Patents by Inventor Thomas G. Shumate

Thomas G. Shumate 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).

  • Weight material for drilling fluids and method of creating and maintaining the desired weight
    Patent number: 6548452
    Abstract: Drilling fluid additives are designed to increase the density of drilling fluids while minimizing the increase in the resistance to flow of the drilling fluid. In particular, barite particles are added to the drilling fluid as a weight material where the barite particles include at least 85% by weight particles less than 75 microns and greater than 6 microns in equivalent spherical diameter.
    Type: Grant
    Filed: July 9, 2000
    Date of Patent: April 15, 2003
    Assignee: Halliburton Energy Services, Inc.
    Inventors: James A. Nattier, Thomas G. Shumate
  • Weight material for drilling fluids and method of creating and maintaining the desired weight
    Patent number: 6180573
    Abstract: Drilling fluid additives are designed to increase the density of drilling fluids while minimizing the increase in the resistance to flow of the drilling fluid. In particular, barite particles are added to the drilling fluid as a weight material where the barite particles include at least 85% by weight particles less than 75 microns and greater than 6 microns in equivalent spherical diameter.
    Type: Grant
    Filed: November 13, 1998
    Date of Patent: January 30, 2001
    Assignee: Dresser Industries, Inc.
    Inventors: James A. Nattier, Thomas G. Shumate
  • Oil-based well bore fluids and gellants therefor
    Patent number: 5021170
    Abstract: An invert emulsion drilling fluid comprised of a liquid oleaginous medium, water, an emulsifier and a gellant comprised of sulfonated ethylene/propylene/5-phenyl-2-norbornene terpolymer and an organophilic clay.
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: June 4, 1991
    Assignee: Baroid Technology, Inc.
    Inventors: Thomas G. Shumate, Louis P. Sokol