Patents by Inventor Brian Walchuk

Brian Walchuk 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).

  • Anionic copolymers prepared in an inverse emulsion matrix
    Patent number: 7507781
    Abstract: A papermaking method and a composition which utilize, as a drainage aid, a water-soluble anionic copolymer prepared via a water-in-oil polymerization technique that, absent a cross-linking agent, is characterized by a Huggins' constant (k?) determined in 0.01M NaCl greater than 0.75 and a storage modulus (G?) for a 1.5 wt. % actives polymer solution at 4.6 Hz greater than 175 Pa.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: March 24, 2009
    Assignee: Hercules Incorporated
    Inventors: Brian Walchuk, Fushan Zhang, John C. Harrington, William Sean Carey, Richard Lee Brady
  • Anionic copolymers prepared in an inverse emulsion matrix and their use in preparing cellulosic fiber compositions
    Publication number: 20070265358
    Abstract: A papermaking method and a composition which utilize, as a drainage aid, a water-soluble anionic copolymer prepared via a water-in-oil polymerization technique that, absent a cross-linking agent, is characterized by a Huggins' constant (k?) determined in 0.01M NaCl greater than 0.75 and a storage modulus (G?) for a 1.5 wt. % actives polymer solution at 4.6 Hz greater than 175 Pa.
    Type: Application
    Filed: July 23, 2007
    Publication date: November 15, 2007
    Inventors: Brian Walchuk, Fushan Zhang, John Harrington, William Carey, Richard Brady
  • Anionic copolymers prepared in an inverse emulsion matrix and their use in preparing cellulosic fiber compositions
    Patent number: 7250448
    Abstract: A papermaking method and a composition which utilize, as a drainage aid, a water-soluble anionic copolymer prepared via a water-in-oil polymerization technique that, absent a cross-linking agent, is characterized by a Huggins' constant (k?) determined in 0.01M NaCl greater than 0.75 and a storage modulus (G?) for a 1.5 wt. % actives polymer solution at 4.6 Hz greater than 175 Pa.
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: July 31, 2007
    Assignee: Hercules Incorporated
    Inventors: Brian Walchuk, Fushan Zhang, John C. Harrington, William Sean Carey, Richard Lee Brady
  • Anionic copolymers prepared in an inverse emulsion matrix and their use in preparing cellulosic fiber compositions
    Publication number: 20040102528
    Abstract: A papermaking method and a composition which utilize, as a drainage aid, a water-soluble anionic copolymer prepared via a water-in-oil polymerization technique that, absent a cross-linking agent, is characterized by a Huggins' constant (k′) determined in 0.01M NaCl greater than 0.75 and a storage modulus (G′) for a 1.5 wt. % actives polymer solution at 4.6 Hz greater than 175 Pa.
    Type: Application
    Filed: December 6, 2002
    Publication date: May 27, 2004
    Inventors: Brian Walchuk, Fushan Zhang, John C. Harrington, William Sean Carey, Richard Lee Brady