Calcium Sulfate Containing (e.g., Anhydrite, Plaster Of Paris, Gypsum, Etc.) Patents (Class 106/680)
  • Patent number: 9873637
    Abstract: The invention relates to an anti-filming surface adjuvant for hydraulic binders comprising at least one fat and at least one anti-caking agent, to its preparation method as well as to a method for preparing a hydraulic binder composition suitable for making screeds or self-compacting concretes (SCC) including the step consisting of adding to the hydraulic binder the adjuvant according to the invention at a dosage comprised between 50 and 1,500 g/m3 of screed or of concrete.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: January 23, 2018
    Assignee: CHRYSO
    Inventors: Sandrine Mateo, Pascal Boustingorry, Bruno Pellerin, David Sedan
  • Patent number: 9764983
    Abstract: A plaster-based material, in particular a plasterboard intended for the interior fitting of dwellings, contains a metal complex of EDTA. The plaster-based material is used for reducing the amount of volatile organic compounds present in the atmosphere inside dwellings, offices or public buildings.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: September 19, 2017
    Assignee: SAINT-GOBAIN PLACO
    Inventors: Katarzyna Chuda, Caroline Demathieu-Roeltgen
  • Patent number: 9221026
    Abstract: A process and system for manufacturing gypsum wallboard that aerates, conditions, and cools a portion of the stucco used in the manufacturing process. This conditioning of the stucco reduces the amount of water needed to manufacture the gypsum wallboard which in turn reduces the amount of energy and cost needed to manufacture the wallboard. The stucco may also be pretreated with water. This process may be carried out using a conveyor that agitates a moving bed of stucco while the top surface of the bed is subject to a low pressure water spray.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: December 29, 2015
    Assignee: National Gypsum Properties, LLC
    Inventors: Matthew M. Hilken, David G. Peterson, Jr., Joseph J. Bailey
  • Publication number: 20150122153
    Abstract: A process for producing insulating foam, wherein certain especially small inorganic minerals such as silica fume are directly integrated into bubble fluid to better mechanically strengthen bubbles formed and thus allow the formation of smaller bubbles to be reformed by mechanical means. In this process where these same bubbles are now in some part composed of inorganic solids. A process whereby these minerals are maintained as to their median size and dispersion within the bubble fluid by the following; rotor stator mixing and or a recirculating pump, the inclusion within exotherming calcium-chloride salt, the use of other physical exciters such as hydrogen-peroxide, and by straining out outliers of unwanted size or form.
    Type: Application
    Filed: November 7, 2014
    Publication date: May 7, 2015
    Applicant: AIR KRETE, INC.
    Inventors: Terry P. Warner, R. Keene Christopher
  • Publication number: 20140342013
    Abstract: Calcium phosphate cement compositions are provided. Aspects of the cement compositions include a dry reactant component comprising a reactive ?-tricalcium phosphate component, a multi-size pore forming calcium sulphate dihydrate component and a demineralized bone matrix component. During use, the dry reactant is combined with a setting fluid to produce a sellable composition that sets into a high strength porous product. Aspects of the invention further include the settable compositions themselves as well as kits for preparing the same. Methods and compositions as described herein find use in a variety of applications, including hard tissue repair applications.
    Type: Application
    Filed: March 14, 2014
    Publication date: November 20, 2014
    Inventors: Jiawei He, David C. Delaney
  • Publication number: 20140272376
    Abstract: Disclosed are cementitious product, as well as cementitious slurry, and method of forming the product. To reduce density in the cementitious product, foam is included in the slurry and in the method of forming the product. The slurry includes cementitious particles, water, and air bubbles such as from compressed air. Instead of using detergent chemistry at the gas/water interface of bubbles, the present invention uses a surface modifying agent for the cementitious particles in the slurry. The modified particles act to produce stable foam in the slurry. As an example mode of introduction, the surface modifier can be added (e.g., as solid or solution) directly into a bulk cementitious slurry that forms the product. As another example, the surface modifier can be added in a separate solution with water, air bubbles, and cementitious particles that serve as additive to the main cementitious slurry, where the separate solution is then added to the main cementitious slurry.
    Type: Application
    Filed: September 18, 2013
    Publication date: September 18, 2014
    Applicant: United States Gypsum Company
    Inventors: Naser ALDABAIBEH, Kumar NATESAIYER, Ashish DUBEY
  • Patent number: 8821629
    Abstract: A pre-mixed mortar, stucco or masonry composition includes from 70 to 80 percent sand and from 20 to 30 percent of a light-weight cement mix composition that comprises either slag cement, Gypsum or a combination of slag cement and gypsum; Portland cement; clay; and polystyrene.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: September 2, 2014
    Inventor: Jorge G. Chiappo
  • Patent number: 8808448
    Abstract: The method for applying a heat insulation layer to an area is characterized in that alpha-hemihydrate or beta-gypsum or lime-alpha-hemihydrate or a mixture thereof is mixed as hydraulic binder with a pore former consisting of aluminum powder, mixed with ground limestone, and citric acid with addition of water and is cast in liquid or pasty form onto the area. The mixture has a pH of 11.8 or more. The constituents are preferably mixed on site, namely in such a consistency that the mixture is self-leveling. Placement on the laying site can e.g. be carried out by means of a floor screed pump. The material expands to the desired total thickness, yielding a homogeneous insulation layer of uniform thickness and quality and of high strength that will reach its high final strength after about 24 hours. The material can also be applied in a pasty consistency to a wall.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: August 19, 2014
    Inventor: Antonius Mertens
  • Publication number: 20140150693
    Abstract: Surfactant-coated hemihydrate gypsum which is coated with 0.01 to 1 part by weight of a surfactant based on 100 parts by weight of hemihydrate gypsum, wherein the residual rate of the surfactant when the surfactant-coated hemihydrate gypsum is heated up to 300° C. is not less than 40 wt % of the amount of the surfactant before heating.
    Type: Application
    Filed: August 21, 2012
    Publication date: June 5, 2014
    Applicant: TOKUYAMA CORPORATION
    Inventors: Shingo Hiranaka, Hiroyoshi Kato
  • Patent number: 8691007
    Abstract: A wallboard, a method of preparing a wallboard, and a method of making a gypsum slurry to prepare a wallboard are provided. The wallboard includes a set gypsum dihydrate derived substantially from a non-fibrous form of calcium sulfate and selected from the group consisting of anhydrous gypsum and gypsum hemihydrate. The wallboard also includes an aerogel dispersed in the gypsum dihydrate.
    Type: Grant
    Filed: September 20, 2012
    Date of Patent: April 8, 2014
    Assignee: Georgia-Pacific Gypsum LLC
    Inventors: Susnata Samanta, Hubert Francis
  • Publication number: 20140026786
    Abstract: A method and system for producing a gypsum product comprising a mixer for mixing gypsum and water and two foam feeds into the system wherein the foam feeds each comprise foam of different bubble size distributions.
    Type: Application
    Filed: April 5, 2012
    Publication date: January 30, 2014
    Applicant: SAINT-GOBAIN PLACO SAS
    Inventor: Hamouda Jaffel
  • Publication number: 20130139728
    Abstract: A method of making a rapid setting lightweight cementitious composition with improved compressive strength for products such as boards is disclosed. The method mixes fly ash, alkali metal salt of citric acid and lightweight aggregate with water. Compositions which include fly ash, alkali metal salts of citric acid and lightweight aggregate are also disclosed.
    Type: Application
    Filed: January 31, 2013
    Publication date: June 6, 2013
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventor: United States Gypsum Company
  • Publication number: 20130074737
    Abstract: A wallboard, a method of preparing a wallboard, and a method of making a gypsum slurry to prepare a wallboard are provided. The wallboard includes a set gypsum dihydrate derived substantially from a non-fibrous form of calcium sulfate and selected from the group consisting of anhydrous gypsum and gypsum hemihydrate. The wallboard also includes an aerogel dispersed in the gypsum dihydrate.
    Type: Application
    Filed: September 20, 2012
    Publication date: March 28, 2013
    Applicant: Georgia-Pacific Gypsum LLC
    Inventor: Georgia-Pacific Gypsum LLC
  • Publication number: 20130025504
    Abstract: The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material, water, and an appropriate amount of one or more enhancing materials chosen from condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material.
