Patents by Inventor Stephen J. Roden

Stephen J. Roden 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).

  • Recovery of gold and silver from complex refractory sulphide ores by cyanidisation and oxidation with peroxides
    Patent number: 5262136
    Abstract: A method of recovering precious metals from a silver bearing ore containing polybasite, pearcite, pyrargyrite, tetrahedrite or argentite by mixing the ore with an alkali metal or alkaline earth metal peroxide in slurry or solid, leaching the ore with a cyanide solution, and recovering the precious metals from the cyanide solution.
    Type: Grant
    Filed: December 24, 1991
    Date of Patent: November 16, 1993
    Assignee: CRA Services Limited
    Inventors: Trevor J. Smith, Michelle A. Spieth, Stephen J. Roden, Kevork A. Chouzadjian