Patents by Inventor John E. Borchardt

John E. Borchardt 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).

  • Enhancing the salt tolerance of aqueous sulfonate surfactant solutions
    Patent number: 4932473
    Abstract: In a process in which one or more alkyltoluene sulfonate surfactants are applied in solution in a saline aqueous liquid for purposes of enhanced oil recovery, the invention is the improvement which comprises incorporating into the said solution one or more alkylpolysaccharide surfactant in a quantity which is effective for enhancing the solubility of the alkyltoluene sulfonate surfactants in the aqueous solution. The invention is particularly effective for enhancing both the calcium and sodium salt tolerance of aqueous solutions of alkyl toluene sulfonate surfactants.
    Type: Grant
    Filed: December 29, 1988
    Date of Patent: June 12, 1990
    Assignee: Shell Oil Company
    Inventor: John E. Borchardt