Starch, Dextran, Cellulose Ether Or Gum Patents (Class 106/730)
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Patent number: 7326290Abstract: The invention relates to a setting accelerator for a composition comprising Portland cement, in the form of a slurry comprising at least one calcium aluminate, 0.5 4%, preferably 0.6 2.3% of an aluminous cement setting inhibitor by weight in relation to the overall weight of the calcium alumnate, and an anti-sedimentation agent.Type: GrantFiled: December 24, 2003Date of Patent: February 5, 2008Assignee: KerneosInventors: Dominique Guinot, Eric Charpentier, Eric Frier
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Patent number: 7303625Abstract: Treatment fluid compositions, and more particularly, treatment fluid compositions that include chlorinated carbohydrates. An example is a treatment fluid that includes: a hydraulic cement; water; and a chlorinated carbohydrate. Another example of a treatment fluid is a cement composition including: a hydraulic cement; water; and an additive including a chlorinated carbohydrate and a tartaric acid.Type: GrantFiled: December 1, 2005Date of Patent: December 4, 2007Assignee: Halliburton Energy Services, Inc.Inventors: William J. Caveny, Rickey L. Morgan
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Patent number: 7288149Abstract: A fresh aqueous cement composition suitable for building purposes is described. It contains, besides a hydraulic cement, a methyl ethyl cellulose ether having a DS methyl of 0.4-2.2, a DS ethyl of 0.05-0.8 and a MS hydroxy-(C2-C3)-alkyl of 0-2. The celulose ether imparts excellent rheology properties, including a high water-retention combined with a long open time, to the cement composition. A dry blend and a rheology additive containing the cellulose ether are also described.Type: GrantFiled: November 26, 2002Date of Patent: October 30, 2007Assignee: Akzo Nobel N.V.Inventors: Hans Rydgren, Kjell Stridh
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Patent number: 7273100Abstract: Methods of cementing in a subterranean formation may include the steps of: providing a cement composition comprising a cement, water, and a dispersant comprising a low molecular weight starch that comprises anionic groups; placing the cement composition in the subterranean formation; and allowing the cement composition to set therein. In certain embodiments, improved biodegradable dispersants may include low molecular weight starches having anionic groups.Type: GrantFiled: April 15, 2003Date of Patent: September 25, 2007Assignee: Halliburton Energy Services, Inc.Inventors: B. Raghava Reddy, Larry S. Eoff
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Patent number: 7255731Abstract: The subject of the present invention is the use of particular polysaccharides as admixtures for mineral materials, especially as admixtures for mineral binders. These polysaccharides have, characteristically: a weight-average molecular weight Mw of at least 500 g/mol and at most 9000 g/mol, especially between 700 and 7000 g/mol; and a degree of branching DB of at least 10%, especially between 10 and 40%. The invention also relates to the combined use, in mineral materials, including especially mineral binders, of these particular polysaccharides on the one hand and of certain other admixtures on the other hand, for example admixtures, of saccharidic or nonsaccharidic type, having a plasticizing, superplasticizing or other functionality.Type: GrantFiled: June 2, 2005Date of Patent: August 14, 2007Assignee: Roquette FreresInventor: Léon Mentink
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Patent number: 7128782Abstract: A chromium VI reducing composition comprising particles of solid material selected from the group consisting of iron (II) sulfate and tin sulfate, the particles being substantially uniformly dispersed within a liquid carrier. Methods for modifying hydratable cementitious materials using the chromium reducing composition are also disclosed and provide advantages over dry powder or dissolved forms of sulfate compositions when used in cement manufacturing.Type: GrantFiled: July 13, 2004Date of Patent: October 31, 2006Assignee: W.R. Grace & Co.-Conn.Inventors: Leslie A. Jardine, Charles R. Cornman, David T. Geary, Vijay Gupta, Byong-Wa Chun
