Patents by Inventor Robert W. Kunkel

Robert W. Kunkel 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).

  • Purification of diphenyl phthalates
    Patent number: 4803295
    Abstract: Color properties of crude phenolic esters of aromatic dicarboxylic acids are improved by subjecting the esters to hydrogenation in the presence of hydrogen and a hydrogenation catalyst.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: February 7, 1989
    Assignee: Hoechst Celanese Corporation
    Inventors: A. Lee Stautzenberger, Robert W. Kunkel