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United States Gypsum Company Patents
Assignee:
United States Gypsum Company
Address:
Chicago, IL
No. of patents:
442
Patents:


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Patent Number Title Of Patent Date Issued
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
5147403 Prosthesis implantation method September 15, 1992
A technique for implanting a prosthesis is provided. According to the technique a prosthesis is implanted in a host bone by preparing the surface of the host bone to receive the prosthesis, applying calcium sulfate in free-flowing form to the receiving surface of the host bone, and s
5106600 Process for producing tabular acicular gypsum crystals April 21, 1992
A process for economically producing tabular acicular gypsum crystals in a continuously stirred reactor is disclosed. The process involves establishing a steady state atmospheric pressure reaction zone of about 20% to about 25% by weight solids of gypsum crystals in water at a temper
5011668 Calcination apparatus April 30, 1991
In a method and apparatus for calcining calcium sulphate dihydrate or like heat sensitive material, in which a bed of the material is heated in a vessel (41) by the direct introduction of a hot gas through a tube (21) extending downwardly into the bed, the proportion of insoluble anhydri
4959272 Gypsum wallboard paper having imitation manila colored coating September 25, 1990
A paper cover sheet particularly designed for use as the face sheet in the manufacture of gypsum wallboard, the face sheet having a base formed of a plurality of filler plies formed of recycled paper comprised of clean hard stocks such as kraft and boxboard cuttings, and being free of to
4916004 Cement board having reinforced edges April 10, 1990
A cement board having bare surfaces and a 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 cement
4915936 Dental hygiene composition for reducing periodontal disease April 10, 1990
Gingivitis and related periodontal problems of the gingival tissues may be treated with a dental hygiene composition comprising an effective amount of a calcium sulfate compound such as calcium sulfate hemihydrate. Preferred compositions comprise mouthwashes and oral rinses containing
4915623 Calcination apparatus April 10, 1990
The invention concerns an improved method of calcining gypsum in which non-reactive hot gas is passed into contact with the gypsum from a source through a plurality of tubes extending downwardly into the gypsum. The invention also contemplates an improved apparatus which comprises a
4853085 Neutral sized paper for use in the production of gypsum wallboard August 1, 1989
A paper particularly adapted for use as cover sheets in the production of gypsum wallboard, the paper having improved porosity and strength to permit better drainage and more rapid drying in the production of the paper to permit less fiber to be utilized, and to permit less heat to be
4849193 Process of preparing hydroxylapatite July 18, 1989
This invention relates to the manufacture of hydroxylapatite in a through-solution process wherein monobasic calcium phosphate is reacted with a calcium hydroxide solution. In a preferred embodiment, an acidic premix is formed by reacting phosphoric acid and calcium hydroxide with hi
4820754 Drywall coating composition April 11, 1989
The unequal porosity and different textures of a drywall reinforced with joint tape and joint compound are concealed by a paint made from a low cost, easily dispersible powder in which the pigment volume concentration is about 70% to about 75%. A vinyl acetate/ethylene copolymer serves a
4801355 Tabular acicular gypsum and method of filling paper January 31, 1989
A tabular variety of acicular gypsum crystal filler is prepared by hydrating calcium sulfate dihydrate particles in a seeded continuously stirred reactor at a low level of super-saturation to obtain crystals having an aspect ratio of about 100:10:1 and average length in the longest d
4752538 Method for forming a lightweight cementitious structural product and a product formed thereby June 21, 1988
A method for producing a lightweight set cementitious product having excellent strength by forming a aqueous cementitious slurry, incorporating therein expandable polystyrene beads which are less than completely expanded, and heating the slurry to drive off excess water, to cause a c
4750307 Wall construction and resilient runner therefor June 14, 1988
A buckle-resistant resilient runner having a thickness of from 0.017 to 0.020 inch is interposed between the framework and the wall-board of a partition having a sound transmission coefficient of 53. A scalloped web connects the wallboard support flange and the flange of the runner which
4744963 Highly efficient calcination of gypsum to hemihydrate May 17, 1988
Hydrodynamic pumping of the fluidized calcining mass in a kettle is set up by the continuous flow of the mass to and from heating rods immersed therein which are constantly emitting at least about 1 British Thermal Unit of heat per minute per square inch of the surface of the rods. The
4744961 Submerged combustion calcination May 17, 1988
Gypsum is calcined by contacting it with the hot gases spewing out of a combustion tube submerged in the mass of gypsum. The formation of dead-burned anhydrite is reduced by surrounding the combustion tube with a second tube called a draft tube. Gypsum passing through the annulus bet
4743475 Drywall coating composition May 10, 1988
The unequal porosity and different textures of a drywall reinforced with joint tape and joint compound are concealed by a paint made from a low cost, easily dispersible powder in which the pigment volume concentration is about 70% to about 75%. A vinyl acetate/ethylene copolymer serves a
4704838 Rounded corner ceiling runner system November 10, 1987
A generally L-shaped coupling plate having an arcuate mandrel at the junction of two generally rectangular tongues is united with a notched out channel by inserting the first tongue into slots defined by the web of the channel and opposed ribs spaced apart from and parallel to the web,
4686253 Lightweight joint compound having improved paintability August 11, 1987