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Patent number: 7101426Abstract: An in situ ionic interaction between two additives, one a cationic strength enhancing additive and one an anionic crosslinking additive, is used to improve the mechanical properties of an article formed from a composite material. The composite has a discrete phase bound together with a film of the additives, such as gypsum crystals bound together by a film of substituted starch or cellulose ether.Type: GrantFiled: September 27, 2004Date of Patent: September 5, 2006Assignee: Innovative Construction and Building Materials, LLCInventors: Christopher D. Tagge, Jacob Freas Pollock, Ken Saito
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Patent number: 7095604Abstract: In an electric double-layer capacitor, a solution of a quaternary ammonium borofluoride compound in propylene carbonate is used as an electrolyte. The electrode includes alkali-activated carbon made using meso-phase pitch as a starting material, and a conductive filler having a rest potential smaller than that of the alkali-activated carbon in the electrolyte. The amount Fc of conductive filler incorporated in the electrode is set in a range of 10% by weight?Fc?40% by weight. Such electric double-layer capacitor has a large electrostatic capacity and excellent durability.Type: GrantFiled: August 27, 2004Date of Patent: August 22, 2006Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Minoru Noguchi, Manabu Iwaida, Naohiko Oki, Eisuke Komazawa, Takahiro Takeshita, Kenichi Murakami
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Patent number: 7067000Abstract: A method of cementing, comprising displacing a cement composition into a workspace, wherein the cement composition comprises cement, water, and a fluid loss control additive comprising a polymer and a sugar connected by a pH-sensitive crosslink, and allowing the cement composition to set. A method for reducing fluid loss from a cement composition, comprising providing a cement and a fluid loss control additive, wherein the fluid loss control additive comprises a polymer and a sugar connected by a pH-sensitive crosslink, and mixing the cement, fluid loss control additive, and water to form the cement composition.Type: GrantFiled: February 22, 2005Date of Patent: June 27, 2006Assignee: Halliburton Energy Services, Inc.Inventors: Michael J. Szymanski, Samuel J. Lewis, Michael J. R. Segura
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Patent number: 7041168Abstract: A method of preparing construction material systems is described. The process includes extruding a composition of construction materials and an irreversibly crosslinked cellulose derivative that is prepared by a particular process.Type: GrantFiled: August 9, 2004Date of Patent: May 9, 2006Assignee: Wolff Cellulosics GmbH & Co.,Inventors: Hartwig Schlesiger, Roland Bayer, Frank Höhl, Arne Henning Kull, Jürgen Engelhardt, Burkhard Kressdorf, Jörn-Bernd Pannek
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Patent number: 7008479Abstract: Methods of cementing in subterranean zones, improved cement compositions and improved additives are provided. The compositions are basically comprised of a hydraulic cement, sufficient water to form a slurry and an additive for providing improved rheology, fluid loss control and set retardation comprised of carboxymethylhydroxyethylcellulose having in the range of from about 0.62 to about 2.21 moles of hydroxyethyl substitution and in the range of from about 0.44 to about 0.52 degrees of carboxymethyl substitution and a 2% by weight aqueous solution of the carboxymethylhydroxyethylcellulose has a Höppler viscosity in the range of from about 55 mPa.s to about 359 mPa.s.Type: GrantFiled: May 5, 2004Date of Patent: March 7, 2006Assignee: Halliburton Energy Services, Inc.Inventors: Jiten Chatterji, Roger S. Cromwell, Darrell C. Brenneis, Bobby J. King
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Patent number: 7001939Abstract: Wheat starch of the present invention is obtained from endosperm of a seed of wheat which is modified to lack starch granule protein-1 (SGP-1). The wheat starch has an apparent amylose content of about 35% or more. Wheat flour of the present invention is obtained from endosperm of a seed of wheat which is modified to lack SGP-1. Wheat of the present invention is modified to lack SGP-1. The wheat flour and the wheat comprise wheat starch which has an apparent amylose content of about 35% or more.Type: GrantFiled: April 24, 2001Date of Patent: February 21, 2006Assignee: National Institute of Agrobiological SciencesInventor: Makoto Yamamori
