US4613577A
Expired / Lapsed
US
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Fiber glass mainly composed of calcium phosphate
Assignee: Mitsubishi Mining and Cement Co Ltd
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Filing: 1984-06-26
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Granted: 1986-09-23
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Expires: 2004-06-26
Abstract
Abstract A fiber glass is provided for filling in a defect or hollow portion of bone. The fiber glass comprises calcium phosphate as a main ingredient and has a negative zeta potential. The calcium phosphate has a molar ratio of Ca/P of not less than 0.2 and less than 0.6 and the total content of CaO plus P2O5 in the fiber glass is less than 80 wt %. The fiber glass is of long filament form or staple fiber form. The fiber glass of long filament form may be woven to form a woven filler.
Inventors
- 👤 Hideo Tagai
- 👤 Masahiro Kobayashi
- 👤 Shigeo Niwa
- 👤 Hiroyasu Takeuchi
- 👤 Mikiya Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:28
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61F; A61F2/00; A61F2/02; A61F2/28; A61L27/28; A61L27/30; A61L27/32; C; C03; C03C; C03C13/00; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; A61F2310/00389; A61F2310/00592; A61F2310/00796; A61L2430/00; A61L2430/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/294; Y10T428/2956; Y10T428/2958
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
72 words
A fiber glass for filling in a defect or hollow portion of bone, said fiber glass having a negative zeta potential and containing calcium phosphate having a molar ratio of Ca to P of not less than 0.2 and less than 0.6, and the total content of CaO plus P 2 O 5 in the fiber glass, based on the weight of the fiber glass, being not less than 80% by weight.
Claim 2
Dependent Claim
72 words
A fiber glass for filling in a defect or hollow portion of bone, said fiber glass having a negative zeta potential and containing calcium phosphate having a molar ratio of Ca to P of not less than 0.2 and less than 0.6, and the total content of CaO plus P 2 O 5 in the fiber glass, based on the weight of the fiber glass, being not less than 80% by weight.
Claim 3
Dependent Claim
20 words
The fiber glass according to claim 1, wherein said fiber glass has a zeta potential of -(minus)0.05 to -(minus)20.0 mV.
Claim 4
Dependent Claim
20 words
The fiber glass according to claim 1, wherein said fiber glass has a zeta potential of -(minus)0.2 to -(minus)10.0 mV.
Claim 5
Dependent Claim
45 words
The fiber glass according to claim 1, wherein said fiber glass is prepared by cooling a molten mass containing a mixture of at least one phosphorous-containing compound with at least one compound selected from the group consisting of calcium phosphate compounds and other calcium-containing compounds.
Claim 6
Dependent Claim
15 words
The fiber glass according to claim 4, wherein said molten mass contains an inorganic oxide.
Claim 7
Dependent Claim
30 words
The fiber glass according to claim 5, wherein said inorganic oxide is selected from the group consisting of alumina, silica, sodium oxide, iron oxide, magnesium oxide, kaolin and mixtures thereof.
Claim 8
Dependent Claim
29 words
The fiber glass according to claim 4, wherein said calcium phosphate compound is selected from the group consisting of tetracalcium phosphate, hydroxyapatite, tricalcium phosphate, animal bones and mixtures thereof.
Claim 9
Dependent Claim
28 words
The fiber glass according to claim 4, wherein said other calcium-containing compound is selected from the group consisting of quick lime, slaked lime, calcium carbonate and mixtures thereof.
Claim 10
Dependent Claim
29 words
The fiber glass according to claim 4, wherein said phosphorous-containing compound is selected from the group consisting of triammonium phosphate, ammonium hydrogenphosphate, sodium phosphate, phosphoric acid and mixtures thereof.
Claim 11
Dependent Claim
35 words
The fiber glass according to claim 4, wherein said molten mass has a melting temperature of 800° C. to 1400° C. and wherein said glass contains 0 to 20%, by weight, of an inorganic oxide.
Claim 12
Dependent Claim
35 words
The fiber glass according to claim 4, wherein said molten mass has a melting temperature of 900° C. to 1300° C. and wherein said glass contains 1 to 15%, by weight, of an inorganic oxide.
Claim 13
Dependent Claim
19 words
The fiber glass according to claim 1, wherein said fiber glass is of filament form or staple fiber form.
References Cited (Backward Citations)
US4376168A
Cited
GB2087375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |