Patents by Inventor John E. Dulson

John E. Dulson 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).

  • Zinc hydrometallurgical process
    Patent number: 4049514
    Abstract: Hydrometallurgical process for the recovery of copper arsenate from zinc plant cement copper residues and the use thereof in the purification of zinc electrolyte, with the attendant upgrading of the copper value in the treated cement copper residues.
    Type: Grant
    Filed: May 13, 1976
    Date of Patent: September 20, 1977
    Assignee: Texasgulf Canada Ltd.
    Inventors: George M. Freeman, John E. Dulson, Monica F. Morris