Patents by Inventor Toshio Wakao

Toshio Wakao 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).

  • Voltmeter of the liquid crystal display type
    Patent number: 4259634
    Abstract: An improved voltmeter of the liquid crystal display type comprising an electrically insulated casing 4, a detecting electrode 9 secured to its forward end, a liquid crystal display element 1 within the casing electrically connected to said detecting electrode, a grounded electrode 12 within the casing electrically connected to said display element, and a window 14 at the rear end of said casing for detecting the operation of said display element therethrough. The improvement consists in the further inclusion of a piezoelectric unit 2 and a pressurizing mechanism 3 in the casing 4. The normal operation of said liquid crystal display element can be confirmed through said window by applying to said liquid crystal display element a voltage which is produced in said piezoelectric unit when it is flexed by said pressurizing mechanism.
    Type: Grant
    Filed: February 13, 1979
    Date of Patent: March 31, 1981
    Assignees: Dainippon Ink & Chemicals, Inc., Kawamura Institute of Chemical Research, Wakao Kogei Kabushiki Kaisha
    Inventors: Tsuneo Okamoto, Toshio Wakao