Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7754007 | Gypsum mixtures for forming solids An example embodiment of a mixture to be employed in conjunction with water for preparing a slurry that hydrates to form a high strength flooring compound comprises about 50% to about 98% by weight calcium sulfate hemihydrate, about 0.002% to about 1% by weight poly... | 07/13/2010 |
| 7374611 | Sprayable machinable media In conjunction with water, a mixture can be used to prepare a sprayable slurry that hydrates to form a machinable plaster composition. The mixture includes from about 80% to about 98% by weight calcium sulfate hemihydrate, from about 1% to about 5% by weight adhesiv... | 05/20/2008 |
| 7276115 | Conformable coating A conformable coating for application to a soil substrate for barrier, adhesive, and planting properties includes a mixture of recycled or virgin materials, including organic fibrous material from wood based material and cotton based material, and gypsum bearing mat... | 10/02/2007 |
| 7255731 | Use of particular polysaccharides as admixtures for mineral materials 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 molec... | 08/14/2007 |
| 7211266 | Bone graft substitute composition A composition includes calcium sulfate hemihydrate, stearic acid, an accelerant, and a mixing solution. The composition can be injected, e.g., through a needle, and is capable of setting, e.g., in vivo, in a relatively short period of time to a relatively high hardn... | 05/01/2007 |
| 7101426 | Inorganic matrix composite reinforced by ionically crosslinked polymer 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 b... | 09/05/2006 |
| 7048794 | Organic-inorganic composite An inorganic-organic composite comprises an inorganic phase, such as gypsum crystals, and a film forming organic phase. The film forming organic phase is selected from substituted starches having a degree of polymerization; degree of substitution and viscosity such ... | 05/23/2006 |
| 6893497 | Use of water-soluble polysaccharide derivatives as dispersing agents for mineral binder suspensions 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 hydrolyze... | 05/17/2005 |
| 6824606 | Additive for special plasters and mortars, compositions containing the additive and utilization of the additive in special plasters and mortars 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... | 11/30/2004 |
| 6783587 | Lightweight wallboard compositions containing natural polymers 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 w... | 08/31/2004 |
| 6767647 | Antimicrobial wallboard A gypsum wallboard that exhibits antimicrobial characteristics is disclosed. A method for making the wallboard is also disclosed. Suitable antimicrobial agents that may be applied to the wallboard or any components thereof include propiconazole, sodium pyrithione, t... | 07/27/2004 |
| 6663707 | Water-resistant gypsum formulations Emulsions are provided which are useful in imparting water resistance to gypsum products. In one embodiment, the emulsions comprise a plurality of waxes, at least one saponified wax, a complexed starch, a polymerized alkyl phenol, and a small amount of a ... | 12/16/2003 |
| 6547867 | Non-edible composite material comprising potato peel product The present invention provides adhesive and binder compositions comprising a potato peel product characterized on a dry solids basis by at least 30% starch, at least 5% protein and at least 2% fibers.... | 04/15/2003 |
| 6402832 | Wallboard joint compound The present invention is an improved wallboard joint compound comprising an inorganic joint compound such as, for example, gypsum, mixed with water, plus one or more additives selected to reduce the moisture in the gypsum compound and improve the strength... | 06/11/2002 |
| 6355099 | Plaster mixture for forming a machinable composition A plaster mixture for forming a machinable composition, includes calcium sulfate hemihydrate; an internal lubricating dispersable binder, and an adhesive binder for adhering the plaster mixture to a substrate. In the preferred embodiment, the composition ... | 03/12/2002 |
| 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 |
| 6228163 | Clay-free ready-mixed setting-type joint compound A two part joint compound which sets by hydration of calcium sulfate hemihydrate to gypsum and is clay-free. One part includes an in-situ acidic acrylate copolymer thickener (i.e., an associative thickener) with the calcium sulfate hemihydrate, along with... | 05/08/2001 |
| 6221151 | Gypsum set accelerator and method of making the same A composition for accelerating the setting reaction of an aqueous calcined gypsum slurry, and a method of making the same are disclosed. The composition includes a vibratory ball milled mixture of calcium sulfate dihydrate and a surfactant. The compositio... | 04/24/2001 |
| 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 |
| 6110271 | Methods for improved rheological control in cementitious systems In accordance with the present invention, a microbial polysaccharide having the features characteristic of S-657 has been found to be effective to improve the rheological properties of a variety of cementitious systems. Thus, the addition of a small, but ... | 08/29/2000 |
| 6051059 | Liquid art medium for creating three-dimensional art A liquid art medium for creating three dimensional art comprises sodium bicarbonate, starch, acrylic polymer emulsion, water, and calcium carbonate. The liquid art medium can be applied to a variety of surfaces for various art projects. Once applied, the ... | 04/18/2000 |
| 6013125 | Investment of powders and method for rapid preparation of investment molds The present invention relates to improved investment powders for use in making improved investment molds for casting metals, and the use of such molds with vacuum and/or either conventional, convection conduction or microwave heating apparatus, to rapidly... | 01/11/2000 |
