Patents by Inventor Sigeru Jyomura

Sigeru Jyomura 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).

  • Piezoelectric single crystal and surface acoustic wave element employing the same
    Patent number: 4333842
    Abstract: A piezoelectric single crystal which has a composition represented by a general formula (Ba.sub.2-x Sr.sub.x)TiSi.sub.2 O.sub.8, the value x lying within a range of 0.25.ltoreq.x.ltoreq.1.2; and a surface acoustic wave element which is so constructed as to employ surface waves that propagate on a cut plane perpendicular to the Z-axis of the single crystal, or surface waves that propagate in a specified direction on a cut plane containing the X-axis of the single crystal. The piezoelectric single crystal and the surface acoustic wave element employing it have the merits that the electromechanical coupling factor of the surface acoustic waves is great and that the temperature coefficient of delay time of the surface acoustic waves is small.
    Type: Grant
    Filed: August 15, 1980
    Date of Patent: June 8, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Yukio Ito, Kazuyuki Nagatsuma, Sigeru Jyomura, Sakichi Ashida, Hiroshi Takeuchi