Patents by Inventor Yoshiko Iwamoto

Yoshiko Iwamoto 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).

  • &agr;-hydroxy fatty acid derivatives and external compositions containing the same
    Patent number: 6531143
    Abstract: An oily base, which has excellent stability, a low melting point and does not irritate the skin and an external composition which contains the oily base. The present invention is directed to an alpha-hydroxy fatty acid derivatives represented by the general formula (1): wherein R1 represents a straight-chain or branched alkyl group having 10 to 24 carbon atoms, R2 represents a straight-chain or branched alkyl group having 1 to 31 carbon atoms, and R3 represents a straight-chain or branched alkyl group having 11 to 31 carbon atoms, and an external composition contains at least one of the derivatives.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: March 11, 2003
    Assignee: Kanebo, Limited
    Inventors: Masafumi Yakumaru, Hiroko Nakatsugawa, Yoshiko Iwamoto, Takeshi Ikemoto