Patents by Inventor Douglas L. Mitchell

Douglas L. Mitchell 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: 5147696
    Abstract: A multiple-layer film comprises an oriented propylene polymer substrate with a heat-sealable layer comprising an ethylene polymer of density not exceeding 0.95 g cm.sup.-3 and containing a spherical, non-agglomerating additive of particle size not exceeding 5.0 .mu.m.Such films offer improved blocking- and abrasion-resistance, and are of utility in high-speed packaging operations.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: September 15, 1992
    Assignee: Imperial Chemical Industries PLC
    Inventors: Robert C. Lansbury, Douglas L. Mitchell
  • Patent number: 4384024
    Abstract: A multiple-layer heat-sealable film comprising a polyolefin substrate layer having on at least one surface thereof a heat-sealable layer comprising a random copolymer of propylene with from greater than 4 to 10 wt% of ethylene, the copolymer having a degree of randomness of greater than 2.5.
    Type: Grant
    Filed: May 19, 1981
    Date of Patent: May 17, 1983
    Assignee: Imperial Chemical Industries Limited
    Inventors: Douglas L. Mitchell, Robert C. Lansbury