    Type: Application
    Filed: September 28, 2012
    Publication date: January 31, 2013
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventor: UNITED STATES GYPSUM COMPANY
  • Publication number: 20120305162
    Abstract: Gypsum plaster board, containing a gypsum matrix and 0.1 to 10% by weight carbon particles, wherein the particle size (d50) of the carbon particles ranges from 0.5 to 4 mm.
    Type: Application
    Filed: February 8, 2011
    Publication date: December 6, 2012
    Applicant: KNAUF GIPS KG
    Inventors: Hans-Ulrich Hummel, Lothar Scheller, Dietmar Stich
  • Publication number: 20120237756
    Abstract: A slurry for manufacturing gypsum board comprises calcined gypsum, water, a foaming agent, and a coalescing agent. The foaming agent imparts a plurality of bubbles in the slurry. Typically, a foam is pre-generated with the foaming agent and the foam is used to form the slurry such that the foam imparts the plurality of bubbles in the slurry. The coalescing agent coalesces the plurality of bubbles imparted by the foam. Typically, the coalescing agent coalesces a plurality of small and partially joined bubbles imparted by the foam to create larger and more discrete bubbles. A gypsum board and method of forming the slurry and the gypsum board are also disclosed. The gypsum board comprises a gypsum layer formed from the slurry. The gypsum layer defines a plurality of bubbles dispersed therein, which are imparted by the foam and coalescing agent of the slurry.
    Type: Application
    Filed: February 23, 2012
    Publication date: September 20, 2012
    Inventors: Ronald A. Lee, David T. Durocher, Sridhar Gopalkrishnan Iyer, Richard J. Romanek, Eli Stav, Karen Fey
  • Publication number: 20120214887
    Abstract: A slurry for manufacturing gypsum board is disclosed. The slurry comprises calcined gypsum, water, a foaming agent, and a thickening agent. The thickening agent of the present disclosure acts to improve the cohesiveness of the slurry without adversely affecting the setting time of the slurry, the paper-to-core bond (wet and dry), or the head of the slurry by acting as a defoaming agent or coalescing agent. Examples of suitable thickening agents include cellulose ether and co-polymers containing varying degrees of polyacrylamide and acrylic acid. A gypsum board and method of forming the slurry and the gypsum board are also disclosed. The gypsum board comprises a gypsum layer formed from the slurry.
    Type: Application
    Filed: February 23, 2012
    Publication date: August 23, 2012
    Applicant: National Gypsum Properties, LLC
    Inventors: Eli Stav, Gopalakrisnan Sethuraman, Ma-ikay Miatudila, Karen Fey
  • Publication number: 20120199350
    Abstract: A method of servicing a wellbore in a subterranean formation, comprising preparing a cement composition comprising water and a cementitious material, wherein the cementitious material further comprises blast furnace slag, vitrified shale, calcium sulfate hemi-hydrate or combinations thereof, and placing the cement composition in the wellbore. A cement composition comprising water and a cementitious material, wherein the cementitious material further comprises blast furnace slag, vitrified shale, calcium sulfate hemi-hydrate or combinations thereof. A cement composition comprising water and a cementitious material, wherein the cementitious material further comprises blast furnace slag.
    Type: Application
    Filed: April 18, 2012
    Publication date: August 9, 2012
    Applicant: HALLIBURTON ENERGY SERVICES, INC.
    Inventors: Lance E. BROTHERS, Anthony V. PALMER
  • Patent number: 8021476
    Abstract: 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% laminated expanded vermiculite; between 0.05% and 0.3% citric acid; between 0.05% and 1% tartaric acid; between 0.01% and 0.5% sodium or potassium citrate; and water q.s.p. 1000 ml, in which, for surface coating, the added vermiculite is obtained following treatment in a vertical furnace, which provides improved grain size and sheets of exfoliated vermiculite without water or air, and the mortar is provided with citric acid and tartaric acid, copper sulphate and sodium or potassium scitrate, with the water being added before the mixture is produced.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: September 20, 2011
    Assignee: Fire Test, S.L.
    Inventors: Barbara Roman Aleman, Pilar Torres Zacarias
  • Patent number: 7837786
    Abstract: The present invention describes improved cellular compositions that contain anhydrite that reaches high compression resistance values, of the order of 110 to 138 Kg/cm2, as well as methods of obtaining of these. The obtained cellular materials with the compositions of the invention can be used like constructive structural materials, and without they present the problems commonly associate to the anhydrous calcium sulphate presence in similar materials.
    Type: Grant
    Filed: March 17, 2005
    Date of Patent: November 23, 2010
    Assignee: GCC Technology and Processes S.A.
    Inventors: Carolina Prieto Gómez, Jaime Valenzuela Grado, Armando García Luna, Pedro Burciaga Meléndez
  • Patent number: 7819993
    Abstract: Provided is a method of manufacturing a weight-saved foamed gypsum board having a gypsum core with high strength and excellent adhesion properties of the gypsum core with base papers for gypsum board, which method is capable of adjusting the sizes of pores in a gypsum core of a weight-saved gypsum board product into a desired range in a short time and at a low cost, even if the kinds and the compounding ratios of gypsum raw materials vary.
    Type: Grant
    Filed: October 15, 2003
    Date of Patent: October 26, 2010
    Assignee: Yoshino Gypsum Co., Ltd.
    Inventors: Masanobu Seki, Yoshitsugu Nakamura
  • Patent number: 7731792
    Abstract: Disclosed herein is a method for producing a recycled hardened material using waste gypsum. The method comprises treating acidic wastewater generated in the production of copper, zinc or titanium or the production of sodium hydroxide (caustic soda) and chlorine using saline water, with calcium hydroxide (slaked lime), so as to precipitate sludge, and mixing the precipitated sludge with pulp sludge ashes having pozzolanic properties.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: June 8, 2010
    Inventor: Jong-Won Park
  • Patent number: 7682445
    Abstract: The present invention deals with the initial hydration reaction of highly alkaline chemically bonded ceramic systems such as Ca-aluminate and Ca-silicate, exhibiting a controlled pH development, reduced from very high levels to be in a pH range of 7-9 by the use of an internal buffer system added to the CBC type biomaterial used. The invention is especially intended for endodontic, orthopaedic applications and/or soft tissue applications and/or drug delivery carrier applications.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: March 23, 2010
    Assignee: DOXA AB
    Inventors: Leif Hermansson, Håkan Engqvist
  • Patent number: 7678189
    Abstract: 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 also reacts with any steel present to form an insoluble iron phosphate coating.
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: March 16, 2010
    Inventor: Edgar Donald Knott
  • Publication number: 20090260544
    Abstract: Disclosed embodiments relate to well treatment fluids and methods that utilize nano-particles. Exemplary nano-particles are selected from the group consisting of particulate nano-silica, nano-alumina, nano-zinc oxide, nano-boron, nano-iron oxide, and combinations thereof. Embodiments also relate to methods of cementing that include the use of nano-particles. An exemplary method of cementing comprises introducing a cement composition into a subterranean formation, wherein the cement composition comprises cement, water and a particulate nano-silica. Embodiments also relate to use of nano-particles in drilling fluids, completion fluids, simulation fluids, and well clean-up fluids.
    Type: Application
    Filed: April 20, 2009
    Publication date: October 22, 2009
    Applicant: Halliburton Energy Services, Inc.
    Inventors: Craig W. Roddy, Jiten Chatterji, Roger Cromwell
  • Publication number: 20090229492
    Abstract: The invention provides a system comprising two components to be mixed together to form a settable cementitious composition wherein a first component comprises: (a) Portland cement; (b) calcium sulphate; and (c) water in a weight ratio of water to Portland cement and calcium sulphate solids of from 0.5:1 to 5:1; and a second component comprises: (d) a water soluble silicate; and (e) water, in a weight ratio of water to silicate solids of from 1.5:1 to 25:1; which cementitious composition has a higher early strength than known compositions.
    Type: Application
    Filed: April 25, 2007
    Publication date: September 17, 2009
    Applicant: Minova International Limited
    Inventor: Peter Shelley Mills
  • Publication number: 20090047545
    Abstract: The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material, water, and an appropriate amount of one or more enhancing materials chosen from condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material.
    Type: Application
    Filed: August 12, 2008
    Publication date: February 19, 2009
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Qiang YU, Steven W. SUCECH, Brent E. GROZA, Raymond J. MLINAC, Frederick T. JONES, Paul J. HENKELS
  • Patent number: 7441600
    Abstract: 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 hydraulic cement material, sufficient water to form a slurry, an expanding additive, and optionally other ingredients including a weighting agent, a retarding or accelerating agent, or the like.
    Type: Grant
    Filed: May 9, 2003
    Date of Patent: October 28, 2008
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Lance E. Brothers, Krishna M. Ravi, Anthony V. Palmer
  • Patent number: 7431763
    Abstract: 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 application in tooth cements, as bone replacement, as bone filler, as bone cement or as bone adhesive.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: October 7, 2008
    Assignee: Kyphon SARL
    Inventor: Michael Zimmermann
  • Publication number: 20080223258
    Abstract: In accordance with a particular embodiment of the present invention, a method for producing a gypsum product includes providing a calcined gypsum powder. Water and an aqueous foam generated from a foaming agent comprising a first portion of sodium decyl sulfate are combined with the calcined gypsum powder to generate a foamed calcined gypsum slurry. The method may also include combining water, a foam generated from a first and second portion of the foaming agent, and the calcined gypsum powder. The second portion of the foaming agent may comprise ammonium decyl ether sulfate and ammonium octyl ether sulfate.
    Type: Application
    Filed: March 13, 2007
    Publication date: September 18, 2008
    Inventors: Robert Bruce, Jennifer L. Worden
  • Publication number: 20080141906
    Abstract: The present invention describes improved cellular compositions that contain anhydrite that reaches high compression resistance values, of the order of 110 to 138 Kg/cm , as well as methods of obtaining of these. The obtained cellular materials with the compositions of the invention can be used like constructive structural materials, and without they present the problems commonly associate to the anhydrous calcium sulphate presence in similar materials.
    Type: Application
    Filed: March 17, 2005
    Publication date: June 19, 2008
    Applicant: GCC TECHNOLOGY AND PROCESSES S.A.
    Inventors: Carolina Prieto Gomez, Jaime Valenzuela Grado, Armando Garcia Luna, Pedro Burciaga Melendez
  • Patent number: 7303015
    Abstract: Methods and compositions for wellbore treating fluids, especially cementitious compositions that include interground cement clinker and zeolite, with and without gypsum.
    Type: Grant
    Filed: November 8, 2006
    Date of Patent: December 4, 2007
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Glen C. Fyten, Karen Luke, Keith A. Rispler
  • Patent number: 7220373
    Abstract: 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?M+, in which n is a number between 6 and 16, M is a monovalent cation and the mean number of carbon atoms nm is from 9 to 10, and the introduction of the foam obtained into a plaster slurry, characterized in that the amount of surfactant introduced does not exceed 0.32 g/l of plaster slurry. Application to the manufacture of lightened plasterboards.
    Type: Grant
    Filed: March 5, 2002
    Date of Patent: May 22, 2007
    Assignee: Lafarge Platres
    Inventors: Daniel Martin, Robert Garcin
  • Patent number: 7033431
    Abstract: 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 composition nm being between 10 and 11, and M is a monovalent cation. A process for the preparation of the gypsum composition and a gypsum board obtainable from this composition. Finally, a process for the manufacture of gypsum boards. Application for the manufacture of foamed gypsum boards.
    Type: Grant
    Filed: September 14, 2001
    Date of Patent: April 25, 2006
    Assignee: Lafarge Platres
    Inventors: Daniel Martin, Robert Garcin, Serge Sabio
  • Patent number: 6893752
    Abstract: 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 mold-resistant gypsum product is also provided. A slurry of calcined gypsum, water and a water-soluble pyrithione salt is formed, then deposited on a sheet of facing material. The slurry on the facing material is shaped into a panel and maintained under conditions sufficient for the calcined gypsum to react with the water to form a core comprising an interlocking matrix of set gypsum crystals. Heating of the panel causes evaporation of the water that did not react with the calcined gypsum.
    Type: Grant
    Filed: June 28, 2002
    Date of Patent: May 17, 2005
    Assignee: United States Gypsum Company
    Inventors: Srinivas Veeramasuneni, Rodney Phillip Musselman
  • Patent number: 6806298
    Abstract: 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-repellent. Other materials such as clay, fibrous material, a foam producing agent and a hardening retarder can be included in the composition. The composition is effective as a cover layer over material such as soil, refuse at a dump site, stockpiled material, a temporary cover for remediation sites, or tire piles.
