Patents by Inventor Marion S. Cooley

Marion S. Cooley 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 imparting a dark patina to low-melting metal articles
    Patent number: 3930898
    Abstract: A process for imparting a dark patina to the surface of an article formed from a low-melting alloy metal, the alloy metal being an alloy metal of two or more metals selected from the group consisting of Bi, Pb, Sn and Cd, comprising exposing the alloy metal surfaces of said article to an acid solution of a copper salt.
    Type: Grant
    Filed: December 17, 1973
    Date of Patent: January 6, 1976
    Inventor: Marion S. Cooley