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Hemihydrate patents

      

This page is updated frequently with new Hemihydrate-related patent applications.




 High strength synthetic bone for bone replacement for increasing ompressive strength and facilitating blood circulation, and manufacturing method therefor patent thumbnailHigh strength synthetic bone for bone replacement for increasing ompressive strength and facilitating blood circulation, and manufacturing method therefor
The present invention relates to a high strength synthetic bone for bone replacement for increasing compressive strength and facilitating blood circulation, and a manufacturing method therefor, and provides the high strength synthetic bone for bone replacement in which calcium sulfate hemihydrate (csh) and nacl, in a particle state, penetrate into the pores of a porous inorganic material such as β-tricalcium phosphate (β-tcp) and a wet treatment is performed on the same such that the csh penetrated into the pores is combined with moisture so as to form a hydrated crystal of calcium sulfate dihydrate (csd) to expand the volume thereof in the pores, thereby preventing the escape of a filler by physical force.. .
Ossein Co., Ltd.


 Quick-drying building material composition based on a mineral hybrid binder patent thumbnailQuick-drying building material composition based on a mineral hybrid binder
A quick-drying gypsum composition, in particular for use as gypsum filling compound and for the production of floor coverings, wherein the gypsum composition contains 20 to 70% of a mixture of calcium aluminate and calcium sulfate hemihydrate and/or anhydrite and/or calcium sulfate dihydrate as hydraulic binders and 30 to 80% by weight of fillers, and wherein the weight ratio of calcium aluminate to calcium sulfate hemihydrate and/or anhydrite and/or calcium sulfate dihydrate binders lies in the range from 1:1 to 1:5. Gypsum compositions of this type are characterized by a particularly beneficial shrinkage behavior, such that stresses and cracks in the dried composition can be avoided.
Sika Technology Ag


 Struvite-k and syngenite composition for use in building materials patent thumbnailStruvite-k and syngenite composition for use in building materials
A composition and process for the manufacture thereof for use in a hybrid building material comprising at least in part syngenite (k2ca(so4)2.h2o) and struvite-k (kmgpo4.6h2o). Specified constituents, including magnesium oxide (mgo), monopotassium phosphate (mkp) and stucco (calcium sulfate hemihydrate) are mixed in predetermined ratios and the reaction proceeds through multiple phases reactions which at times are proceeding simultaneously and in parallel and reaction may even compete with each other for reagents if the struvite-k reaction is not buffered to slow down the reaction rate).
Certainteed Gypsum, Inc.


 Coated building panels and articles containing calcium sulfate hemihydrate patent thumbnailCoated building panels and articles containing calcium sulfate hemihydrate
A method of finishing an interior wall includes the steps of preparing a substrate of building panels comprising gypsum, cement or combinations thereof, said substrate having a surface, followed by applying a coating to the substrate, said coating comprising 1-30% by weight of a latex emulsion binder, 30-80% by weight calcium sulfate hemihydrate, up to about 8% by weight of a set inhibiting agent and 20-60% by weight water.. .
United States Gypsum Company


 Multiphasic bone graft substitute material patent thumbnailMultiphasic bone graft substitute material
The invention provides a particulate composition adapted for forming a bone graft substitute cement upon mixing with an aqueous solution, comprising i) a calcium sulfate hemihydrate powder, wherein the calcium sulfate hemihydrate is present at a concentration of at least about 50 weight percent based on the total weight of the particulate composition; ii) a monocalcium phosphate monohydrate powder; iii) a non-porous β-tricalcium phosphate powder; and iv) a porous β-tricalcium phosphate powder. Bone graft substitute cements made therefrom, a bone graft substitute kit comprising the particulate composition, methods of making and using the particulate composition, and articles made from the bone graft substitute cement are also provided..
Agnovos Healthcare, Llc


 Cementitious patch compositions and methods patent thumbnailCementitious patch compositions and methods
A cementitious hydrating patch composition is provided with improved strength and abrasion resistance. The patch comprises portland cement in the amount from 2% to 10%, calcium sulfate hemihydrate in the amount from 2% to 30%, gypsum in the amount from 0% to 15%, calcium aluminate cement in the amount from 15% to 40%, calcium carbonate in the amount from 0% to 40%, at least one filler in the amount from 1% to 30%; and at least one binder in the amount from 10% to 40%, wherein all amounts are based on dry weight of the composition.
United States Gypsum Company


