| Patent Number |
Title Of Patent |
Date Issued |
| 6805741 |
Ready-mixed setting-type composition and related kit |
October 19, 2004 |
| 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 to about 0.5, as well a |
| 6800131 |
Gypsum-containing board and tile, and method for producing gypsum-containing board and tile |
October 5, 2004 |
| 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 conden |
| 6752895 |
Water spray for smooth surface gypsum fiberboard panels |
June 22, 2004 |
| An improved method and apparatus for imparting a smooth surface to gypsum fiber panels. The method involves imparting energy to the surface of a slurry as the slurry is dewatered just prior to rehydration. The apparatus used to impart the energy is a water spray including a source of |
| 6740395 |
Substrate smoothed by coating with gypsum-containing composition and method of making |
May 25, 2004 |
| 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 initiator, e.g. a |
| 6733261 |
Apparatus for smooth surface gypsum fiberboard panels |
May 11, 2004 |
| An improved method and apparatus for imparting a smooth surface to a gypsum fiber panels. The method involves imparting energy to the surface of the slurry as the slurry is dewatered just prior to rehydration. The apparatus used to impart the energy is an air lance including an air sourc |
| 6673144 |
Joint compound providing low dusting and good gloss retention |
January 6, 2004 |
| The present invention provides a low dusting joint compound comprising a filler, a binder, a thickener and one or more synthetic polymeric waxes that are at least slightly soluble in water and are solid at room temperature. Preferably the wax includes a high molecular weight polyethy |
| 6663979 |
Coating for gypsum board face with uniform gloss intensity |
December 16, 2003 |
| A coating for gypsum board includes a binder, a soy protein, and two or more pigments. Two of the pigments include calcium carbonate and magnesium carbonate and the magnesium carbonate makes up at least 20% by weight of the coating on a dry basis. |
| 6641658 |
Rapid setting cementitious composition |
November 4, 2003 |
| A rapid setting cementitious composition useful for making cement boards employs an insoluble form of anhydrous calcium sulfate (anhydrite) to accelerate setting and to permit reducing the amount of high alumina cement usage. |
| 6632550 |
Gypsum-containing product having increased resistance to permanent deformation and method and co |
October 14, 2003 |
| 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 conden |
| 6620487 |
Structural sheathing panels |
September 16, 2003 |
| A reinforced, lightweight, dimensionally stable panel capable of resisting shear loads when fastened to framing equal to or exceeding shear loads provided by plywood or oriented strand board panels. The panels employ a core of a continuous phase resulting from the curing of an aqueous mi |
| 6605186 |
Headbox for gypsum/fiber board production |
August 12, 2003 |
| A headbox for use in a water felting process includes a housing and two rotating horizontal distribution rolls. The housing has curved sections shaped to conform to the outer cylindrical surface of the distribution rolls, wherein the curved section is closely spaced to a portion of the |
| 6545066 |
Lightweight ready-mix joint compound |
April 8, 2003 |
| The joint compound of the present invention utilizes hollow resin microspheres with a mean particle size less than 75 microns and exhibiting no more than 1.5% increase in density under high shear stress testing. |
| 6531210 |
Application of methylenediphenyldiisocyanate for producing gypsum/wood fiber board |
March 11, 2003 |
| A process for making an improved gypsum/wood fiber board is described. Products resulting from the process are also described. The process comprises adding a diisocyanate, specifically methylenediphenyldiisocyanate (MDI) to an aqueous slurry of calcium sulfate material and cellulosic |
| 6494609 |
Slurry mixer outlet |
December 17, 2002 |
| An apparatus and method for delivering an additive-enhanced slurry for use in making gypsum wallboard, and configured for connection to a centrifugal mixer with a tangential discharge outlet, includes a conduit having a main inlet in slurry receiving communication with the mixer outlet a |
| 6481171 |
Gypsum compositions and related methods |
November 19, 2002 |
| 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 rati |
| 6476099 |
Joint compound additive for reduction of cracking, cratering and shrinkage |
November 5, 2002 |
| A joint compound composition comprising a filler, a binder and a hydrocarbon substituted sulfate, sulfonate, sulfuric acid or sulfonic acid is disclosed. The composition of the present invention produces a joint compound that shrinks less and is resistant to cracking and cratering. |
| 6475313 |
Process for making gypsum board having improved through-penetration strength |
November 5, 2002 |
| This invention relates to a process for making gypsum board comprising feeding a paper backing sheet and a fiberglass or plastic woven or non-woven scrim material in alignment to a board forming station, separating the paper and the scrim, feeding a high density calcium sulfate hemih |
| 6416695 |
Method for making smooth surfaced gypsum fiberboard panel |
July 9, 2002 |
| An improved method and apparatus for imparting a smooth surface to a gypsum fiber panels. The method involves imparting energy to the surface of the slurry as the slurry is dewatered just prior to rehydration. The apparatus used to impart the energy is an air lance including an air sourc |
