Patents by Inventor Richarda Bochow

Richarda Bochow 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
  • Metal-free barrier-layer films
    Patent number: 5230948
    Abstract: The invention relates to composite films having a particularly good barrier effect against gases and water vapor without a metal layer, for example of aluminum, having to be present.
    Type: Grant
    Filed: May 20, 1992
    Date of Patent: July 27, 1993
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Holger Preiss, Richarda Bochow, Klaus Lund
  • Tamperproof document and a process for producing the same
    Patent number: 4456667
    Abstract: The tamperproof document consists of a photographic material as information carrier which is laminated on one or both sides with a transparent foil. The foil is attached to the surface of the information carrier by a layer of adhesive containing poly-1,2-alkyleneimine. The document is eminently saft against falsification.
    Type: Grant
    Filed: July 26, 1982
    Date of Patent: June 26, 1984
    Assignee: Agfa-Gavaert Aktiengesellschaft
    Inventors: Richarda Bochow, Helmut Bergmann, Siegfried Eikemeier