Assignee: National Gypsum Company

Location: Charlotte, NC
No. of patents: 35

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Number	Title	Issue Date
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
6200380	Method for continuous production for wallboard tape joint compound A method of continuously producing a cementitious composition such as joint compound includes pre-mixing at least two dry ingredients and pre-mixing at least two liquid ingredients. The ingredients are provided in a continuous mixing apparatus and at leas...	03/13/2001
6187409	Cementitious panel with reinforced edges A cementitious panel comprising a cementitious core which is fabric-reinforced at the surface thereof and whose longitudinal edges are reinforced by a network of fibers. A panel may be obtained wherein the surface edge reinforcement layers are relatively ...	02/13/2001
6061995	Composite structural member and wall assembly method This disclosure relates to a composite structural member comprising a body part and multiple rigid strips which are attached to and separated by the body part. The body part is formed by a core having substantially flat parallel sides and opposed edges, a...	05/16/2000
5879486	Methods of manufacturing gypsum board and board made therefrom Apparatus and method for producing gypsum board, comprising apparatus for coating a cover sheet with a relatively high density gypsum slurry, apparatus for forming edge borders on the sheet with relatively high density gypsum slurry, and apparatus for for...	03/09/1999
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
5879825	Gypsum wallboard and method of making same A method of preparation and use of high-strength 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 a strengthening agent. The...	03/09/1999
5858083	Cementitious gypsum-containing binders and compositions and materials made therefrom Cementitious binders include calcium sulfate beta-hemihydrate, a cement component comprising Portland cement, and either silica fume or rice-husk ash. The silica fume or rice-husk ash component is at least about 92 wt % amorphous silica and has an alumina...	01/12/1999
5779786	Ready mixed setting-type joint compound, and method of making same A process for the production of a ready-mixed setting-type joint compound includes the use of calcium sulfate hemihydrate, water, and a set-retarding agent. The retarder includes a polymer composition including acrylic acid and acrylamide monomer units, f...	07/14/1998
5749192	Corner clips for horizonal framing A hollow shaft wall corner with each of two walls having alternating horizontal studs and horizontally extending core boards, with the horizontal studs of the two respective walls adjoined at the wall corner by small clips affixed to the horizontal studs....	05/12/1998
5740644	Wall with horizontal metal stud and reinforcement channel therefor This disclosure relates to a reinforced metal stud for use in a hollow wall. The wall includes sheet metal studs placed horizontally between adjacent, horizontally extending gypsum core boards, typically in the walls surrounding an elevator shaft and stai...	04/21/1998
5729945	Wall structure and method of securing framing members to wallboards with an adhesive This disclosure relates to a wall construction including an outer panel and an inner panel, the inner panel being formed by at least one wallboard. The outer and inner panels are substantially parallel and are spaced apart to form an interior space betwee...	03/24/1998
5724784	Shaft wall and horizontal metal stud therefor A hollow shaft wall with horizontal studs having angled stud webs forming a channel with the stud inner flanges. Core boards are held by one edge in the angled channel and the other edge held by suitable means on an adjacent horizontal stud. Wallboards ar...	03/10/1998
5722626	Reusable riser This disclosure relates to a riser comprising an elongated web having one or more folds which form at least one ridge and slopes extending away from the ridge. When in use as a riser, the web is positioned on edge so that the edge surfaces of the ridges a...	03/03/1998
5718759	Cementitious gypsum-containing compositions and materials made therefrom A cementitious composition useful for water-resistant construction materials, including floor underlayments, backing boards, self-leveling floor materials, road patching materials, fiberboard, fire-proofing sprays, and fire-stopping materials includes abo...	02/17/1998
5718797	Apparatus for manufacturing gypsum board Apparatus and method for producing gypsum board, comprising apparatus for coating a cover sheet with a relatively high density gypsum slurry, apparatus for forming edge borders on the sheet with relatively high density gypsum slurry, and apparatus for for...	02/17/1998
5685903	Cementitious gypsum-containing compositions and materials made therefrom A cementitious composition useful for water-resistant construction materials, including floor underlayments, backing boards, self-leveling floor materials, road patching materials, fiberboard, fire-proofing sprays, and fire-stopping materials includes abo...	11/11/1997
