Patents by Inventor Richard G. Hollis

Richard G. Hollis 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).

  • Patent number: 4909839
    Abstract: Disclosed is a method for recovering lead from a scrap which contains lead oxide, lead sulfate and antimony in an oxidized state. The method comprises the steps of:(a) continuously charging a refractory lined reaction vessel with the scrap together with a reductant effective for reducing lead oxide;(b) melting and agitating the charged material by means of a submerged lance at a temperature of from about 900.degree. C. to about 1150.degree. C. whereby some lead oxide of the scrap is reduced to form molten lead;(c) forming a slag layer above the molten lead produced in step (b);(d) maintaining an amount of lead oxide in the slag layer;(e) removing the molten lead, the removed lead having less than 0.5% by weight of antimony; and(f) concentrating as oxide in the slag layer the antimony oxide in the scrap.
    Type: Grant
    Filed: January 15, 1988
    Date of Patent: March 20, 1990
    Assignee: Mount Isa Mines Limited
    Inventor: Richard G. Hollis
  • Patent number: 4678507
    Abstract: Lead constituents may be removed from a dross to produce a copper matte low in lead assay by melting the dross at temperature in excess of 900.degree. C., allowing the molten dross to separate into a lead bullion layer and a matte layer, removing the lead bullion layer from the matte layer, then heating the matte layer to a temperature in excess of 1000.degree. C., and removing the lead sulphide therefrom as a fume.
    Type: Grant
    Filed: June 18, 1985
    Date of Patent: July 7, 1987
    Assignees: Mount Isa Mines Limited, Commonwealth Scientific & Industrial Organization
    Inventor: Richard G. Hollis