us patent of process gypsum

US Patent for Process and device for stabilising, cooling ...

2011-8-10 · The present invention relates to a process for the continuous conditioning of gypsum plaster. Gypsum is a technical, mineralogical term for the chemical compound calcium sulphate dihydrate (CaSO 4.2H 2 O). By supplying it with thermal energy, gypsum loses 1½ molecules of its chemically bound water of crystallisation per formula unit; the calcium sulphate dihydrate is converted into calcium ...

us patent of process gypsum

United States v United States Gypsum Co was a patent–antitrust case in which the United In 1912 United States Gypsum acquired a patent covering both process and product claims on gypsum board with closed edges the paper liner

US4238445A - Process for manufacturing gypsum board ...

A process and apparatus for producing a healed stucco having lowered water demand without loss of normal strength development potential which comprises, while blending a small amount of water with the calcined gypsum, simultaneously or substantially simultaneously grinding the calcined gypsum so as to increase the surface area of the calcined gypsum particles while incorporating about 1-10% by ...

Patents Assigned to National Gypsum Company - Justia ...

2016-10-17 · Justia - Patents - Patents and Patent Application Resources. Abstract: A process for the formation of highly durable cementitious board using lightweight aggregate is disclosed. The process comprises pouring a core mix onto a conveyor, wherein the core mix is comprised of one or more lightweight aggregate filler in the amount of 0.5 to 5 weight percent of the core mix, one or more

Patents Assigned to USG Corporation - Justia Patents Search

1998-1-9 · Abstract: This invention is a process and foaming system for producing foamed gypsum board which permits the production and control of large foam voids in the gypsum core by adjusting the ratio of a first foaming agent and a second foaming agent. My process includes the steps of preforming a first foaming agent which forms stable foam voids in a gypsum slurry and independently preforming a ...

Process for the production of gypsum-based composite ...

1998-8-7 · 19. The process of claim 1, wherein the calcium sulfate dihydrate is a dihydrate sieve fraction below 0.05 mm. 20. The process of claim 1, wherein the calcium sulfate dehydrate is selected from the group consisting of waste-gas gypsum, phosphorogypsum, gypsum mould flour of ceramic industry and mixtures thereof.

US Patent for Synthetic gypsum fertilizer product and ...

2013-8-8 · Embodiments of the invention are directed to pelletized synthetic gypsum and methods and systems for producing pelletized synthetic gypsum. Synthetic gypsum is combined with a binder composition and pelletized to a desired size. The binder composition may include lignosulfonate. Additives may be included in the pellets such as various plant nutrients and micro-nutrients.

Patents Assigned to National Gypsum Properties - Justia ...

2016-10-17 · Abstract: A slurry for manufacturing gypsum board is disclosed. The slurry comprises calcined gypsum, water, a foaming agent, and a thickening agent. The thickening agent of the present disclosure acts to improve the cohesiveness of the slurry without adversely affecting the setting time of the slurry, the paper-to-core bond (wet and dry), or the head of the slurry by acting as a defoaming ...

Process for preparing calcined gypsum and gypsum board ...

A process for preparing calcined gypsum (stucco) which comprises treating a mass of calcined gypsum by adding, with thorough blending, small portions of an aqueous solution of ligno sulfonate; allowing the treated stucco to heal; and optionally drying the healed stucco and

Process of making anhydrous calcium sulphate - UNITED ...

Process of making anhydrous calcium sulphate - UNITED STATES GYPSUM CO. Title: Process of making anhydrous calcium sulphate. United States Patent 2418590. Abstract: The present invention relates to a process of making a new form of insoluble calcium sulfate anhydrite, characterized by very fine crystal size, high plasticity, high water carrying ...

us patent of process gypsum

United States v United States Gypsum Co was a patent–antitrust case in which the United In 1912 United States Gypsum acquired a patent covering both process and product claims on gypsum board with closed edges the paper liner

US3929416A - Process and apparatus for producing

When limestone is reacted with sulfuric acid to produce gypsum, the limestone and sulfuric acid, which are continuously fed to a reactor, are moved through the reactor and a discharger while rotating reactants and products in course of a gypsum-forming process. Gypsum lumps are continuously obtained as a

US1372861A - Process and method of molding gypsum

US1372861A US34484019A US1372861A US 1372861 A US1372861 A US 1372861A US 34484019 A US34484019 A US 34484019A US 1372861 A US1372861 A US 1372861A Authority US United States Prior art keywords mold gypsum block core blocks Prior art date 1919-12-15 Legal status (The legal status is an assumption and is not a legal conclusion.

Process monitor for gypsum board manufacturing - Patent ...

Contact us; Contact us. ... Recent Activity Export List Clipboard Export Process monitor for gypsum board manufacturing (PAT - US6045730) ' ' POTTER JOSEPH T Patent: United STATES Patent - United States. Application: US19980025315 on 1998-02-18. Publication: 2000-04-04. Abstract. The temperature and/or moisture profile over time of gypsum ...

Manufacturing Process And Products Of Synthetic Gypsum ...

