Patents by Inventor Keishi Yamasaki

Keishi Yamasaki 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).

  • Sustained-release prostaglandin I derivative preparation
    Patent number: 6656502
    Abstract: A sustained release preparation of prostaglandin I derivatives, which is highly safe and has stable drug-releasing and absorption properties, is disclosed. In the orally administrable preparation, the active component is a prostaglandin I derivative and the release-controlling component is a hydrogel base.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: December 2, 2003
    Assignee: Toray Industries, Inc.
    Inventors: Michio Hara, Yasuhide Horiuchi, Fuminori Tamura, Keishi Yamasaki