Patents by Inventor Robert S. Hanzel

Robert S. Hanzel 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).

  • Spandex filaments containing certain metallic soaps
    Patent number: 4296174
    Abstract: Spandex filaments are provided with decreased tackiness by effective amounts of soap dispersed within the filaments. The soap is a metal salt of a fatty acid, the metal being calcium, lithium or magnesium and the fatty acid being a saturated or unsaturated fatty acid having 10 to 22 carbon atoms. Stearates are preferred.
    Type: Grant
    Filed: August 8, 1980
    Date of Patent: October 20, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robert S. Hanzel, Paul J. Sauer