Patents by Inventor Gregor Grauvogl

Gregor Grauvogl 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).

  • Security document and method of producing it
    Patent number: 5820971
    Abstract: A security document such as a bank note, identity card or the like, includes at least one multilayer security element made of at least two layers of reaction lacquer or adhesive between which diffraction structures, in particular holographic structures, exist in the form of a relief. A reflective layer is additionally disposed between the layers of lacquer. The reaction lacquer of adhesive is the type curable or cross-linkable under physical (e.g. radiation) and/or chemical activation.
    Type: Grant
    Filed: October 27, 1995
    Date of Patent: October 13, 1998
    Assignee: Giesecke & Devrient GmbH
    Inventors: Wittich Kaule, Gregor Grauvogl