Patents by Inventor Karl Hammerschmidt

Karl Hammerschmidt 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).

  • White opaque barrier layer film with excellent lay-flat properties
    Patent number: 5449552
    Abstract: The invention relates to a multilayer composite film consisting of a surface layer A, a gas barrier layer C, a heat sealing layer D and, optionally, adhesive or coupling layers B, the individual layers being arranged as follows in the composite film:A a biaxially stretched, white opaque polypropylene film,B an adhesive or coupling layer,C a gas barrier layer with a permeability to oxygen of at most 30 Ncm.sup.3 /m.sup.2 d bar (23.degree. C./0% relative humidity),B an adhesive or coupling layer,D a heat sealing layer,layers A and C optionally being interchangeable.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: September 12, 1995
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Richarda Bochow, Heiko Tamke, Karl Hammerschmidt