Patents by Inventor Hubert Venschott

Hubert Venschott 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).

  • Pretreatment before painting of composite metal structures containing aluminum portions
    Patent number: 6720032
    Abstract: In a process for the chemical pretreatment before painting of composite metal structures that contain aluminum or aluminum alloy portions together with steel, galvanized steel and/or alloy-galvanized steel portions, in a first step the metal structure is treated with a zinc phosphating solution that forms a surface-covering crystalline zinc phosphate layer on steel and on galvanized or alloy-galvanized steel, but without forming a zinc phosphate layer on the aluminum portions, and then in a second step the metal structure is brought into contact with a treatment solution that does not excessively dissolve the crystalline zinc phosphate layer on steel, galvanized and/or alloy-galvanized steel, but forms a conversion layer on the aluminum portions.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: April 13, 2004
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Peter Kuhm, Michael L. Sienkowski, Gerald J. Cormier, Matthias Hamacher, Jurgen Geke, Volkhard Enke, Jan-Willem Brouwer, Hubert Venschott