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Patent number: 6933038Abstract: The present invention relates to a method for reinforcing mineral-based materials using reinforced fiber material. More particularly, the present invention relates a method for more uniformly dispensing a fiber material with a mineral-based material, such as cement paste.Type: GrantFiled: November 6, 2001Date of Patent: August 23, 2005Assignee: Institute of Paper Science and Technology, Inc.Inventors: Hiroki Nanko, Kimberly E. Kurtis
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Patent number: 6913644Abstract: The invention relates to concretes and mortars comprising a hydrophilic component such as hemp, flax or straw; a binder which sets in air through absorption of carbon dioxide after reduction in an aqueous phase; at least one additive which forms a microcapillary system array; and at least one matrix water repellency additive.Type: GrantFiled: June 19, 2002Date of Patent: July 5, 2005Assignee: BCBInventor: Michel Rizza
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Patent number: 6893497Abstract: The invention concerns the use of water-soluble polysaccharide derivatives as dispersing agents for mineral binder suspensions. A partially hydrolyzed cellulose containing carboxyl groups and optionally hydroxyalkyl and/or sulfate groups and/or a partially hydrolyzed amylose-rich starch which also has sulfoalkyl groups with 1 to 4 carbon atoms is used as the polysaccharide derivative. These polysaccharide derivatives have a low viscosity and an excellent plasticizing effect in mineral binder suspensions, especially in those based on cement, lime and/or gypsum.Type: GrantFiled: March 21, 2002Date of Patent: May 17, 2005Assignee: Degussa Construction Chemicals GmbHInventors: Lars Einfeldt, Gerhard Albrecht, Alfred Kern, Matilde Calado Vieira, Dieter Klemm
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Patent number: 6849117Abstract: A cement composition for liquid casting, based on a binder comprising Portland cement and additives comprising at least a fluidizer and a combination of a thickening agent acting by steric exclusion and a gelling thickening agent. The composition can also include a surface active agent to regulate the quantity of entrained air. Mixed with water and an aggregate, it permits obtaining, in a single casting, a self-leveling casting of a high thickness (equal to at least 6 cm) and of low density (about 1.6 to 1.9).Type: GrantFiled: October 15, 2001Date of Patent: February 1, 2005Assignee: Ciments FrancaisInventors: Pierre Colombet, Jean Ambroise, Jean-Pierre Grelaud, Michel Pasquier
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Patent number: 6846357Abstract: The present invention light weight high temperature well cement compositions and methods. The compositions are basically comprised of calcium aluminate, ASTM class F fly ash, sodium polyphosphate, a cationic derivatized starch fluid loss control additive and water.Type: GrantFiled: June 16, 2004Date of Patent: January 25, 2005Assignee: Halliburton Energy Services, Inc.Inventors: Baireddy R. Reddy, Lance E. Brothers, Anthony V. Palmer
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Publication number: 20040261665Abstract: The Discovery Channel did a documentary type show about “The Great Wall of China”. Researchers discovered that the stone in the wall had been deteriorating, but the mortar holding the stone together was not. They discovered that the mystery element in the mortar was Rice Flour.Type: ApplicationFiled: June 30, 2003Publication date: December 30, 2004Inventor: Alan S Williamson
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Publication number: 20040262001Abstract: The present invention relates to cementing operations, and more particularly, to cement compositions comprising set retarder compositions and methods of using the cement compositions in surface and subterranean applications. In some embodiments, the present invention provides cement compositions that comprise a hydraulic cement comprising an API cement, water, and a set retarder composition, the set retarder composition comprising an acrylamide polymer derivative; and an iron compound. In other embodiments, the present invention provides cement compositions, set retarder compositions, methods of cementing, methods of retarding the set time of a cement composition, and methods of preparing a cement composition.Type: ApplicationFiled: July 14, 2004Publication date: December 30, 2004Inventors: William J. Caveny, Rickey L. Morgan, Ronney R. Koch