5661881	Method of making framing components of expanded metal An elongated metal structural member including an expanded metal web formed by severing a metal strip along a sinuous path forming a plurality of keystone-shaped tabs on each half, moving the two halves directly away from each other until outer corners of...	09/02/1997
5653797	Ready mixed setting-type joint compound and method of making same A process for the production of a ready-mixed setting-type joint compound includes the use of calcium sulfate hemihydrate, water, and a set-retarding agent. The retarder includes a polymer composition including acrylic acid and acrylamide monomer units, f...	08/05/1997
5644883	Multiple use corner clip A hollow shaft wall stud corner clip adjoins ends of horizontal studs at a shaft wall structure corner and is readily adaptable for supporting core boards in a fire rated ceiling or a fire rated duct and for holding core board in place at a top or a botto...	07/08/1997
5575131	Multiple use corner clip A hollow shaft wall stud corner clip adjoins ends of horizontal studs at a shaft wall structure corner and is readily adaptable for supporting core boards in a fire rated ceiling or a fire rated duct and for holding core board in place at a top or a botto...	11/19/1996
5573333	Demand responsive, continuous preparation of starch slurry for use in manufacturing gypsum products A system for delivering a proper proportion of water and starch to form a slurry on a continuous basis responsive to the rate required for the production of gypsum board has a water input controller and a starch input controller to control the rate of wat...	11/12/1996
5524410	Framing components of expanded metal, and method of making such components An elongated metal structural member including an expanded metal web formed by severing a metal strip along a sinuous path forming a plurality of keystone-shaped tabs on each half, moving the two halves directly away from each other until outer corners of...	06/11/1996
5485706	Offset forming of structural components A laterally stiffened, elongate, roll-formed metal stud, or equivalent structural member having a central web with alternating deformed and undeformed portions....	01/23/1996
5483777	Utility box mounting plate and Z-stud A generally flat attachment plate for providing a mounting surface on a side of a Z-stud, which surface is perpendicular to the Z-stud flanges. The plate has tongues on one edge engaging an inwardly directed lip on the Z-stud flange, and means on the oppo...	01/16/1996
5475961	Vertical post assembly A hollow shaft wall with horizontal studs held between corner posts and an intermediate vertical wall support post, which intermediate post has a central reinforcement channel, the reinforcement channel has a bottom and two side walls, the channel is fill...	12/19/1995
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
5464302	Extendible interconnected C-studs An extendible stud, consisting of two substantially identical C-studs each of which has opposed flanges of substantially different widths and inwardly turned lips at the flange outer edges, and each C-stud having an elongate central area in its web locate...	11/07/1995
5425212	Folding track A foldable floor track or ceiling track having 1/8-inch-wide slots in the flanges and a 1/8-inch-high rib in the web, between the slots, permitting the track to be cleanly folded in half at the factory, for convenient packaging and handling, and then unfo...	06/20/1995
5390458	Wallboard protective edge tape for mounting board A wallboard package having edge protective tape which connects two wallboards face-to-face, with an adhesive film on the tape inner surface adapted for use in affixing the wallboards to wall studs....	02/21/1995
5383317	Shaft wall cavity extension A hollow shaft wall having a cavity of a first width substantially throughout said wall and a cavity of a greater width in a limited section for the reception of a relatively deep utility box, the limited section having board omitted on one side thereof, ...	01/24/1995
5361556	Horizontal unitized panel Horizontal panels, each consisting of top and bottom horizontal studs, with gypsum boards affixed therebetween, are stacked vertically, with suitable means for maintaining the wall vertical....	11/08/1994
5353561	Area separation wall and stud therefor An area separation wall having modified H-studs with a web which includes a center portion perpendicular to the modified H-stud flanges and two side portions which are adjoined to the flanges at an angle of about 60°. Gypsum core boards with beveled edge...	10/11/1994
5345739	Wallboard attachment Edge protective tape, on a package consisting of two predecorated wallboards, partially adhered to the wallboard back faces, forms pockets in non-adhered areas, into which wallboard mounting clips can be inserted....	09/13/1994
5298173	Method of neutralizing acidified surface water Blocks, weighing about 35 lbs., formed of a homogeneous mixture of about 75% gypsum and 25% lime, are strategically placed in surface water that is being damaged by acid rain, where, by timed release of lime, the pH of the water is maintained at about 6.5...	03/29/1994

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Assignee: National Gypsum Company