Patents by Inventor Bruce J. Christensen
Bruce J. Christensen 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).
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Patent number: 8361220Abstract: A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant, a set retarder, and a strength improvement additive.Type: GrantFiled: July 31, 2012Date of Patent: January 29, 2013Assignee: Construction Research & Technology GmbHInventors: Jeffrey R. Bury, Thomas M. Vickers, Jr., Bruce J. Christensen
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Publication number: 20120298013Abstract: A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant, a set retarder, and a strength improvement additive.Type: ApplicationFiled: July 31, 2012Publication date: November 29, 2012Inventors: Jeffrey R. Bury, Thomas M. VICKERS, JR., Bruce J. CHRISTENSEN
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Patent number: 8258210Abstract: A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant, a set retarder, and a strength improvement additive.Type: GrantFiled: February 26, 2004Date of Patent: September 4, 2012Assignee: Construction Research & Technology GmbHInventors: Jeffrey R. Bury, Thomas M. Vickers, Jr., Bruce J. Christensen
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Patent number: 7972435Abstract: A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant and strength improvement additive.Type: GrantFiled: June 2, 2009Date of Patent: July 5, 2011Assignee: Construction Research & Technology GmbHInventors: Jeffrey R Bury, Thomas M Vickers, Jr., Bruce J Christensen
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Patent number: 7922808Abstract: An improved freeze-thaw durability dry cast cementitious composition is provided that uses very small (0.1 ?m to 100 ?m average diameter) polymeric microspheres that are blended directly into the mixture and optionally gas-generating additives. The polymeric microspheres provide void spaces in the material matrix that act to increase freeze-thaw durability of the material. In this dry cast cementitious composition, polymeric microspheres act as pre-formed voids.Type: GrantFiled: June 14, 2005Date of Patent: April 12, 2011Assignee: Construction Research & Technology GmbHInventors: Lynn E. Brower, Thomas M. Vickers, Jr., Patrick Miller, Bruce J. Christensen
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Patent number: 7648575Abstract: An improved freeze-thaw durability cementitious composition is provided that uses at least partially degradable polymeric particles that are blended directly into the cementitious composition mixture. The degradable polymeric particles provide void spaces in the cementitious material matrix, and such void spaces act to increase freeze-thaw durability of the cementitious material.Type: GrantFiled: January 16, 2009Date of Patent: January 19, 2010Assignee: Construction Research & Technology GmbHInventors: Michael L. Kerns, Bruce J. Christensen
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Publication number: 20090292041Abstract: A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant and strength improvement additive.Type: ApplicationFiled: June 2, 2009Publication date: November 26, 2009Applicant: Construction Research & Technology GmbHInventors: Jeffrey R. BURY, Thomas M. Vickers, JR., Bruce J. Christensen
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Patent number: 7556684Abstract: A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant and strength improvement additive.Type: GrantFiled: February 25, 2005Date of Patent: July 7, 2009Assignee: Construction Research & Technology GmbHInventors: Jeffrey R. Bury, Thomas M. Vickers, Jr., Bruce J. Christensen
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Publication number: 20090124728Abstract: An improved freeze-thaw durability cementitious composition is provided that uses at least partially degradable polymeric particles that are blended directly into the cementitious composition mixture. The degradable polymeric particles provide void spaces in the cementitious material matrix, and such void spaces act to increase freeze-thaw durability of the cementitious material.Type: ApplicationFiled: January 16, 2009Publication date: May 14, 2009Applicant: Construction Research & Technology GmbHInventors: Michael L. Kerns, Bruce J. Christensen
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Patent number: 7531584Abstract: An improved freeze-thaw durability cementitious composition is provided that uses at least partially degradable polymeric particles that are blended directly into the cementitious composition mixture. The degradable polymeric particles provide void spaces in the cementitious material matrix, and such void spaces act to increase freeze-thaw durability of the cementitious material.Type: GrantFiled: June 13, 2006Date of Patent: May 12, 2009Assignee: Construction Research & Technology GmbHInventors: Michael L. Kerns, Bruce J. Christensen
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Patent number: 7288147Abstract: An improved freeze-thaw durability wet cast cementitious composition is provided that uses in-situ production of gas by gas generating additives and optionally polymeric microspheres that are blended directly into the mixture. The gas generating additives and the polymeric microspheres provide void spaces in the material matrix, and such void spaces act to increase freeze-thaw durability of the material.Type: GrantFiled: June 14, 2005Date of Patent: October 30, 2007Assignee: Construction Research&Technology GmbHInventors: Bruce J. Christensen, Thomas M. Vickers, Jr.
