Patents by Inventor Johann Duchac

Johann Duchac 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).

  • Noble metal preparations and lustring preparations for direct and indirect screen printing
    Publication number: 20050153144
    Abstract: Noble metal preparations or lustre preparations which contain at least one polyaminoamide whose amino groups have preferably been inactivated, have a particularly advantageous stability in storage.
    Type: Application
    Filed: December 13, 2004
    Publication date: July 14, 2005
    Applicant: W.C. Heraeus GmbH
    Inventors: Annette Lukas, Sabine Wissel, Gunter Werner, Patrick Wenzel, Johann Duchac