Patents by Inventor Melitta Krause

Melitta Krause 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).

  • No-rinse phosphating process
    Patent number: 5976272
    Abstract: A process for phosphating metal surfaces by treatment with an acidic zinc- and phosphathe-containing solution which does not require rinsing. The metal substrate is contacted with a phosphating solution containing 2 to 25 g/l of zinc ions, 2 to 25 g/l of manganese ions and 50 to 300 g/l of phosphate ions. The solution has a pH value of 1 to 3.6, a free acid content of 0 to 100 points, a total acid content of 40 to 400 points and a ratio of free acid to total acid of 1:4 to 1:20.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: November 2, 1999
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Reinhard Seidel, Bernd Mayer, Melanie Joppen, Melitta Krause, Joerg Riesop