Patents by Inventor John R. Purdy

John R. Purdy 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).

  • Multiple-layer polyolefin films
    Patent number: 4886698
    Abstract: A multiple-layer polyolefin film comprises a primary layer of an adhesive resin, such as an ethylene-vinyl acetate copolymer, and two secondary layers of an oriented propylene polymer, the thickness of the primary layer being less than 10% of the total film thickness.
    Type: Grant
    Filed: May 8, 1989
    Date of Patent: December 12, 1989
    Assignee: Imperial Chemical Industries PLC
    Inventor: John R. Purdy
  • Multiple-layer polyolefin films
    Patent number: 4565738
    Abstract: A composite multiple-layer film, suitable as a packaging film, having a base layer of a propylene polymer and at least one surface layer formed from a blend of a propylene-ethylene block copolymer and an ethylene-higher olefin random copolymer. The composite film is preferably coextruded and is suitable as a substrate for additional polymeric layer(s), such as heat-sealable coatings, which may be adhered to the substrate by a polymeric primer resin.
    Type: Grant
    Filed: May 22, 1984
    Date of Patent: January 21, 1986
    Assignee: Imperial Chemical Industries, PLC
    Inventor: John R. Purdy