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| Number | Title | Issue Date |
| 8021476 | Gypsum mortar with added expanded vermiculite and method for obtaining same The invention relates to gypsum mortar with expanded vermiculite added with citric acid and tartaric acid and to the method for obtaining same, containing the following elements in the following proportions: between 40% and 70% calcium sulphate; between 40% and 70% ... | 09/20/2011 |
| 7678189 | Foaming plaster A method of producing a foamed plaster comprises the following steps: (a) mixing plaster of Paris and calcium carbonate; (b) supplying water, and (c) adding phosphoric acid. The phosphoric acid reacts with the calcium carbonate to release gaseous carbon dioxide. It ... | 03/16/2010 |
| 7441600 | Cement compositions with improved mechanical properties and methods of cementing in subterranean formations The present invention provides foamed cement compositions with improved mechanical properties and methods of cementing in subterranean formations, particularly in conjunction with subterranean well operations. The foamed cement compositions comprise carbon fibers, a... | 10/28/2008 |
| 7431763 | Magnesium ammonium phosphate cement composition This invention relates to a cement, which comprises in its main phase of microcrystalline magnesium ammonium phosphate and nanoapatite after hardening and thus at the same time has considerable strength. The material is biologically degradable and is suitable for ap... | 10/07/2008 |
| 7303015 | Cementitious compositions containing interground cement clinker and zeolite Methods and compositions for wellbore treating fluids, especially cementitious compositions that include interground cement clinker and zeolite, with and without gypsum. ... | 12/04/2007 |
| 7244304 | Gypsum-containing board and tile, and method for producing same A method for producing a set gypsum-containing product comprising an interlocking matrix of set gypsum wherein said method comprises applying to said set gypsum one or more enhancing materials selected from the group consisting of phosphoric acid; condensed phosphor... | 07/17/2007 |
| 7220373 | Process for lightening plasterboards Process for the manufacture of plasterboards exhibiting a core density of less than 0.77 comprising the stages of the formation of a foam from water and a surfactant composed of at least one alkyl sulphate of formula H(CH2)nOSO3... | 05/22/2007 |
| 7071256 | Polymer composition A polymer composition which comprises a continuous phase comprising a water immiscible liquid and a dispersed phase comprising a polymer of an N-substituted acrylamide and ethylenically unsaturated acid or salt and optionally a cross-linking agent. The polymer compo... | 07/04/2006 |
| 7033431 | Surfactant composition for gypsum plaster boards A gypsum composition including gypsum, water, and a surfactant composition of alkyl sulfates of formula H(CH2)nOSO3−M+, in which n is from 6 to 16, the mean number of carbon atoms in the alkyl sulfate composit... | 04/25/2006 |
| 6893752 | Mold-resistant gypsum panel and method of making same A mold-resistant gypsum panel includes a core of an interlocking matrix of calcium sulfate dihydrate crystals, a facing material on at least one side of the panel and a salt of pyrithione dispersed through both the core and the facing materials. A method of making a... | 05/17/2005 |
| 6806298 | Sprayable composition and method for forming a foamed outdoor protective cover layer A sprayable composition and a method of protecting material with the composition is disclosed. The composition comprises a bulking/setting material, a water soluble polymer and water to provide a cover layer which, after spraying, is tough, flexible and water-repell... | 10/19/2004 |
| 6773500 | Fiber reinforced aerated concrete and methods of making same Fiber reinforced aerated concrete compositions and methods of forming structural units such as blocks, panels, etc., from such compositions are disclosed. The compositions comprise a fly ash/cement slurry with a coated Al paste serving as the activator to generate t... | 08/10/2004 |
| 6774146 | Dispersant and foaming agent combination The present invention provides a dispersant and foaming agent combination that is useful in the production of gypsum wallboard and other aqueous cementitious products. The dispersant in the combination according to the invention is a naphthalene sulfonate-aldehyde c... | 08/10/2004 |
