Patents by Inventor Shinichi Oowada

Shinichi 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).

  • Method of fabricating non-linear resistor
    Patent number: 5614138
    Abstract: A mixture of calcinated metallic oxides are mixed with ZnO and SiO.sub.2, granulated, compacted and then sintered to form a nonlinear resistor. After sintering, the formed ZnO resistor elements are heat treated, preferably in a two-step heat treating process.
    Type: Grant
    Filed: February 7, 1995
    Date of Patent: March 25, 1997
    Assignee: Hitachi Ltd.
    Inventors: Seiichi Yamada, Shigeru Tanaka, Moritaka Shoji, Shigehisa Motowaki, Ken Takahashi, Shingo Shirakawa, Shinichi Oowada, Takeo Yamazaki