Patents by Inventor Klaus D. Bartkowski

Klaus D. Bartkowski 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).

  • Method of producing colored surfaces on parts of aluminum or aluminum alloy
    Patent number: 5102508
    Abstract: A method is described for producing colored surfaces on parts of aluminum or aluminum alloy which is characterized by the following process steps:1. The parts are pre-treated by degreasing or cleaning,2. The parts are electrolytically anodically/alkalinely brightened,3. The parts are electrolytically anodized with the use of direct current,4. The parts are electrolytically and/or organically colored, and5. The oxide layer on the parts is compacted.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: April 7, 1992
    Assignee: Gebr. Happich GmbH
    Inventors: Klaus D. Bartkowski, Peter Venn