Patents by Inventor Herbert J. Ward

Herbert J. Ward 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).

  • Heat-sealable polypropylene films
    Patent number: 4297415
    Abstract: A heat-sealable oriented polypropylene film comprising a base oriented polypropylene film having on one surface a layer of a random propylene/ethylene copolymer (ethylene content 2-6% by weight) and on the other surface a predominantly linear random copolymer of ethylene and a further alpha olefin having at least three carbon atoms per molecule (for example propylene and butene-1) the further alpha olefin content being 6-40% by weight. The film is particularly useful for packaging merchandise on horizontal form-fill-seal packaging machines.
    Type: Grant
    Filed: August 23, 1979
    Date of Patent: October 27, 1981
    Assignee: British Cellophane Limited
    Inventors: Herbert J. Ward, Derek J. Dobbie, Brian Lyall