Patents by Inventor David Leslie Light

David Leslie Light 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).

  • Patent number: 7875151
    Abstract: A particulate product comprising kaolin produced from a method wherein the kaolin of a feed suspension is such that not more than 30% by weight has a particle size less than 2 ?m and not more than 30% by weight has a particle size greater than 10 ?m, wherein the kaolin of a product suspension produced is such that not more than 10% by weight has a particle size greater than 10 ?m and not more than 10% by weight has a particle size less than 0.25 ?m, and wherein the particulate product comprises kaolin produced from a fine fraction suspension.
    Type: Grant
    Filed: September 19, 2008
    Date of Patent: January 25, 2011
    Assignee: Imerys Minerals Ltd.
    Inventors: Philip Kenneth Johns, David Leslie Light
  • Publication number: 20090065163
    Abstract: A particulate product comprising kaolin produced from a method wherein the kaolin of a feed suspension is such that not more than 30% by weight has a particle size less than 2 ?m and not more than 30% by weight has a particle size greater than 10 ?m, wherein the kaolin of a product suspension produced is such that not more than 10% by weight has a particle size greater than 10 ?m and not more than 10% by weight has a particle size less than 0.25 ?m, and wherein the particulate product comprises kaolin produced from a fine fraction suspension.
    Type: Application
    Filed: September 19, 2008
    Publication date: March 12, 2009
    Inventors: Philip Kenneth Johns, David Leslie Light
  • Patent number: 7442281
    Abstract: There is provided a method of producing a kaolin particulate material suitable for use as an improved super-calendered filler. This method includes: (a) preparing an aqueous feed suspension of kaolin; (b) treating the kaolin of the feed suspension by attrition grinding in a vessel using grinding media granules; (c) delivering an aqueous suspension of the kaolin ground in (b) to a particle size classifier and separating the kaolin of the suspension into a coarse fraction and a fine fraction; (d) returning an aqueous suspension of the coarse fraction produced in (c) to the grinding vessel to be further attrition ground; and (e) extracting an aqueous suspension of the fine fraction produced in (c) as a product suspension. Advantageously, the kaolin of the feed suspension in (a) is such that not more than 30% by weight has a particle size less than 2 ?m and not more than 30% by weight has a particle size greater than 10 ?m.
    Type: Grant
    Filed: August 17, 2001
    Date of Patent: October 28, 2008
    Assignee: Imerys Minerals Limited
    Inventors: Philip Kenneth Johns, David Leslie Light
  • Publication number: 20040250973
    Abstract: There is provided a method of producing a kaolin particulate material suitable for use as an improved super-calendered filler. This method includes: (a) preparing an aqueous feed suspension of kaolin; (b) treating the kaolin of the feed suspension by attrition grinding in a vessel using grinding media granules; (c) delivering an aqueous suspension of the kaolin ground in (b) to a particle size classifier and separating the kaolin of the suspension into a coarse fraction and a fine fraction; (d) returning an aqueous suspension of the coarse fraction produced in (c) to the grinding vessel to be further attrition ground; and (e) extracting an aqueous suspension of the fine fraction produced in (c) as a product suspension. Advantageously, the kaolin of the feed suspension in (a) is such that not more than 30% by weight has a particle size less than 2 &mgr;m and not more than 30% by weight has a particle size greater than 10 &mgr;m.
    Type: Application
    Filed: November 7, 2003
    Publication date: December 16, 2004
    Inventors: Philip Kenneth Johns, David Leslie Light