Patents by Inventor William J. Errington

William J. Errington 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).

  • High intensity lead smelting process
    Patent number: 4514222
    Abstract: Lead is obtained from lead sulfide ores or concentrates without prior sintering or roasting by the steps of adding the lead sulfide to a molten slag, injecting sufficient oxide to below the surface of the molten slag and vigorously agitating the slag whereby substantially to oxidize the lead sulfides to lead oxides, and then reducing the lead oxides. The slag is preferably agitated by means of a lance. The reduction stage may follow the oxidation stage in the same vessel or may be conducted in another vessel.
    Type: Grant
    Filed: November 18, 1982
    Date of Patent: April 30, 1985
    Assignee: Mount Isa Mines Limited
    Inventors: William T. Denholm, John M. Floyd, William J. Errington, Anthony N. Parry