US5281404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for forming calcium phosphate type setting material and process for producing setting material
Assignee: Pentax Corp
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Filing: 1992-09-25
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Granted: 1994-01-25
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Expires: 2012-09-25
Abstract
Abstract A composition for forming a calcium phosphate type setting material comprising (1) powder comprising at least one of (alpha)-tricalcium phosphate and tetracalcium phosphate; and (2) a setting solution comprising an aqueous acidic solution having dissolved therein at least one polysaccharide selected from the group consisting of carboxymethyl chitin, glycol chitin, pullulan, high methoxy-pectin and chitosan in such an amount that the setting solution has a viscosity of 70 cp or more, and a process for producing a calcium phosphate type setting material using such a composition.
Inventors
- 👤 Masaya Sumita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:29
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61K; A61K6/00; A61K6/50; A61K6/54; A61K6/80; A61K6/831; A61K6/838; A61K6/849; A61K6/864; A61L27/40; A61L27/44; A61L27/46; C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B28/00; C04B28/34; C04B28/346; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; C04B2111/00; C04B2111/00474; C04B2111/00836
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
64 words
A process for producing a calcium phosphate comprising the step of calcining, at a temperature of from about 1,150° C. to 1,450° C. under a pressure of about 10 pa or less, a calcium phosphate having a molar ratio of Ca/P of about 1.8 or less and more than 1.5 so as to produce a mixture consisting essentially of α-tricalcium phosphate and tetracalcium phosphate.
Claim 2
Dependent Claim
64 words
A process for producing a calcium phosphate comprising the step of calcining, at a temperature of from about 1,150° C. to 1,450° C. under a pressure of about 10 pa or less, a calcium phosphate having a molar ratio of Ca/P of about 1.8 or less and more than 1.5 so as to produce a mixture consisting essentially of α-tricalcium phosphate and tetracalcium phosphate.
Claim 3
Dependent Claim
15 words
The process of claim 1, wherein said pressure is about 10 -2 Pa or less.
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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) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |