Patents by Inventor Terje Angelskaar
Terje Angelskaar 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: 7947334Abstract: An alkali-free accelerator for sprayed cementitious composition, such as concrete, is prepared by dissolving aluminium sulphate in water and amorphous aluminium hydroxide in water optionally containing amine, and adding at least one stabiliser which is glycolic acid, and optionally at least one defoaming agent.Type: GrantFiled: November 7, 2002Date of Patent: May 24, 2011Assignee: Construction Research & Technology GmbHInventor: Terje Angelskaar
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Patent number: 7687443Abstract: A method of lubrication of the passage of a cementitious composition through a conduit, comprising the addition to the conduit prior to addition thereto of the cementitious composition of an aqueous solution of a solid lubricating composition consisting essentially of (i) an alkali metal carbonate or bicarbonate, (ii) poly(ethylene oxide), and (iii) anionic sulphate surfactant. The use of this composition allows the convenient achievement of flow, without the necessity to mix sometimes substantial quantities of cement slurry in situ.Type: GrantFiled: August 18, 2003Date of Patent: March 30, 2010Assignee: Construction Research & Technology GmbHInventor: Terje Angelskaar
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Patent number: 7662230Abstract: To provide a liquid accelerator which excels in accelerating effect and which also excels in storage stability at low temperature and inhibitory effect of alkali-aggregation reaction. A liquid accelerator composed of a fluoride-containing aqueous aluminum salt which is obtained through the reaction of aluminum sulfate and hydrofluoric acid, aluminum hydroxide, and one or more kinds of lithium salts selected from the group consisting of lithium hydroxides, lithium carbonates, and lithium sulfates.Type: GrantFiled: August 18, 2004Date of Patent: February 16, 2010Assignee: Construction Research & Technology GmbHInventors: Terje Angelskaar, Raita Iwata
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Patent number: 7381264Abstract: A liquid accelerator composition for sprayed concrete, comprising aluminium sulphate, amorphous aluminium hydroxide, alkanolamine and an organic dibasic acid anhydride. The compositions allow the attainment of high early compressive strength, and they can be tailored to give good performance with a wide variety of cement types.Type: GrantFiled: May 26, 2004Date of Patent: June 3, 2008Assignee: Construction Research & Technology GmbH.Inventor: Terje Angelskaar
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Patent number: 7198669Abstract: An accelerator composition for use with sprayed cementitious compositions, which is an aqueous solution or dispersion of a blend of the essential Components 1–3 Component 1—aluminium sulphate Component 2—at least one of an alkanolamine and an alkylene diamine or triamine Component 3—hydrofluoric acid optionally with at least one of Components 4–7, with the proviso that at least one of Component 4 or Component 5 be present: Component 4—at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, magnesium carbonate, sodium sulphate, potassium sulphate, magnesium sulphate and lithium sulphate; Component 5—C1–C10 aliphatic mono- and dicarboxylic acids and their metal salts; Component 6—aluminium hydroxide; Component 7—at least one of phosphoric acid and phosphorous acid. The accelerators have excellent long-term stability and work well with “difficult” cements, such as some Japanese OPCs.Type: GrantFiled: May 22, 2003Date of Patent: April 3, 2007Assignee: Construction Research & Technology GmbHInventors: Terje Angelskaar, Raita Iwata
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Publication number: 20070062417Abstract: A liquid accelerator composition for sprayed concrete, comprising aluminium sulphate, amorphous aluminium hy-droxide, alkanolamine and an organic dibasic acid anhydride. The compositions allow the attainment of high early compressive strength, and they can be tailored to give good performance with a wide variety of cement types.Type: ApplicationFiled: May 26, 2004Publication date: March 22, 2007Inventor: Terje Angelskaar
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Publication number: 20070044686Abstract: To provide a liquid accelerator which excels in accelerating effect and which also excels in storage stability at low temperature and inhibitory effect of alkali-aggregation reaction. A liquid accelerator composed of a fluoride-containing aqueous aluminum salt which is obtained through the reaction of aluminum sulfate and hydrofluoric acid, aluminum hydroxide, and one or more kinds of lithium salts selected from the group consisting of lithium hydroxides, lithium carbonates, and lithium sulfates.Type: ApplicationFiled: August 18, 2004Publication date: March 1, 2007Inventor: Terje Angelskaar
