Patents by Inventor Phyllis K. Holifield

Phyllis K. Holifield 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).

  • Inhibited acid system for acidizing wells
    Patent number: 5209859
    Abstract: An acid system for acidizing wells contains corrosion inhibitor additives which consist essentially of a metal selected from antimony and antimony mixtures, a quaternary compound, and a surfactant. The corrosion inhibitor is free of toxic acetylenic compounds.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: May 11, 1993
    Assignee: Exxon Chemical Patents, Inc.
    Inventors: Dennis A. Williams, Phyllis K. Holifield, James R. Looney, Lee A. McDougall
  • Method of inhibiting corrosion in acidizing wells
    Patent number: 5200096
    Abstract: Corrosion inhibitor additives are added directly to an aqueous acid solution used in acidizing subterranean formations. The additives comprise a bismuth compound, a quaternary compound, and a surfactant. The corrosion inhibitor is free of toxic Sb and acetylenic compounds.
    Type: Grant
    Filed: September 27, 1991
    Date of Patent: April 6, 1993
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Dennis A. Williams, Phyllis K. Holifield, James R. Looney, Lee A. McDougall
  • Corrosion inhibitor and method of use
    Patent number: 5130034
    Abstract: A corrosion inhibitor for an acid well treating composition includes first metal ions including Sb, Cu, and Bi complexed with a quaternary ammonium compound and second metal ions complexed with a quaternary ammonium compound. The complexed compounds may be prepared and introduced into the acid or the first metal ions may be introduced directly into the acid system.
    Type: Grant
    Filed: March 25, 1991
    Date of Patent: July 14, 1992
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Dennis A. Williams, Phyllis K. Holifield, James R. Looney, Lee A. McDougall
  • Method of inhibiting corrosion in acidizing wells
    Patent number: 5089153
    Abstract: Corrosion inhibitor additives are added directly to an aqueous acid solution used in acidizing subterranean formations. The additives consist essentially of a metal selected from antimony and antimony mixtures, a quaternary compound, and a surfactant. The corrosion inhibitor is free of toxic acetylenic compounds.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: February 18, 1992
    Inventors: Dennis A. Williams, Phyllis K. Holifield, James R. Looney, Lee A. McDougall
  • Corrosion inhibitor and method of use
    Patent number: 5002673
    Abstract: A corrosion inhibitor formulation for use in well treatig acids includes a highly polar aprotic solvent having dissolved therein (a) a complex of a metal compound and a quaternary ammonium compound and (b) a dispersant capable of dispersing the complex in the well treating acid solution.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: March 26, 1991
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Dennis A. Williams, Phyllis K. Holifield, James R. Looney, Lee A. McDougall