Patents by Inventor Kazuo Kiuchi

Kazuo Kiuchi 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).

  • Perovskite ceramic and fabrication method thereof
    Patent number: 4885267
    Abstract: A perovskite ceramic is prepared by separately preliminarily calcining raw material powders of two kinds of perovskite ceramic materials having mutually different compositions to form two kinds of perovskite ceramic materials having respective high dielectric constants and mutually different Curie temperatures, crushing and mixing the calcined materials at an adequate ratio, and sintering the mixed materials without forming a and change complete solid solution thereof. The two kinds of perovskite ceramic materials have the formula Pb(Fe.sub.2/3 W.sub.1/3).sub.x.sbsb.i (Fe.sub.1/2 Nb.sub.1/2).sub.1-x.sbsb.i O.sub.3, wherein in a first kind of perovskite ceramic material i=1 and 0.1.ltoreq.x.sub.1 .ltoreq.0.2, and in a second kind of ceramic perovskite material i=2 and 0.5.ltoreq.x.sub.2 .ltoreq.0.9, the two kinds of perovskite ceramic material coexisting in the mixing ratio 0.5.ltoreq.x.sub.2 /(x.sub.1 +x.sub.2).ltoreq.0.8.
    Type: Grant
    Filed: December 17, 1987
    Date of Patent: December 5, 1989
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Hideyuki Takahara, Kazuo Kiuchi