    Type: Grant
    Filed: July 27, 2000
    Date of Patent: October 19, 2004
    Assignee: New Waste Concepts, Inc.
    Inventors: Thomas J. Nachtman, John H. Hull, Patrick O'Shea
  • Patent number: 6774146
    Abstract: 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 condensate alkali salt polymer having a weight average molecular weight of from about 17,000 to about 47,000. The alkali is preferably an alkali metal and/or an alkaline earth metal. The aldehyde is preferably formaldehyde. The foaming agent used in the combination according to the invention is a soap, preferably an alkali salt of an alkyl ether sulfate and/or an alkyl sulfate. The combination of a high molecular weight dispersant and a foaming agent produces a gypsum wallboard core effect that more efficiently entrains air (i.e., creates void space), thereby lowering overall board weight without detrimentally affecting strength.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: August 10, 2004
    Assignee: GEO Specialty Chemicals, Inc.
    Inventors: Arpad Savoly, Dawn P. Elko, Bennie Veal, James McCrary
  • Patent number: 6773500
    Abstract: 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 the desired cellular structure. The composition can be self cured at ambient temperature and pressure without the need for ovens or autoclaves. The cured compositions can be easily cut into the desired shape by a band saw or the like.
    Type: Grant
    Filed: May 31, 2001
    Date of Patent: August 10, 2004
    Assignee: ISG Resources, Inc.
    Inventors: Steve R. Creamer, Bruce Boggs, Robert M. Bergman, Ryan Creamer
  • Publication number: 20040065232
    Abstract: An adhesive composition comprising a polymeric matrix and absorbent particles wherein at least a part of the absorbent particles are microcolloid particles. The microcolloid particles are water absorbent particles preferably having a rounded or of microcolloids to an adhesive handling properties compared to state of the art technology as well as the rheological properties of the adhesive matrix may be less affected than by addition of traditional hydrocolloids.
    Type: Application
    Filed: August 18, 2003
    Publication date: April 8, 2004
    Inventor: Mads Lykke
  • Patent number: 6706128
    Abstract: 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 method of providing void spaces in a gypsum wallboard comprising the step of adding air bubbles having different relative stabilities to a gypsum slurry, wherein the less stable air bubbles are sufficiently unstable such that they coalesce on contact with each other in the slurry to form larger air bubbles, and the weight ratio of the less stable air bubbles to the more stable air bubbles initially added to the slurry is such that there are a sufficient number of more stable air bubbles to prevent a majority of the less stable air bubbles from becoming large enough to rupture before the slurry sets sufficiently to prevent the slurry from filling void spaces left by ruptured bubbles.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: March 16, 2004
    Assignee: National Gypsum Properties, LLC
    Inventor: Gopalakrishnan Sethuraman
  • Publication number: 20040045481
    Abstract: Compositions useful for the preparation of lightweight, high strength wallboards, and methods of making same are disclosed. The composition includes a slurry of calcium sulfate hemihydrate (stucco), water, starch, and a foam. The foam acts to provide large bubbles within the core slurry, thereby lightening the weight of the wallboard. The composition and method provide wallboards having lighter weights compared to standard wallboard, increased core strength, and increased paper-to-core bonding.
    Type: Application
    Filed: September 11, 2002
    Publication date: March 11, 2004
    Applicant: National Gypsum Properties, LLC
    Inventors: Gopalakrishnan Sethuraman, Elisha Stav, Lambert J. Metz
  • Patent number: 6692615
    Abstract: 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 may be used in sheet form or comminuted pieces.
    Type: Grant
    Filed: April 16, 2002
    Date of Patent: February 17, 2004
    Inventor: Timothy D. Cathey
  • Patent number: 6626991
    Abstract: 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 (volume ratio of liquid fraction over solid fraction) lying in the range 38% to 50%. The solid fraction is constitued by a mixture of lightweight particles, microcement and optionally portland cement and gypsum. Such cements have remarkable mechanical properties due to their very low porosity in spite of having very low density.
