Patents by Inventor Hermann Fricke

Hermann Fricke 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).

  • Process for phosphating metallic surfaces in nonaqueous phosphating baths
    Patent number: 4447273
    Abstract: A process for phosphating metallic surfaces in nonaqueous phosphating baths comprising low-boiling halogenated hydrocarbons, aqueous phosphoric acid as the phosphating agent, alcohols as the solubilizer, and, optionally, further known components, e.g., stabilizers, inhibitors, or accelerators, comprising dipping the workpieces to be phosphated at least twice for at least 10 seconds into the boiling phosphating bath and, in the interval, leaving them for at least 20 seconds in the gaseous phase.
    Type: Grant
    Filed: March 16, 1983
    Date of Patent: May 8, 1984
    Assignee: Chemische Werke Huels Aktiengesellschaft
    Inventors: Dieter J. Mueller, Hermann Fricke, Heinrich Spielbrink