Patent US739793A successfully refreshed from Google Patents.
US5338356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calcium phosphate granular cement and method for producing same
Assignee: Pentax Corp
•
Filing: 1992-10-21
•
Granted: 1994-08-16
•
Expires: 2012-10-21
Abstract
Abstract A calcium phosphate granular cement contains mixed powders obtained by mixing α-type calcium tertiary phosphate or calcium quaternary phosphate with a calcium phosphate compound selected from calcium primary phosphate, calcium secondary phosphate and mixtures thereof at a Ca/P molar ratio of 1.35 to 1.49 or 1.30 to 1.90. A minimum diameter of each cement granule is 0.1 to 1.0 mm.
Inventors
- 👤 Masahiro Hirano
- 👤 Hiroyasu Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/34; C04B28/344; A; A61; A61K; A61K6/00; A61K6/80; A61K6/831; A61K6/838; A61K6/849; A61K6/864; A61L; A61L24/00; A61L24/02; A61L27/00; A61L27/02; A61L27/12; C04B12/00; C04B12/02; C04B12/025; C04B20/00; C04B20/0076; A61F; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293; C04B2111/00; C04B2111/00474; C04B2111/00836
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
A calcium phosphate granular cement comprising mixed powders obtained by mixing α-type calcium tertiary phosphate with a calcium phosphate compound selected from the group consisting of calcium primary phosphate, calcium secondary phosphate and mixtures thereof at a Ca/P molar ratio of 1.35 to 1.49, a minimum diameter of each cement granule being 0.1 to 1.0 mm.
Claim 2
Dependent Claim
56 words
A calcium phosphate granular cement comprising mixed powders obtained by mixing α-type calcium tertiary phosphate with a calcium phosphate compound selected from the group consisting of calcium primary phosphate, calcium secondary phosphate and mixtures thereof at a Ca/P molar ratio of 1.35 to 1.49, a minimum diameter of each cement granule being 0.1 to 1.0 mm.
Claim 3
Dependent Claim
19 words
The calcium phosphate granular cement according to claim 1 wherein the calcium primary phosphate comprises calcium primary phosphate monohydrate.
Claim 4
Dependent Claim
34 words
The calcium phosphate granular cement according to claim 1 wherein the calcium secondary phosphate comprises a member selected from the group consisting of calcium secondary phosphate dihydrate, calcium secondary phosphate anhydride and mixtures thereof.
Claim 5
Dependent Claim
54 words
The calcium phosphate granular cement according to claim 1 wherein when a mixture of the calcium primary phosphate and the calcium secondary phosphate is used as the calcium phosphate compound, a mixing ratio of the calcium secondary phosphate is selected to be 10 wt % or less based on total weight of the powders.
Claim 6
Dependent Claim
49 words
The calcium phosphate granular cement according to claim 1 further comprising a water component selected from the group consisting of water and sterilized physiological saline, said water component being contained in an amount of 300 to 30 parts by weight to 100 total parts by weight of the powders.
Claim 7
Dependent Claim
55 words
A calcium phosphate granular cement comprising mixed powders obtained by mixing calcium quaternary phosphate with a calcium phosphate compound selected from the group consisting of calcium primary phosphate, calcium secondary phosphate and mixtures thereof at a Ca/P molar ratio of 1.30 to 1.90, a minimum diameter of each cement granule being 0.1 to 1.0 mm.
Claim 8
Dependent Claim
55 words
A calcium phosphate granular cement comprising mixed powders obtained by mixing calcium quaternary phosphate with a calcium phosphate compound selected from the group consisting of calcium primary phosphate, calcium secondary phosphate and mixtures thereof at a Ca/P molar ratio of 1.30 to 1.90, a minimum diameter of each cement granule being 0.1 to 1.0 mm.
Claim 9
Dependent Claim
19 words
The calcium phosphate granular cement according to claim 6 wherein the calcium primary phosphate comprises calcium primary phosphate monohydrate.
Claim 10
Dependent Claim
34 words
The calcium phosphate granular cement according to claim 6 wherein said calcium secondary phosphate comprises a member selected from the group consisting of calcium secondary phosphate dihydrate, calcium secondary phosphate anhydride and mixtures thereof.
Claim 11
Dependent Claim
47 words
The calcium phosphate granular cement according to claim 6 further comprising a water component selected from the group consisting of water and sterilized physiological saline, said water component being contained in an amount of 300 to 30 parts by weight to 100 total parts by weight powders.
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) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |