Patents by Inventor William Limousin

William Limousin 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).

  • Method of treating an aqueous suspension of kaolin
    Patent number: 8545787
    Abstract: A method of treating a kaolin particulate material to improve one or more of its properties by removal of impurity particles therein which includes: producing a dispersed aqueous suspension of a kaolin particulate material containing at least 0.1% by weight, based on the dry weight of the kaolin particulate material of separable particulate impurity; diluting said dispersed aqueous suspension by adding a diluent thereto; adding a selective flocculation polymer to the diluted suspension; allowing the suspension containing the polymer to separate in a selective flocculation separator into layers comprising a flocculated product layer and a deflocculated impurity layer containing the separable impurity; and extracting the separated layers from the separator, wherein at least a portion of said deflocculated impurity layer is recirculated for use as at least a portion of the aforementioned diluent.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: October 1, 2013
    Assignee: Imerys Pigments, Inc.
    Inventors: Robert J. Pruett, Jim Richardson, William Limousin, Ismail Yildirim, Jun Yuan
  • Method of Treating an Aqueous Suspension of Kaolin
    Publication number: 20090317318
    Abstract: A method of treating a kaolin particulate material to improve one or more of its properties by removal of impurity particles therein which includes: producing a dispersed aqueous suspension of a kaolin particulate material containing at least 0.1% by weight, based on the dry weight of the kaolin particulate material of separable particulate impurity; diluting said dispersed aqueous suspension by adding a diluent thereto; adding a selective flocculation polymer to the diluted suspension; allowing the suspension containing the polymer to separate in a selective flocculation separator into layers comprising a flocculated product layer and a deflocculated impurity layer containing the separable impurity; and extracting the separated layers from the separator, wherein at least a portion of said deflocculated impurity layer is recirculated for use as at least a portion of the aforementioned diluent.
    Type: Application
    Filed: February 7, 2007
    Publication date: December 24, 2009
    Applicant: Imerys Pigments, Inc.
    Inventors: Robert J. Pruett, Jim Richardson, William Limousin, Ismail Yildirim, Jun Yuan