Patents by Inventor Yong Joon Cha

Yong Joon Cha 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).

  • Process for preparing water-in-oil type emulsion cosmetic composition containing L-ascorbic acid with improved stability
    Patent number: 6346257
    Abstract: Disclosed is a process for preparing water-in-oil type emulsion cosmetic compositions containing L-ascorbic acid. The use of 2-hydroxypropyl cyclodextrin and a water-in-oil type emulsion allow L-ascorbic acid itself to be preserved for a lengthy period of time with high functional maintenance. Even after being stored for a significant period of time, the water-in-oil type emulsion cosmetic compositions do not exhibit discoloration nor give out offensive odor nor show the separation of cosmetic ingredients. In addition, the cosmetic compositions keep L-ascorbic acid high in the effective whitening activity, such as melanin reduction and inhibitory activity against tyrosinase.
    Type: Grant
    Filed: November 4, 1999
    Date of Patent: February 12, 2002
    Assignees: Skinplus Co., LTD, Cosmax Co., Ltd.
    Inventors: Hun Jin Lee, Jeoung Woung Hwang, Yong Joon Cha