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Patent number: 6824606Abstract: A water retaining additive for conglomerate building materials, free of cellulose-like derivatives, that comprises at least a rheological grade clay, preferably sepiolite, and a modified natural gum such as guar gum, as well as conglomerate compositions that contain the additive, as well as the use of the additive for different constructions materials comprised of gypsum and special mortars are described.Type: GrantFiled: December 19, 2000Date of Patent: November 30, 2004Assignee: Tolsa, S.A.Inventors: Antonio Alvarez Berenguer, Francisco Javier Limpo Orozco, Bernardo Enrique Del Valle Álvarez, Manuel Hidalgo Martín
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Patent number: 6814799Abstract: To a hydraulic composition for extrusion molding comprising a hydraulic substance, organic reinforcing fibers, and a thickening process aid, a defoamer containing a polyether component is added for preventing the composition from spring-back and imparting improved strength properties thereto.Type: GrantFiled: June 12, 2002Date of Patent: November 9, 2004Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Yoshiaki Sasage, Tsutomu Yamakawa
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Patent number: 6811605Abstract: An admixture comprising a nonionic water-soluble cellulose ether having a transparency of 35-89% in a 2 wt % aqueous solution at 20° C. is suited for hydraulic compositions. The hydraulic composition comprising the admixture and a less amount of pulp fibers is extrudable into a hardened part having a satisfactory flexural strength and surface smoothness.Type: GrantFiled: March 11, 2003Date of Patent: November 2, 2004Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Yoshiaki Sasage, Tsutomu Yamakawa
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Patent number: 6811604Abstract: The subject matter of the invention is a new additive for mineral binders comprising a composition containing at least one product of internal dehydration of a hydrogenated sugar which can especially be a dehydrated hexitol such as isosorbide, isomannide, sorbitan or mannitan and which can be introduced at a rate of between roughly 0.001 and 5% (dry/dry) within any mineral binder, said additive being advantageously used as an accelerator for setting and/or hardening and/or as an agent for improving the mechanical properties of the mineral binder. It has a remarkable efficiency, including at low temperatures.Type: GrantFiled: July 26, 2002Date of Patent: November 2, 2004Assignee: Roquette FreresInventors: Léon Mentink, Jean-Pierre Graux
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Publication number: 20040206502Abstract: Biodegradable dispersants for cement slurries, well cement compositions comprising such biodegradable dispersants, and methods of using such well cement compositions are provided. The biodegradable dispersants of the present invention comprise low molecular weight starches that comprise anionic groups.Type: ApplicationFiled: April 15, 2003Publication date: October 21, 2004Inventors: B. Raghava Reddy, Larry S. Eoff
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Patent number: 6800129Abstract: Exemplary liquid cement additive compositions have high solids loading which includes alkali or alkaline earth metal salts and other cement additive components. The liquid carrier is preferably aqueous in nature, although non-aqueous carriers are possible, and the carrier is modified using a viscosity modifying agent and dispersant to help load salt and other solids in high level amounts. Thus, methods for making the liquid cement additive compositions are also disclosed.Type: GrantFiled: January 30, 2003Date of Patent: October 5, 2004Assignee: W. R. Grace & Co.-Conn.Inventors: Leslie A. Jardine, David F. Myers, Anandakumar Ranganathan
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Publication number: 20040168802Abstract: Methods of cementing in subterranean formations, cement compositions, and methods for making the compositions are provided. A cement slurry is passed into a subterranean formation, and a swelling agent is passed into the subterranean formation to reduce an amount of water flowing into the cement slurry. The swelling agent may be combined with a carrier fluid before being displaced into the subterranean formation. Alternatively, the swelling agent may be pre-mixed with the cement slurry to form a new cement composition, followed by displacing the cement composition into the subterranean formation. The swelling agent is present in an amount effective to, upon absorption of water and swelling to form a gel mass, substantially block the flow path of the water into the cement composition or reduce losses to low pore pressure intervals, thereby preventing the integrity of the cement composition from being compromised or lost to voidage, fractures, fissures, etc.Type: ApplicationFiled: February 27, 2003Publication date: September 2, 2004Inventors: Prentice G. Creel, Charles L. Boatman, Richard H. Tate, Eldon Dwyann Dalrymple, Stephen P. Luscombe, John L. Eubank
