Patents by Inventor Shigetaka Tonami

Shigetaka Tonami 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).

  • Surface acoustic wave device and portable telephone using same
    Patent number: 5854527
    Abstract: The surface acoustic wave device of the invention comprises a piezoelectric substrate of lithium niobate or lithium tantalate and electrodes formed on the substrate for propagating surface acoustic waves. The substrate has a cut plane and a surface acoustic wave propagation direction which are (.phi., .theta., .psi.) as expressed in Eulerian angles and within ranges substantially equivalent thereto. When the substrate is made of lithium niobate, .phi., .theta. and .psi. are 0.degree.-86.degree. or 95.degree.-180.degree., 73.degree.-118.degree. and 0.degree.-44.degree., respectively. When the substrate is made of lithium tantalate, .phi., .theta. and .psi. are 0.degree.-87.degree. or 91.degree.-180.degree., 80.degree.-120.degree. and 0.degree.-44.degree., respectively. This enables the device to exhibit high performance.
    Type: Grant
    Filed: March 6, 1997
    Date of Patent: December 29, 1998
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Yasutaka Shimizu, Atsuhiro Nishikata, Shigetaka Tonami