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| Number | Title | Issue Date |
| 8187376 | Defoamers for hydratable cementitious compositions The present invention discloses additive compositions, cementitious compositions, and methods for controlling air in cementitious compositions, wherein a polyalkoxylated polyalkylene polyamine defoamer is deployed in combination with one or more air-entraining agent... | 05/29/2012 |
| 7422061 | Fluid loss additives and methods Nonionic derivatized starch of varying degrees of substitution may be used as a fluid loss additive for well bore cementing operations. A well bore cementing composition may include a cement and a nonionic derivatized starch, the nonionic derivatized starch in a con... | 09/09/2008 |
| 7410536 | Oxidation-stable iron oxide pigments, process for preparing them and their use The present invention relates to oxidation-stable iron oxide pigments which have a coating of at least one organic substance, to their preparation and to their use. ... | 08/12/2008 |
| 7381264 | Admixture 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 tailore... | 06/03/2008 |
| 7350574 | Methods of retarding the setting of a cement composition using biodegradable monomers Methods of retarding the setting of a cement composition comprise including one or more secondary amines substituted with a carboxyl group or salts thereof (e.g., 3-hydroxy N,N′-iminodisuccinic acid) in the cement composition. The inclusion of such materials in ce... | 04/01/2008 |
| 7328756 | Settable fluids comprising particle-size distribution-adjusting agents and methods of use Settable fluids comprising particle-size distribution-adjusting agents, and methods of using such settable fluids in subterranean and surface applications are provided. In certain exemplary embodiments, the settable fluid comprises a cement, a set retarder, and a pa... | 02/12/2008 |
| 7288147 | Providing freezing and thawing resistance to cementitious compositions 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 po... | 10/30/2007 |
| 7285165 | Cement compositions comprising set retarder compositions and associated methods Cement compositions are provided that comprise a hydraulic cement, water, and a set retarder composition, the set retarder composition comprising an acrylamide polymer derivative; and an iron compound. In some embodiments, cement compositions are provided that compr... | 10/23/2007 |
| 7270183 | Cementing methods using compressible cement compositions A method of cementing at least two casing strings in a well bore, the method having steps as follows: filling the well bore and the inner diameters of the at least two casing strings with a cement composition, wherein at least a portion of the cement composition is ... | 09/18/2007 |
| 7247201 | Pre-blend cement compositions containing non-chloride accelerators The present invention relates to pre-blend cement for general-purpose concrete construction containing Class-F fly ash, Class-C fly ash or slag, and less than about 5 percent (w/w) of sodium thiocyanate (NaSCN) and/or calcium nitrate (Ca(NO3)2)... | 07/24/2007 |
| 7232873 | Polycarboxylic acid cement dispersant and method for producing concrete secondary product A polycarboxylic acid cement dispersant that can exhibit high dispersing ability and allow deforming in early stages in the case of producing concrete products, whereby the turnover of a formwork is increased so as to improve productivity, and the method of producin... | 06/19/2007 |
| 7223443 | Antimicrobial cementitious composition An antimicrobial cementitious composition for imparting antimicrobial characteristics to cement comprises cement and an antimicrobial agent selected from the group consisting of an ortho-phenyl phenol or salt thereof, a tolyl diiodomethyl sulfone, a zinc pyrithione,... | 05/29/2007 |
| 7219479 | Avoiding cracking and curling in concrete flooring upon which water-based adhesives are employed The invention provides a method for making a concrete floor slab using sub-grade waterproofing in a manner that favors the use of water-based adhesives for affixing floor covering materials. The method comprises casting a hydratable cementitious composition onto a f... | 05/22/2007 |
| 7198669 | Accelerator admixture 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 alkanolamin... | 04/03/2007 |
| 7191834 | Foamed cement compositions and associated methods of use A method of cementing in a subterranean formation that comprises providing a foamed cement composition that comprises water, a cement, a gas, and an additive, the additive comprising an anionic foaming agent and at least one of an anionic foam stabilizer or a Zwitte... | 03/20/2007 |
| 7182808 | Accelerator admixture 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 alkanolamin... | 02/27/2007 |
| 7166160 | Biodegradable cement retarder compositions and methods of cementing in a subterranean formation The present invention is directed to hydraulic cement compositions comprising set-retarding additives and methods of retarding the set of a cement composition utilizing poly(amide) set-retarding additives and methods of cementing in subterranean zones utilizing a ce... | 01/23/2007 |
| 7160384 | Amine-containing cement processing additives An exemplary method of the invention comprises introducing into a grinding mill, wherein cement clinker is ground to provide cement powder, a diamine such as tetrahydroxylethylethylene diamine, and an alkanolamine such as triethanolamine or triisopropanolamine. The ... | 01/09/2007 |
| 7128782 | Sulfate dispersion chromate reducer 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 cementi... | 10/31/2006 |
| 7114569 | Methods, cement compositions and suspending agents therefor The present invention includes methods of cementing, cement compositions and a suspending agent comprising boron treated low molecular weight dry ground guar splits. A cement composition of the invention comprises hydraulic cement, water and a boron treated low mole... | 10/03/2006 |
| 7073585 | Cement compositions with improved fluid loss characteristics and methods of cementing in surface and subterranean applications Cement compositions comprising an improved fluid loss control additive, and methods for cementing using such cement compositions, are provided herein. Exemplary embodiments of the cement compositions comprise a hydraulic cement, water, and a fluid loss control addit... | 07/11/2006 |
