US4673355A
Expired / Lapsed
US
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Solid calcium phosphate materials
Assignee: Individual
•
Filing: 1985-08-09
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Granted: 1987-06-16
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Expires: 2005-08-09
Abstract
Abstract This invention relates to the formation of a new solid material composed of calcium phosphates and to the reaction method for producing this material. The solid calcium phosphate material is created by chemically reacting calcium ion sources with phosphate ion sources in a molten state and cooling the reaction mixture to room temperature producing the solid material. Depending upon the ratio of components and the parameters of the heating reaction, the resulting material may be a smooth, non-porous material with exceptional hardness, or it may be a porous material. Both types of material can be shaped into desired configurations, such as artificial teeth.
Inventors
- 👤 Edward T. Farris
- 👤 John J. Barsa
- 👤 Richard J. Lagow
- 👤 Paul J. Capano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:09
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/28; A61K; A61K6/00; A61K6/15; A61K6/17; A61K6/70; A61K6/71; A61K6/74; A61K6/75; A61K6/80; A61K6/849; A61K6/864; A61L; A61L27/00; A61L27/02; A61L27/12; C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/32; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
76 words
A method of producing a nonapatitic solid material containing calcium and phosphate, comprising the steps of: a. forming a reactant mixture of calcium ions and phosphate ions in phosphoric acid, the mixture having a calcium to phosphate ratio of about 0.1 to about 1.34; b. heating the mixture to a molten state of above about 750° C. at which the ions react; and c. cooling the reaction mixture thereby forming a nonapatitic solid calcium phosphate material.
Claim 2
Independent Claim
76 words
A method of producing a nonapatitic solid material containing calcium and phosphate, comprising the steps of: a. forming a reactant mixture of calcium ions and phosphate ions in phosphoric acid, the mixture having a calcium to phosphate ratio of about 0.1 to about 1.34; b. heating the mixture to a molten state of above about 750° C. at which the ions react; and c. cooling the reaction mixture thereby forming a nonapatitic solid calcium phosphate material.
Claim 3
Dependent Claim
20 words
A method of claim 1, further comprising the step of preheating the mixture to a temperature below the reaction temperature.
Claim 4
Dependent Claim
34 words
A method of claim 1, further comprising the step of incorporating into the mixture of calcium and phosphate ions, either before or during heating to the molten state, apatitic calcium phosphates or metal ions.
Claim 5
Dependent Claim
12 words
A solid calcium phosphate material prepared by the method of claim 3.
Claim 6
Dependent Claim
50 words
A method of claim 1, wherein the calcium ions are provided by any one or any combination of the sources of calcium ions selected from the group of materials consisting of apatitic calcium phosphates, non-apatitic calcium phosphates, calcium hydroxide, calcium oxide, calcium carbonate, calcium salts, calcium halide and calcium metal.
Claim 7
Dependent Claim
44 words
A method of claim 1, wherein the phosphate ions are provided by any one or any combination of the sources of phosphate ions selected from the group of materials consisting of orthophosphoric acid, pyrophoric acids, condensed phosphates, phosphate of non-metal cations and metal phosphates.
Claim 8
Dependent Claim
14 words
A method of claim 1, wherein the mixture is heated in an electric furnace.
Claim 9
Dependent Claim
21 words
A method of claim 1, wherein the mixture is heated by means of laser excitation, microwave radiation or radio frequency radiation.
Claim 10
Dependent Claim
13 words
A nonapatitic solid calcium phosphate material produced by the method of claim 1.
Claim 11
Independent Claim
63 words
A method of producing a nonapatitic solid material containing calcium and phosphate, comprising the steps of: a. forming a mixture of hyroxyapatitde and phosphoric acid having a calcium to phosphorous molar ratio of about 0.1 to about 1.34; b. heating the mixture to a molten state of above about 750° C.; and c. cooling the mixture to produce a solid calcium phosphate material.
Claim 12
Independent Claim
63 words
A method of producing a nonapatitic solid material containing calcium and phosphate, comprising the steps of: a. forming a mixture of hyroxyapatitde and phosphoric acid having a calcium to phosphorous molar ratio of about 0.1 to about 1.34; b. heating the mixture to a molten state of above about 750° C.; and c. cooling the mixture to produce a solid calcium phosphate material.
Claim 13
Dependent Claim
12 words
A solid calcium phosphate material produced by the method of claim 10.
