Patents by Inventor John A. Westland
John A. Westland 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: 6703125Abstract: The present invention provides cellulosic fibers having high wet bulk and methods for their preparation. In one embodiment, the invention provides cellulosic fibers catalytically crosslinked with glyoxal and, optionally, a glycol. In another embodiment, cellulosic fibers are crosslinked with a combination of glyoxal and a glyoxal-derived resin selected from the group consisting of a glyoxal/polyol condensate, a cyclic urea/glyoxal/polyol condensate, a cyclic urea/glyoxal condensate, and mixtures thereof.Type: GrantFiled: January 15, 2003Date of Patent: March 9, 2004Assignee: Weyerhaeuser.CompanyInventors: Richard A. Jewell, John A. Westland
-
Patent number: 6620865Abstract: Cellulosic fibers intrafiber crosslinked with a polymeric polycarboxylic acid crosslinking agent are disclosed. In one embodiment, the polymeric polycarboxylic acid is polyacrylic acid and, in another embodiment, the polycarboxylic acid is polymaleic acid. Methods for forming cellulosic fibers having stable intrafiber crosslinks and for forming crosslinked cellulosic fibers having low knot level are also disclosed.Type: GrantFiled: August 5, 2002Date of Patent: September 16, 2003Assignee: Weyerhaeuser CompanyInventors: John A. Westland, Richard A. Jewell, Amar N. Neogi
-
Publication number: 20030121623Abstract: Cellulosic fibers intrafiber crosslinked with a polymeric polycarboxylic acid crosslinking agent are disclosed. In one embodiment, the polymeric polycarboxylic acid is polyacrylic acid and, in another embodiment, the polycarboxylic acid is polymaleic acid. Methods for forming cellulosic fibers having stable intrafiber crosslinks and for forming crosslinked cellulosic fibers having low knot level are also disclosed.Type: ApplicationFiled: August 5, 2002Publication date: July 3, 2003Applicant: Weyerhaeuser CompanyInventors: John A. Westland, Richard A. Jewell, Amar N. Neogi
-
Publication number: 20030108742Abstract: The present invention provides cellulosic fibers having high wet bulk and methods for their preparation. In one embodiment, the invention provides cellulosic fibers catalytically crosslinked with glyoxal and, optionally, a glycol. In another embodiment, cellulosic fibers are crosslinked with a combination of glyoxal and a glyoxal-derived resin selected from the group consisting of a glyoxal/polyol condensate, a cyclic urea/glyoxal/polyol condensate, a cyclic urea/glyoxal condensate, and mixtures thereof.Type: ApplicationFiled: January 15, 2003Publication date: June 12, 2003Applicant: Weyerhaeuser CompanyInventors: Richard A. Jewell, John A. Westland
-
Patent number: 6572919Abstract: A crosslinkable cellulosic fibrous product that includes cellulosic fibers and a crosslinking agent is disclosed. The crosslinkable cellulosic fibrous product can be formed as a web or sheet that has structural integrity and sheet strength sufficient to permit the fibrous web to be rolled, transported, and used in rolled form in subsequent processes. The crosslinkable fibrous product can be converted into a crosslinked fibrous product by subjecting the product to conditions sufficient to effect intrafiber crosslinking. Alternatively, the web can be fiberized and the resulting individual crosslinkable fibers combined with other fibers and/or other materials to provide a fibrous web containing crosslinkable cellulosic fibers. Subjecting such a web to crosslinking conditions provides a fibrous web that includes, in addition to other fibers or materials, crosslinked cellulosic fibers.Type: GrantFiled: August 30, 2001Date of Patent: June 3, 2003Assignee: Weyerhaeuser CompanyInventors: John A. Westland, Colin Elston
-
Patent number: 6551706Abstract: The present invention provides cellulosic fibers having high wet bulk and methods for their preparation. In one embodiment, the invention provides cellulosic fibers catalytically crosslinked with glyoxal and, optionally, a glycol. In another embodiment, cellulosic fibers are crosslinked with a combination of glyoxal and a glyoxal-derived resin selected from the group consisting of a glyoxal/polyol condensate, a cyclic urea/glyoxal/polyol condensate, a cyclic urea/glyoxal condensate, and mixtures thereof.Type: GrantFiled: October 16, 2000Date of Patent: April 22, 2003Assignee: Weyerhaeuser CompanyInventors: Richard A. Jewell, John A. Westland
-
Publication number: 20030045707Abstract: The present invention provides a polymer derived from a cellulosic, lignocellulosic, or polysaccharide material having superabsorbent properties. Methods for making the polymer and personal care absorbent products that incorporated the polymer are also provided.Type: ApplicationFiled: August 5, 2002Publication date: March 6, 2003Applicant: Weyerhaeuser CompanyInventors: Hugh West, John A. Westland
