Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7256227 | Polymer modified gypsum membrane and uses therefor A composition which is applied to substrate surfaces to form a membrane to provide structural reinforcement thereto and prevent the release of gases and moisture from the substrate. The composition consists of polymer resin binders and gypsum. Further provided is a ... | 08/14/2007 |
| 7244305 | Antibacterial gypsum composition for dental surgery Disclosed is an antibacterial gypsum composition for dental surgery, which eliminates pathogens transferred from the mouth of a patient, so that a dentist or others participating in dental surgery can be prevented from being infected by such pathogens during the wor... | 07/17/2007 |
| 7241819 | Method of levelling a floor A two-pack cementitious composition consisting of iii) an alkaline component comprising gypsum, an alkaline polymer, water and a hydration inhibitor, which is stable in a fluid state and which can be set and hardened upon the addit... | 07/10/2007 |
| 7041167 | Low density accelerant and strength enhancing additive for cementitious products and methods of using same Disclosed are concrete and fiber cement formulations and products comprising low-density calcium silicate hydrate, and methods for producing these formulations and products. The disclosed formulations exhibit accelerated curing times. Other advantages of the disclos... | 05/09/2006 |
| 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 |
| 6805741 | Ready-mixed setting-type composition and related kit A ready-mixed composition, which sets when mixed with an activator for the reaction of calcined gypsum with water to form set gypsum, is disclosed. The composition comprises water and calcined gypsum in a weight ratio of water to calcined gypsum of from about 0.15 t... | 10/19/2004 |
| 6740395 | Substrate smoothed by coating with gypsum-containing composition and method of making A rough-surfaced substrate, such as a fiberboard, is provided with a smoother surface by applying a coating comprising calcium sulfate hemihydrate which has been prevented from hydrating to gypsum by set preventer, and which sets when brought into contact with a set... | 05/25/2004 |
| 6699339 | Gypsum plaster compositions with improved adhesion to plastic surfaces and metal surfaces 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... | 03/02/2004 |
| 6695901 | Gypsum casting composition and method of casting I provide a multi-part aqueous gypsum dental casting composition having gypsum and water and wherein (a) one or more of a first compound is mixed in the gypsum and/or water; or (b) one or more of the first compound and one or more of a second compound are... | 02/24/2004 |
| 6632550 | Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it 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... | 10/14/2003 |
| 6379458 | Efficient set accelerator for plaster A set accelerator for at least one of accelerating the hydration rate and reducing the set time of an aqueous slurry of calcium sulfate hemihydrate is described. The set accelerator consists of a mixture of ground calcium sulfate dihydrate and zinc sulfat... | 04/30/2002 |
| 6352585 | Gypsum casting composition and method of casting A multipart gypsum casting composition comprising a gypsum composition and a water composition where either the water and/or the gypsum composition contains at least two acids selected from the group consisting of oxalic acid, boric acid, phosphoric acid,... | 03/05/2002 |
| 6342284 | Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it 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... | 01/29/2002 |
| 6264739 | Dispersant for plaster An dispersant for plaster comprising a copolymer prepared by copolymerizing (a) a polyalkylene glycol monoester monomer having 2 to 300 mols of an oxyalkylene group(s) each having 2 to 3 carbon atoms, with (b) at least one monomer selected from among acry... | 07/24/2001 |
| 6171387 | Reversible agglomeration of fine particle plaster of Paris A method for the reversible agglomeration of fine particles of plaster of Paris (CaSO4.1/2H2 O) and agglomerates made by the method which comprises agitating the fine particles in the presence of an organic polar liquid preferably ne... | 01/09/2001 |
| 5997632 | Blended hydraulic cement The present invention is directed to blended hydraulic cement compositions which are formed with subbituminous fly ash. In one embodiment, the cement composition comprises from about 0.1 wt. % to about 7 wt. % of a retarding agent; from about 0.1 wt. % to... | 12/07/1999 |
| 5980628 | Curable gypsum-containing composition and method for stabilization of unconsolidated core samples A curable gypsum-based composition for the production cured gypsum matrix. The composition comprises two-components, the first component includes calcined gypsum suspended in water, and a set retarding substance comprising (i) an organic acid containing a... | 11/09/1999 |
| 5888322 | Polymeric oxyalkylate viscosity modifiers for use in gypsum wallboard production Methods for making gypsum wallboard and for enhancing the compressive strength of wallboard by the addition of polymeric oxyalkylate viscosity modifiers are described. Preferred compounds are a copolymer comprising blocks of ethylene oxide and propylene o... | 03/30/1999 |
| 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 |
| 5846317 | Method of controlling the hydration behavior of gypsum in the manufacture of composite materials A method of controlling the ratio of hydration time (HT) to open time (OT) in the manufacture of composite materials from a mixture containing hydratable calcium sulphate such as gypsum binders, aggregates, fibers, water additives and other additives is d... | 12/08/1998 |
| 5746822 | Ready-mixed setting type joint compound A cementitious composition of the setting type which can be kept in a ready-mixed state and which can be caused to set and harden upon introduction of an accelerator with reproducibility and set time predictability. The cementitious base composition conta... | 05/05/1998 |
