Patents by Inventor Walter Kuehhirt

Walter Kuehhirt 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).

  • Cathodic electrodeposition coating agents containing bismuth complexes, preparation and use thereof
    Patent number: 6811667
    Abstract: Waterborne CED coating agents containing resin solids and optionally pigments, fillers and/or conventional coating additives, wherein said CED coating agents contain at least one bismuth complex with ligands selected from the group consisting of hydroxyquinolines, 1,2-dioximes, 1,3-dioximes, and N,N′-diarylthiocarbazides and combinations thereof in an amount of 0.1 wt. % to 2.5 wt. %, calculated as bismuth and based on the resin solids.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: November 2, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ulrich Hermann, Walter Kuehhirt, Rudolf Schipfer
  • Cathodic electrodeposition coating agents containing bismuth complexes, preparation and use thereof
    Publication number: 20030164299
    Abstract: Waterborne CED coating agents containing resin solids and optionally pigments, fillers and/or conventional coating additives, wherein said CED coating agents contain at least one bismuth complex with ligands selected from the group consisting of hydroxyquinolines, 1,2-dioximes, 1,3-dioximes, and N,N′-diarylthiocarbazides and combinations thereof in an amount of 0.1 wt. % to 2.5 wt. %, calculated as bismuth and based on the resin solids.
    Type: Application
    Filed: March 4, 2002
    Publication date: September 4, 2003
    Inventors: Ulrich Hermann, Walter Kuehhirt, Rudolf Schipfer
  • Process for preparing multi-layer coatings on automotive bodies or automotive body parts
    Patent number: 6368719
    Abstract: A process for preparing a multi-layer coating on an electrically conductive automotive body or an electrically conductive automotive body part by applying a cathodic electrodeposition coating layer, optionally a further coating layer and an outer clear coating, in which the cathodic electrodeposition coating layer of a cathodic electrodeposition coating composition is applied which, as the cathodic electrodeposition binder, contains a seed polymer with an amine value of 30 to 100 mg KOH/g and a hydroxyl value of 50 to 200 mg KOH/g, which can be prepared by radical polymerisation of 70 to 97 wt-% of a monomer mixture comprising hydroxy-functional olefinically unsaturated monomer and amino-functional olefinically unsaturated monomer in the presence of 3 to 30 wt-% of an aminoepoxy resin.
    Type: Grant
    Filed: June 12, 2000
    Date of Patent: April 9, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ludwig Siever, Walter Kuehhirt, Klausjoerg Klein, Karl-Friedrich Doessel