| 6413376 |
Headbox for gypsum/fiber board production |
July 2, 2002 |
| A headbox for use in a water felting process includes a housing and two rotating horizontal distribution rolls. The housing has curved sections shaped to conform to the outer cylindrical surface of the distribution rolls, wherein the curved section is closely spaced to a portion of the |
| 6409825 |
Wet gypsum accelerator and methods, composition, and product relating thereto |
June 25, 2002 |
| A wet gypsum accelerator comprising particles of calcium sulfate dihydrate, water, and at least one additive selected from the group consisting of (i) an organic phosphonic compound, (ii) a phosphate-containing compound, or (iii) a mixture of (i) and (ii), is disclosed. Also disclosed ar |
| 6409824 |
Gypsum compositions with enhanced resistance to permanent deformation |
June 25, 2002 |
| A set gypsum-containing composition is disclosed. In one aspect, the set gypsum-containing composition includes an interlocking matrix of the set gypsum formed from at least calcined gypsum, water, and an enhancing material. The enhancing material can be selected from (i) an organic |
| 6409823 |
Hydration enhancing additives |
June 25, 2002 |
| An additive for accelerating the setting reaction of gypsum products is disclosed. It comprises a gypsum accelerator combined with a bisulfate salt. The gypsum accelerator is calcium sulfate dihydrate. The accelerator may optionally be ground with a sugar, a starch and/or boric acid. A |
| 6406537 |
High-strength joint compound |
June 18, 2002 |
| A composition comprising calcined gypsum, trimetaphosphate ion, and a water-soluble linear polymer formed by the addition reaction of ethylene oxide and/or alkoxy-substituted ethylene oxide with water, having enhanced strength when set and exhibiting high plasticity and workability such |
| 6398864 |
Pottery plaster formulations for the manufacture of plaster molds |
June 4, 2002 |
| A plaster composition for making molds for reproduction by casting is disclosed. Calcium sulfate hemihydrate, potassium sulfate and potassium sodium tartrate are mixed together. The potassium sulfate and potassium sodium tartrate are in a ratio of from about 1:1 to about 10:1. Potassium |
| 6387172 |
Gypsum compositions and related methods |
May 14, 2002 |
| 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 rati |
| 6379458 |
Efficient set accelerator for plaster |
April 30, 2002 |
| 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 sulfate material. Aluminum sulfate mate |
| 6355099 |
Plaster mixture for forming a machinable composition |
March 12, 2002 |
| 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 includes calcium sulfate hemi |
| 6273345 |
High performance slurry spray machine |
August 14, 2001 |
| A slurry spray machine for spraying a settable slurry includes a main passageway configured for receiving a supply of pressurized slurry and having a supply end and an outlet end opposite the supply end. A first compressed gas inlet is disposed intermediate the supply and outlet ends |
| 6268042 |
High strength low density board for furniture industry |
July 31, 2001 |
| A high strength, low density fiber board panel for use in the furniture industry is provided, including mineral wool, a lightweight aggregate material, cellulosic fiber, a binding agent and gypsum. The mineral wool makes up approximately 0% to 33%, the lightweight aggregate material |
| 6241815 |
Gypsum-cement system for construction materials |
June 5, 2001 |
| A composition for use in construction materials, which may be substituted for high performance concrete, patching materials, joint compounds, and the like, such as backer boards or panels, which includes a settable calcium sulfate, preferably a hemihydrate, Portland cement, a finely |
| 6233890 |
Drainable sheathing membrane for exterior wall assembly water management system |
May 22, 2001 |
| An exterior wall assembly water management system that includes flashing, a drainable weather-resistive membrane, exterior cladding, a basecoat and an exterior finish. The basecoat and the exterior stucco finish are applied to the outer surface of the exterior cladding, or in the alterna |
| 6228163 |
Clay-free ready-mixed setting-type joint compound |
May 8, 2001 |
| 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 a non-calcium bearing phosph |
| 6217946 |
Method for applying polymeric diphenylmethane diisocyanate to cellulose/gypsum based substrate |
April 17, 2001 |
| The disclosed invention consists of a means for conveying a gypsum or gypsum/cellulose fiber board to a rotary cylinder brush station where pMDI resin is delivered onto the rotary cylinder brush just as the board passes under the brush. A resin distribution system is used to coat the rot |
| 6197235 |
Method of manufacture for textured surface panels and panel products made therefrom |
March 6, 2001 |
| An improved method for texturing gypsum fiber panels and producing surface textured panels, edge tapers, and deeper patterned wainscot-type panels, involving the use of a flexible die with a textured surface. The die is pressed onto the panel in its slurry state just after the onset of a |
| 6153040 |
Gypsum board paper that reduces roll up during lamination, and board comprising such paper |
November 28, 2000 |
