Patents by Inventor Wolf-Rudiger Depiereux

Wolf-Rudiger Depiereux 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 electrochemically roughening aluminium surfaces in the manufacture of offset printing plates
    Patent number: 4564429
    Abstract: In a method of electrochemically roughening aluminium surfaces in the manufacture of offset printing plates, use is made of an electrolyte containing nitric acid, boric acid and water. Alternating current is employed and the material to be roughened is passed as a continuous band through the electrolyte. The electrolyte contains from three to fifteen g/l of aluminium. The current density employed is between 15 and 90 A/dm.sup.2.
    Type: Grant
    Filed: October 9, 1984
    Date of Patent: January 14, 1986
    Inventor: Wolf-Rudiger Depiereux