Patents by Inventor Gunther Luckhardt

Gunther Luckhardt 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 metals
    Patent number: 4559087
    Abstract: In a process for phosphating composite metals containing steel and zinc surfaces using phosphating solutions based on zinc phosphate by the dipping process, in order to achieve satisfactory formation of the phosphate layer, the composite metals are subjected to preliminary dipping for a maximum of 30 seconds in a phosphating solution based on zinc phosphate in order to initiate the formation of the phosphate layer, and are then conveyed to the main dip-phosphating zone.It is advantageous to spray the composite metals with a phosphating solution based on zinc phosphate while they are being conveyed from the preliminary to the main dip-phosphating zone, and it is advisable to limit the duration of the conveying and thus of the spraying treatment to a maximum of 30 seconds.
    Type: Grant
    Filed: April 17, 1984
    Date of Patent: December 17, 1985
    Assignee: Parker Chemical Company
    Inventors: Peter Jorns, Norbert Meyer, Werner Rausch, Josef Rothkegel, Gunther Luckhardt, Gudrun Volling