Claim 14
Independent Claim
65 words
A method of producing a non-apatitic, solid, porous material containing calcium and phosphate, comprising the steps of: a. forming a mixture of hydroxyapatitde and phosphoric acid having a calcium to phosphorus molar ratio of about 0.5 to about 1.34; b. heating the mixture to a molten state of above about 850° C.; and c. cooling the mixture to produce a solid, porous calcium phosphate material.
Claim 15
Independent Claim
65 words
A method of producing a non-apatitic, solid, porous material containing calcium and phosphate, comprising the steps of: a. forming a mixture of hydroxyapatitde and phosphoric acid having a calcium to phosphorus molar ratio of about 0.5 to about 1.34; b. heating the mixture to a molten state of above about 850° C.; and c. cooling the mixture to produce a solid, porous calcium phosphate material.
Claim 16
Dependent Claim
21 words
A method of claim 12, further comprising the step of preheating the mixture to a temperature below the molten state temperature.
Claim 17
Dependent Claim
12 words
A porous calcium phosphate material produced by the method of claim 12.
Claim 18
Dependent Claim
32 words
A method of claim 12, for producing a molded porous calcium phosphate material, further comprising the step of placing the mixture into a mold of a desired shape before the heating step.
Claim 19
Dependent Claim
14 words
A method of claim 12, wherein the mixture is heated in an electric furnace.
Claim 20
Dependent Claim
20 words
A method of claim 12, wherein the mixture is heated by means of laser excitation, microwave radiation or radiofrequency radiation.
Claim 21
Dependent Claim
15 words
A tooth restorative comprising a calcium phosphate material produced by the method of claim 12.
Claim 22
Dependent Claim
15 words
A surgical implant comprising a calcium phosphate material produced by the method of claim 12.
Claim 23
Dependent Claim
64 words
A nonapatitic, solid, essentially non-porous material containing calcium and phosphate, comprising the steps of: a. forming a mixture of hydroxyapatite and phosphoric acid having a calcium to phosphorous molar ratio of about 0.1 to about 0.5; b. heating the mixture to a molten state of above about 750° C.; and c. cooling the reaction product to form a solid, essentially nonporous calcium phosphate material.
Claim 24
Dependent Claim
64 words
A nonapatitic, solid, essentially non-porous material containing calcium and phosphate, comprising the steps of: a. forming a mixture of hydroxyapatite and phosphoric acid having a calcium to phosphorous molar ratio of about 0.1 to about 0.5; b. heating the mixture to a molten state of above about 750° C.; and c. cooling the reaction product to form a solid, essentially nonporous calcium phosphate material.
Claim 25
Dependent Claim
17 words
A method of claim 20 wherein the mixture is heated to a temperature of about 900°-1100° C.
Claim 26
Dependent Claim
21 words
A method of claim 20 further comprising the step of preheating the mixture to a temperature below the molten state temperature.
Claim 27
Dependent Claim
15 words
A nonapatitic solid, essentially nonporous calcium phosphate material produced by the method of claim 20.
Claim 28
Dependent Claim
33 words
A method of claim 20, for producing a molded essentially nonporous calcium phosphate material, further comprising the step of placing the mixture into a mold of a desired shape before the heating step.
Claim 29
Dependent Claim
14 words
A method of claim 20, wherein the mixture is heated in an electric furnace.
Claim 30
Dependent Claim
20 words
A method of claim 20, wherein the mixture is heated by means of laser excitation, microwave radiation or radiofrequency radiation.
Claim 31
Dependent Claim
24 words
A method of claim 20, for forming a tooth restorative, further comprising the step of placing the mixture into a tooth defect before heating.
Claim 32
Dependent Claim
15 words
A method of claim 27, wherein the mixture is heated by means of laser excitation.
Claim 33
Dependent Claim
24 words
An artificial tooth crown comprising a crown-shaped piece of the nonapatitic solid, essentially nonporous calcium phosphate material produced by the method of claim 20.
Claim 34
Dependent Claim
15 words
A tooth restorative comprising a calcium phosphate material produced by the method of claim 20.
Claim 35
Dependent Claim
15 words
A surgical implant comprising a calcium phosphate material produced by the method of claim 20.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-15 | 1990-12-15 | 1991-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-15 | 1994-12-15 | 1995-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-15 | 1998-12-15 | 1999-06-16 | $7700.00 | Window Closed / Lapsed |