Patents by Inventor George K. Wai

George K. Wai 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).

  • Patent number: 7052579
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a cationic guar polymer, and (2) isobutylene/maleic anhydride copolymer. The invention also relates to a process for inhibiting pitch and stickies deposition in pulp and papermaking systems.
    Type: Grant
    Filed: August 5, 1996
    Date of Patent: May 30, 2006
    Assignee: Ashland Inc.
    Inventor: George K. Wai
  • Patent number: 6740199
    Abstract: The invention relates to a process for digesting woodchips used in papermaking. The process employs digester additive, which comprises a sultaine or mixtures of a sultaine with a nonionic surfactant selected from the group consisting of (a) polyglycosides, (b) polyoxyalkylene glycols, and (c) mixtures thereof as digester additives. The digester additives are compatible and stable at elevated temperatures in the highly alkaline white liquor used in the digestion of woodchips into pulp. The invention also relates to the digester additive compositions.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: May 25, 2004
    Assignee: Ashland Inc.
    Inventors: Abdul Q. Khan, George K. Wai
  • Patent number: 6649023
    Abstract: The invention relates to a process for digesting woodchips used in papermaking. The process employs a digester additive, which is a mixture of (a) a polyglycoside, and (b) a polyoxyalkylene glycol. The digester additives are compatible and stable at elevated temperatures in the highly alkaline white liquor used in the digestion of wood chips into pulp. The invention also relates to the digester additive compositions.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: November 18, 2003
    Assignee: Ashland Inc.
    Inventors: George K. Wai, Abdul Q. Khan
  • Patent number: 6551452
    Abstract: The invention relates to a process for digesting woodchips used in papermaking. The process employs a digester additive, which is a mixture of (a) a polyglycoside, and (b) a polyoxyalkylene glycol. The digester additives are compatible and stable at elevated temperatures in the highly alkaline white liquor used in the digestion of woodchips into pulp. The invention also relates to the digester additive compositions.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: April 22, 2003
    Assignee: Ashland Inc.
    Inventors: George K. Wai, Abdul Q. Khan
  • Publication number: 20020121348
    Abstract: The invention relates to a process for digesting woodchips used in papermaking. The process employs a digester additive, which is a mixture of (a) a polyglycoside, and (b) a polyoxyalkylene glycol. The digester additives are compatible and stable at elevated temperatures in the highly alkaline white liquor used in the digestion of woodchips into pulp. The invention also relates to the digester additive compositions.
    Type: Application
    Filed: July 26, 2001
    Publication date: September 5, 2002
    Inventors: George K. Wai, Abdul Q. Khan
  • Publication number: 20020112828
    Abstract: The invention relates to a process for digesting woodchips used in papermaking. The process employs digester additive, which comprises a sultaine or mixtures of a sultaine with a nonionic surfactant selected from the group consisting of (a) polyglycosides, (b) polyoxyalkylene glycols, and (c) mixtures thereof as digester additives. The digester additives are compatible and stable at elevated temperatures in the highly alkaline white liquor used in the digestion of woodchips into pulp. The invention also relates to the digester additive compositions.
    Type: Application
    Filed: July 26, 2001
    Publication date: August 22, 2002
    Inventors: Abdul Q. Khan, George K. Wai
  • Patent number: 6051160
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a derivatized cationic guar, and (2) styrene maleic anhydride copolymer. The invention also relates to a process for inhibiting pitch deposition in pulp and papermaking systems and on papermaking equipment.
    Type: Grant
    Filed: April 15, 1998
    Date of Patent: April 18, 2000
    Assignee: Ashland Inc.
    Inventors: Linda M. Hlivka, George K. Wai
  • Patent number: 5744003
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a derivatized cationic guar, and (2) styrene maleic anhydride copolymer.
    Type: Grant
    Filed: July 30, 1996
    Date of Patent: April 28, 1998
    Assignee: Ashland Inc.
    Inventors: Linda M. Hlivka, George K. Wai
  • Patent number: 5702644
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in acid pulp and paper making operations comprising a derivatized cationic guar and an alkali metal polyacrylate dispersant. The invention also relates to a process for inhibiting pitch deposition on paper making equipment.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: December 30, 1997
    Assignee: Ashland Inc.
    Inventors: Linda M. Hlivka, George K. Wai
  • Patent number: 5618861
    Abstract: This invention relates to a liquid composition for the control of pitch deposition in pulp and paper making comprising an aqueous solution of (1) a derivatized cationic guar, and (2) a nonionic polymer.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: April 8, 1997
    Assignee: Ashland Inc.
    Inventors: Linda M. Hlivka, George K. Wai