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Publication number: 20040198873Abstract: A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant, a set retarder, and a strength improvement additive.Type: ApplicationFiled: February 26, 2004Publication date: October 7, 2004Applicant: Construction Research and Technology GmbHInventors: Jeffrey R. Bury, Thomas M. Vickers, Bruce J. Christensen
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Publication number: 20040149174Abstract: A cold-weather admixture composition that accelerates the setting time and strength development of cementitious compositions is provided which comprises the components of a soluble inorganic salt having freezing point depressing properties, an inorganic early set and strength accelerator, a polycarboxylate high range water reducing dispersant, and an organic set accelerator. With lower dosages of dispersant than those disclosed in the prior art the admixture composition provides to concrete increased dispersant performance and acceleration of setting time and strength development.Type: ApplicationFiled: February 5, 2003Publication date: August 5, 2004Applicant: MBT Holding AGInventors: Stephen A. Farrington, Bruce J. Christensen
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Patent number: 6200404Abstract: Compositions and methods for manufacturing sheets having a starch-bound matrix reinforced with fibers and optionally including an inorganic mineral filler. Suitable mixtures for forming the sheets are prepared by mixing together water, unmodified and ungelatinized starch granules, an auxiliary water-dispersible organic polymer, fibers, and optionally an inorganic mineral filler in the correct proportions to form a sheet having desired properties. The mixtures are formed into sheets by passing them between one or more sets of heated rollers to form green sheets. The heated rollers cause the auxiliary polymer to form a skin on the outer surfaces of the sheet that prevents the starch granules from causing the sheet to adhere to the rollers upon gelation of the starch. The green sheets are passed between heated rollers to gelatinize the starch granules, and then to dry the sheet by removing a substantial portion of the water by evaporation.Type: GrantFiled: November 24, 1998Date of Patent: March 13, 2001Assignee: E. Khashoggi Industries, LLCInventors: Per Just Andersen, Shaode Ong, Bruce J. Christensen, Simon K. Hodson
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Patent number: 6168857Abstract: Compositions and methods for manufacturing sheets having a starch-bound matrix reinforced with fibers and optionally including an inorganic mineral filler. Suitable mixtures for forming the sheets are prepared by mixing together water, unmodified and ungelatinized starch granules, an auxiliary water-dispersible organic polymer, fibers, and optionally an inorganic mineral filler in the correct proportions to form a sheet having desired properties. The mixtures are formed into sheets by passing them between one or more sets of heated rollers to form green sheets. The heated rollers cause the auxiliary polymer to form a skin on the outer surfaces of the sheet that prevents the starch granules from causing the sheet to adhere to the rollers upon gelation of the starch. The green sheets are passed between heated rollers to gelatinize the starch granules, and then to dry the sheet by removing a substantial portion of the water by evaporation.Type: GrantFiled: October 30, 1998Date of Patent: January 2, 2001Assignee: E. Khashoggi Industries, LLCInventors: Per Just Andersen, Shaode Ong, Bruce J. Christensen, Simon K. Hodson
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Patent number: 6083586Abstract: Compositions and methods for manufacturing sheets having a starch-bound matrix, optionally reinforced with fibers and optionally including an inorganic mineral filler. Suitable mixtures for forming the sheets are prepared by mixing together water, unmodified and ungelatinized starch granules, a cellulosic ether, optionally fibers, and optionally an inorganic mineral filler in the correct proportions to form a sheet having desired properties. The mixtures are formed into sheets by passing them between one or more sets of heated rollers to form green sheets. The heated rollers cause the cellulosic ether to form a skin on the outer surfaces of the sheet that prevents the starch granules from causing the sheet to adhere to the rollers upon gelation of the starch. The green sheets are passed between heated rollers to gelatinize the starch granules, and then to dry the sheet by removing a substantial portion of the water by evaporation.Type: GrantFiled: February 6, 1998Date of Patent: July 4, 2000Assignee: E. Khashoggi Industries, LLCInventors: Per Just Andersen, Shaode Ong, Bruce J. Christensen, Simon K. Hodson
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Patent number: 5736209Abstract: Compositions and methods for manufacturing sheets having a starch-bound matrix reinforced with fibers and optionally including an inorganic mineral filler. Suitable mixtures for forming the sheets are prepared by mixing together water, unmodified and ungelatinized starch granules, a cellulosic ether, fibers, and optionally an inorganic mineral filler in the correct proportions to form a sheet having desired properties. The mixtures are formed into sheets by passing them between one or more sets of heated rollers to form green sheets. The heated rollers cause the cellulosic ether to form a skin on the outer surfaces of the sheet that prevents the starch granules from causing the sheet to adhere to the rollers upon gelation of the starch. The green sheets are passed between heated rollers to gelatinize the starch granules, and then to dry the sheet by removing a substantial portion of the water by evaporation.Type: GrantFiled: April 9, 1996Date of Patent: April 7, 1998Assignee: E. Kashoggi, Industries, LLCInventors: Per Just Andersen, Shaode Ong, Bruce J. Christensen, Simon K. Hodson