Patents by Inventor David R. Sparrow

David R. Sparrow 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).

  • Packaging seal layer
    Patent number: 5912084
    Abstract: A seal layer formed from a thermoplastic polymer blend comprising (a) a non-polar, non-ionomeric polyolefin, and (b) a polar ethylene copolymer having carbon monoxide functionality, and its use to adhere adjacent thermoplastic films together to form a package. Since the bonding strength of the thermoplastic films to one another and to the seal layer is greater than the internal cohesion strength of the seal layer itself, the seal layer provides for an easy open package.
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: June 15, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Karlheinz Hausmann, Hans Dieter Flieger, Heiko E. Schenck, David R. Sparrow