Patents by Inventor David E. Nightingale

David E. Nightingale 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).

  • Treatment of zinc plant leach residues for recovery of the contained metal values
    Patent number: 4225342
    Abstract: A process for treating zinc plant leach residues for the recovery of the lead, silver, and tin values contained therein is disclosed. The process includes the treatment of the zinc plant residue with concentrated sulphuric acid followed by water leaching and other hydrometallurgical steps to separately recover the lead, silver and tin.
    Type: Grant
    Filed: September 21, 1979
    Date of Patent: September 30, 1980
    Assignee: Texasgulf Inc.
    Inventors: George M. Freeman, David E. Nightingale