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Publication number: 20040149172Abstract: Exemplary liquid cement additive compositions have high solids loading which includes alkali or alkaline earth metal salts and other cement additive components. The liquid carrier is preferably aqueous in nature, although nonaqueous carriers are possible, and the carrier is modified using a viscosity modifying agent and dispersant to help load salt and other solids in high level amounts. Thus, methods for making the liquid cement additive compositions are also disclosed.Type: ApplicationFiled: January 30, 2003Publication date: August 5, 2004Inventors: Leslie A. Jardine, David F. Myers, Anandakumar Ranganathan
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Patent number: 6755908Abstract: An admixture comprising a nonionic water-soluble cellulose ether having an average particle size of 120-500 &mgr;m is suited for hydraulic compositions. The admixture does not form clumps even in the presence of a large amount of water. The hydraulic composition having a proper amount of the admixture added is effectively extrudable.Type: GrantFiled: March 11, 2003Date of Patent: June 29, 2004Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Yoshiaki Sasage, Tsutomu Yamakawa
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Publication number: 20040103824Abstract: The invention concerns the use of water-soluble polysaccharide derivatives as dispersing agents for mineral binder suspensions. A partially hydrolyzed cellulose containing carboxyl groups and optionally hydroxyalkyl and/or sulfate groups and/or a partially hydrolyzed amylose-rich starch which also has sulfoalkyl groups with 1 to 4 carbon atoms is used as the polysaccharide derivative. These polysaccharide derivatives have a low viscosity and an excellent plasticizing effect in mineral binder suspensions, especially in those based on cement, lime and/or gypsum.Type: ApplicationFiled: September 19, 2003Publication date: June 3, 2004Inventors: Lars Einfeldt, Gerhard Albrecht, Alfred Kern, Matilde Calado Vieira, Dieter Klemm
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Publication number: 20040094069Abstract: Methods of cementing in subterranean zones, improved cement compositions and improved additives are provided. The compositions are basically comprised of a hydraulic cement, sufficient water to form a slurry and an additive for providing improved rheology, fluid loss control and set retardation comprised of carboxymethylhydroxyethylcellulose having in the range of from about 0.62 to about 2.21 moles of hydroxyethyl substitution and in the range of from about 0.44 to about 0.52 degrees of carboxymethyl substitution and a 2% by weight aqueous solution of the carboxymethylhydroxyethylcellulose has a Höppler viscosity in the range of from about 55 mPa.s to about 359 mPa.s.Type: ApplicationFiled: July 30, 2003Publication date: May 20, 2004Inventors: Jiten Chatterji, Rogers S. Cromwell, Darrell C. Brenneis, Bobby J. King
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Patent number: 6709508Abstract: Dry mortar formulations comprising a) from 0.5 to 80% by weight of hydraulic binder, b) from 0 to 97% by weight of fillers, c) from 0 to 3.5% by weight of thickeners, d) from 1.0 to 80% by weight of redispersible polymer powder, and e) from 0.0001 to 1.0% by weight of antioxidants exhibit improved tensile strength and other set mortar properties, particularly after storage of the dry mortar composition.Type: GrantFiled: May 14, 2002Date of Patent: March 23, 2004Assignee: Wacker Polymer Systems GmbH & Co. KGInventors: Ulf Dietrich, Theo Mayer
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Patent number: 6708760Abstract: Methods of cementing in subterranean zones, improved cement compositions and improved additives are provided. The compositions are basically comprised of a hydraulic cement, sufficient water to form a slurry and an additive for providing improved rheology, fluid loss control and set retardation comprised of carboxymethylhydroxyethylcellulose having in the range of from about 0.62 to about 2.21 moles of hydroxyethyl substitution and in the range of from about 0.44 to about 0.52 degrees of carboxymethyl substitution and a 2% by weight aqueous solution of the carboxymethylhydroxyethylcellulose has a Höppler viscosity in the range of from about 55 mPa.s to about 359 mPa.s.Type: GrantFiled: November 19, 2002Date of Patent: March 23, 2004Assignee: Halliburton Energy Services, Inc.Inventors: Jiten Chatterji, Roger S. Cromwell, Darrell C. Brenneis, Bobby J. King
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Patent number: 6706112Abstract: Disclosed are cementitious mortar additives comprising a hydroxyalkyl guar derivative having a molar substitution of from about 0.7 to about 3. Also disclosed are dry cementitious mortar compositions including from 0.1 to 1.5% by weight of the additive and cured cementitious mortars obtained by addition of water to the dry cementitious mortar compositions.Type: GrantFiled: June 3, 2002Date of Patent: March 16, 2004Assignee: Lamberti SpAInventors: Enrico Sironi, Giampietro Margheritis, Ugo Claudio Pfeiffer, Giuseppe Li Bassi
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Patent number: 6676745Abstract: This invention discloses a new technology related to cellulose fiber reinforced cement composite materials using cellulose fibers that are treated with inorganic and/or organic resins to make the fibers more hydrophobic, as well as other chemical treatments. This invention discloses four aspects of the technology: fiber treatment, formulations, methods and the final product. This technology advantageously provides fiber cement building materials with the desirable characteristics of reduced water absorption, reduced rate of water absorption, lower water migration, and lower water permeability. This invention also impart the final products improved freeze-thaw resistance, reduced efflorescence, and improved rot and UV resistances, compared to conventional fiber cement products. These improved attributes are gained without loss in dimensional stability, strength, strain or toughness. In some cases the physical and mechanical properties are improved.Type: GrantFiled: October 2, 2001Date of Patent: January 13, 2004Assignee: James Hardie Research Pty LimitedInventors: Donald J. Merkley, Caidian Luo
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Publication number: 20030234102Abstract: The present invention provides methods and compressible foamed sealing compositions for sealing expandable pipe in well bores. The compressible sealant compositions for sealing expandable pipe are basically comprised of a hydraulic cement, a rubber latex, a rubber latex stabilizer, a gas and a mixture of foaming and foam stabilizing surfactants.Type: ApplicationFiled: June 21, 2002Publication date: December 25, 2003Inventors: Lance E. Brothers, Anthony V. Palmer
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Publication number: 20030221592Abstract: Disclosed are cementitious mortar additives including at least a hydroxyalkyl guar derivative. Also dislcosed are dry cementitious mortar competitions including from 0.1 to 1.5% by weight of the additive and cured cementitious mortars obtained by addition of water to the dry cementitious mortar compositions.Type: ApplicationFiled: June 3, 2002Publication date: December 4, 2003Applicant: Lamberti SpAInventors: Enrico Sironi, Giampietro Margheritis, Ugo Claudio Pfeiffer, Giuseppe Li Bassi
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Patent number: 6648964Abstract: A novel admixture for mineral binders is composed of a polyol composition with a high hydrogenated disaccharide content (≧40%). The hydrogenated disaccharide is advantageously chosen from maltitol, lactitol and mixtures thereof. Within the admixture, the polyol composition (for example, maltitol powder, a maltitol syrup or a hydrogenated starch hydrolysate) may be combined with conventional admixtures for mineral binders, particularly lignosulfonates. The hydrogenated disaccharides make it possible to obtain an excellent compromise between retardation, plasticity and the mechanical properties of the mineral binder. They may be used equally well for admixing with cements and raw materials for cements as for admixing with mortars, slurries and concretes.Type: GrantFiled: May 3, 2001Date of Patent: November 18, 2003Assignee: Roquette FreresInventors: Leon Mentink, Jean-Pierre Graux, Clement Robert
