Patents by Inventor Gunther Zscherpe

Gunther Zscherpe 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).

  • Marking substance and security markings for testing the authenticity of documents
    Patent number: 7367592
    Abstract: The invention relates to a marking substance for security documents of the kind difficult to discern by counterfeiters. The preferred marking substance is polyethylene dioxythiophene polystyrene sulfonate and, more particularly, PEDT/PSS of the CPP105 formulation.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: May 6, 2008
    Assignee: WHD Elektronische Prueftechnik GmbH
    Inventors: Frank Puttkammer, Monika Puttkammer, Gunther Zscherpe