Patents by Inventor Kenneth Scott Teter

Kenneth Scott Teter 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).

  • Thermal reduction of fluoroether carboxylic acids or salts from fluoropolymer dispersions
    Patent number: 8329813
    Abstract: A process for reducing the fluoroether carboxylic acid or salt content of aqueous fluoropolymer dispersion. The fluoroether carboxylic acid or salt employed comprises fluoroether carboxylic acid or salt having the formula below: [R1—O-L-COO?]Y+ wherein R1 is a linear, branched or cyclic partially or fully fluorinated aliphatic group which may contain ether linkages; L is a branched partially or fully fluorinated alkylene group which may contain ether linkages; and Y+ is hydrogen, ammonium or alkali metal cation. The process comprises adding stabilizer to the aqueous fluoropolymer dispersion to form a stabilized aqueous fluoropolymer dispersion and heating the stabilized aqueous fluoropolymer dispersion to decarboxylate the fluoroether carboxylic acid or salt to produce a fluoroether byproduct. At least a portion of the fluoroether byproduct is removed.
    Type: Grant
    Filed: May 5, 2010
    Date of Patent: December 11, 2012
    Assignee: E I du Pont de Nemours and Company
    Inventors: David William Johnson, Kenneth Scott Teter
  • Thermal Reduction of Fluoroether Carboxylic Acids or Salts from Fluoropolymer Dispersions
    Publication number: 20100286330
    Abstract: A process for reducing the fluoroether carboxylic acid or salt content of aqueous fluoropolymer dispersion. The fluoroether carboxylic acid or salt employed comprises fluoroether carboxylic acid or salt having the formula below: [R1—O-L-COO?]Y+ wherein R1 is a linear, branched or cyclic partially or fully fluorinated aliphatic group which may contain ether linkages; L is a branched partially or fully fluorinated alkylene group which may contain ether linkages; and Y+ is hydrogen, ammonium or alkali metal cation. The process comprises adding stabilizer to the aqueous fluoropolymer dispersion to form a stabilized aqueous fluoropolymer dispersion and heating the stabilized aqueous fluoropolymer dispersion to decarboxylate the fluoroether carboxylic acid or salt to produce a fluoroether byproduct. At least a portion of the fluoroether byproduct is removed.
    Type: Application
    Filed: May 5, 2010
    Publication date: November 11, 2010
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: David William Johnson, Kenneth Scott Teter
  • Process for reducing fluorosurfactant content of fluropolymer dispersions using anionic surfactant-treated anion exchange resin
    Patent number: 7666929
    Abstract: A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion. The process includes providing a fixed bed of anion exchange resin having anion exchange groups with counter ions. The anion exchange resin is treated to replace at least some the counter ions with counter ions of non-fluorinated anionic surfactant. The stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion is passed through the treated fixed bed of anion exchange resin.
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: February 23, 2010
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Kenneth Scott Teter, David William Johnson
  • Process for reducing fluorosurfactant content of fluoropolymer dispersions using anionic surfactant-treated anion exchange resin
    Publication number: 20070282055
    Abstract: A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion. The process includes providing a fixed bed of anion exchange resin having anion exchange groups with counter ions. The anion exchange resin is treated to replace at least some the counter ions with counter ions of non-fluorinated anionic surfactant. The stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion is passed through the treated fixed bed of anion exchange resin.
    Type: Application
    Filed: May 22, 2007
    Publication date: December 6, 2007
    Inventors: Kenneth Scott Teter, David William Johnson