 Method of curing a gypsum calcination product patent thumbnailMethod of curing a gypsum calcination product
A method of conditioning stucco comprises the steps of supplying a quantity of stucco particles to a reaction vessel, the stucco particles comprising calcium sulphate hemihydrate and/or calcium sulphate anhydrite, as well as calcium sulphate dihydrate; and conditioning the stucco particles at a temperature of at least 100° c. And a humidity of at least 70%.
Saint-gobain Placo Sas


 Multiphasic bone graft substitute patent thumbnailMultiphasic bone graft substitute
The invention provides a particulate composition adapted for forming a bone graft substitute cement upon mixing with an aqueous solution, comprising i) a calcium sulfate hemihydrate powder, wherein the calcium sulfate hemihydrate is present at a concentration of at least about 50 weight percent based on the total weight of the particulate composition; ii) a monocalcium phosphate monohydrate powder; iii) a non-porous β-tricalcium phosphate powder; and iv) a porous β-tricalcium phosphate powder. Bone graft substitute cements made therefrom, a bone graft substitute kit comprising the particulate composition, methods of making and using the particulate composition, and articles made from the bone graft substitute cement are also provided..
Wright Medical Technology, Inc.


 Crystalline form of pemirolast patent thumbnailCrystalline form of pemirolast
There is provided a hemihydrate form of the sodium salt of pemirolast.. .
Rspr Pharma Ab


 Struvite-k and syngenite composition for use in building materials patent thumbnailStruvite-k and syngenite composition for use in building materials
A composition and process for manufacture thereof used in hybrid inventive building materials comprising syngenite (k2ca(so4)2.h2o) and struvite-k (kmgpo4.6h2o). Starting constituents include magnesium oxide (mgo), monopotassium phosphate (mkp) and stucco (calcium sulfate hemihydrate), mixed in predetermined ratios, cause reactions to proceed through multiple phases, which reactions variously are proceeding simultaneously and in parallel.
Certainteed Gypsum, Inc.


Microwave heating for gypsum manufacturing processes

Methods of making calcium sulfate whiskers are provided. In one aspect, a method includes autoclaving a slurry of calcium sulfate hemihydrate and water to form calcium sulfate hemihydrate whiskers in water and microwaving the whiskers to dewater them, wherein the microwaving is effective to prevent a majority of the whiskers from reverting to a dihydrate form.
Georgia-pacific Gypsum Llc

Building products composites and methods

Methods of manufacturing composites are provided, including combining dihydrate calcium sulfate whiskers, hemihydrate calcium sulfate stucco, and water to form a slurry, and setting the slurry to form a composite having a natural porosity of about 60 volume percent or greater. Composites are also provided, including dihydrate calcium sulfate whiskers and dihydrate calcium sulfate crystals, and having a natural porosity of about 60 volume percent or greater..

Crystalline polymorphic forms of an antidiabetic compound

This compound is useful as a glucagon receptor antagonist and serves as a pharmaceutically active ingredient for the treatment of type 2 diabetes and related conditions, such as hyperglycemia, obesity, dyslipidemia, and the metabolic syndrome. Hydrates, hemihydrates, anhydrates and similar polymorphic forms are included..

Compositions and methods for reducing lime bucking in plaster products

Methods of treating lime bucking in a plaster slurry are described. The method involves providing a slurry exhibiting lime bucking having a cone penetration of less than 10 mm at a consistency of 60 cc, comprising: water; calcium sulfate hemihydrate; and hydrated lime; and mixing an effective amount of a dispersant comprising a low intensity dispersant into the slurry so that the cone penetration increases and wherein the cone penetration is 10 mm or more at 10 minutes after addition of the dispersant at a consistency of 60 cc; and applying the plaster slurry containing the dispersant to a substrate.
United States Gypsum Company

A extracting rare-earth metals

The present invention relates to a method for complex processing of apatite concentrate resulting in producing concentrate of rare earth metals (rem) and plaster from phosphogypsum, a waste of sulphuric acid technology for producing phosphoric acid from apatite. The method comprises leaching of rem into solution by recrystallization of hemihydrate or anhydrite of calcium sulphate into dihydrate of calcium sulphate with a soluble calcium salt at concentrations of 0.075-3.75 m (in terms of ca2+) and strong acid (pka0) at a concentration of 0.2-8.0 m (in terms of h+).
Opened Joint Company "united Chemical Company Uralchem"

A extracting rare-earth metals

The present invention relates to a method for complex processing of apatite concentrate resulting in producing concentrate of rare earth metals (rem) and plaster from phosphogypsum, a waste of sulphuric acid technology for producing phosphoric acid from apatite. The method comprises recrystallization of hemihydrate or anhydrite of calcium sulphate into dihydrate of calcium sulphate in the presence of a soluble calcium salt at concentrations of 0.075-3.75 m (in terms of ca2+) at subacidic conditions (ph>1), and dissolution with strong acid (pka<0) at a concentration of 0.2-8.0 m (in terms of h+).
Opened Joint Stock Company "united Chemical Company Uralchem"

Lower heat processed calcium sulphates for early strength cements and general use

The invention is related to increasing of early strength and final strengths of cements classified under en and astm as portland or cem cements and also related to all clinker employing cements and to any kinds which employ calcium sulphates for set optimization and is for composing of new cements by only assessing new methods for production and is for composing of new cements by only assessing new methods to formation and inclusion of calcium sulphate resources which are used for set optimization. A new calcium sulphate resource is obtained by employing lower heats and this input is arranged to different dehydration levels at which they can be most efficient for the selected use.

Ultra-lightweight gypsum wallboard

A gypsum wallboard and a method of making the wallboard using a modified beta-gypsum hemihydrate obtained by calcining gypsum in the presence of a calcination modifier, under conditions for forming a beta-gypsum hemihydrate, wherein the wallboard is prepared using a stucco slurry formed by mixing the modified beta-gypsum hemihydrate with water, pre-gelatinized starch and a stucco dispersant.. .
Boral Ip Holdings (australia) Pty Limited

Anhydrous and hemihydrate crystalline forms of an (r)-baclofen prodrug, methods of synthesis and methods of use

Crystalline (3r)-4-{[(1s)-2-methyl-1-(2-methylpropanoyloxyl)propoxy]carbonylamino}-3-(4-chlorophenyl)butanoic acid anhydrate and crystalline (3r)-4-{[(1s)-2-methyl-1-(2-methylpropanoyloxyl)propoxy]carbonylamino}-3-(4-chlorophenyl)butanoic acid hemihydrate, pharmaceutical compositions comprising such compounds, methods of making and methods of using the same are disclosed.. .
Xenoport, Inc.

Crystalline polymorphic forms of an antidiabetic compound

This compound is useful as a glucagon receptor antagonist and serves as a pharmaceutically active ingredient for the treatment of type 2 diabetes and related conditions, such as hyperglycemia, obesity, dyslipidemia, and the metabolic syndrome. Hydrates, hemihydrates, anhydrates and similar polymorphic forms are included..

Multiphasic bone graft substitute material

The invention provides a particulate composition adapted for forming a bone graft substitute cement upon mixing with an aqueous solution, comprising i) a calcium sulfate hemihydrate powder, wherein the calcium sulfate hemihydrate is present at a concentration of at least about 50 weight percent based on the total weight of the particulate composition; ii) a monocalcium phosphate monohydrate powder; iii) a non-porous β-tricalcium phosphate powder; and iv) a porous β-tricalcium phosphate powder. Bone graft substitute cements made therefrom, a bone graft substitute kit comprising the particulate composition, methods of making and using the particulate composition, and articles made from the bone graft substitute cement are also provided..
Wright Medical Technology, Inc.

Process for the production of phosphoric acid

The present invention concerns a process for producing phosphoric acid including at least one step of mixing sulphuric acid with a mass in reaction so as to obtain a homogeneous mixture, in which the mixing is carried out faster than the germination times of calcium sulphate hemihydrate crystals and also of calcium sulphate dihydrate in order to prevent the spontaneous germination of the hemihydrate and dihydrate calcium sulphates and in which there is a step of controlled production of calcium sulphate dihydrate germs.. .