This is a US nonprovisional application of the US provisional patent application, Ser. No. 62/279,576, filed on Jan. 15, 2016. The entire disclosure of the above-referenced provisional application is incorporated by reference herein. BACKGROUND. Gypsum has long been used as a

Process for preparing calcined gypsum and gypsum board ...

A process for preparing calcined gypsum (stucco) which comprises treating a mass of calcined gypsum by adding, with thorough blending, small portions of an aqueous solution of ligno sulfonate; allowing the treated stucco to heal; and optionally drying the healed stucco and

Process for waterproofing gypsum materials - Patent ...

1996-2-22 · The invention provides a process for water-proofing gypsum materials which comprises adding, to a pulverulent gypsum plaster composition containing from 10 to 90% by weight of gypsum based on the total weight of the composition, a mixture of a) from 1.0 to 15% by weight, based on the total weight of the composition, of one or more dispersion powders redispersible in water and based

US3415910A - Calcined gypsum and a method for its ...

US3415910A US608483A US60848367A US3415910A US 3415910 A US3415910 A US 3415910A US 608483 A US608483 A US 608483A US 60848367 A US60848367 A US 60848367A US 3415910 A US3415910 A US 3415910A Authority US United States Prior art keywords water stucco hemihydrate kettle temperature Prior art date 1967-01-11 Legal status (The legal status is an assumption and is

Retarder for gypsum plaster and a process for retarding ...

A process for retarding the setting of a gypsum plaster composition which comprises incorporating in said gypsum plaster composition an effective amount of a retarder selected from the group consisting of β-hydroxy-β-carboxy-isocaproic acid and a water soluble salt thereof.

Process for recovering terephthalic acid from waste ...

2020-10-13 · United States Patent [i9] Lamparter et al. [11] Patent Number: 4, 542,239 [45] Date of Patent: Sep. 17, 1985 [54] PROCESS FOR RECOVERING TEREPHTHALIC ACID FROM WASTE

Process monitor for gypsum board manufacturing - Patent ...

Contact us; Contact us. ... Recent Activity Export List Clipboard Export Process monitor for gypsum board manufacturing (PAT - US6045730) ' ' POTTER JOSEPH T Patent: United STATES Patent - United States. Application: US19980025315 on 1998-02-18. Publication: 2000-04-04. Abstract. The temperature and/or moisture profile over time of gypsum ...

Process for waterproofing gypsum materials - Patent ...

1996-2-22 · The invention provides a process for water-proofing gypsum materials which comprises adding, to a pulverulent gypsum plaster composition containing from 10 to 90% by weight of gypsum based on the total weight of the composition, a mixture of a) from 1.0 to 15% by weight, based on the total weight of the composition, of one or more dispersion powders redispersible in water and based

United States v. United States Gypsum Co. :: 333 U.S. 364 ...

a patent shall have been granted or issued for or upon any of the said Roos or Bayer inventions and/or applications any of said plasterboard or gypsum wallboard manufactured by Licensee, the body or core of which is made according to the process set forth and claimed in any patent granted for or upon any of said Roos or Bayer inventions and/or ...

Process for the degradation of waste gypsum and

In a process for the degradation of waste gypsum, with simultaneous production of calcium hydroxide, the gypsum is made up to give a suspension for the biological degradation, the suspension is furnished with substrate and inoculated with sulphate-degrading bacteria.

Process for the prodcution of Defecation gypsum for ...

2009-6-18 · A process for the preparation of Defecation Gypsum having high agronomic interest due to its high content of organic substances, such as amino-acids and peptides, practically free from pathogenic substances and its different formulations from biological sludges and/or from other waste materials are described.

(PDF) Capture and storage of CO2 into waste

the gypsum process where calcium sulphate is reacted with. ... Robinson P (1953) US Patent 2631084A. Savci S (2012) An agricultural pollutant chemical fertilizer. ... (articles and patents) from ...

(PDF) Lightweight Gypsum Based Materials: Methods of ...

Patent US 4153470, 1979. [20] Saito, M., Hirai, E ... In the design process, lightweight gypsum composites are considered as multi-functional materials which are supposed to have both load bearing ...

Process for recovering terephthalic acid from waste ...

2020-10-13 · United States Patent [i9] Lamparter et al. [11] Patent Number: 4, 542,239 [45] Date of Patent: Sep. 17, 1985 [54] PROCESS FOR RECOVERING TEREPHTHALIC ACID FROM WASTE

Process and apparatus for calcination of gypsum - Cement ...

2016-11-18 · Process and apparatus for calcination of gypsum. (22) 18.11.2016. (43) 24.05.2018. (57) The invention pertains to a process for modifying gypsum, wherein a continuous feed of raw gypsum is provided; the water content of the raw gypsum is

α-calcium sulfate hemihydrate preparation from FGD

2011-10-15 · The process of the dissolution of FGD gypsum and the crystallization of α-HH probably purifies the product. ... U. Jurgen, Process for the conversion of calcium sulfate dihydrate into α-hemihydrate, US Patent 1993 US5248487. Google Scholar. D.W. Kirk, S. Tong, Process for the production of α-hemihydrate calcium sulfate from flue gas ...