Patents by Inventor Takeshi Okamato

Takeshi Okamato 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).

  • Rayleigh surface-acoustic-wave device using ZnO(0001)/SiO.sub.2 /Si(111) [11]
    Patent number: 4562371
    Abstract: A surface acoustic wave device comprises a silicon substrate, a conductive layer provided on the silicon substrate, a silicon dioxide layer provided on the conductive layer, input and output electrodes provided on the silicon dioxide layer for input and output of a surface acoustic wave, and a zinc oxide layer provided on the electrodes. The silicon substrate is cut by a crystalline surface substantially equivalent to the (111)-surface, and the zinc oxide layer is such that its crystalline surface substantially equivalent to the (0001)-surface is parallel to the cut-surface of the silicon substrate, so that the surface acoustic wave entered by the input electrode travels to the output electrode in a direction substantially equivalent to the [112]-axis of the silicon substrate.
    Type: Grant
    Filed: December 4, 1984
    Date of Patent: December 31, 1985
    Assignee: Clarion Co., Ltd.
    Inventors: Ryuichi Asai, Takeshi Okamato, Shoichi Minagawa