Gypsum composite modifiers

Anhydrite calcium sulfate whiskers are prepared by combining alpha calcium sulfate hemihydrate and water to form a slurry, autoclaving the slurry to form alpha calcium sulfate hemihydrate whiskers in water, dewatering the alpha calcium sulfate hemihydrate whiskers, and heating the alpha calcium sulfate hemihydrate whiskers to form anhydrite calcium sulfate whiskers. A composite includes alpha-derived anhydrite calcium sulfate whiskers and a base material and is prepared by combining alpha-derived anhydrite calcium sulfate whiskers with a base material to form a composite..
Georgia-pacific Gypsum Llc

Method for stabilizing beta-hemihydrate plaster

The instant invention is concerned with the post-treatment of β-hemihydrate plasters for the purpose of stabilization. The invention relies in the addition of a retardant to the calcined β-hemihydrate.
Siniat International Sas

Methods of cement additive addition

The invention provides methods and compositions for producing and grinding cement. The method makes use of combining an additive with one or more components selected from a list of gypsum, hemihydrate, anhydrite, calcium sulfate to form a mixture then blending the mixture with clinker, and finally grinding the mixture and clinker to form cement.
Ecolab Usa Inc.

Struvite-k and syngenite composition for use in building materials

A composition and process for the manufacture thereof for use in a hybrid building material comprising at least in part syngenite (k2ca(so4)2.h2o) and struvite-k (kmgpo4.6h2o). Specified constituents, including magnesium oxide (mgo), monopotassium phosphate (mkp) and stucco (calcium sulfate hemihydrate) are mixed in predetermined ratios and the reaction proceeds through multiple phases reactions which at times are proceeding simultaneously and in parallel and reaction may even compete with each other for reagents if the struvite-k reaction is not buffered to slow down the reaction rate).
Certainteed Gypsum, Inc.

Method of forming a gypsum based product

A method of forming a gypsum based product is disclosed. The method comprises the steps of: calcining a mixture of water and gypsum under conditions of raised temperature and pressure within a vessel to produce an alpha-hemihydrate slurry therein; passing the alpha-hemihydrate slurry from the vessel to a mixer for mixing with additional water to produce a settable slurry, which is arranged to set to form the gypsum based product..
Saint-gobain Place Sas

New crystalline form of pemirolast

There is provided a hemihydrate form of the sodium salt of pemirolast.. .

Method for in-situ manufacture of a lightweight fly ash based aggregate

A method of making a rapid setting lightweight homogeneous foamed fly ash based cementitious aggregate composition with improved compressive strength for products such as panels is disclosed. The method mixes fly ash, alkali metal salt of citric acid, foaming agent for entraining air, optional foam stabilizing agent, a calcium sulfate such as stucco or gypsum, and water.

Dental gypsum powder

Provided is a dental gypsum powder having flowability, setting time, and strength of a set material that are suitable for producing a dental model. The dental gypsum powder contains 100 parts by weight of gypsum hemihydrate, 2 to 4 parts by weight of gypsum dihydrate, from 0.5 to 3 parts by weight of potassium sulfate, from 0.05 to 0.8 parts by weight of a polycarboxylate water reducing agent, and not contain more than 0.3 parts by weight of other additives.

Production of phosphoric acid by a two-stage crystallization process

A process and system for producing phosphoric acid. Phosphate rock is dissolved in phosphoric acid in a reaction vessel to form a slurry.

Reaction material and chemical heat pump

A reaction material for a chemical heat pump includes type iii anhydrous gypsum, a magnesium compound, and caxmg1-xso4. The reaction material for the chemical heat pump structurally changes between a compound including type iii anhydrous gypsum, the magnesium compound, and caxmg1-xso4, and a compound including hemihydrate gypsum, a hydrate of the magnesium compound, and a hydrate of caxmg1-xso4 when subjected to heat storage process and heat release process.

Preparation of crystalline forms of dihydropyrazolopyrimidinone

The instant invention relates to crystalline forms of mk-1775, an inhibitor of weel kinase. Specifically, the instant invention relates to hemihydrates of mk-1775..

Crystalline polymorphic forms of an antidiabetic compound

This compound is useful as a glucagon receptor antagonist and serves as a pharmaceutically active ingredient for the treatment of type 2 diabetes and related conditions, such as hyperglycemia, obesity, dyslipidemia, and the metabolic syndrome. Hydrates, hemihydrates, anhydrates and similar polymorphic forms are included..

Surfactant-coated hemihydrate gypsum and production method thereof

The residual rate of the surfactant when the surfactant-coated hemihydrate gypsum is heated up to 300° c. Is not less than 40 wt % of the amount of the surfactant before heating..

