Patents by Inventor Erin A. S. Doherty

Erin A. S. Doherty 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).

  • Clay slurries and use thereof in pulp and papermaking applications
    Patent number: 8691052
    Abstract: The invention relates to a stable aqueous slurry composition comprising clay or clay-like material, hydrophobically associative polymer, and optionally a surfactant; and a method of inhibiting the deposition of organic contaminants in pulp and papermaking applications.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: April 8, 2014
    Assignee: Hercules Incorporated
    Inventors: Fushan Zhang, William S. Carey, Erin A. S. Doherty, John Todd Sarraf
  • Hydrophobically modified poly(aminoamides)
    Patent number: 8506757
    Abstract: Disclosed herein are hydrophobically-modified poly(aminoamides) useful as fixative detackifiers for stickies and pitch control in papermaking processes. These polymers are prepared via modification of amine-containing water-soluble poly(aminoamides) with reactive functional group-containing hydrophobic compounds. In particular, poly(aminoamides) may be modified, under appropriate reaction conditions, with long chain alkyl glycidyl ether, AKD (alkyl ketene dimer), ASA (alkyl succinyl anhydride), or Quab (3-chloro-2-hydroxypropyl-N,N,N-dimethylalkyl ammonium chloride). These novel polymers are effective in inhibiting deposition of organic contaminants in pulp and papermaking systems.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: August 13, 2013
    Assignee: Hercules Incorporated
    Inventors: Qu-Ming Gu, Lloyd A. Lobo, Erin A. S. Doherty, Huai N. Cheng
  • Hydrophobically modifed poly[ethylene glycol] for use in pitch and stickies control in pulp and papermaking processes
    Patent number: 8388806
    Abstract: Methods for inhibiting the depositions of organic contaminants from pulp in pulp and papermaking systems are disclosed. Hydrophobically modified poly[ethylene glycol] are added to the pulp or applied to deposition-prone surfaces of a papermaking system.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: March 5, 2013
    Assignee: Hercules Incorporated
    Inventors: Qu-Ming Gu, Huai N. Cheng, William S. Carey, Robert A. Gelman, Jennifer L. Rittenhouse-Pruss, Erin A. S. Doherty
  • Retention and drainage in the manufacture of paper
    Patent number: 8206553
    Abstract: A method of improving retention and drainage in a papermaking process is disclosed. The method provides for the addition of an associative polymer, prepared by an inverse emulsion polymerization process that utilizes multiple, discrete additions of initiator. Additionally, a process for preparation of an associative polymer, prepared by an inverse emulsion polymerization process that utilizes multiple discrete additions of initiator is disclosed.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: June 26, 2012
    Assignee: Hercules Incorporated
    Inventors: Robert A. Gelman, Erin A. S. Doherty
  • Hydrophobically Modified Poly(aminoamides)
    Publication number: 20100147476
    Abstract: Disclosed herein are hydrophobically-modified poly(aminoamides) useful as fixative detackifiers for stickies and pitch control in papermaking processes. These polymers are prepared via modification of amine-containing water-soluble poly(aminoamides) with reactive functional group-containing hydrophobic compounds. In particular, poly(aminoamides) may be modified, under appropriate reaction conditions, with long chain alkyl glycidyl ether, AKD (alkyl ketene dimer), ASA (alkyl succinyl anhydride), or Quab (3-chloro-2-hydroxypropyl-N,N,N-dimethylalkyl ammonium chloride). These novel polymers are effective in inhibiting deposition of organic contaminants in pulp and papermaking systems.
    Type: Application
    Filed: November 18, 2009
    Publication date: June 17, 2010
    Inventors: Qu-Ming GU, Lloyd A. Lobo, Erin A. S. Doherty, Huai N. Cheng
  • Clay slurries and use thereof in pulp and papermaking applications
    Publication number: 20090229775
    Abstract: The invention relates to a stable aqueous slurry composition comprising clay or clay-like material, hydrophobically associative polymer, and optionally a surfactant; and a method of inhibiting the deposition of organic contaminants in pulp and papermaking applications.
    Type: Application
    Filed: March 13, 2009
    Publication date: September 17, 2009
    Inventors: Fushan Zhang, William S. Carey, Erin A. S. Doherty, John Todd Sarraf