Patents by Inventor George L. Roberts

George L. Roberts 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).

  • 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
  • Titanium dioxide slurries from recycle material
    Patent number: 4170485
    Abstract: High gloss titanium dioxide pigment slurries are prepared by using the underflow from the thickener, optionally treated with aluminum oxide, plus an organic dispersant, plus optionally a polyol.
    Type: Grant
    Filed: August 22, 1978
    Date of Patent: October 9, 1979
    Assignee: American Cyanamid Company
    Inventors: David W. Blake, Gerard M. Sheehan, John D. Rowland, George L. Roberts