Patents by Inventor Yoshikazu Shirakawa

Yoshikazu Shirakawa 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).

  • Three layer composition for stablizing a denture
    Patent number: 4880702
    Abstract: A composition for stabilizing a denture in the form of a thin strip consisting of three layers, piled up one over another, which composition is characterized in that:(a) a swelling ability and solubility of outside layers are higher than those of an inside layer,(b) the swelled outside layers have an ability to adhere to gums and a denture base,(c) the inside layer has a self-supporting ability and a shape-retaining ability for the outside layers, and(d) the inside layer has an ability to adhere to the gums and the denture base after the outside layers have flowed away through dissolution.
    Type: Grant
    Filed: December 22, 1987
    Date of Patent: November 14, 1989
    Assignee: Shionogi & Co., Ltd.
    Inventors: Morio Homan, Nizo Sugie, Masakiyo Yoshimura, Yoshikazu Shirakawa