Patents by Inventor Junichi Katurayama

Junichi Katurayama 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 and foam resin sheet speaker
    Patent number: 4807294
    Abstract: A sheet speaker comprised of a planar piezoelectric ceramic sheet encapsulated in a planar sheet of hard resin foam, comprised of a polystyrene, urethane, urea or phenolic. The planar piezoelectric ceramic sheet is centered in the planar hard resin from sheet which provides a surface area of 10-50 times the surface area of the planar piezoelectric sheet. The surface of the planar hard resin foam may be lined with cloth, paper, or plastic film.
    Type: Grant
    Filed: June 17, 1987
    Date of Patent: February 21, 1989
    Assignee: Mitubishi Petrochemical Co., Ltd.
    Inventors: Yoichi Iwata, Nubuo Tanaka, Junichi Katurayama