    Type: Grant
    Filed: July 2, 2002
    Date of Patent: September 30, 2003
    Inventors: Bruno Drochon, Andre Garnier
  • Patent number: 6569541
    Abstract: 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 calcium sulfate, a water-repellent agent comprising at least one silicone compound, and water and preforming said substrate in the wet state; (b) drying the preformed substrate in order to obtain said substrate formed in the solid and dry state; wherein the homogeneous mix, prior to the preforming of the substrate in the wet state, also includes a mineral additive comprising at least one mineral component having a synergistic water-repellency affinity with said silicone compound.
    Type: Grant
    Filed: February 10, 2000
    Date of Patent: May 27, 2003
    Assignee: Lafarge Platres
    Inventors: Daniel Martin, Théo Theuvsen, Régis Humbert
  • Patent number: 6511537
    Abstract: 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-phosphates (ortho-phosphates PO42; meta-phosphates PO3), acyclic poly-phosphates (pyrophosphates P2O74, tripolyphosphates P3O105) or cyclic poly-phosphates. The system preferably may also comprise a retarder booster and is more particularly applicable to cementing at low or medium temperatures.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: January 28, 2003
    Assignee: Schlumberger Technology Corporation
    Inventors: Véronique Barlet-Gouedard, Fabien J. Brand, Pierre Maroy, Frederik Nilsson
  • Publication number: 20020121326
    Abstract: Gypsum plaster compositions with improved adhesion to plastic surfaces and metal surfaces comprise from 10 to 90% by weight of gypsum plaster, based on the total weight of the composition, and also, where appropriate, other additives, and a combination of: a) one or more water-redispersible polymer powders based on one or more vinyl ester, (meth)acrylate, vinylaromatic, olefin, 1,3-diene, or vinyl halides monomers, and optionally other monomers copolymerizable therewith; and b) one or more alkali metal and/or alkaline earth metal salts of short-chain fatty acids having from 1 to 4 carbon atoms in the hydrocarbon skeleton and from 1 to 4 carboxy groups, and which contain no OH groups.
    Type: Application
    Filed: November 7, 2001
    Publication date: September 5, 2002
    Applicant: Wacker Polymer Systems GmbH & Co. KG
    Inventors: Klaus Adler, Alois Sommerauer
  • Patent number: 6406755
    Abstract: 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 causing the composition to swell or shrink or to cause a salt layer to form on the composition when it is spray-applied. The fireproofing composition can retain fluidity in conventional spray hoses overnight and yet is capable of being injected with a set accelerator, such as aluminum sulfate, on the next day or on a successive day when spray-applied onto a substrate.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: June 18, 2002
    Assignee: W.R. Grace & Co.-Conn.
    Inventors: Lawrence J. Kindt, Dennis M. Hilton, Richard P. Perito
  • Patent number: 6387172
    Abstract: 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) comprising an elevated ratio of water to calcined gypsum. Also disclosed is an article comprising the set gypsum composition.
    Type: Grant
    Filed: April 25, 2000
    Date of Patent: May 14, 2002
    Assignee: United States Gypsum Company
    Inventors: Qiang Yu, Srinivas Veeramasuneni, Frederick Thomas Jones
  • Patent number: 6376558
    Abstract: 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 segment directly into the chamber so that the incoming pressurized gas meets the mixture with a shearing action along the wall or bottom.
    Type: Grant
    Filed: January 6, 2000
    Date of Patent: April 23, 2002
    Assignee: Babcock-BSH GmbH
    Inventors: Friedrich Bahner, Kurt Braun, Helmut Eidam, Horst Hose, Karl Maurer, Frank Ullsperger
  • Patent number: 6340388
    Abstract: 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, and in a wallboard composition comprising an expanded mineral such as Perlite which largely reduces the amount of gypsum over current gypsum wallboard formulations, thus reducing the weight while maintaining the strength of the wallboard structure. In a preferred embodiment, the lightweight, strengthened wallboard of the present invention also comprises an optional covering veneer that is applied to the top ply of the face paper to provide increased strength, moisture resistance, and fire retardency, and the back paper top ply is treated to provide increased flexural strength.
    Type: Grant
    Filed: April 12, 2000
    Date of Patent: January 22, 2002
    Assignee: Advanced Construction Materials Corp.
    Inventor: Joseph S. Luongo