-
Publication number: 20030008580Abstract: The present invention provides cellulosic fibers having high wet bulk and methods for their preparation. In one embodiment, the invention provides cellulosic fibers catalytically crosslinked with glyoxal and, optionally, a glycol. In another embodiment, cellulosic fibers are crosslinked with a combination of glyoxal and a glyoxal-derived resin selected from the group consisting of a glyoxal/polyol condensate, a cyclic urea/glyoxal/polyol condensate, a cyclic urea/glyoxal condensate, and mixtures thereof.Type: ApplicationFiled: August 27, 2002Publication date: January 9, 2003Applicant: Weyerhaeuser CompanyInventors: Richard A. Jewell, John A. Westland
-
Patent number: 6500947Abstract: The present invention provides a polymer derived from a cellulosic, lignocellulosic, or polysaccharide material having superabsorbent properties. Methods for making the polymer and personal care absorbent products that incorporated the polymer are also provided.Type: GrantFiled: August 24, 2001Date of Patent: December 31, 2002Assignee: Weyerhaeuser CompanyInventors: Hugh West, John A. Westland
-
Publication number: 20020031971Abstract: A crosslinkable cellulosic fibrous product that includes cellulosic fibers and a crosslinking agent is disclosed. The crosslinkable cellulosic fibrous product can be formed as a web or sheet that has structural integrity and sheet strength sufficient to permit the fibrous web to be rolled, transported, and used in rolled form in subsequent processes. The crosslinkable fibrous product can be converted into a crosslinked fibrous product by subjecting the product to conditions sufficient to effect intrafiber crosslinking. Alternatively, the web can be fiberized and the resulting individual crosslinkable fibers combined with other fibers and/or other materials to provide a fibrous web containing crosslinkable cellulosic fibers. Subjecting such a web to crosslinking conditions provides a fibrous web that includes, in addition to other fibers or materials, crosslinked cellulosic fibers.Type: ApplicationFiled: August 30, 2001Publication date: March 14, 2002Applicant: Weyerhaeuser CompanyInventors: John A. Westland, Colin Elston
-
Patent number: 6300259Abstract: A crosslinkable cellulosic fibrous product that includes cellulosic fibers and a crosslinking agent is disclosed. The crosslinkable cellulosic fibrous product can be formed as a web or sheet that has structural integrity and sheet strength sufficient to permit the fibrous web to be rolled, transported, and used in rolled form in subsequent processes. The crosslinkable fibrous product can be converted into a crosslinked fibrous product by subjecting the product to conditions sufficient to effect intrafiber crosslinking. Alternatively, the web can be fiberized and the resulting individual crosslinkable fibers combined with other fibers and/or other materials to provide a fibrous web containing crosslinkable cellulosic fibers. Subjecting such a web to crosslinking conditions provides a fibrous web that includes, in addition to other fibers or materials, crosslinked cellulosic fibers.Type: GrantFiled: April 26, 1999Date of Patent: October 9, 2001Assignee: Weyerhaeuser CompanyInventors: John A. Westland, Colin Elston
-
Patent number: 6207278Abstract: The present invention provides cellulosic fibers having high wet bulk and methods for their preparation. In one embodiment, the invention provides cellulosic fibers catalytically crosslinked with glyoxal and, optionally, a glycol. In another embodiment, cellulosic fibers are crosslinked with a combination of glyoxal and a glyoxal-derived resin selected from the group consisting of a glyoxal/polyol condensate, a cyclic urea/glyoxal/polyol condensate, a cyclic urea/glyoxal condensate, and mixtures thereof.Type: GrantFiled: January 29, 1999Date of Patent: March 27, 2001Assignee: Weyerhaeuser CompanyInventors: Richard A. Jewell, John A. Westland
-
Patent number: 6184271Abstract: Cellulosic fibers intrafiber crosslinked with a polymeric polycarboxylic acid crosslinking agent are disclosed. In one embodiment, the polymeric polycarboxylic acid is polyacrylic acid and, in another embodiment, the polycarboxylic acid is polymaleic acid. Methods for forming cellulosic fibers having stable intrafiber crosslinks and for forming crosslinked cellulosic fibers having low knot level are also disclosed.Type: GrantFiled: November 17, 1999Date of Patent: February 6, 2001Assignee: Weyerhaeuser CompanyInventors: John A. Westland, Richard A. Jewell, Amar N. Neogi
