Patents by Inventor Vladimir Aleksandrovich Pankov

Vladimir Aleksandrovich Pankov 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).

  • Wafer and surface acoustic wave device
    Patent number: 5821673
    Abstract: A surface acoustic wave device capable of exhibiting high temperature stability and being downsized. The device includes a wafer constructed of a trigonal lanthanum/gallium silicate crystal cut out at predetermined cut angles (.alpha., .beta.). Application of a predetermined voltage signal to the wafer permits a surface acoustic wave to be excited in the wafer and propagate in the wafer. Supposing that the crystal has three crystal axes including an X-axis (electric axis), a Y-axis (mechanical axis) and a Z-axis (optical axis), the wafer is cut out so that a normal line (n) on a surface of the wafer has the cut angle .alpha. defined to be 20.degree..ltoreq..alpha..ltoreq.40.degree. with respect to the Y-axis in a counterclockwise direction from the Y-axis in a Y-Z plane and a propagation direction (S) of the surface acoustic wave has the cut angle .beta. defined to be 35.degree..ltoreq..beta..ltoreq.70.degree.
    Type: Grant
    Filed: May 23, 1997
    Date of Patent: October 13, 1998
    Assignees: Santech Company LImited, Bunch Limited
    Inventors: Jury Vladimirovich Pisarevsky, Vladimir Nikolaevich Fedorets, Vladimir Aleksandrovich Pankov