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US 5,047,031 AGranted
In situ calcium phosphate minerals method
AssigneeNorian Corporation
InventorBrent R. Constantz
Life of this patent
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Abstract
Calcium phosphate minerals are formed by using phosphoric acid substantially free of uncombined water in conjunction with a calcium source, normally as any combination of carbonate, phosphate and hydroxide, and, as required, any additional base to neutralize the phosphoric acid. Protein may be optionally added. The resulting product is readily formed and then sets to a hard, stable, workable shaped object.
Claims14
A method for making calcium phosphate minerals comprising:
- combining phosphoric acid, substantially free of uncombined water, a calcium source, neutralizing anions including at least one of carbonate, phosphate and hydroxide in an amount sufficient to substantially neutralise said phosphoric acid and water in an amount to provide a kneadable mixture;
- agitating the mixture to produce a substantially uniform mixture;
- and
- allowing the substantially uniform mixture to set and become annealed to a hard workable structure.
1 more element
A method for making hydroxyapatite comprising:
- combining orthophosphoric acid crystals, a neutralizing source comprising at least one of calcium carbonate, alkali metal hydroxide, calcium hydroxide or calcium phosphate, in an amount to provide a substantially neutral product, and water in an amount to provide a kneadable mixture;
- agitating the mixture to produce a substantially uniform mixture;
- and
- allowing the substantially uniform mixture to set and become matured to a hard workable structure.
1 more element
Dependencies are inferred from the claim text.