Patents by Inventor Charles P. Evert

Charles P. Evert 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).

  • Differentially cross-linked multilayer film
    Patent number: 5055328
    Abstract: A tubular article formed of multilayer differentially cross-linked heat sealable film suitable for the manufacture of bags used in the packaging of meats. The multilayer film contains at least two layers the inner of which is a heat sealable layer containing an antioxidant cross-linking inhibitor in an amount sufficient to inhibit the cross-linking of that layer by irradiation. Accordingly, upon exposure of the multilayer film to radiation, the outer layer will be cross-linked to a greater extent than the first heat sealable layer.
    Type: Grant
    Filed: June 16, 1989
    Date of Patent: October 8, 1991
    Assignee: Viskase Corporation
    Inventors: Charles P. Evert, John Nelson