Patents by Inventor Yuri Hirao

Yuri Hirao 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).

  • (3-.beta.), 4-.alpha., 16-.beta.)-16, -23, 28-trihdroxyolean-12-ene-3-yl-.beta.-D-glucopyranuronic acid derivatives, as glucose absorption inhibiting agents
    Patent number: 5843909
    Abstract: The present invention relates to (3.beta., 4.alpha.,16.beta.)-16,23,28-trihydroxyolean-12-ene-3-yl-.beta.-D-glucopyra nuronic acid derivatives and a method for preparing the same from Gymnema inodorum leaves, which comprises treating Gymnema inodorum leaves with an aqueous acid solution, extracting the leaves with an alcohol and/or water, concentrating the extract and subjecting to liquid-liquid partition extraction with water and 1-butanol, concentrating and drying/caking the 1-butanol phase under reduced pressure, defatting the cake, extracting soluble components from the cake with a high polar solvent, concentrating and drying/caking the extract to obtain a purified Gymnema inodorum leaf extract, and then applying the purified extract to HPLC to obtain fractions containing glucose absorption inhibiting substances.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: December 1, 1998
    Assignee: Kowa Chemical Industries Co., Ltd.
    Inventors: Mikito Atsuchi, Yuri Hirao, Yoshio Iwasaki