-
Patent number: 5998511Abstract: Cellulosic fibers intrafiber crosslinked with a polymeric polycarboxylic acid crosslinking agent are disclosed. In one embodiment, the polymeric polycarboxylic acid is polyacrylic acid and, in another embodiment, the polycarboxylic acid is polymaleic acid. Methods for forming cellulosic fibers having stable intrafiber crosslinks and for forming crosslinked cellulosic fibers having low knot level are also disclosed.Type: GrantFiled: December 12, 1997Date of Patent: December 7, 1999Assignee: Weyerhaeuser CompanyInventors: John A. Westland, Richard A. Jewell, Amar N. Neogi
-
Patent number: 5755828Abstract: Crosslinked cellulose fibers having free pendant carboxylic acid groups are disclosed. The fibers include a polycarboxylic acid covalently coupled to the fibers, and are crosslinked with a crosslinking agent having a cure temperature lower than the cure temperature of the polycarboxylic acid. Methods for producing the fibers and for producing a fibrous sheet incorporating the fibers are also disclosed.Type: GrantFiled: December 18, 1996Date of Patent: May 26, 1998Assignee: Weyerhaeuser CompanyInventor: John A. Westland
-
Patent number: 5362713Abstract: The addition of relatively small quantities of reticulated bacterial cellulose to well bore drilling muds improves their rheological properties. A preferred reticulated bacterial cellulose is one produced under agitated culture conditions using strains of a bacterium from the genus Acetobacter. Reticulated bacterial cellulose may be used in place of a conventional gellant or in combination with conventional gellants to provide improved drilling muds.Type: GrantFiled: March 26, 1992Date of Patent: November 8, 1994Assignee: Weyerhaeuser CompanyInventors: John A. Westland, Glenn S. Penny, Deborah A. Lenk
-
Patent number: 5350528Abstract: The addition of relatively small quantities of a bacterial cellulose to hydraulic fracturing fluids improves their rheological properties for hydraulic fracturing of geological formations. Proppant suspension is markedly improved and friction loss through well casings is significantly reduced, resulting in lower pumping energy requirements. Computer models also indicate that formation fractures will be propagated for greater distances as will the propped portion of the fracture. Normally only about 0.60-1.8 g of bacterial cellulose per liter of fracturing fluid is needed. A preferred bacterial cellulose is one made in agitated fermentors using mutation resistant strains of a bacterium from the genus Acetobacter.Type: GrantFiled: June 12, 1992Date of Patent: September 27, 1994Assignee: Weyerhaeuser CompanyInventors: John A. Westland, Glenn S. Penny, R. Scott Stephens, Alan R. Winslow
-
Patent number: 5228900Abstract: Particulate materials, particularly fine particles of clay animal litter, are agglomerated using a reticulated cellulose product formed by growing Acetobacter. Treatment with such reticulated cellulose also enhances the liquid absorbency of particulate materials.Type: GrantFiled: November 21, 1991Date of Patent: July 20, 1993Assignee: Weyerhaeuser CompanyInventors: R. Scott Stephens, John A. Westland, Douglas R. Shaw
-
Patent number: 5207826Abstract: A binding agent comprising fiber strands of microbially produced cellulose is disclosed. The cellulose is synthesized by certain strains of microorganisms of the genus Acetobacter grown under agitated culture conditions to produce fine, interconnected fiber strands forming a three-dimensional reticulated structure. The binding agent is effective for binding fibers and fragments of material, such as natural and treated wood fragments and particles as well as synthetic materials, and it imparts wet and dry tensile strength to the bound material.Type: GrantFiled: October 7, 1991Date of Patent: May 4, 1993Assignee: Weyerhaeuser CompanyInventors: John A. Westland, R. Scott Stephens, William C. Johnston, Jr., Harold J. Rosenkrans
-
Patent number: 4960763Abstract: The invention is a method of binding a portion of the cholesterol present in an aqueous suspension, such as the digestive system of a mammal. It involves the use of a purified bacterial cellulose in a sufficient amount to absorb or bind at least a portion of the cholesterol present in the system. The bacterial cellulose provides a dietary fiber component and is preferably one produced by a bacterium of the genus Acetobacter cultured under agitated aerobic conditions.Type: GrantFiled: April 18, 1988Date of Patent: October 2, 1990Assignee: Weyerhaeuser CompanyInventors: R. Scott Stephens, John A. Westland, Amar N. Neogi