Patents by Inventor David M. Giddings

David M. Giddings 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).

  • Calcium tolerant deflocculant for drilling fluids
    Patent number: 4770795
    Abstract: A high calcium containing drilling fluid having a 0.1-10 pounds per barrel of a deflocculant which is a water-soluble acrylic polymer which contains from 5-50 mole percent of one or more of the following:Sulfoethyl acrylamide; orAcrylamide and Sulfoethyl acrylamide; orEthyl acrylate and Sulfoethyl acrylamide; orAcrylamide and Sulfophenyl acrylamide; orAcrylamide and Sulfomethyl acrylamide.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: September 13, 1988
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Dodd W. Fong
  • Terpolymer composition for aqueous drilling fluids
    Patent number: 4678591
    Abstract: A method of improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising:______________________________________ Ingredients % by weight ______________________________________ NaAMPS 72-3.8 N,N--dimethylacrylamide 13.5-0.7 Acrylonitrile 9.5-0.5 ______________________________________said composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the lignin, modified lignin, brown coal or modified brown coal having been present during the polymerization of the water-soluble polymer.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: July 7, 1987
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Charles D. Williamson
  • Terpolymers of 2-acrylamido-2-methylpropane-sulfonic acid, sodium salt (AMPS), N,N-dimethylacrylamide, and acrylonitrile
    Patent number: 4555558
    Abstract: Novel water-soluble terpolymers comprising:______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 51-59 sulfonic acid, sodium salt (AMPS) N,N--dimethylacrylamide 6-28 acrylonitrile 20-35 ______________________________________These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.
    Type: Grant
    Filed: October 25, 1984
    Date of Patent: November 26, 1985
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Donald G. Ries, Allen R. Syrinek
  • Water-soluble polymers containing 2-acrylamido-2-methylpropane-sulfonic acid, sodium salt (AMPS)-acrylamide-N,N-diallylacetamide
    Patent number: 4544719
    Abstract: Novel water-soluble terpolymers comprising:______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 57-61 sulfonic acid, sodium salt (AMPS) acrylamide 20-35 N,N--diallylacetamide 4-23 ______________________________________These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.
    Type: Grant
    Filed: October 26, 1984
    Date of Patent: October 1, 1985
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Donald G. Ries, Allen R. Syrinek
  • Water-soluble terpolymers of 2-acrylamido-2-methylpropane-sulfonic acid, sodium salt (AMPS), n-vinylpyrrolidone and acrylonitrile
    Patent number: 4544722
    Abstract: Novel water-soluble terpolymers comprising:______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 58-77 sulfonic acid, sodium salt (AMPS) N--vinylp;yrrolidone 2-20 acrylonitrile 4-36 ______________________________________These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.
    Type: Grant
    Filed: October 25, 1984
    Date of Patent: October 1, 1985
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Donald G. Ries, Allen R. Syrinek
  • Terpolymers for use as high temperature fluid loss additive and rheology stabilizer for high pressure, high temperature oil well drilling fluids
    Patent number: 4502966
    Abstract: Novel water-soluble terpolymers comprising:______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 57-61 sulfonic acid, sodium salt (AMPS) acrylamide 20-35 N,N--diallylacetamide 4-23 ______________________________________These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.
    Type: Grant
    Filed: September 9, 1983
    Date of Patent: March 5, 1985
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Donald G. Ries, Allen R. Syrinek
  • Terpolymers for use as high temperature fluid loss additive and rheology stabilizer for high pressure, high temperature oil well drilling fluids
    Patent number: 4502965
    Abstract: Novel water-soluble terpolymers comprising:______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 58-77 sulfonic acid, sodium salt (AMPS) N--vinylpyrrolidone 2-20 acrylonitrile 4-36 ______________________________________These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.
    Type: Grant
    Filed: September 9, 1983
    Date of Patent: March 5, 1985
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Donald G. Ries, Allen R. Syrinek
  • Terpolymers for use as high temperature fluid loss additive and rheology stabilizer for high pressure, high temperature oil well drilling fluids
    Patent number: 4502964
    Abstract: Novel water-soluble terpolymers comprising:______________________________________ Ingredients Mole % ______________________________________ 2-acrylamido-2-methylpropane- 51-59 sulfonic acid, sodium salt (AMPS) N,N--dimethylacrylamide 6-28 acrylonitrile 20-35 ______________________________________These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.
    Type: Grant
    Filed: September 9, 1983
    Date of Patent: March 5, 1985
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Donald G. Ries, Allen R. Syrinek
  • Terpolymer composition for aqueous drilling fluids
    Patent number: RE33855
    Abstract: A method of improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising:______________________________________ Ingredients % by weight ______________________________________ NaAMPS 72-3.8 N,N-dimethylacrylamide 13.5-0.7 Acrylonitrile 9.5-0.5 ______________________________________said composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the lignin, modified lignin, brown coal or modified brown coal having been present during the polymerization of the water-soluble polymer.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: March 24, 1992
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Charles D. Williamson
  • Terpolymer compositions for aqueous drilling fluids
    Patent number: RE33856
    Abstract: A method of improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising:______________________________________ Ingredients % by weight ______________________________________ NaAMPS 72-3.8 N,N-dimethylacrylamide 13.5-0.7 Acrylonitrile 9.5-0.5 ______________________________________said composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the lignin, modified lignin, brown cell or modified brown coal having been present during the polymerization of the water-soluble polymer.
    Type: Grant
    Filed: January 15, 1988
    Date of Patent: March 24, 1992
    Assignee: Nalco Chemical Company
    Inventors: David M. Giddings, Charles D. Williamson