Patents Assigned to Stein, Hall & Co., Inc.
  • Hydrophobically modified hydroxybutyl ethers of polygalactomannan
    Patent number: 5233032
    Abstract: Polygalactomannans containing a hydroxybutyl ether substituent and a hydrophobic substituent can be used in the fracturing of subterranean formations.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: August 3, 1993
    Assignee: Stein, Hall & Co., Inc.
    Inventors: George M. Zody, Michael E. Morgan
  • Coating composition containing as thickeners polygalactomannans modified with hydrophilic and hydrophobic groups
    Patent number: 5179083
    Abstract: Water-borne coating compositions are made, using as a thickening agent, a polygalactomannan having both hydrophilic and hydrophobic substituents.
    Type: Grant
    Filed: July 5, 1990
    Date of Patent: January 12, 1993
    Assignee: Stein, Hall & Co., Inc.
    Inventors: George M. Zody, Michael E. Morgan
  • Filtration aids in uranium ore processing
    Patent number: 3932276
    Abstract: Improved flocculation efficiency and filtration of carbonate leached uranium ore pulps are obtained by incorporating hydroxyalkyl guars in the filter feed slurry.
    Type: Grant
    Filed: May 9, 1974
    Date of Patent: January 13, 1976
    Assignee: Stein, Hall & Co., Inc.
    Inventors: Harold L. Ford, Nathan M. Levine, Alan Robert Risdon