Patents by Inventor Yuijin Ren

Yuijin Ren 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).

  • Method for forming highly colored polymeric bodies
    Patent number: 5942554
    Abstract: A method for the formation of a colored polymeric body which comprises subjecting a curable composition containing a color precursor and an onium salt to heat or actinic radiation to cure the composition, wherein the color precursor is converted to its colored form, and a curable composition capable of forming a colored polymeric body, are disclosed.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: August 24, 1999
    Assignee: Spectra Group Limited, Inc.
    Inventors: Yuijin Ren, Wolter Jager, Douglas C. Neckers