Patent US3787900A successfully refreshed from Google Patents.
US3787900A
Expired / Lapsed
US
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Artificial bone or tooth prosthesis material
Assignee: Iowa State University Research Foundation Inc
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Filing: 1971-06-09
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Granted: 1974-01-29
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Expires: 1991-06-09
Abstract
Abstract A prosthesis material useful for artificial bones or teeth is provided in the form of a heat-consolidated body composed essentially of a dense structurally integrated mixture of discrete microcrystals of a calcium phosphate compound together with discrete microcrystals of a refractory compound, such as the mineral spinel, aluminum phosphate, or aluminum oxide. The preferred calcium phosphate compound is whitlockite, but it can be used in combination with other more soluble calcium phosphate compounds.
Inventors
- 👤 Gee T Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:59
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
The prosthesis material of claim 1 in which said calcium phosphate component is whitlockite.
Claim 2
Dependent Claim
14 words
The prosthesis material of claim 1 in which said refractory compound means is MgAl2O4.
Claim 3
Dependent Claim
101 words
A strong dense artificial bone or tooth prosthesis material in the form of a crystalline ceramic body which has been heat-consolidated to a substantially maximum bulk density with minimized apparent porosity, said body consisting essentially of a mixture of discrete microcrystals of a calcium phosphate component selected from the group consisting of Ca3(PO4)2, CaP2O6, Ca2P2O7, Ca4P2O9, and mixtures thereof, together with discrete microcrystals of refractory component selected from MgAl2O4, AlPO4, Al2O3, and mixtures thereof, said body containing from 15 to 75 percent by weight of said calcium phosphate component and from 25 to 85 percent by weight of said refractory component.
Claim 4
Dependent Claim
21 words
The prosthesis material of claim 4 in which at least 45 weight percent of the said calcium phosphate component is Ca3(PO4)2.
Claim 5
Dependent Claim
16 words
The prosthesis material of claim 4 in which substantially all of said refractory component is MgAl2O4.
Claim 6
Dependent Claim
50 words
The prosthesis material of claim 4 in which the total mole percent of said calcium phosphate component consists of from 45 to 99 weight percent of Ca3(PO4)2 together with from 1 to 55 weight percent of at least one compound selected from the group consisting of CaP2O6, Ca2P2O7, and Ca4P2O9.
Claim 7
Dependent Claim
29 words
The prosthesis material of claim 4 in which the total of said calcium phosphate component provides a ratio of from 0.3 to 2.0 moles calcium per mole of phosphorous.
Claim 8
Dependent Claim
129 words
A strong dense artificial bone or tooth prosthesis material in the form of a crystalline ceramic body which has been heat-consolidated to a substantially maximum bulk density with minimized apparent porosity, said body consisting of a mixture of discrete microcrystals of MgAl2O4 together with discrete calcium phosphate microcrystals selected from the group consisting of whitlockite and mixtures of whitlockite with another calcium phosphate component selected from the group consisting of CaP2O6, Ca2P2O7, Ca4P2O9, and mixtures thereof, said mixture of whitlockite with said other calcium phosphate component containing at least 45 weight percent of said whitlockite, said body containing a total of 15 to 75 percent by weight of microcrystals of said whitlockite and said other calcium phosphate and from 25 to 85 percent by weight of said MgAl2O4 microcrystals.
Claim 9
Dependent Claim
33 words
The prosthesis material of claim 9 in which the total of said whitlockite and said other calcium phosphate component provides a ratio of from 0.3 to 2.0 moles calcium per mole of phosphorous.
Claim 10
Dependent Claim
33 words
The prosthesis material of claim 9 in which the total of said whitlockite aud said other calcium phosphate component provides a ratio of from 0.5 to 1.2 moles calcium per mole of phosphorous.
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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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |