Patents by Inventor Earl R. Lawhorne

Earl R. Lawhorne 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 for the preparation of desulfurized titanium oxide hydrolysate of high purity
    Patent number: 5527469
    Abstract: A titanium oxide hydrolysate slurry prepared by the sulfate process is treated with either an alkali metal hydroxide or an alkali metal carbonate to solubilize the sulfur bound to the titanium at a temperature of from 60.degree. C. to 120.degree. C. and the slurry is treated with an organic acid to remove the alkali metal compounds present. This process produces titanium oxide hydrolysate of high purity.
    Type: Grant
    Filed: June 12, 1995
    Date of Patent: June 18, 1996
    Inventors: Earl R. Lawhorne, Woodford R. Brown, Jr.
  • Titanium dioxide with high purity and uniform particle size and method therefore
    Patent number: 4944936
    Abstract: High purity titanium dioxide having uniform controlled particle size and method therefor. Titanium tetrachloride is mixed with water to form titanium oxychloride, which in turn is precipitated from aqueous solution to form titanium dioxide.
    Type: Grant
    Filed: July 29, 1988
    Date of Patent: July 31, 1990
    Assignee: Kemira, Inc.
    Inventor: Earl R. Lawhorne
  • Preparation of pure titanium dioxide with anatase crystal structure from titanium oxychloride solution
    Patent number: 4923682
    Abstract: A method for producing titanium dioxide with an anatase crystal structure from a titanium oxychloride solution. Titanium tetrachloride is mixed with water to form titanium oxychloride, which in turn is mixed with an organic reagent, preferably sorbitol. The resulting solution is hydrolyzed, precipitated and calcined to form titanium dioxide with an anatase crystal structure.
    Type: Grant
    Filed: March 30, 1989
    Date of Patent: May 8, 1990
    Assignee: Kemira, Inc.
    Inventors: George L. Roberts, Earl R. Lawhorne
  • TiO.sub.2 for ceramic frits and glazes
    Patent number: 4781911
    Abstract: A titanium dioxide compositon suitable for incorporation into ceramic frit, and process for preparation thereof. A clarified titanium sulfate liquor is hydrolyzed and precipitated to yield relatively large and uniform-sized hydrolysate particles which are easily separated from the acidic liquor by filtration.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: November 1, 1988
    Assignee: Kemira, Inc.
    Inventor: Earl R. Lawhorne
  • Process for the reduction of the viscosity of high solids pigment slurries
    Patent number: 4536268
    Abstract: A process for the reduction of the viscosity of high solids pigment slurries is disclosed whereby the slurries are subjected to electrodialysis utilizing an ammonium salt or dilute acid solution as the anolyte.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: August 20, 1985
    Assignee: American Cyanamid Company
    Inventor: Earl R. Lawhorne
  • Use of ion exchange resins in preparation of high solid TiO.sub.2 slurries
    Patent number: 4227934
    Abstract: Titanium dioxide pigment slurries containing above 50 percent titanium dioxide are reduced in viscosity by treatment with an anion exchange resin.
    Type: Grant
    Filed: May 3, 1979
    Date of Patent: October 14, 1980
    Assignee: American Cyanamid Company
    Inventor: Earl R. Lawhorne