| 6706128 | Method of providing void space in gypsum wallboard and in a gypsum core composition The invention provides a method of providing void spaces in gypsum wallboard and in a gypsum core composition such that the weight of the gypsum product is reduced without deleteriously affecting its mechanical properties. More specifically, the invention provides a... | 03/16/2004 |
| 6692615 | Method of making a slurry An organic substrate is manufactured from recycled waste paper, cotton fiber and cotton gin waste, and gypsum. The recycled waste products are combined to form a slurry mixture for processing by conventional paper making machinery into a substrate that ma... | 02/17/2004 |
| 6626991 | Low-density and low-porosity cementing slurry for oil wells or the like The invention relates to a cement slurry for cementing an oil well or the like, the slurry having a density lying in the range 0.9 g/cm3 to 1.3 g/cm3, and being constituted by a solid fraction and a liquid fraction, having porosity (... | 09/30/2003 |
| 6569541 | Plaster-based prefabricated structural element exhibiting water resistance A water-resistant prefabricated structural element comprising a substrate based on cured plaster, said substrate being able to be obtained by at least the following steps: (a) homogeneously mixing a dry material, comprising mostly at least one hydratable ... | 05/27/2003 |
| 6511537 | Retarding systems and application to oil well cementing Systems for retarding setting in an oilfield well cement slurry comprise a solution of a phosphonate selected from methylene phosphonic acid derivatives and a phosphate, in particular selected from the following salts or the corresponding acids: mono-phos... | 01/28/2003 |
| 6406755 | Sprayable fireproofing composition Improved sprayable gypsum-based fireproofing composition comprising a lightweight aggregate and a set retarding agent in an amount effective to delay the setting of said composition for at least 24 hours and preferably for at least 72-96 hours without cau... | 06/18/2002 |
| 6387172 | Gypsum compositions and related methods A set gypsum composition and methods for the preparation thereof are disclosed. The set gypsum composition comprises a continuous phase of interlocking set gypsum matrix having an enhanced water voids volume and/or is prepared from a mixture (e.g., slurry... | 05/14/2002 |
| 6376558 | Method of producing a porous paste, especially a porous plaster slurry, and a mixer for preparing such paste or slurry A porous paste, especially a plaster paste or slurry for producing sandwich-type plasterboard, is made in a disk-shaped mixer having a rotor rotatable in a mixing chamber by introducing compressed air or other pressurizable gas through a wall or bottom se... | 04/23/2002 |
| 6340388 | Strengthened, light weight wallboard and method and apparatus for making the same A novel wallboard composition is disclosed comprising a unique combination of synthetic binders selected for their ability to establish a strengthened permanent bond in the final dry state for use in a wallboard composition comprising primarily gypsum, an... | 01/22/2002 |
| 6319312 | Strengthened, light weight wallboard and method and apparatus for making the same A novel wallboard composition is disclosed comprising a unique combination of synthetic binders selected for their ability to establish a strengthened permanent bond in the final dry state for use in a wallboard composition comprising primarily gypsum, an... | 11/20/2001 |
| 6290769 | Lightweight insulating concrete and method for using same A lightweight insulating concrete composition includes a cementitious forming material and a lightweight aggregate combination of expanded vermiculite and expanded perlite, the weight ratio of one to the other not exceeding about 2:1. Preferably, the comp... | 09/18/2001 |
| 6238476 | Method of curing drywall compound A method of reducing the curing time of drywall joint compound, and thereby reducing the time required to finish drywall joints or to repair plaster walls, includes adding a predetermined amount of a drying agent to a conventional ready-mixed drywall join... | 05/29/2001 |
| 6171388 | Lightweight gypsum composition A composition of matter comprising (a) gypsum (CaSO4 . 2H2 O); (b) one or more naturally occurring or synthetic latex polymers; and (c) one or more nonionic surfactants; wherein said composition of matter has a density less than 0.64 g/cm... | 01/09/2001 |