Expanded perlite coated with a composition to render the perlite impervious to water, and a joint compound incorporating the same. The perlite is ground prior to expansion to provide subsequently expanded perlite having a mean particle size from about from about 50 to about 70 microns, t
4672785 Modified runner and area separation wall structure utilizing runner June 16, 1987
An integral generally channel-form runner for securing and supporting one or more wallboard panels in a demountable structure, the runner having an integral support for the lower edges of the wallboard panels in a position spaced above the bottom of the runner to prevent absorption of wa
4661161 Ready-mixed, setting-type cementitious composition having separately packaged accelerator April 28, 1987
A setting-type cementitious composition useful for a variety of applications, including, in a preferred embodiment, a joint compound for finishing joints between adjacent gypsum wallboards, comprising a first or cementitious component in pre-mixed form comprising an aqueous slurry of
4655950 Foamed cast acoustical material and method April 7, 1987
A lightweight cast acoustical material requiring less drying time and energy is obtained by lightly cooking an aqueous slurry of starch, cooling it to about less than 140.degree. F., whipping air into it, adding granulated mineral wool with thorough mixing to form a foam, casting the
4647486 Fire resistant gypsum board . . . anhydrite March 3, 1987
Increased fire resistant gypsum board core formulations and plaster fireproofing formulations are provided by incorporating calcium sulfate anhydrite into the formulations. Particularly fire resistant effects are achieved with a fibrous form of calcium sulfate anhydrite, and with blends
4638606 Decorative trim system for partition adapted to support a cantilevered load January 27, 1987
The outside corners of hollow partitions comprising kerfed-edge wallboards supported by kerf-engaging studs having a bifurcated web open to the frontal insertion of a slotted standard from which furniture may be suspended are supported by a corner stud fastened to the bifurcated stud.
4634498 Method for the production of high density fiberboard January 6, 1987
High strength and high density wood fiberboard is formed by treating the wood fiber source material with a highly alkaline solution, such as sodium hydroxide solution, before interfelting the fibers into a loose mat. The wood source material may be treated after refining the material int
4626199 Submerged combustion calcination December 2, 1986
Gypsum is calcined by contacting it with the hot gases spewing out of a combustion tube submerged in the mass of gypsum. The formation of dead-burned anhydrite is reduced by surrounding the combustion tube with a second tube called a draft tube. Gypsum passing through the annulus bet
4621473 Field attachment clip for wall panels November 11, 1986
An integral clip for attaching wall panels to metal studs having flanges in engagement with the occluded surfaces of the wall panels, the clip comprising impaling points adapted to be driven into the occluded surface of the panel for securing the clip to the panel, the clip also having
4621471 Base trim system for partition corners November 11, 1986
A base trim system for partition corners comprises a base trim and a mounting bracket for the base trim. The base trim piece for the corner of intersecting walls has two upright wings angularly joined at a first edge of each, a recessed flange joined to the opposite edge of each wing, an
4621470 Runner and area separation wall structure utilizing runner November 11, 1986
An integral generally channel-form runner for securing and supporting one or more wallboard panels in a demountable structure, the runner having an integral platform for supporting the lower edges of the wallboard panels in a position spaced above the bottom of the runner to prevent abso
4616461 Wall panel attachment hook October 14, 1986
A wall panel such as gypsum board or cement board is attached to a stud disposed between the ends of a panel by a wire hook. The hook has an arcuate talon which is pushed into the core of the panel and a shank portion which is fastened to the web of the stud. A portion of the talon l
4608801 Floor bracing member for a ceramic tile floor September 2, 1986
Light steel joists may be spaced 24 inches o.c. under ceramic tile floors when floor bracing members are spaced at 16 inch o.c. intervals between the joists under such floors. Also made of light gauge steel, the bracing member is slotted to receive a return flange of a channel-shaped joi
4606162 Adjustable glazed partition system August 19, 1986
A glazed partition system adaptable to various angles of intersection comprises an L-shaped mullion having a socket at its upper end in which two opposed glazing rails are pivotable and an arcuate flange at its lower end which releasably engages one glazing rail and slidably engages the
4587774 System adapted to support a cantilevered load at a partition break May 13, 1986
Hollow wall partitions comprising kerfed-edge wallboards supported by kerf-engaging studs often have doors or windows or other breaks adjacent to such a stud which also has the function of supporting a cantilevered load such as a cabinet. Such studs have a bifurcated web comprising a
4587173 Method for improving adhesion of joint compound to metal cornerbead May 6, 1986
Metal cornerbead for drywall partitions is coated with a water reducible acrylic resin to improve the adhesion of joint compound to it. Aqueous solution of resin may be added to roll-forming lubricant such as hexylene glycol.
4586305 Clip for use with runner and area separation wall structure utilizing clip May 6, 1986
An integral clip for use in combination with a lower channel-form runner for securing and supporting a pair of spaced-apart wallboard panels in a demountable structure, the clip having flanges for engaging and being supported upon the edges of the flanges of the runner, and having a
4584811 Furring bracket for fireproofed beams April 29, 1986
Fireproofing of I-beams in building structures is necessary to prevent the loss of strength in the event of a fire. Gypsum board liners for elevator shafts and the like rest in runners attached to the I-beams. Proper placement of the runners is especially critical in the construction of
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