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Patent number: 7182808Abstract: An accelerator composition for use with sprayed cementitious compositions, which is an aqueous solution or dispersion of a blend of the essential Components 1–3 Component 1—aluminium sulphate Component 2—at least one of an alkanolamine and an alkylene diamine or triamine Component 3—hydrofluoric acid optionally with at least one of Components 4–7, with the proviso that at least one of Component 4 or Component 5 be present: Component 4—at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, magnesium carbonate, sodium sulphate, potassium sulphate, magnesium sulphate and lithium sulphate; Component 5—C1–C10 aliphatic mono- and dicarboxylic acids and their metal salts; Component 6—aluminium hydroxide; Component 7—at least one of phosphoric acid and phosphorous acid. The accelerators have excellent long-term stability and work well with “difficult” cements, such as some Japanese OPCs.Type: GrantFiled: February 19, 2004Date of Patent: February 27, 2007Assignee: Construction Research & Technology GmbHInventors: Terje Angelskaar, Raita Iwata
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Publication number: 20060210716Abstract: An alkali-free accelerator for sprayed cementitious composition, such as concrete, is prepared by dissolving aluminium sulphate in water and amorphous aluminium hydroxide in water optionally containing amine, and adding at least one stabiliser which is glycolic acid, and optionally at least one defoaming agent.Type: ApplicationFiled: November 7, 2002Publication date: September 21, 2006Inventor: Terje Angelskaar
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Publication number: 20060137576Abstract: An accelerator composition for use with sprayed cementitious compositions, which is an aqueous solution or dispersion of a blend of the essential Components 1-3 Component 1—aluminium sulphate Component 2—at least one of an alkanolamine and an alkylene diamine or triamine Component 3—hydrofluoric acid optionally with at least one of Components 4-7, with the proviso that at least one of Component 4 or Component 5 be present: Component 4—at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, magnesium carbonate, sodium sulphate, potassium sulphate, magnesium sulphate and lithium sulphate; Component 5—C1-C10 aliphatic mono- and dicarboxylic acids and their metal salts; Component 6—aluminium hydroxide; Component 7—at least one of phosphoric acid and phosphorous acid. The accelerators have excellent long-term stability and work well with “difficult” cements, such as some Japanese OPCs.Type: ApplicationFiled: February 19, 2004Publication date: June 29, 2006Inventors: Terje Angelskaar, Raita Iwata
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Patent number: 7037369Abstract: An alkali-free accelerator for use with spray-applied cementitious compositions such as concrete and mortar is the reaction product in aqueous medium of amorphous aluminium hydroxide, aluminium sulphate, formic acid and phosphoric acid. These accelerators perform as well as known alkali-free accelerators and are exceptionally stable, even in hot conditions.Type: GrantFiled: August 26, 2002Date of Patent: May 2, 2006Assignee: Construction Research & Technology GmbHInventor: Terje Angelskaar
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Publication number: 20060048685Abstract: An accelerator composition for use with sprayed cementitious compositions, which is an aqueous solution or dispersion of a blend of the essential Components 1-3 Component 1—aluminium sulphate Component 2—at least one of an alkanolamine and an alkylene diamine or triamine Component 3—hydrofluoric acid optionally with at least one of Components 4-7, with the proviso that at least one of Component 4 or Component 5 be present: Component 4—at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, magnesium carbonate, sodium sulphate, potassium sulphate, magnesium sulphate and lithium sulphate; Component 5—C1-C10 aliphatic mono- and dicarboxylic acids and their metal salts; Component 6—aluminium hydroxide; Component 7—at least one of phosphoric acid and phosphorous acid. The accelerators have excellent long-term stability and work well with “difficult” cements, such as some Japanese OPCs.Type: ApplicationFiled: May 22, 2003Publication date: March 9, 2006Inventors: Terje Angelskaar, Raita Iwata
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Publication number: 20060019837Abstract: A method of lubrication of the passage of a cementitious composition through a conduit, comprising the addition to the conduit prior to addition thereto of the cementitious composition of an aqueous solution of a solid lubricating composition consisting essentially of (i) an alkali metal carbonate or bicarbonate, (ii) poly(ethylene oxide), and (iii) anionic sulphate surfactant. The use of this composition allows the convenient achievement of flow, without the necessity to mix sometimes substantial quantities of cement slurry in situ.Type: ApplicationFiled: August 18, 2003Publication date: January 26, 2006Inventor: Terje Angelskaar
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Publication number: 20040255825Abstract: An alkali-free accelerator for use with spray-applied cementitious compositions such as concrete and mortar is the reaction product in aqueous medium of amorphous aluminium hydroxide, aluminium sulphate, formic acid and phosphoric acid. These accelerators perform as well as known alkali-free accelerators and are exceptionally stable, even in hot conditions.Type: ApplicationFiled: August 17, 2004Publication date: December 23, 2004Inventor: Terje Angelskaar