| 5731034 | Method of coating paper A method of coating paper with a paper coating composition having a solids concentration of at least 45% by weight, consisting essentially of an aqueous cationic dispersion of a particulate calcium carbonate pigment and a nonionic or cationic adhesive, wh... | 03/24/1998 |
| 5709743 | Setting and hardening accelerating agent for siliceous hydraulic binders Setting and hardening accelerating agent for siliceous hydraulic binders wherein: a) it is obtained by hydration, in the usual pressure and temperature conditions, and grinding of a siliceous hydraulic binder aqueous suspension; b) the suspension particle... | 01/20/1998 |
| 5658379 | Wood filler The present invention provides a filler for wood products, especially those intended for indoor use, This filler can include a putty including a mixture of calcium sulphate and calcium oxide (or a compound forming calcium oxide when heated); at least one ... | 08/19/1997 |
| 5639298 | Modified gypsum compositions A set control composition and/or interground blend of materials including a calcium sulfate material and magnesium sulfate.... | 06/17/1997 |
| 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 |
| 5569324 | Cementitious compositions The present invention provides improved cementitious compositions which can include drilling fluid as a component thereof and methods of cementing wells utilizing such compositions. The compositions are basically comprised of a cementitious material, wate... | 10/29/1996 |
| 5472500 | High strength, abrasion resistant veneer plaster A veneer plaster having strengths of substantially greater than 3,000 psi, abrasion resistance of penetrations less than 0.04 inch with 1,000 cycles of a five-pound brush using a 3M Granule Embedding Testing Machine, made from about 1,800 pounds of calciu... | 12/05/1995 |
| 5439518 | Flyash-based compositions Binder compositions are provided which are principally composed of a lime-containing flyash, and optionally hydratable gypsum, with a small amount of a property improving additive. The compositions are capable of setting when mixed with sufficient water t... | 08/08/1995 |
| 5437722 | Water-resistant gypsum compositions and emulsion for making same The water resistance of gypsum compositions, such as those used in gypsum wallboard, is improved by incorporating in the compositions an aqueous emulsion containing a paraffinic hydrocarbon having a melting point of 40° to 80° C., montan wax and polyvin... | 08/01/1995 |
| 5424099 | High strength pourable gypsum floor underlayments and methods of providing same The invention relates to a gypsum-based cementitious composition capable of upon mixing with fine aggregate in a weight ratio to said gypsum-based cementitious composition of from about 1.25:1 to 2.5:1; and sufficient water to provide a pumpable, self-lev... | 06/13/1995 |
| 5401538 | Sprayable portland cement-based fireproofing compositions Sprayable fireproofing compositions for structural members such as steel columns are provided, as well as a method of applying multiple coatings thereof. The compositions comprise a Portland cement-based material, stucco, a high density aggregate and an a... | 03/28/1995 |
| 5378277 | Injection product for fine sands and other porous matter An injection product for fine sands and other porous matter. This product comprises, on the one hand, cement and an alkaline silicate and, on the other hand, an agent inhibiting the reaction between the above two constituents. Application is in the field ... | 01/03/1995 |
| 5340385 | Hydraulic cement set-accelerating admixtures incorporating glycols New set-accelerating admixtures for hydraulic cement compositions are disclosed. These admixtures incorporate known set accelerators and certain low molecular weight glycols, e.g., glycerol and ethylene glycol, are found to be surprisingly effective in de... | 08/23/1994 |
| 5340612 | Sprayable portland cement-based fireproofing compositions Sprayable fireproofing compositions for structural members such as steel columns are provided, as well as a method of applying multiple coatings thereof. The compositions comprise a Portland cement-based material, stucco, and an accelerator. The compositi... | 08/23/1994 |
| 5336316 | Cementing composition and method using phosphonated polymers to improve cement slurry properties An oil and gas well cementing composition and method is shown utilizing hydraulic cement, water and an additive having pendant phosphonate groups on a polymeric backbone. The additive provides improved fluid loss and settling characteristics while maintai... | 08/09/1994 |
| 5277712 | Dry mix-type joint compounds, compositions therefrom and methods for filling drywall joints with same A dry mix-type, drywall panel joint compound is produced which comprises (a) a fine plaster which is applied to a joint formed between adjacent drywall panels in the plastic state to form a hardened material, (b) a material which imparts internal strength... | 01/11/1994 |
| 5273579 | Quick setting compositions The present invention concerns a quick setting composition capable of obtaining satisfactory strength developability irrespective of the fluctuation of the ingredients in a metallurgical slag, excellent in the strength developability at cold temperature, ... | 12/28/1993 |
| 4911759 | Dental gypsum compositions in low-dusting powdery form A dental gypsum composition in the low-dusting powdery form contains (a) hemihydrate gypsum, (b) a setting controlled agent comprising one or more of setting accelerators, setting retarders and setting expansion inhibitors, (c) one or more wetting agents ... | 03/27/1990 |
| 4904503 | Rapid setting cementitious fireproofing compositions and method of spray applying same A method is provided whereby the setting time of a spray applied hydraulic cement-based fireproofing composition is decreased substantially while improving the yield of the composition. An acidic set accelerating agent is thus introduced into the composit... | 02/27/1990 |
