Patents by Inventor Joanne M. Bartkus

Joanne M. Bartkus 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 of polymer impregnation
    Patent number: 5508060
    Abstract: Methods of impregnating various polymer substrates with an impregnation additive, by simultaneously contacting the polymer substrate with an impregnation additive, carrier liquid, and supercritical fluid are provided. The impregnation additive is substantially insoluble in the supercritical fluid, and the carrier liquid is preferably substantially insoluble in the supercritical fluid.
    Type: Grant
    Filed: September 19, 1994
    Date of Patent: April 16, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Craig A. Perman, Joanne M. Bartkus, Hye-Ok Choi, Manfred E. Riechert, Kelvin J. Witcher, Richard C. Kao, James S. Stefely, John E. Gozum