Patents by Inventor Keith Richard Zone

Keith Richard Zone 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).

  • AQUEOUS SOLUTION AND METHOD FOR THE FORMATION OF A PASSIVATION LAYER
    Publication number: 20140154525
    Abstract: The present invention generally relates to an aqueous solution for the formation of a passivation layer on a zinc layer or zinc-alloy layer. More particularly, the invention relates to the formation of a black passivation layer on a zinc layer or zinc-alloy layer, which passivation layer is substantially free of hexavalent chromium. Furthermore, the present invention relates to method for the formation of a passivation layer on a zinc layer or zinc-alloy layer, as well as a passivation layer on a zinc layer or zinc-alloy layer itself. The solution used contains trivalent chromium ions, nitrate ions, an organic acid and a dithioglycolate.
    Type: Application
    Filed: February 23, 2012
    Publication date: June 5, 2014
    Applicant: ENTHONE INC.
    Inventors: Rene Van Schaik, Keith Richard Zone