Patents by Inventor Eric C. Ward

Eric C. Ward 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).

  • Sulfur based corrosion inhibitors
    Patent number: 8123982
    Abstract: Alternative inhibitors that offer an improvement over tolyltriazole in inhibiting yellow metal corrosion. The dithiocarbamate compounds and their salts were compared to that of tolyltriazole under identical conditions. These comparative tests were conducted in common corrosion testing systems, using both electrochemical corrosion cells and pilot cooling rigs, using various water conditions. The test methods included electrochemical studies such as linear polarization resistance, open circuit potential versus time, Tafel and cyclic polarization.
    Type: Grant
    Filed: February 24, 2005
    Date of Patent: February 28, 2012
    Assignee: Akzo Nobel N.V.
    Inventors: Eric C. Ward, Alvie L. Foster, Jr., Michael L. Standish, Ivonne C. Weidner
  • Multifunctional calcium carbonate and calcium phosphate scale inhibitor
    Patent number: 7252770
    Abstract: The present invention is directed a multifunctional polymer capable of inhibiting both calcium carbonate and calcium phosphate scale. The multifunctional polymer contains at least one monomer unit from each of four groups: dicarboxylic acids, mono-carboxylic acids, nonionic monomers, and sulfonated or sulfated monomers. The polymer also inhibits many other alkaline earth scales, such as calcium sulfate scale and provides stabilization of minerals such as iron, zinc and manganese. The polymer is especially effective in highly stressed systems that contain high electrolyte concentrations and have a high number of cycles of concentration.
    Type: Grant
    Filed: May 2, 2006
    Date of Patent: August 7, 2007
    Assignee: National Starch and Chemical Investment Holding Corporation
    Inventors: Anne-Marie B. Austin, Eric C. Ward
  • Multifunctional calcium carbonate and calcium phosphate scale inhibitor
    Patent number: 7087189
    Abstract: The present invention is directed a multifunctional polymer capable of inhibiting both calcium carbonate and calcium phosphate scale. The multifunctional polymer contains at least one monomer unit from each of four groups: dicarboxylic acids, mono-carboxylic acids, nonionic monomers, and sulfonated or sulfated monomers. The polymer also inhibits many other alkaline earth scales, such as calcium sulfate scale and provides stabilization of minerals such as iron, zinc and manganese. The polymer is especially effective in highly stressed systems that contain high electrolyte concentrations and have a high number of cycles of concentration.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: August 8, 2006
    Assignee: National Starch Chemical Investment Holding Co
    Inventors: Anne-Marie B. Austin, Eric C. Ward
  • Multifunctional calcium carbonate and calcium phophate scale inhibitor
    Publication number: 20030173303
    Abstract: The present invention is directed a multifunctional polymer capable of inhibiting both calcium carbonate and calcium phosphate scale. The multifunctional polymer contains at least one monomer unit from each of four groups: dicarboxylic acids, mono-carboxylic acids, nonionic monomers, and sulfonated or sulfated monomers. The polymer also inhibits many other alkaline earth scales, such as calcium sulfate scale and provides stabilization of minerals such as iron, zinc and manganese. The polymer is especially effective in highly stressed systems that contain high electrolyte concentrations and have a high number of cycles of concentration.
    Type: Application
    Filed: March 18, 2002
    Publication date: September 18, 2003
    Inventors: Anne-Marie B. Austin, Eric C. Ward