Patents by Inventor Brian Tear

Brian Tear 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).

  • Continuous processes for producing titanium dioxide pigments
    Patent number: 6695906
    Abstract: Titanium dioxide pigments having improved gloss and durability are disclosed. These pigments are prepared by continuous processes, where pH, temperature, and addition times of hydrous silica and alumina coatings are carefully controlled.
    Type: Grant
    Filed: April 12, 2001
    Date of Patent: February 24, 2004
    Assignee: Millennium Inorganic Chemicals, Inc.
    Inventors: Michael Hiew, Yarw-Nan Wang, Les Hamor, Brian Tear, Robert McIntyre
  • Titanium dioxide pigments with improved gloss and/or durability
    Patent number: 6656261
    Abstract: The present invention provides titanium dioxide pigments with improved gloss and/or durability. The titanium dioxide pigments are made by treating titanium dioxide with a plurality of metal salts under conditions suitable to form the titanium dioxide pigment having improved gloss and/or durability, wherein at least one metal salt is capable of providing a monovalent anion. Preferred pigments of the present invention are substantially-sulfate free.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: December 2, 2003
    Assignee: Millennium Inorganic Chemicals, Inc.
    Inventors: Brian Tear, John Stratton, Robert Burniston
  • Titanium dioxide pigments with improved gloss and/or durability
    Publication number: 20020166478
    Abstract: The present invention provides titanium dioxide pigments with improved gloss and/or durability. The titanium dioxide pigments are made by treating titanium dioxide with a plurality of metal salts under conditions suitable to form the titanium dioxide pigment having improved gloss and/or durability, wherein at least one metal salt is capable of providing a monovalent anion. Preferred pigments of the present invention are substantially-sulfate free.
    Type: Application
    Filed: March 9, 2001
    Publication date: November 14, 2002
    Inventors: Brian Tear, John Stratton, Robert Burniston
  • Methods for producing titanium dioxide pigments having improved gloss at low temperatures
    Patent number: 6395081
    Abstract: The present invention provides methods of preparing a titanium dioxide pigment having improved gloss properties which involves heating an aqueous slurry of base titanium dioxide pigment to a temperature below about 75° C., coating the base titanium dioxide pigment with a silica compound at a temperature below about 75° C. to form a silica coated titanium dioxide pigment; and coating the silica coated titanium dioxide pigment with an alumina compound at a temperature below about 75° C. to form the titanium dioxide pigment having improved gloss.
    Type: Grant
    Filed: November 3, 2000
    Date of Patent: May 28, 2002
    Assignee: Millennium Inorganic Chemical, Inc.
    Inventors: Michael Hiew, Yarw-Nan Wang, Les Hamor, Brian Tear, Robert McIntyre
  • Continuous processes for producing titanium dioxide pigments
    Publication number: 20020017221
    Abstract: Titanium dioxide pigments having improved gloss and durability are disclosed. These pigments are prepared by continuous processes, where pH, temperature, and addition times of hydrous silica and alumina coatings are carefully controlled.
    Type: Application
    Filed: April 12, 2001
    Publication date: February 14, 2002
    Inventors: Michael Hiew, Yarw-Nan Wang, Les Hamor, Brian Tear, Robert McIntyre
  • Process for the production of aqueous dispersions of pigmentary titanium dioxide
    Patent number: 4448609
    Abstract: Stable high concentration aqueous slurries of pigmentary metal oxide particles having a hydrous oxide surface-treatment comprising alumina, for example alumina surface-treated pigmentary titanium dioxide, may be formed by the use of a specified combination of anionic and amine dispersants and a milling in the presence of grinding elements, for example in a sand mill, to develop suitable viscosity and gloss characteristics. The slurries may show thixotropic properties and are suitable for incorporation in vinyl silk aqueous emulsion paints.
    Type: Grant
    Filed: March 25, 1982
    Date of Patent: May 15, 1984
    Assignee: Laporte Industries Limited
    Inventors: Brian Tear, David G. Othen