Patents by Inventor Kingsley F. Doig

Kingsley F. Doig 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 copper-nickel concentrates
    Patent number: 4067952
    Abstract: A process for the treatment of nickel-copper concentrates comprises the steps of leaching nickel selectively with a dilute hydrochloric acid solution, separating the leach solution from the residue, roasting the residue at a temperature sufficient to form at least about the stoichiometric quantity of sulphate to convert all the nickel present in the residue to nickel sulphate, leaching the roasted residue with water and precipitating any dissolved copper from the aqueous leach solution thus obtained.
    Type: Grant
    Filed: September 2, 1975
    Date of Patent: January 10, 1978
    Assignee: Anglo-Transvaal Consolidated Investment Company Limited
    Inventors: Willem H. Pittie, Kingsley F. Doig