Patents by Inventor Franklin F. Clark

Franklin F. Clark 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).

  • Leaching of Ni-Cu-Fe-S matte
    Patent number: 4094754
    Abstract: Nickel is selectively leached efficiently and rapidly from Ni-Cu-Fe-S matte under oxidizing conditions at ordinary pressure by controlling in combination the following variables: (1) the acid-to-copper mole ratio in the leaching solution, (2) the temperature, and (3) the sulfur content of the matte, whereby an enriched nickel solution is obtained low in copper and iron.
    Type: Grant
    Filed: March 7, 1977
    Date of Patent: June 13, 1978
    Assignee: Amax Inc.
    Inventors: Raymond D. Symens, Paul B. Queneau, Eddie C. J. Chou, Franklin F. Clark
  • Separation of cobalt from nickel by ozonation in the presence of ammonium salts
    Patent number: 4034059
    Abstract: A method is provided for separating cobalt from a nickel solution containing cobalt in the cobaltous state and an ammonium salt comprising subjecting said solution containing at least 0.2 grams per liter of ammonium ion to ozonation while maintaining the pH thereof from about 4.5 to 6, until said cobalt has been oxidized to the cobaltic state and simultaneously precipitating said cobalt in the cobaltic state at a temperature ranging from about 10.degree. to 90.degree. C.
    Type: Grant
    Filed: July 19, 1976
    Date of Patent: July 5, 1977
    Assignee: Amax Inc.
    Inventors: Franklin F. Clark, Cvetko B. Nikolic, Paul B. Queneau