| 6162839 | Composition for producing light plaster, production of the foaming agent used therefor and its use A composition for producing light plaster contains as main constitutive elements particles of plaster in anhydride or hemihydrate form and at least one foaming agent. The composition is characterized in that the foaming agent generates gas after a delay o... | 12/19/2000 |
| 6162288 | Sprayable fireproofing composition Improved sprayable gypsum-based fireproofing composition comprising a lightweight aggregate and a set retarding agent in an amount effective to delay the setting of said composition for at least 24 hours and preferably for at least 72-96 hours without cau... | 12/19/2000 |
| 6039800 | Production of foamed compositions containing gypsum Disclosed is a process of making foamed compositions of water, gypsum, and either or both of alpha-olefin sulfonates and/or amphoteric surfactants of formula (a) or (b) R4 --(OC3 H6)0-1 --(C(O)NH(CH2)... | 03/21/2000 |
| 5922447 | Lightweight gypsum board A lightweight gypsum board is provided, including, by dry weight, gypsum as the largest single ingredient, perlite as the second largest single ingredient, and starch as a minor ingredient, in the board. The starch may be pre-cooked prior to mixing, and i... | 07/13/1999 |
| 5858083 | Cementitious gypsum-containing binders and compositions and materials made therefrom Cementitious binders include calcium sulfate beta-hemihydrate, a cement component comprising Portland cement, and either silica fume or rice-husk ash. The silica fume or rice-husk ash component is at least about 92 wt % amorphous silica and has an alumina... | 01/12/1999 |
| 5824148 | Sound absorbing cementitious composition and method of making same The invention relates to an improved sound absorbing cementitious composition and method of making involving a preformed foam solution made from a surfactant, such as an ammonium salt of a sulfated linear alcohol ethoxylate surfactant, preblended with wat... | 10/20/1998 |
| 5788761 | Process for the manufacture of construction materials A process in which the conventional sulfate components in an aerated concrete mixture, such as gypsum, semihydrate or anhydrite, are replaced at least in part by calcium aluminum sulfates and/or calcium aluminate sulfate hydrates. As a result, agglomerati... | 08/04/1998 |
| 5718759 | Cementitious gypsum-containing compositions and materials made therefrom A cementitious composition useful for water-resistant construction materials, including floor underlayments, backing boards, self-leveling floor materials, road patching materials, fiberboard, fire-proofing sprays, and fire-stopping materials includes abo... | 02/17/1998 |
| 5714001 | Foaming agent composition and process Surfactants containing a mixture of alkyl sulfate and alkyl ether sulfate in specific ratios are provided. Preferred compositions are blends of alkyl sulfate with narrow range alkoxylated alcohols are sulfonated. These compositions are used as improved fo... | 02/03/1998 |
| 5685903 | Cementitious gypsum-containing compositions and materials made therefrom A cementitious composition useful for water-resistant construction materials, including floor underlayments, backing boards, self-leveling floor materials, road patching materials, fiberboard, fire-proofing sprays, and fire-stopping materials includes abo... | 11/11/1997 |
| 5683616 | Process for preparing ceramic-like materials and the ceramic-like materials This invention relates to a process for preparing ceramic-like materials with specific properties by binding an inorganic filler in the form of a dry composition with a grain size of up to 25 μm containing in the volume ratio 1:0.-1.52 a waste phosphogyp... | 11/04/1997 |
| 5663218 | Protection from shocks, capable of deforming progressively and in an irreversible manner Process for protecting articles from shock comprising encasing such articles in a plurality of molded blocks of a composition capable of progressively and irreversibly deforming in response to such shocks, said composition comprising cellulosic fibers dis... | 09/02/1997 |
| 5575844 | Method of preparing gypsum products The invention provides a method of making gypsum products such as plasterboard from foamed gypsum plaster slurry. The method uses a first mixing chamber 10 containing a high speed rotor 14 and inlets 18, 19 for gypsum plaster and water. The initial disper... | 11/19/1996 |
| 5558707 | Fire door core A core for fire doors comprises hydrated gypsum occupying about 40% to 46% of the core volume and bubbles occupying almost all the core volume which is not gypsum. The bubbles preferably comprise about 31% to 38% by volume of larger bubbles of between 1 a... | 09/24/1996 |
