Patents by Inventor Eckart Schonfeler

Eckart Schonfeler 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 and solution for coating metal surfaces with a posphating solution containing water peroxide, produced metal object and use of said object
    Publication number: 20060278307
    Abstract: The invention relates to a method for the treatment or pre-treatment of surfaces of metal objects by means of an acidic, aqueous solution containing zinc and phosphate. Said invention is characterised in that the phosphating solution contains between 0.1-10 g/L zinc, 4-50 g/L phosphate calculated as PO4, between 0.03-3 g/L of at least one guanidine compound comprising at least one nitro group calculated as nitroguanidine, and between 0.001-0.9 g/L hydrogen peroxide and has a temperature of less than 80° C. The invention also relates to a corresponding acidic, aqueous composition.
    Type: Application
    Filed: May 17, 2004
    Publication date: December 14, 2006
    Inventors: Thomas Nitschke, Rudiger Rein, Eckart Schonfeler, Peter Schubach, Jurgen Specht