulting nonlinear resistor shows a higher long-duration current impulse withstand capability.
    Type: Grant
    Filed: April 6, 1981
    Date of Patent: May 22, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Tadahiko Miyoshi, Takeo Yamazaki, Kunihiro Maeda, Ken Takahashi, Siniti Oowada