Patents by Inventor Chen Kan-Nan

Chen Kan-Nan 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 making a temporary color change on a plastic material
    Patent number: 5842905
    Abstract: A simple, general purpose temporary dyeing process for coloring plastic or plastic fabric is disclosed. A colorless, but pH sensitive indicator solution is applied to a plastic material, such as the hair of a fashion doll, without changing the hair color. A developer solution of a specific pH range is subsequently applied to the doll hair, thereby causing the color of the hair to change. As the hair dries and the developer solution evaporates, the hair returns to its original color.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: December 1, 1998
    Assignee: C.J. Associates, Ltd.
    Inventors: James S. W. Lee, Chiu Keung Kwan, Chiu Kien-Wan, Chen Kan-Nan