Patents by Inventor Durai N. Raghavan

Durai N. Raghavan 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).

  • Consolidation of hydraulic fractures employing a polyurethane resin
    Patent number: 5048608
    Abstract: A composition and method for consolidating proppant or gravel for propping fractures about, or for gravel packs for sand control in, wells in subterranean formations characterized by an improvement in which there is used a urethane quasi prepolymer consisting of dipropylene glycol and excess polymeric methylene diphenylene diisocyanate in a diluent, allowing to stand to form oligomers of polyurethane chains and admixing the urethane quasi prepolymer and diluent with a proppant and oil-based frac fluid and admixing a catalyst with the admixture of proppant and prepolymer and allowing to stand in the fractures, or well, until consolidation occurs. Also disclosed are specific examples of satisfactory frac fluids, diluents and catalysts and appropriate procedures for consolidation in one- or two-passes.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: September 17, 1991
    Assignee: Atlantic Richfield Company
    Inventors: Robin Wiser-Halladay, Durai N. Raghavan
  • Lathanide series oxide modified alkaline-resistant glass
    Patent number: 4882302
    Abstract: The invention relates to alkaline resistant glasses, particularly glass fibers, which comprise silica, calcia and at least one lanthanide series metal oxide effective to enhance the alkali resistance of the glasses.
    Type: Grant
    Filed: May 19, 1988
    Date of Patent: November 21, 1989
    Assignee: Ensci, Inc.
    Inventors: Tetsuro Horiuchi, Arnold E. Goldman, Durai N. Raghavan