David John O'Callaghan

US Patent:

8273174, Sep 25, 2012

Filed:

Dec 31, 2008

Appl. No.:

12/347501

Inventors:

Sherry L Thomson - Normandy Park WA, US
David J O'Callaghan - Bonney Lake WA, US
John A Westland - Auburn WA, US
Bing Su - Federal Way WA, US

Assignee:

Wyerhaeuser NR Company - Federal Way WA

International Classification:

C04B 2/00
C04B 7/14
C04B 14/00
C04B 28/10
C04B 28/14
C04B 5/00
C04B 28/08
C04B 9/00
C04B 11/00
C04B 16/00
C04B 24/00
C04B 7/00
C04B 16/02
C04B 18/06
C04B 12/00
C04B 24/14
C04B 24/10

US Classification:

106805, 106618, 106619, 106686, 106705, 106772, 106778, 106780, 106790, 106797

Abstract:

A cement product incorporating nanocrystalline cellulose and cellulose fiber throughout the product and a method of making the product.

US Patent:

8293003, Oct 23, 2012

Filed:

Aug 9, 2012

Appl. No.:

13/571234

Inventors:

Sherry L. Thomson - Normandy Park WA, US
David J. O'Callaghan - Bonney Lake WA, US
John A. Westland - Auburn WA, US
Bing Su - Federal Way WA, US

Assignee:

Weyerhaeuser NR Company - Federal Way WA

International Classification:

C04B 2/00
C04B 7/14
C04B 14/00
C04B 28/10
C04B 28/14
C04B 5/00
C04B 28/08
C04B 9/00
C04B 11/00
C04B 16/00
C04B 24/00
C04B 7/00
C04B 16/02
C04B 18/06
C04B 12/00
C04B 24/14
C04B 24/10

US Classification:

106687, 106686, 106705, 106772, 106778, 106618, 106619, 106780, 106790, 106797

Abstract:

A cement product incorporating nanocrystalline cellulose and cellulose fiber throughout the product and a method of making the product.

US Patent:

8317914, Nov 27, 2012

Filed:

May 29, 2009

Appl. No.:

12/475206

Inventors:

Robert T Hamilton - Seattle WA, US
David J O'Callaghan - Bonney Lake WA, US
Hugh West - Seattle WA, US

Assignee:

Weyerhaeuer NR Company - Federal Way WA

International Classification:

C04B 16/02

US Classification:

106644, 106730, 428703, 52344, 156 39

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.

US Patent:

8435345, May 7, 2013

Filed:

Sep 28, 2010

Appl. No.:

12/892239

Inventors:

John A. Westland - Auburn WA, US
David J. O'Callaghan - Bonney Lake WA, US

Assignee:

Weyerhaeuser NR Company - Federal Way WA

International Classification:

C04B 28/14
C04B 40/00
C04B 9/04
D21F 11/00
D21H 11/00
D21H 13/00
D21H 15/00
D21H 17/00
D21H 19/00
D21H 21/00
D21H 23/00
D21H 25/00
D21C 9/00

US Classification:

106805, 106780, 106820, 162 9, 1621576, 162182

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.

US Patent:

20100300330, Dec 2, 2010

Filed:

May 29, 2009

Appl. No.:

12/475172

Inventors:

ROBERT T. HAMILTON - Seattle WA, US
David J. O'Callaghan - Bonney Lake WA, US
Hugh West - Seattle WA, US

Assignee:

WEYERHAEUSER NR COMPANY - Federal Way WA

International Classification:

C04B 16/02
C08K 7/02

US Classification:

106805, 524 4, 524 2

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.

US Patent:

20130000523, Jan 3, 2013

Filed:

Jun 13, 2012

Appl. No.:

13/495646

Inventors:

S. Ananda Weerawarna - Seattle WA, US
David J. O'Callaghan - Bonney Lake WA, US

Assignee:

WEYERHAEUSER NR COMPANY - Federal Way WA

International Classification:

C04B 16/02

US Classification:

106805

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.

US Patent:

20130213276, Aug 22, 2013

Filed:

Apr 5, 2013

Appl. No.:

13/857274

Inventors:

WEYERHAEUSER NR COMPANY - , US
David J. O'Callaghan - Bonney Lake WA, US

Assignee:

WEYERHAEUSER NR COMPANY - Federal Way WA

International Classification:

C04B 7/02

US Classification:

106728

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 autognous shrinkage of the cementitious material is reduced.