Patents by Inventor Lev F. Verbov

Lev F. Verbov 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 forming aggregated kaolin pigment
    Patent number: 4976786
    Abstract: A method for forming a hydrothermally aggregated kaolin clay pigment, comprising preparing an aqueous slurry of particulate kaolin clay and sodium aluminate, having a total solids concentration of from about 2 to 25% by weight, the weight ratio between kaolin and aluminate being greater than 1; and hydrothermally treating the slurry in a closed system to form aggregates of adherent kaolin platelets.
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: December 11, 1990
    Assignee: ECC America Inc.
    Inventors: Weyman H. Dunaway, Lev F. Verbov
  • Method of preparing aggregated pigments from clays
    Patent number: 4971629
    Abstract: Aggregation of kaolin particles by wet processing using a hydrothermal technique is described. Calcined clay is first digested in a solution containing NaOH and the obtained sodium silicate solution is separated. Aggregation of uncalcined clay particles by hydrothermal treatment is then carried out using the obtained solution. The method enables aggregation of low grade clays unsuitable for calcination. A two-stage hydrothermal process is also described. Bleaching with oxygen or bleaching compounds may be effected during hydrothermal treatment.
    Type: Grant
    Filed: October 4, 1989
    Date of Patent: November 20, 1990
    Assignee: ECC America Inc.
    Inventors: Weyman H. Dunaway, Lev F. Verbov