Patents by Inventor Shigenori Kumagaya

Shigenori Kumagaya 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).

  • Cosmetic composition containing spindle shaped fine particles of titanium dioxide
    Patent number: 6123927
    Abstract: This invention relates to a cosmetic composition having a UV blocking action in a wide region from UVB to UVA and capable of preventing erythema and melanism due to burning by the sun.The conventional fine particles of titanium dioxide are insufficient in the effect for blocking ultraviolet ray and, furthermore, the feeling to the skin becomes poorer, and the finish becomes powdery.This invention resides in the formulation, into a cosmetic composition, of spindle shaped fine particles of titanium dioxide having an average short diameter of 0.03 to 0.06 .mu.m, an average long diameter of 0.08 to 0.12 .mu.m, and an aspect ratio (long diameter/short diameter) of 2 to 4 or the spindle shaped fine particles and a metal oxide having an average particle size of 0.2 .mu.m or more.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: September 26, 2000
    Assignee: Shiseido Company, Ltd.
    Inventors: Katsuki Ogawa, Sadaki Takata, Shigenori Kumagaya