Patents by Inventor Kevin N Schwartz

Kevin N Schwartz 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).

  • Polymeric gel system and use in hydrocarbon recovery
    Patent number: 7575057
    Abstract: Coacervate gels having excellent shear viscosities and other properties are made with anionic or cationic polymers, a smaller amount of a surfactant having a charge opposite that of the polymer, and a hydrophobic alcohol. The Zeta Potential of the gel is maintained at an absolute value of at least 20. Optional gel promoting additives include betaines and amine oxides. A preferred gel comprises poly diallyl dimethyl ammonium chloride, a lesser amount of sodium lauryl sulfonate, and lauryl alcohol. The gels are particularly useful in well drilling fluids and well fracturing fluids.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: August 18, 2009
    Assignee: Clearwater International, L.L.C.
    Inventors: Kevin N. Schwartz, Kevin W. Smith, Shih-Ruey T. Chen
  • Friction reducing composition and method
    Patent number: 7205262
    Abstract: Water soluble nonionic friction reducers and added to coacervate gels having excellent shear viscosities and other properties. A preferred gel comprises poly diallyl dimethyl ammonium chloride, a lesser amount of sodium lauryl sulfonate, and lauryl alcohol. Excellent friction reducing properties are manifested; a particularly practical use for the compositions is in subterranean formation fracturing.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: April 17, 2007
    Assignee: Weatherford/Lamb, Inc.
    Inventors: Kevin N Schwartz, Kevin W. Smith