Patents by Inventor Qiang Yu

Qiang Yu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20080090068
    Abstract: This invention provides gypsum wallboards with a unique microstructure where the walls between voids are enhanced in thickness and strength to substantially improve the strength and handling properties of the wallboards. A method of making lightweight gypsum wallboards is also provided.
    Type: Application
    Filed: October 2, 2007
    Publication date: April 17, 2008
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventor: Qiang Yu
  • Publication number: 20080069762
    Abstract: A process is disclosed for making a blend of alpha- and beta-stucco including a slurry calcination step to produce alpha calcium sulfate hemihydrate followed by a fluidized bed calcination step to produce beta calcium sulfate hemihydrate. The process starts with 50-75% gypsum-containing solids slurry, and then steam calcines the slurry in a first reactor to form partially calcined gypsum slurry which contains calcium sulfate dihydrate and alpha calcium sulfate hemihydrate. The partially calcined slurry is then dewatered. Then the filter cake is fed into a kettle to complete the calcination process by converting the calcium sulfate dihydrate of the filter cake material into beta calcium sulfate hemihydrate.
    Type: Application
    Filed: September 20, 2006
    Publication date: March 20, 2008
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Michael R. LYNN, Weixin David SONG, Qingxia LIU, Qiang YU, Michael L. CLOUD
  • Publication number: 20080070026
    Abstract: The invention generally provides gypsum-containing slurries including stucco, a hydroxyethylated starch, naphthalenesulfonate dispersant, and sodium trimetaphosphate. The naphthalenesulfonate dispersant is present in an amount of about 0.1%-3.0% by weight based on the weight of dry stucco. The hydroxyethylated starch is present in an amount of from about 0.5% by weight to about 10% by weight based on the weight of dry stucco in the formulation. The sodium trimetaphosphate is present in an amount of about 0.1%-0.4% by weight based on the weight of dry stucco. Other slurry additives can include accelerators, binders, paper fiber, glass fiber, and other known ingredients. The invention also comprises the gypsum-containing products made with such slurries, for example, lightweight gypsum wallboard, and a method of making lightweight gypsum wallboard.
    Type: Application
    Filed: October 31, 2007
    Publication date: March 20, 2008
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Qiang Yu, Sharon Tracy
  • Publication number: 20070251628
    Abstract: The invention provides in one embodiment a gypsum-containing slurry including stucco and an aqueous pre-dispersion of a pregelatinized starch. Also provided is a method of making gypsum wallboard by providing a pre-dispersion of the pregelatinized starch in water, and adding the pregelatinized starch pre-dispersion to the gypsum-containing slurry. The pregelatinized starch can have a particle size distribution within the following range: d (0.1)=about 20?-35?, d (0.5)=about 60?-110?, d (0.9)=about 100?-220?.
    Type: Application
    Filed: April 28, 2006
    Publication date: November 1, 2007
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Qiang Yu, Weixin Song
  • Publication number: 20070227405
    Abstract: 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 condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material.
    Type: Application
    Filed: June 11, 2007
    Publication date: October 4, 2007
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Qiang YU, Steven SUCECH, Brent GROZA, Raymond MLINAC, Frederick JONES, Paul HENKELS
  • Patent number: 7244304
    Abstract: A method for producing a set gypsum-containing product comprising an interlocking matrix of set gypsum wherein said method comprises applying to said set gypsum one or more enhancing materials selected from the group consisting of phosphoric acid; condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units, and monobasic salts or monovalent ions of orthophosphates.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: July 17, 2007
    Assignee: United States Gypsum Company
    Inventors: Qiang Yu, Steven W Sucech, Brent E. Groza, Raymond J. Mlinac, Frederick T. Jones, Paul J. Henkels
  • Publication number: 20070129426
    Abstract: The present invention relates to the coumestans compounds extracted from Compositae plants, drug compositions or health products comprising the compounds and the use in treatment of rheumatic arthritis or rheumatoid arthritis, osteoarthritis. The animal experiments in vivo or in vitro indicate that the coumestans compounds can effectively treat and alleviate symptoms of rheumatic arthritis or rheumatoid arthritis, and osteoarthritis.
    Type: Application
    Filed: December 27, 2004
    Publication date: June 7, 2007
    Applicant: Shanghai Ambrosia Pharmaceutical Co., Ltd.