| 5961712 | Method for making shotcrete and such compositions The invention provides cementitious mixtures, particularly for use as shotcrete binding materials. The resultant shotcrete has characteristics of rapid setting as low as 5 to 10 minutes, high early compressive strength (5 to 25 MPa in two hours curing, 20... | 10/05/1999 |
| 5932001 | Plaster composition containing an amylaceous compound The present invention relates to a new plaster, coating or adhesive composition based on plaster, containing an amylaceous compound. The amylaceous compound used according to the invention consists of a cationic amylaceous compound having, characteristica... | 08/03/1999 |
| 5931999 | Liquid art medium for creating three dimensional art A raised liquid art medium comprises baking soda, corn starch, water, gesso, and chalk. The medium can be applied to a variety of surfaces for various art projects. Once applied, the medium can be manipulated while still wet and different colors of the me... | 08/03/1999 |
| 5879446 | Gypsum wallboard, and method of making same A method of preparation of gypsum wallboard, as well as a core composition suitable for use therein, are disclosed. The core composition includes a slurry of calcium sulfate hemihydrate (stucco), water, and calcium aluminum lignosulfonate and/or aluminum ... | 03/09/1999 |
| 5873936 | Cement composition self-leveling floor coating formulations and their method of use A cement composition comprising fine aggregate, preferably sand, in an amount of about 10 to about 25 wt %; blast furnace slag cement, in an amount of about 20 to about 35 wt %; gypsum, in an amount of about 20 to about 35 wt %; Portland cement, in an amo... | 02/23/1999 |
| 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 |
| 5558710 | Gypsum/cellulosic fiber acoustical tile composition An acoustical tile composition based on a gypsum/cellulosic fiber composition which can replace all or a portion of the mineral wool normally present in acoustical ceiling tiles. The gypsum/cellulosic fiber composition is combined with a lightweight aggre... | 09/24/1996 |
| 5505771 | Dental gypsum composition A dental gypsum composition is disclosed, comprising (A) 100 parts by weight of calcined gypsum, (B) from 0.005 to 5.0 parts by weight of an alkali metal tartrate, (C) from 0.1 to 5.0 parts by weight of a sugar alcohol, and (D) from 0.005 to 3.0 parts by ... | 04/09/1996 |
| 5194091 | Geopolymer-modified, gypsum-based construction materials Geopolymer-modified gypsum construction materials. Compositions derived from combining geopolymer adhesives with conventional gypsum wallboard slurry formulations produce an interpenetrating network (IPN) which cures by loss of process water to a refracto... | 03/16/1993 |
| 5183503 | Method of shaker molding and composition therefor An improved molding powder which comprises alkali metal alginate, calcium salt, tetrasodium pyrophosphate and filler, the alginate being from Laminaria hyperborea. The mixture sets to form a rubbery object.... | 02/02/1993 |
| 5174821 | Hydraulic composition, formed products therefrom and segregation reduction agent for hydraulic substances This invention provides a hydraulic composition which contains a cementitious material in powder form, ଲ-1,3-glucan, and a superplasticizer. The composition makes it possible to prepare concrete with high resistance to segregation, high fluidity, an... | 12/29/1992 |
| 5154771 | Hydraulic inorganic composition and molded articles thereof A hydraulic inorganic compositions which comprises a hydraulic inorganic powder at least one of polysaccharides selected from the group consisting of ଲ-1,3-glucans, pullulan and XCD-Polymer in an amount of 0.1-10 parts by weight in relation to 100 p... | 10/13/1992 |
| 5079042 | Drywall joint finishing system A system for finishing the joint between abutting panels of drywall by applying one or two of a joint compound comprising mostly gypsum plaster together with a small amount of monofilament fibers about 4 mm to 10 mm long.... | 01/07/1992 |
| 5041333 | Gypsum board comprising a mineral case A continuous process for the production of gypsum board of variable yet predictable density, wherein a fibrous form of stucco produced from gypsum crystals or fibers is combined with standard calcined gypsum and formed into the board. The density of the r... | 08/20/1991 |
| 4927463 | Aqueous dispersion of gypsum and its use as a filler and coating pigment in the production of paper and cardboard The present invention provides an aqueous dispersion comprising gypsum and a surface-active, anionic compound, wherein the surface-active compound is a phosphoric acid ester selected from the group consisting of (1) an acidic phosphoric acid ester of the ... | 05/22/1990 |
| 4814011 | Investments for dental casting An investment for dental casting comprises a mixture of at least one refractory selected from alumina, zirconia, magnesia clinker, quartz, cristobalite and fused quartz with either a mixture of a soluble phosphate with magnesium oxide or hemi-hydrate gyps... | 03/21/1989 |
| 4724242 | Open cell foamed gypsum absorbents An open-cell, foamed gypsum absorbent for fluids is prepared by foaming a slurry containing plaster, carbonaceous material, and a weak acid. Some of the preferred carbonaceous material include activated carbon, dried blood, comminuted vegetable matter con... | 02/09/1988 |
| 4713115 | Method for demolishing durable structures A durable hard structure is demolished by a method in which one or more holes are formed in a durable hard structure, filling the holes with an aqueous slurry containing a demolition-facilitating clinker composition consisting essentially of (1) 55% by we... | 12/15/1987 |
