Patents by Inventor James Andrew Finch

James Andrew Finch 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).

  • Production of zinc oxide from acid soluble ore using precipitation method
    Patent number: 6726889
    Abstract: The present invention relates to an apparatus and a process for producing zinc oxide from an acid soluble zinc-bearing material. The process according to the present invention comprises the steps of leaching the zinc oxide material with sulphuric acid; precipitating iron and silica from the leach solution using calcium oxide; removing copper, cadmium and cobalt from the leach solution by cementation with zinc dust; precipitating zinc oxide from the leach solution using calcium oxide; and upgrading zinc content in zinc oxide precipitates by separating zinc oxide from gypsum using a flotation or granulometric sizing technique.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: April 27, 2004
    Assignee: Noranda, Inc.
    Inventors: Yeonuk Choi, Serge Payant, Joo Kim, Anna-Maria Giove, Ramachandra Rao, James Andrew Finch
  • Production of zinc oxide from acid soluble ore using precipitation method
    Publication number: 20030031611
    Abstract: The present invention relates to an apparatus and a process for producing zinc oxide from an acid soluble zinc-bearing material. The process according to the present invention comprises the steps of leaching the zinc oxide material with sulphuric acid; precipitating iron and silica from the leach solution using calcium oxide; removing copper, cadmium and cobalt from the leach solution by cementation with zinc dust; precipitating zinc oxide from the leach solution using calcium oxide; and upgrading zinc content in zinc oxide precipitates by separating zinc oxide from gypsum using a flotation or granulometric sizing technique.
    Type: Application
    Filed: July 22, 2002
    Publication date: February 13, 2003
    Inventors: Yeonuk Choi, Serge Payant, Joo Kim, Anna-Maria Giove, Ramachandra Rao, James Andrew Finch