Patents by Inventor Rikizo Ishikawa

Rikizo Ishikawa 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).

  • Disc ceramic capacitor
    Patent number: 4306274
    Abstract: A ceramic capacitor comprises a column-like ceramic element having end faces provided with electrodes, respectively. A disk-like reinforcing element is secured to at least one of the electrodes in close contact therewith. The thickness T and diameter D of the ceramic element are selected so that T/D.ltoreq.0.5 and D.sub.t /D.gtoreq.0.6 where D.sub.t represents the thickness of the reinforcing metal member. The dielectric breakdown field strength appearing upon application of a chopped-wave impulse voltage can be increased at least to the dielectric breakdown field strength appearing upon application of a full-wave impulse voltage.
    Type: Grant
    Filed: September 25, 1980
    Date of Patent: December 15, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Tokio Yamagiwa, Yuzuru Kamata, Yasuro Hori, Rikizo Ishikawa, Jun Ozawa