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US 4,443,261 AGranted
Method of preparing gypsum articles
AssigneeTenax Maskin AB
InventorSune Nordqvist
Life of this patent
Estimating the term…
Abstract
Plaster products can be prepared from calcium sulfate dihydrate by adding to a water slurry of calcium sulfate dihydrate a potassium salt, especially potassium hydrogen-carbonate or potassium tetraborate but, in the first place, potassium sulfate, including a carrier, after which the water slurry is moulded and further worked in known manner to the desired plaster product, especially plaster board or moulds for the production of metal articles or ceramic articles.
Claims4
A method of preparing solidified calcium sulfate dihydrate comprising:
- adding potassium sulfate to a water slurry of calcium sulfate dihydrate in an amount of at least 5% by weight of the calcium sulfate dihydrate;
- and
- solidifying the said solution while maintaining the solution at a temperature below 70.degree. C.
Dependencies are inferred from the claim text.