    Inventor: Qiang YU
  • Publication number: 20070059513
    Abstract: The invention generally provides a light weight composite gypsum board including a foamed low density set gypsum core, a top non-foamed (or reduced-foamed) bonding high density layer and a bottom non-foamed (or reduced-foamed) bonding high density layer, a top cover sheet bonded to the foamed low density set gypsum core by the top non-foamed (or reduced-foamed) bonding high density layer, and a bottom cover sheet bonded to the foamed low density set gypsum core by the bottom non-foamed (or reduced-foamed) bonding high density layer. The foamed low density set gypsum core and the non-foamed (or reduced-foamed) bonding high density layers are made from a gypsum slurry including stucco, pregelatinized starch present in an amount of about 0.5-10% by weight based on the weight of stucco, preferably a naphthalenesulfonate disperant present in an amount of about 0.1-3.0% by weight based on the weight of stucco, and preferably sodium trimetaphosphate present in an amount of about 0.12-0.
    Type: Application
    Filed: September 29, 2006
    Publication date: March 15, 2007
    Applicant: United States Gypsum Company
    Inventors: Qiang Yu, Weixin Song
  • Publication number: 20070048549
    Abstract: The invention provides gypsum wallboard, made from gypsum-containing slurries having outstanding hydration rate characteristics comprising alpha-hemihydrate ground to a particular particle size distribution range and having a Blaine surface area in the range from about 3100 cm2/g to about 9000 cm2/g, alone or in combination with beta-hemihydrate.
    Type: Application
    Filed: August 26, 2005
    Publication date: March 1, 2007
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Weixin Song, Qiang Yu, Qiangxia Liu
  • Publication number: 20070048490
    Abstract: This invention provides low dust low density gypsum wallboard products having high total core void volumes, corresponding to low densities in the range of about 10 to 30 pcf. The wallboards have a set gypsum core formed between two substantially parallel cover sheets, the set gypsum core preferably having a total void volume from about 80% to about 92%, and made from a slurry including stucco, pregelatinized starch, and a naphthalenesulfonate dispersant. The combination of the pregelatinized starch and the naphthalenesulfonate dispersant also provides a glue-like effect in binding the set gypsum crystals together. The wallboard formulation, along with small air bubble voids (and water voids) provides dust control during cutting, sawing, routing, snapping, nailing or screwing down, or drilling of the gypsum-containing products.
    Type: Application
    Filed: November 2, 2006
    Publication date: March 1, 2007
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Qiang Yu, Weixin Song
  • Publication number: 20070022913
    Abstract: Polymerization of siloxane is improved using a gypsum-based slurry that includes stucco, Class C fly ash, magnesium oxide and an emulsion of siloxane and water. This slurry is used in a method of making water-resistant gypsum articles that includes making an emulsion of siloxane and water, then combining the slurry with a dry mixture of stucco, magnesium oxide and Class C fly ash. The slurry is then shaped as desired and the stucco is allowed to set and the siloxane polymerizes. The resulting product is useful for making a water-resistant gypsum panel having a core that includes interwoven matrices of calcium sulfate dihydrate crystals and a silicone resin, where the interwoven matrices have dispersed throughout them a catalyst comprising magnesium oxide and components from a Class C fly ash.
    Type: Application
    Filed: July 29, 2005
    Publication date: February 1, 2007
    Inventors: Xuming Wang, Qingxia Liu, Paul Reed, Qiang Yu
  • Publication number: 20060278133
    Abstract: The invention generally provides gypsum-containing slurries including stucco, naphthalenesulfonate dispersant, and pregelatinized starch. The naphthalenesulfonate dispersant is present in an amount of about 0.1%-3.0% by weight based on the weight of dry stucco. The pregelatinized starch is present in an amount of at least about 0.5% by weight up to about 10% by weight of pregelatinized starch by weight based on the weight of dry stucco in the formulation. Other slurry additives can include trimetaphosphate salts, accelerators, binders, paper fiber, glass fiber, and other known ingredients. The invention also comprises the gypsum-containing products made with such slurries, for example, gypsum wallboard, and a method of making gypsum wallboard.
    Type: Application
    Filed: June 7, 2006
    Publication date: December 14, 2006
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Qiang Yu, Weixin Song, Michael Lynn
  • Publication number: 20060278132
    Abstract: The invention generally provides gypsum-containing slurries including stucco, trimetaphosphate salt, and naphthalenesulfonate dispersant, wherein the trimetaphosphate salt is present in an amount of at least about 0.12% by weight based on the weight of stucco. Other slurry additives can include accelerators, binders, starch, and paper fiber, glass fiber, and other known ingredients. The invention also comprises the gypsum-containing products made with such slurries, for example, gypsum wallboard, and a method of making gypsum wallboard.
    Type: Application
    Filed: June 2, 2006
    Publication date: December 14, 2006
    Applicant: UNITED STATES GYPSUM COMPANY
    Inventors: Qiang Yu, Michael Lynn, Weixin Song, Qingxia Liu, Michael Shake, Frederick Jones
  • Publication number: 20060243171
    Abstract: A wet gypsum accelerator comprising ground product having a median particle size of from about 0.5 micron to about 2 microns and 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 are a method of preparing a wet gypsum accelerator, a method of hydrating calcined gypsum to form an interlocking matrix of set gypsum, a set gypsum-containing composition, and a set gypsum-containing product.
    Type: Application
    Filed: April 27, 2005
    Publication date: November 2, 2006
    Applicant: United States Gypsum Company
    Inventors: Qiang Yu, Stewart Hinshaw, Michael Streeter, W. Song, Michael Bolind, Robert Price
  • Publication number: 20050019618
    Abstract: A method for producing a set gypsum-containing product comprising an interlocking matrix of set gypsum wherein said method comprises applying to said set gypsum one or more enhancing materials selected from the group consisting of phosphoric acid; condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units, and monobasic salts or monovalent ions of orthophosphates.
    Type: Application
    Filed: August 18, 2004
    Publication date: January 27, 2005
    Applicant: United States Gypsum Company
    Inventors: Qiang Yu, Steven Sucech, Brent Groza, Raymond Mlinac, Frederick Jones, Paul Henkels
  • Patent number: 6822033
    Abstract: A composition and method for treating a set gypsum-containing material are disclosed. The composition is formed from at least water at least one trimetaphosphate salt, at least one monobasic phosphate salt, and at least one acyclic polyphosphate salt having at least three phosphate units. The method comprises applying to a set gypsum material at least two of the following inorganic phosphates: at least one monobasic phosphate salt, at least one trimetaphosphate salt, and at least one acyclic polyphosphate salt having at least three phosphate units. The method can be for inhibiting re-calcination of a set gypsum containing material, and/or for enhancing the strength, surface hardness, paintability, abrasion resistance, and/or water erosion resistance of a set gypsum-containing material. Also disclosed is a method of making a set gypsum-containing material.
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: November 23, 2004
    Assignee: United States Gypsum Company
    Inventors: Qiang Yu, Qingxia Liu, Jeffrey F. Grussing, Kevin W. Moyer, Richard Spencer
  • Patent number: 6815049
    Abstract: A composition including, but not limited to, a mixture of a calcium sulfate material, water, and a tetrametaphosphate compound is disclosed. Desirably, the inclusion of the tetrametaphosphate compound (e.g., salt or ion) in a pre-set treatment of a calcium sulfate material enhances the resistance to permanent deformation (e.g., sag), dimensional stability, and/or compressive strength of the composition while also preferably avoiding any significant retardive effect on the rate of hydration of calcined gypsum to calcium sulfate dihydrate. A set gypsum-containing product and a method for producing a set gypsum-containing product having increased resistance to permanent deformation are also disclosed.
    Type: Grant
    Filed: December 11, 2001
    Date of Patent: November 9, 2004
    Assignee: United States Gypsum Company
    Inventors: Srinivas Veeramasuneni, Qiang Yu, William A. Frank
  • Patent number: 6805741
    Abstract: 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 as a set preventer comprising a polyacrylic acid and/or a salt thereof. The composition has a viscosity of from about 5,000 centipoise to about 48,000 centipoise. Also disclosed is a kit that comprises separately packaged components. One of the components is a composition comprising calcined gypsum and a polyacrylic acid and/or a salt thereof, and, optionally, water. Another component of the kit comprises an activator which, when mixed with the composition, permits the composition to set.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: October 19, 2004
    Assignee: United States Gypsum Company
    Inventors: Qingxia Liu, Kumar Natesaiyer, Qiang Yu
  • Patent number: 6800131
    Abstract: 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 condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: October 5, 2004
    Assignee: United States Gypsum Company
    Inventors: Qiang Yu, Steven W. Sucech, Brent E. Groza, Raymond J. Mlinac, Frederick T. Jones, Paul J. Henkels
  • Publication number: 20040187741
    Abstract: 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 as a set preventer comprising a polyacrylic acid and/or a salt thereof. The composition has a viscosity of from about 5,000 centipoise to about 48,000 centipoise. Also disclosed is a kit that comprises separately packaged components. One of the components is a composition comprising calcined gypsum and a polyacrylic acid and/or a salt thereof, and, optionally, water. Another component of the kit comprises an activator which, when mixed with the composition, permits the composition to set.
    Type: Application
    Filed: March 27, 2003
    Publication date: September 30, 2004
    Applicant: United States Gypsum Company
    Inventors: Qingxia Liu, Kumar Natesaiyer, Qiang Yu