Patents by Inventor Chin-lu Chang

Chin-lu Chang 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).

  • Color reference chips system for plastics
    Patent number: 5746600
    Abstract: A color reference chips system for plastics has a sheet having a plurality of sets of holes, each set being provided with two holes, a first side of each hole receiving a color chip made of dyed plastic film whereby shade difference between the color chips is perceptible when light is shone from a second side of said hole. A plurality of chips can be bound together and enclosed by a portfolio.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: May 5, 1998
    Inventor: Chin-lu Chang