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Publication number: 20030188667Abstract: The present invention relates to materials used for building products, construction projects, structural objects, mechanical devices and other materials applications. Specifically, the invention concerns composite materials made with reinforcing elements in a binder matrix material. A method of strengthening materials is described that uses high volumes of reinforcing elements, which can be easily dispersed and uniformly distributed, consisting of large diameter fibers, miniature rods or other similar geometric shapes with a diameter or thickness between 0.05 mm and 20 mm where the reinforcements are incorporated either as short, randomly distributed elements or long, continuous aligned arrays.Type: ApplicationFiled: April 2, 2003Publication date: October 9, 2003Inventors: Kirby Wayne Beard, Drew Franklin Beard
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Patent number: 6626992Abstract: Environmentally acceptable well cement fluid loss control additives, cement compositions including the additives and methods of using the compositions are provided. The environmentally acceptable fluid loss control additives are comprised of ethoxylated hydroxyethylcellulose having a reduced molecular weight.Type: GrantFiled: April 30, 2002Date of Patent: September 30, 2003Assignees: Halliburton Energy Services, Inc., Hercules IncorporatedInventors: Jan Pieter Vijn, Bach Dao, Mohand Melbouci
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Publication number: 20030177955Abstract: Storable water-microsphere suspensions for use in well cements and methods of cementing well bores are provided. The storable water-microsphere suspensions are basically comprised of water, microspheres and an effective amount of a suspending agent selected from the group consisting of microfine or colloidal materials and gel forming polymers.Type: ApplicationFiled: March 21, 2002Publication date: September 25, 2003Inventors: Jan Pieter Vijn, Bach Dao
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Publication number: 20030172849Abstract: A cementitious mix for preparing a building block wherein the mix includes the ingredients; sand, cement, sawdust and water; wherein said sawdust comprises the greater proportion of the mix constituents; and wherein the dry density of the mix ranges between 700 kg/m3 and 1500 kg/m3.Type: ApplicationFiled: April 2, 2003Publication date: September 18, 2003Inventor: Peter Collier
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Publication number: 20030167975Abstract: An admixture comprising a nonionic water-soluble cellulose ether having a transparency of 35-89 % in a 2 wt % aqueous solution at 20° C. is suited for hydraulic compositions. The hydraulic composition comprising the admixture and a less amount of pulp fibers is extrudable into a hardened part having a satisfactory flexural strength and surface smoothness.Type: ApplicationFiled: March 11, 2003Publication date: September 11, 2003Inventors: Yoshiaki Sasage, Tsutomu Yamakawa
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Publication number: 20030167976Abstract: An admixture comprising a nonionic water-soluble cellulose ether having an average particle size of 120-500 &mgr;m is suited for hydraulic compositions. The admixture does not form clumps even in the presence of a large amount of water. The hydraulic composition having a proper amount of the admixture added is effectively extrudable.Type: ApplicationFiled: March 11, 2003Publication date: September 11, 2003Inventors: Yoshiaki Sasage, Tsutomu Yamakawa
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Publication number: 20030167974Abstract: An admixture comprising (A) a nonionic water-soluble hydroxyethyl cellulose and/or hydroxyethyl ethyl cellulose having a viscosity of at least 500 mPa•s as measured in a 1 wt % aqueous solution at 20° C., and (B) another nonionic water-soluble cellulose ether having a viscosity of at least 1,500 mPa•s as measured in a 1 wt % aqueous solution at 20° C. is suited for use in extrudable hydraulic compositions, because the hydraulic compositions comprising the admixture are effectively extrudable into hardened products having improved surface properties, minimized spring-back and good dimensional accuracy.Type: ApplicationFiled: March 11, 2003Publication date: September 11, 2003Inventors: Yoshiaki Sasaga, Tsutomu Yamakawa
