US Patent 6964704 Calcium sulphate-based composition and methods of making same
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Patent abstract
Disclosed is an improved alpha calcium sulfate hemihydrate. Methods of producing an improved powdered calcium sulfate hemihydrate (CaSO4·½H2O) [alpha-type] compound are disclosed, at least one method including forming calcium sulfate dihydrate (CaSO4·2H2O) into a briquette under high pressure, calcining the briquette to transform the calcium sulfate dihydrate to calcium sulfate hemihydrate [alpha-type], drying the calcium sulfate hemihydrate [alpha-type] briquette, and optionally grinding the briquette. Also disclosed are methods of producing an improved gypsum plaster including producing the disclosed powdered calcium sulfate hemihydrate [alpha-type] and mixing the powdered calcium sulfate hemihydrate [alpha-type] with water.
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Patent Inventor Names
Danny W. Cox0
Robert B. Bruce0
Date of Patent
November 15, 2005
0Patent Application Number
108007800
Date Filed
March 15, 2004
0Patent Primary Examiner
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US Patent 6964704 Calcium sulphate-based composition and methods of making same
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