Patents by Inventor Holger Preiss

Holger Preiss 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).

  • 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
  • Composite films free from metal layers
    Patent number: 5145731
    Abstract: The composite film contains individual layers of polyvinyl alcohol, a polyolefin, an ethylene/vinyl alcohol and a polyolefin in that order and is comparable in its barrier properties to water vapor and gas with composite films containing metal layers without having any of their disadvantages.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: September 8, 1992
    Assignee: Wolff Walsrode AG
    Inventors: Klaus Lund, Holger Preiss
  • Readily peelable, sterilizable packages
    Patent number: 4766018
    Abstract: Readily peelable and sterilizable packages composed of two multi-layer sheets which are attached to one another by sealing in the zone regions and in which one sealing layer comprises an ethylene/1-butene copolymer and the other polypropylene or a propylene/ethylene copolymer.
    Type: Grant
    Filed: December 16, 1986
    Date of Patent: August 23, 1988
    Assignee: Wolff Walsrode AG
    Inventors: Thomas Hinrichsen, Holger Preiss, Harry Witte