Patents by Inventor Steve C. Harthun

Steve C. Harthun 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).

  • Patent number: 5762140
    Abstract: High viscosity well treating fluids having low friction pressure loss when pumped through tubular goods and methods of treating wells using such treating fluids are provided. The treating fluids basically comprise an aqueous fluid, a graft copolymer of hydroxyalkylcellulose and vinyl phosphonic acid, a salt containing a divalent cation and a basic compound for crosslinking the graft copolymer and causing the resulting crosslinked aqueous gel to undergo syneresis.
    Type: Grant
    Filed: November 4, 1996
    Date of Patent: June 9, 1998
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Mary Anne Hardy, Charles V. Hunt, Steve C. Harthun