Patents by Inventor Marshal S. Evans

Marshal S. Evans 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 improving the color of a polymer
    Patent number: 5171762
    Abstract: The color of a polymer, particularly polytetrahydrofuran, is improved by subjecting the polymer to microwave energy of such magnitude and frequency so as to cause a decrease in the APHA color number.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: December 15, 1992
    Assignee: BASF Corporation
    Inventors: Daniel R. Miller, Marshal S. Evans