Patents by Inventor Susan Easter

Susan Easter 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).

  • Heteropolysaccharide preparation and use thereof as a mobility control agent in enhanced oil recovery
    Patent number: 5236046
    Abstract: A variant strain of Agrobacter radiobacter has been found to produce a unique heteropolysaccharide containing D-galactose, D-glucose and pyruvic acid in approximate molar ratios of 2:15:2 in a seventeen member repeat unit having the structure shown below, wherein Glc represents D-glucose, Gal represents D-galactose and Pyr represents pyruvic acid, with the numerals indicating the positions of linkage in these ring structures. The heteropolysaccharide is useful in mobility control in oil reservoir formations, especially when crosslinked with trivalent metal cations (Cr.sup.3+, Al.sup.3+, Fe.sup.3+ or Ti.sup.3+) to form a gel which preferentially fills high permeability zones in such reservoirs.
    Type: Grant
    Filed: January 18, 1991
    Date of Patent: August 17, 1993
    Assignee: Texaco Inc.
    Inventors: Peter D. Robison, Arthur J. Stipanovic, Charles E. Stypulkoski, Nick C. Wan, Susan Easter