Patents by Inventor David J O'Callaghan

David J O'Callaghan 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: 9056792
    Abstract: A method of curing cementitious material comprising added a fibrillated carboxyalkyl cellulose, cellulose alkylsulfonic acid, phosphorylated cellulose or sulfated cellulose having a degree of substitution of 0.01 to 0.45 to the material during mixing. The fibrillated carboxyalkyl cellulose, cellulose alkylsulfonic acid, phosphorylated cellulose or sulfated cellulose may also include bleached or partially bleached wood pulp fiber. The fibrillated carboxyalkyl cellulose, cellulose alkylsulfonic acid, phosphorylated cellulose or sulfated cellulose has a substituent content of from 10 to 150 meq/100 g cellulose fiber. The fibrillated carboxyalkyl cellulose, cellulose alkylsulfonic acid, phosphorylated cellulose or sulfated cellulose is 0.1 to 5% by weight of the dry weight of the cementitious material. The structure produced by the method. The autogenous shrinkage of the cementitious material is reduced.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: June 16, 2015
    Assignee: Weyerhaeuser NR Company
    Inventors: S. Ananda Weerawarna, David J. O'Callaghan
  • Patent number: 8435345
    Abstract: A method of curing cementitious material comprising added a carboxylated bleached wood pulp fiber to the material during mixing. The fiber has a carboxyl content of from 10 to 70 meq/100 g cellulose fiber. The fibers are 0.1 to 5% by weight of the dry weight of the cementitious material. The structure produced by the method. The autogenous shrinkage of the cementitious material is reduced.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: May 7, 2013
    Assignee: Weyerhaeuser NR Company
    Inventors: John A. Westland, David J. O'Callaghan
  • Publication number: 20130000523
    Abstract: A method of curing cementitious material comprising added a fibrillated carboxyalkyl cellulose, cellulose alkylsulfonic acid, phosphorylated cellulose or sulfated cellulose having a degree of substitution of 0.01 to 0.45 to the material during mixing. The fibrillated carboxyalkyl cellulose, cellulose alkylsulfonic acid, phosphorylated cellulose or sulfated cellulose may also include bleached or partially bleached wood pulp fiber. The fibrillated carboxyalkyl cellulose, cellulose alkylsulfonic acid, phosphorylated cellulose or sulfated cellulose has a substituent content of from 10 to 150 meq/100 g cellulose fiber. The fibrillated carboxyalkyl cellulose, cellulose alkylsulfonic acid, phosphorylated cellulose or sulfated cellulose is 0.1 to 5% by weight of the dry weight of the cementitious material. The structure produced by the method. The autogenous shrinkage of the cementitious material is reduced.
    Type: Application
    Filed: June 13, 2012
    Publication date: January 3, 2013
    Applicant: WEYERHAEUSER NR COMPANY
    Inventors: S. Ananda Weerawarna, David J. O'Callaghan
  • Patent number: 8317914
    Abstract: A building material product comprising a cementitious binder, an aggregate and cellulose reinforcing fibers wherein the cellulose reinforcing fibers have been treated with cationic or nonionic oil. The resulting fiber when included in a fiber cement composite results in improved deflection of the composite at peak loading as well as improved impact strength while maintaining overall board strength.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: November 27, 2012
    Assignee: Weyerhaeuer NR Company
    Inventors: Robert T Hamilton, David J O'Callaghan, Hugh West
  • Patent number: 8293003
    Abstract: A cement product incorporating nanocrystalline cellulose and cellulose fiber throughout the product and a method of making the product.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: October 23, 2012
    Assignee: Weyerhaeuser NR Company
    Inventors: Sherry L. Thomson, David J. O'Callaghan, John A. Westland, Bing Su
  • Patent number: 8273174
    Abstract: A cement product incorporating nanocrystalline cellulose and cellulose fiber throughout the product and a method of making the product.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: September 25, 2012
    Assignee: Wyerhaeuser NR Company
    Inventors: Sherry L Thomson, David J O'Callaghan, John A Westland, Bing Su
  • Patent number: 8241419
    Abstract: A building material product comprising a cementitious binder, an aggregate and cellulose reinforcing fibers wherein the cellulose reinforcing fibers have been treated with oil which is bound to the fiber by a retention aid. The resulting fiber when included in a fiber cement composite results in improved deflection of the composite at peak loading as well as improved impact strength while maintaining overall board strength.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: August 14, 2012
    Assignee: Weyerhaeuser NR Company
    Inventors: Robert T Hamilton, David J O'Callaghan, Hugh West
  • Publication number: 20110073015
    Abstract: A method of curing cementitious material comprising added a carboxylated bleached wood pulp fiber to the material during mixing. The fiber has a carboxyl content of from 10 to 70 meq/100 g cellulose fiber. The fibers are 0.1 to 5% by weight of the dry weight of the cementitious material. The structure produced by the method. The autogenous shrinkage of the cementitious material is reduced.
    Type: Application
    Filed: September 28, 2010
    Publication date: March 31, 2011
    Applicant: WEYERHAEUSER NR COMPANY
    Inventors: John A. Westland, David J. O'Callaghan
  • Publication number: 20100300329
    Abstract: A building material product comprising a cementitious binder, an aggregate and cellulose reinforcing fibers wherein the cellulose reinforcing fibers have been treated with cationic or nonionic oil. The resulting fiber when included in a fiber cement composite results in improved deflection of the composite at peak loading as well as improved impact strength while maintaining overall board strength.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 2, 2010
    Applicant: WEYERHAEUSER NR COMPANY
    Inventors: ROBERT T. HAMILTON, DAVID J. O'CALLAGHAN, HUGH WEST
  • Publication number: 20100300330
    Abstract: A building material product comprising a cementitious binder, an aggregate and cellulose reinforcing fibers wherein the cellulose reinforcing fibers have been treated with oil which is bound to the fiber by a retention aid. The resulting fiber when included in a fiber cement composite results in improved deflection of the composite at peak loading as well as improved impact strength while maintaining overall board strength.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 2, 2010
    Applicant: WEYERHAEUSER NR COMPANY
    Inventors: ROBERT T. HAMILTON, David J. O'Callaghan, Hugh West
  • Publication number: 20100162926
    Abstract: A cement product incorporating nanocrystalline cellulose and cellulose fiber throughout the product and a method of making the product.
    Type: Application
    Filed: December 31, 2008
    Publication date: July 1, 2010
    Applicant: WEYERHAEUSER COMPANY
    Inventors: Sherry L. Thomson, David J. O'Callaghan, John A. Westland, Bing Su