Patents by Inventor Andrew Newell

Andrew Newell 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).

  • Base metal mineral flotation processes
    Patent number: 5855770
    Abstract: A process for recovering a secondary base metal mineral from a material containing it involving treatment of a pulp of the material with surface modifying reagent such as a water soluble sulphide. The pulp is subjected to deaeration by introduction of a non-oxidising gas to prevent oxidation of the reagent. The process is applicable to recovery of secondary minerals such as azurite, malachite, cerussite, anglesite and zinc ferrites from host materials.
    Type: Grant
    Filed: November 24, 1995
    Date of Patent: January 5, 1999
    Assignee: Boc Gases Australia Limited
    Inventors: David Clark, Andrew Newell
  • Physical separation processes for mineral slurries
    Patent number: 5753104
    Abstract: A flotation process for the separation of a mineral of non-sulphidic character, such as a talcose mineral, from a mineral of sulphidic character, for example a base metal sulphide, characterized in that a slurry containing a mixture of the minerals is subjected to a sequence of mineral dressing operations in which a non-oxidizing gas or gas mixture and a reducing agent are added to the slurry to maintain an electrochemical potential conducive to the separation of the minerals by flotation.
    Type: Grant
    Filed: June 25, 1996
    Date of Patent: May 19, 1998
    Assignee: Boc Gases Australia Limited
    Inventors: Walter Hoecker, Andrew Newell