Patents Assigned to Kemira, Inc.
  • Metal with ceramic coating and method
    Patent number: 5338577
    Abstract: A coated metal substrate with a ceramic composition and method which involves applying several layers of the following materials:a. stainless steelb. thermal shock resistant ceramic coating; andc. abrasion resistant ceramic material.Each layer of each material is applied by flame spray means to the metallic substrate which is at a temperature above 250.degree. F. but below 500.degree. F., which is then cooled to a temperature below 250.degree. F. before applying the next layer. Zirconium oxide is a preferred thermal shock resistant ceramic coating and aluminum oxide is the preferred abrasion resistant ceramic material.
    Type: Grant
    Filed: May 14, 1993
    Date of Patent: August 16, 1994
    Assignee: Kemira, Inc.
    Inventor: Jackie B. Burdette, II
  • 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
  • Preparation of pure titanium tetrachlorides and solutions of titanium tetrachlorides
    Patent number: 4783324
    Abstract: Method for reduction in metallic impurities in aqueous and anhydrous TiCl.sub.4. The method utilizes activated carbon to remove poisonous impurities such as antimony and arsenic, which allows use of the TiCl.sub.4 in pearlescent pigment production and cosmetics.
    Type: Grant
    Filed: February 3, 1987
    Date of Patent: November 8, 1988
    Assignee: Kemira, Inc.
    Inventors: Larry L. Walters, Bruce M. Anderson
  • 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