Cementitious binders containing pozzolanic materials

A cementitious composition including: a binder containing (a) 60-94%, by weight, of at least one pozzolanic material; (b) at least 0.5% calcium sulfoaluminate (csa), by weight; (c) 1.2-11% by weight, expressed as so3, of at least one inorganic sulfate selected from the group of sulfates consisting of a calcium sulfate hemihydrate, an anhydrous calcium sulfate, a calcium sulfate dihydrate, a sodium sulfate, and a sodium calcium sulfate; and (d) a total sulfate content of at least 3%, by weight, expressed as so3, the cementitious composition including, at most, 3% natural lime, the cementitious composition including, at most, 10% alumina cement, the contents of the composition being calculated on a dry, aggregateless basis.. .

Bone graft substitute composition

A composition includes calcium sulfate hemihydrate, stearic acid, an accelerant, and a mixing solution. The composition can be injected, e.g., through a needle, and is capable of setting, e.g., in vivo, in a relatively short period of time to a relatively high hardness..

Non-aqueous rapid setting drywall compound and use

A non-aqueous drywall compound being the combination of a first component mixture of acetone, a non-aqueous liquid adhesive containing ethyl cyanoacrylate, and a powder containing calcium sulfate hemihydrate (plaster of paris), the mixture being a pliable putty capable of adhering to gypsum wallboard or similar work surfaces. The second component of the drywall compound is an accelerator or activator containing acetone and toluene.

Dihydrate-hemihydrate process for producing phosphoric acid

A method for producing phosphoric acid, comprising attack in an aqueous medium of phosphated rock with sulfuric acid, with formation of a first dihydrate slurry suspended in an aqueous phase having a free p2o5 content between 38 and 50% and a free so3 content of less than 0.5%, conversion of this first slurry by heating with recrystallization of the solubilized calcium sulfate giving rise to a second hemihydrate slurry, and separation in the second slurry between a production phosphoric acid and a hemihydrate cake, characterized in that it comprises during the attack, addition of a fluorine source in the first slurry in a content from 1% to 5% by weight of f relatively to the p2o5 contained in the phosphated rock.. .

Additives in gypsum slurries and adjusting their proportions

A gypsum slurry is provided that includes calcium sulfate hemihydrate; water; a dispersant component comprising at least one of the following a comb-branched polymer with polyether side chains, naphthalene sulfonate-formaldehyde condensate or melamine sulfonate-formaldehyde condensate; a foaming agent; and a polycondensation component with three polycondensation repeating units. Also provided is a method for making a gypsum slurry with a foaming agent in which the ratio between the dispersant component and the polycondensation component is adjusted to control for the size of foam bubbles in the gypsum slurry.

Anhydrous and hemihydrate crystalline forms of an (r)-baclofen prodrug, methods of synthesis and methods of use

Crystalline (3r)-4-{[(1s)-2-methyl-1-(2-methylpropanoyloxy)propoxy]carbonylamino}-3-(4-chlorophenyl)butanoic acid anhydrate and crystalline (3r)-4-{[(1s)-2-methyl-1-(2-methylpropanoyloxy)propoxy]carbonylamino}-3-(4-chlorophenyl)butanoic acid hemihydrate, pharmaceutical compositions comprising such compounds, methods of making and methods of using the same are disclosed.. .

Process for continuous modification of dihydrate gypsum and modified dihydrate gypsum obtained by the process

A process for the continuous modification of dihydrate gypsum includes calcining dihydrate gypsum into hemihydrate gypsum and recrystallizing the hemihydrate gypsum in an aqueous slurry to convert the hemihydrate gypsum into modified dihydrate gypsum of different crystalline form. The aqueous slurry in a recrystallization reaction tank is maintained at a constant temperature under stirring, and a feed rate of the hemihydrate gypsum to the recrystallization reaction tank and a discharge rate of the recrystallized dihydrate gypsum are controlled to substantially equal.



Hemihydrate topics:
  • Calcium Sulfate
  • Hemihydrate
  • Carbon Black
  • Touch Screen
  • Crystallin
  • Phosphoric Acid
  • Sulfuric Acid
  • Aspect Ratio
  • Ed Coating
  • Maleic Anhydride
  • Diisobutylene
  • Isobutylene
  • Polymer Binder
  • Enantiomer
  • Modified Release


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    This listing is a sample listing of patent applications related to Hemihydrate for is only meant as a recent sample of applications filed, not a comprehensive history. There may be associated servicemarks and trademarks related to these patents. Please check with patent attorney if you need further assistance or plan to use for business purposes. This patent data is also published to the public by the USPTO and available for free on their website. Note that there may be alternative spellings for Hemihydrate with additional patents listed. Browse our RSS directory or Search for other possible listings.


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