| A process for reducing rollups in gypsum board panels when the panels are laminated with a laminate, is provided. A laminator is provided, as is at least one gypsum board panel, each panel having a face paper layer and a backing paper layer. Each paper layer has a coefficient of friction |
| 6138377 |
Apparatus and process for cooling and de-steaming calcined stucco |
October 31, 2000 |
| The present invention is an apparatus and process for cooling and de-steaming hot calcined stucco used in the production of gypsum boards or bagged plaster. The apparatus is a fluid bed stucco cooler and comprises a cooler housing having a plenum with two chambers, a first chamber having |
| 6059444 |
Apparatus for mixing calcined gypsum and its method of operation |
May 9, 2000 |
| This invention provides a method and apparatus for mixing calcined gypsum. The invention comprises a mixer which employs high pressure water to eliminate or substantially reduce the formation of lumps of gypsum inside the mixer which cause paper breaks when the calcined gypsum slurry |
| 6010596 |
Gypsum wood fiber product having improved water resistance |
January 4, 2000 |
| An improved water resistant gypsum board is made by adding an aqueous wax emulsion containing a cationic surfactant to an aqueous slurry containing calcium sulfate and host particles at a slurry temperature which maintains calcium sulfate hemihydrate crystals. The wax emulsion is stable |
| 5945198 |
Coated wallboard employing unbleached face paper comprising a coating containing soy protein |
August 31, 1999 |
| A coating for providing a cover sheet used in the manufacture of wallboard with a light colored finish without the use of manila top plies is disclosed. The coating has a porosity adapted to allow evaporation of moisture from the wallboard core through the cover sheet, and maintain a |
| 5932019 |
Method for cleaning and minimizing the buildup of set gypsum |
August 3, 1999 |
| The present invention relates to a method for minimizing the buildup of set gypsum on a tool used to apply a calcium sulfate hemihydrate-containing composition to a surface as well as to a method for cleaning a tool having set gypsum deposited thereon. The method for cleaning a tool havi |
| 5927968 |
Apparatus for continuous refractoryless calcining of gypsum |
July 27, 1999 |
| A method and apparatus is disclosed for the continuous calcining of gypsum material in a high-efficiency, refractoryless kettle preferably heated by a multiple series of separate immersion tube burner coils, each coil operating within a specific calcining zone inside the kettle. The lowe |
| 5922447 |
Lightweight gypsum board |
July 13, 1999 |
| 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 is dispersed in the core of the bo |
| 5817262 |
Process of producing gypsum wood fiber product having improved water resistance |
October 6, 1998 |
| A process is described for making a gypsum board having improved water resistance. The resulting gypsum board products are also described. The process comprises adding an aqueous siloxane emulsion to an aqueous slurry of a calcium sulfate material and host particles, where the siloxane |
| 5746822 |
Ready-mixed setting type joint compound |
May 5, 1998 |
| 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 contains calcium sulfate hemihydra |
| 5743954 |
Method for continuous refractoryless calcining of gypsum |
April 28, 1998 |
| A method and apparatus is disclosed for the continuous calcining of gypsum material in a high-efficiency, refractoryless kettle preferably heated by a multiple series of separate immersion tube burner coils, each coil operating within a specific calcining zone inside the kettle. The lowe |
| 5683635 |
Method for preparing uniformly foamed gypsum product with less foam agitation |
November 4, 1997 |
| The invention provides an improved method for preparing foamed gypsum products. The invention can utilize a single mixing chamber and significantly improve the efficiency of foaming agent usage. In the method of the invention the point of insertion of aqueous foam into calcined gypsu |
| 5336318 |
Clay-free, asbestos-free and glass microbubble-free drying type joint compounds |
August 9, 1994 |
| A clay-free, asbestos-free and glass microbubble-free, drying type Joint compound containing an in-situ or associative thickener as a substitute for asbestos and any clay substitute therefor. In particular, these drying type joint compounds contain no attapulgus clay thereby improving |
| 5320677 |
Composite material and method of producing |
June 14, 1994 |
| An improved composite material is produced by mixing gypsum and host particles of a stronger substance, such as wood fibers, in a dilute slurry; heating the slurry, under pressure, to convert the gypsum to calcium sulfate alpha hemihydrate; and substantially dewatering the hot slurry |
| 5221386 |
Cement board having reinforced edges |
June 22, 1993 |
| A cement board having bare surfaces and a woven mesh of reinforcing fibers underlying the top, bottom, and longitudinal edge surfaces is made continuously on an improved apparatus which comprises a pair of edger rails which slidably rest on a conveyor belt and define the path of the |
| 5154361 |
Comminution of plastic scrap |
October 13, 1992 |
| A method for comminuting plastic scrap material wherein the plastic scrap is suspended in water and an antifoam agent is added to the suspension which is then passed through a disc refiner or a Valley beater to comminute the plastic scrap. The antifoam agent is selected from defoamers |