| 7063153 | Methods and compositions for cementing wells Methods of cementing subterranean zones penetrated by well bores and well cement compositions. A well cement composition of the invention basically comprises a hydraulic cement, water in an amount sufficient to form a pumpable slurry and a fluid loss control polymer... | 06/20/2006 |
| 7059408 | Methods of reducing the impact of a formate-based drilling fluid comprising an alkaline buffering agent on a cement slurry A cement slurry comprising a base for reducing the impact of an alkaline solution may be displaced into a wellbore and allowed to set. The base may comprise a metal carbonate that is soluble in water such as potassium carbonate. The cement slurry may further include... | 06/13/2006 |
| 7053125 | Controlled dispersion of colloidal suspension by comb polymers Comb polymers are used as dispersants to increase the stability of colloidal suspensions containing multivalent or high concentrations of monovalent ions. Stabilized colloidal suspensions and methods of forming stabilized colloidal suspensions are described, includi... | 05/30/2006 |
| 7037369 | Accelerator composition 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... | 05/02/2006 |
| 7022755 | Resilient cement compositions and methods of cementing Resilient cement compositions and methods of cementing using the compositions are disclosed. A resilient cement composition of the invention comprises hydraulic cement, an aqueous rubber latex and a rubber latex stabilizing surfactant comprising an iso-dodecyl alcoh... | 04/04/2006 |
| 7021380 | Compositions comprising set retarder compositions and associated methods Cement compositions comprising set retarder compositions, and methods of using the cement compositions in surface and subterranean applications are provided. In some embodiments, cement compositions are provided that comprise a hydraulic cement comprising an API cem... | 04/04/2006 |
| 7008477 | Foamed cement slurries, additives and methods The present invention relates to foamed cement slurries, additives and methods. A foamed cement slurry of the invention comprises a hydraulic cement, sufficient water to form a slurry, sufficient gas to form a foam and an environmentally benign foaming and stabilizi... | 03/07/2006 |
| 7004256 | Set retarder compositions, cement compositions, and associated methods Cement compositions, that comprise water, a cement, a strength-retrogression additive, and an acid, wherein the acid comprises ethylenediamine tetra acetic acid, nitrilotriacetic acid, or a combination thereof, are provided. Methods of cementing in a subterranean fo... | 02/28/2006 |
| 6978835 | Methods of cementing in subterranean formations A method of retarding the set time of a cement composition comprising providing a cement composition that comprises water and a cement, and retarding the set time of the cement composition by including a copolymer retarder in the cement composition, wherein the copo... | 12/27/2005 |
| 6969423 | Lightweight strain hardening brittle matrix composites Fiber reinforced lightweight concrete composites employ less than 4% by volume of reinforcing fibers in conjunction with small particulate lightweight aggregates or voids, and cure to composites which exhibit high tensile strain and strain hardening behavior. The co... | 11/29/2005 |
| 6960253 | Method of forming hydraulic cement protective coatings Dry mixes for hydraulic cement coatings for masonry, above ground concrete structures and below ground concrete structures. Hydraulic cement, sand and particular aggregates are combined to form the dry mix, which is combined with a controlled quantity of a water bas... | 11/01/2005 |
| 6955220 | Process of well cementing in cold environment The present invention provides improved well cementing methods for use in cold environment, where the circulating temperature of the cement is typically within the range of 5 to 20° C. The improved well cementing methods include forming compositions that are essent... | 10/18/2005 |
| 6953090 | Cementing subterranean zones using cement compositions containing biodegradable dispersants Methods of cementing subterranean zones using cement compositions containing biogradable dispersants are provided. The methods are basically comprised of the steps of preparing a hydraulic cement, a biodegradable dispersant comprised of polyaspartic acid containing ... | 10/11/2005 |
| 6951249 | Foamed cement slurries, additives and methods The present invention relates to foamed cement slurries, additives and methods. A foamed cement slurry of the invention comprises a hydraulic cement, sufficient water to form a slurry, sufficient gas to form a foam and an environmentally benign foaming and stabilizi... | 10/04/2005 |
| 6916369 | Beneficiated water reducing compositions Exemplary compositions comprise at least one aldopentonic acid, such as xylonic acid; and further comprise a lignin, a lignosulfonic acid or its salt, an additional sugar acid such as a aldohexonic acid or salt, a conventional admixture (such as a polyacrylate super... | 07/12/2005 |
| 6899177 | Methods of cementing subterranean zones with cement compositions having enhanced compressive strengths Methods of cementing subterranean zones penetrated by well bores using cement compositions having enhanced compressive strengths are provided. A method of the invention basically comprises the steps of preparing or providing a cement composition having enhanced comp... | 05/31/2005 |
| 6872247 | Amine-based, hexavalent chromium reducing agents for cement Methods and compositions involving hexavalent chromate-reducing agents, particularly hydroxylamine, hydrazine, or their salts or derivatives, for use in cement compositions and cement processing. ... | 03/29/2005 |
| 6858661 | Defoamer for water reducer admixture An exemplary admixture system for cementitious compositions, comprises a polycarboxylic acid type water reducer and a tertiary amine defoamer having an average molecular weight of 100-1500 and more preferably 200-750. The defoamer permits a stable admixture formulat... | 02/22/2005 |
| 6855201 | Cementing compositions A cement composition is basically comprised of a hydraulic cement, water in an amount sufficient to form a pumpable slurry and a fluid loss control polymer additive comprised of 69 weight % of the calcium salt of 2-acrylamido-2-methyl propane sulfonic acid, 14 weigh... | 02/15/2005 |
