Patents by Inventor Ralph W. Pickering

Ralph W. Pickering 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).

  • Electric smelting of lead sulphate residues
    Patent number: 4135912
    Abstract: A process for treatment of lead residues, without prior sintering, in which residues more than 70% of the lead is present as lead sulphates, comprising addition of the said residues, together with a reductant containing carbon and together with fluxes that will react to provide a slag containing FeO, CaO and SiO.sub.2, directly to an electric furnace operating at a temperature of 1000 to 1500.degree. C in the slag layer to produce in the furnace a lead bullion. The expression "lead sulphates" will be understood to include lead sulphate and other compounds containing lead and the sulphate ion, for example, the basic lead sulphates.
    Type: Grant
    Filed: February 24, 1977
    Date of Patent: January 23, 1979
    Assignees: Electrolytic Zinc Company of Australia Limited, Mitsubishi Metal Corporation
    Inventors: Ian G. Matthew, Ralph W. Pickering, Takashi Suzuki, Hisashi Uchida