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Patent number: 6616754Abstract: The present invention relates to a segregation reducing agent consisting of curdlan and alkaline materials and a hydraulic composition containing the segragation reducing agent, particularly, the present invention relates to the segregation reducing agent prepared by alkalifying a curdlan-producing fermentation broth per se or a curdlan powder with an alkaline material, and also relates to hydraulic compositions, concrete and mortar, comprising the segregation educing agent. This segregation reducing agent can provide a great segregation reduction effect for hydraulic compositions even at its small amount as well as guarantee the strength, filling ability and fluidity.Type: GrantFiled: December 12, 2000Date of Patent: September 9, 2003Assignees: Korea Research Institute of Bioscience and Biotechnology, DMJ Biotech Corp.Inventors: Young-Hoon Park, In-Young Lee, Jung-Heon Lee, Mi-Kyoung Kim, Kyung-Hee Jung
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Publication number: 20030150362Abstract: An additive for elaboration of ecological permeable concretes. The additive containing from about 24.5% to 28.2% by weight.of a mixture made of dispersing agents, from about 3.3% to 3.8% by weight of a humectant agent, from 0 to about 1% by weight of a nonionic surfactant, from 0 to about 3% by weight basis of a bactericidal agent, from about 3.3% to 3.8% by weight of hydroxypropylethyl or methylcellulose from 0 to about 0.3% by weight of an antifoaming agent and from about 55.8% to 64.2% by weight of a highly reactive non-crystalline calcinated silica aluminant.Type: ApplicationFiled: March 11, 2003Publication date: August 14, 2003Inventors: Nestor De Buen-Unna, Luis German Guevara-Nieto, Jaime Grau-Genesias
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Patent number: 6592660Abstract: Methods and compositions for forming permeable cement sand screens in well bores are provided. The compositions are basically comprised of a hydraulic cement, a particulate cross-linked gel containing an internal breaker which after time causes the gel to break into a liquid and water present in an amount sufficient to form a slurry.Type: GrantFiled: February 19, 2002Date of Patent: July 15, 2003Assignee: Halliburton Energy Services, Inc.Inventors: Philip D. Nguyen, Ronald J. Crook, Johnny A. Barton, David L. Brown
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Patent number: 6547873Abstract: A concentrated one-coat mortar prepared for the application on a concrete based surface on the exterior or interior of a concrete building or other structure. The mortar is especially suited for application in high and low humidity and high and low temperature environments. As the mortar dries, its composition prevents the formation of cracks that commonly occur in commercially available mortars.Type: GrantFiled: May 23, 2002Date of Patent: April 15, 2003Inventor: Eduardo Ramirez de Arellano
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Publication number: 20030061970Abstract: An additive for elaboration of ecological permeable concretes. The additive containing from about 24.5% to 28.2% by weight of a mixture made of dispersing agents, from about 3.3% to 3.8% by weight of a humectant agent, from 0 to about 1% by weight of a non ionic surfactant, from 0 to about 3% by weight basis of a bactericidal agent, from about 3.3% to 3.8% by weight of hydroxypropylethyl or methylcellulose from 0 to about 0.3% by weight of an antifoaming agent and from about 55.8% to 64.2% by weight of a highly reactive non-crystalline calcinated silica aluminant.Type: ApplicationFiled: July 10, 2001Publication date: April 3, 2003Inventors: Nestor De Buen-Unna, Luis German Guevara-Nieto, Jaime Grau-Genesias
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Patent number: 6500253Abstract: Methods of agglomerating hydraulic cement powder to improve its flow and handling characteristics are provided. One embodiment of the methods of the present invention is comprised of the steps of forming a mixture of the hydraulic cement powder with a particulate solid disintegrating agent, the disintegrating agent having the property of causing the break up of the agglomerated cement powder upon contact with water. Thereafter, the mixture is compressed into agglomerated pellets.Type: GrantFiled: December 18, 2000Date of Patent: December 31, 2002Assignee: Halliburton Energy Services, Inc.Inventors: Lewis R. Norman, Richard Turton, Huma Hakim