US5152836A
Expired / Lapsed
US
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Hydraulic calcium phosphate cement composition and cement composition containing hardening liquid
Assignee: Mitsubishi Materials Corp
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Filing: 1991-09-12
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Granted: 1992-10-06
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Expires: 2011-09-12
Abstract
Abstract A hydraulic calcium phosphate cement composition contains as main ingredients powders of calcium tertiary phosphate and calcium secondary phosphate with a molar ratio of Ca/P of 1.400 to 1.498. The calcium tertiary phosphate contains α-type calcium tertiary phosphate and β-type calcium tertiary phosphate. The cement composition may contain a hardening liquid including water.
Inventors
- 👤 Masahiro Hirano
- 👤 Hiroyasu Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:30
CPC Classifications
A; A61; A61L; A61L24/00; A61L24/0047; A61L24/0073; A61L24/0084; A61K; A61K6/00; A61K6/50; A61K6/54; A61K6/80; A61K6/831; A61K6/838; A61K6/849; A61K6/864; A61K6/873; A61K6/884; A61K6/891; A61L24/02; A61L27/00; A61L27/02; A61L27/12; A61L27/40; A61L27/44; A61L27/46; C; C04; C04B; C04B12/00; C04B12/02; C04B12/025; C04B28/00; C04B28/34; C04B28/344; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; C04B2111/00; C04B2111/00474; C04B2111/00836
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
43 words
A hydraulic calcium phosphate cement composition comprising as main ingredients powders of calcium tertiary phosphate and calcium secondary phosphate with a molar ratio of Ca/P of 1.400 to 1.498, said calcium tertiary phosphate containing α-type calcium tertiary phosphate and β-type calcium tertiary phosphate.
Claim 2
Dependent Claim
43 words
A hydraulic calcium phosphate cement composition comprising as main ingredients powders of calcium tertiary phosphate and calcium secondary phosphate with a molar ratio of Ca/P of 1.400 to 1.498, said calcium tertiary phosphate containing α-type calcium tertiary phosphate and β-type calcium tertiary phosphate.
Claim 3
Dependent Claim
34 words
The hydraulic calcium phosphate cement composition of claim 1, in which said α-type calcium tertiary phosphate and said β-type calcium tertiary phosphate are mixed in a mixing ratio of 97:3 to 50:50 by weight.
Claim 4
Dependent Claim
29 words
The hydraulic calcium phosphate cement composition of claim 1, in which at least α-type calcium tertiary phosphate contained in said calcium tertiary phosphate is synthesized by a wet process.
Claim 5
Dependent Claim
28 words
The hydraulic calcium phosphate cement composition of claim 1, in which said α-type calcium tertiary phosphate and said β-type calcium tertiary phosphate are synthesized by a wet process.
Claim 6
Dependent Claim
27 words
The hydraulic calcium phosphate cement composition of claim 1, in which said α-type calcium tertiary phosphate is synthesized at a sintering temperature not less than 1200° C.
Claim 7
Dependent Claim
26 words
The hydraulic calcium phosphate cement composition of claim 1, in which said β-type calcium tertiary phosphate is synthesized at a sintering temperature from 900° C. to
Claim 8
Dependent Claim
27 words
The hydraulic calcium phosphate cement composition of claim 1 further comprising ceramics powders selected from the group consisting of calcium quarternary phosphate, hydroxyapatite, alumina and mixtures thereof.
Claim 9
Dependent Claim
47 words
A cement composition containing a hardening liquid comprising the hydraulic calcium phosphate cement composition of claim 1 and a hardening liquid containing water, said hydraulic calcium phosphate cement composition and said hardening liquid containing water being mixed in a mixing ratio of 1.0 to 2.5:1.0 by weight.
Claim 10
Dependent Claim
58 words
The cement composition containing a hardening liquid of claim 8 further comprising a water soluble sodium salt selected from the group consisting of sodium succinate, sodium lactate, sodium acetate, sodium chloride and mixtures thereof, an added amount of said water soluble sodium salt being not more than 30 wt % based on the total hardening liquid containing water.
Claim 11
Dependent Claim
36 words
The cement composition containing a hardening liquid of claim 8, in which said hardening liquid containing water further contains a water soluble polymer selected from the group consisting of polysaccharides, a polymer surfactant and mixtures thereof.
Claim 12
Dependent Claim
42 words
The cement composition containing a hardening liquid of claim 10, in which said polysaccharides are selected from the group consisting of chitin, chitosan, soluble starch, glycogen, gum arabi, alginic acid, hyaluronic acid, chondroitin sulfuric acid and a salt thereof and mixtures thereof.
Claim 13
Dependent Claim
37 words
The cement composition containing a hardening liquid of claim 10, in which said polymer surfactant is selected from the group consisting of polypropylene glycol, polyethylene glycol, polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxypropylmethyl cellulose and mixtures thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |