Patents by Inventor Paul D. Heilman

Paul D. Heilman 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).

  • Patent number: 4956241
    Abstract: A slip-coated thermoplastic film is disclosed wherein the slip coating applied is essentially an aqueous wax emulsion. The wax emulsion is preferably applied to a thermoplastic film such as polypropylene between the machine direction and transverse direction stretching process. The resultant slip-coated film has low haze, non-blocking, and consistently low coefficient of friction for good machinability.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: September 11, 1990
    Assignee: Mobil Oil Corporation
    Inventors: Shaw-Chang Chu, Paul D. Heilman, Kevin A. Kirk
  • Patent number: 4956233
    Abstract: A slip-coated thermoplastic film is disclosed wherein the slip coating applied is essentially an aqueous wax emulsion. The wax emulsion is preferably applied to a thermoplastic film such as polypropylene. The resultant slip-coated film has low haze, non-blocking, and consistently low coefficient of friction for good machinability.
    Type: Grant
    Filed: February 21, 1989
    Date of Patent: September 11, 1990
    Assignee: Mobil Oil Corporation
    Inventors: Shaw-Chang Chu, Paul D. Heilman, Kevin A. Kirk
  • Patent number: 4464157
    Abstract: The present invention relates to thermoplastic bag structures which are characterized by having a pair of carrying handles formed integrally with the bag walls and extending upwardly from opposite sides of the open mouth portion of the bag. Specifically, such handled bags are particularly characterized in having reinforced handle members where the handles comprise at least two layers of thermoplastic material, one of the layers imparting tensile strength to the individual layer and the other layer particularly employed to provide the requisite puncture and tear resistance necessary in such a bag structure.
    Type: Grant
    Filed: January 11, 1984
    Date of Patent: August 7, 1984
    Assignee: Mobil Oil Corporation
    Inventors: Gordon L. Benoit, Jack J. Donaldson, Paul D. Heilman