US4643982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength glass-ceramic containing anorthite crystals and process for producing the same
Assignee: Hoya Corp
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Filing: 1985-12-04
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Granted: 1987-02-17
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Expires: 2005-12-04
Abstract
Abstract A high-strength glass-ceramic containing apatite crystals or beta -tricalcium phosphate crystals, and anorthite crystals, and a process for producing the same are disclosed. The glass-ceramic has an excellent biocompatibility and is useful as an implant material such as an artificial dental root and an artificial bone.
Inventors
- 👤 Toshihiro Kasuga
- 👤 Kenji Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:57
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/02; A61L27/12; A61F; A61F2/00; A61F2/02; A61F2/28; A61K; A61K6/00; A61K6/50; A61K6/58; A61K6/80; A61K6/802; A61K6/807; A61K6/816; A61K6/818; A61K6/824; A61K6/831; A61K6/833; C; C03; C03C; C03C10/00; C03C10/0009; C03C10/16; C03C4/00; C03C4/0007; A61F2310/00; A61F2310/00005; A61F2310/00179; A61F2310/00293
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
A high-strength glass-ceramic having a composition consisting essentially of anorthite crystals and consisting essentially of, in % by weight, 8 to 26% MgO; 18 to 43% CaO; 25 to 40% SiO 2 ; 10 to 25% P 2 O 5 ; 10.1 to 25% Al 2 O 3 ; 0 to 3% F 2 ; 0 to 10% Li 2 O; 0 to 10% Na 2 O; 0to 10% K 2 O; 0 to 10% B 2 O 3 ; 0 to 10% TiO 2 ; 0 to 10% SrO; 0 to 10% Nb 2 O 5 ; 0 to 10% Ta 2 O 5 ; and 0 to 10% ZrO 2 ; the total amounts of MgO, CaO, SiO 2 , P 2 O 5 , Al 2 O 3 and F 2 being at least 90%.
Claim 2
Dependent Claim
138 words
A high-strength glass-ceramic having a composition consisting essentially of anorthite crystals and consisting essentially of, in % by weight, 8 to 26% MgO; 18 to 43% CaO; 25 to 40% SiO 2 ; 10 to 25% P 2 O 5 ; 10.1 to 25% Al 2 O 3 ; 0 to 3% F 2 ; 0 to 10% Li 2 O; 0 to 10% Na 2 O; 0to 10% K 2 O; 0 to 10% B 2 O 3 ; 0 to 10% TiO 2 ; 0 to 10% SrO; 0 to 10% Nb 2 O 5 ; 0 to 10% Ta 2 O 5 ; and 0 to 10% ZrO 2 ; the total amounts of MgO, CaO, SiO 2 , P 2 O 5 , Al 2 O 3 and F 2 being at least 90%.
Claim 3
Dependent Claim
142 words
A high-strength glass-ceramic consisting essentially of apatite crystals and anorthite crystals, and having a composition consisting essentially of, in % by weight, 8 to 26% MgO; 18 to 43% CaO; 25 to 40% SiO 2 ; 10 to 25% P 2 O 5 ; 10.1 to 25% Al 2 O 3 ; 0.5 to 3% F 2 ; 0 to 10% Li 2 O; 0 to 10% Na 2 O; 0 to 10% K 2 O; 0 to 10% B 2 O 3 ; 0 to 10% TiO 2 ; 0 to 10% SrO; 0 to 10% Nb 2 O 5 ; 0 to 10% Ta 2 O 5 ; and 0 to 10% ZrO 2 ; the total amount of MgO, CaO, SiO 2 , P 2 O 5 , Al 2 O 3 and F 2 being at least 90%.
Claim 4
Dependent Claim
142 words
A high-strength glass-ceramic consisting essentially of apatite crystals and anorthite crystals, and having a composition consisting essentially of, in % by weight, 8 to 26% MgO; 18 to 43% CaO; 25 to 40% SiO 2 ; 10 to 25% P 2 O 5 ; 10.1 to 25% Al 2 O 3 ; 0.5 to 3% F 2 ; 0 to 10% Li 2 O; 0 to 10% Na 2 O; 0 to 10% K 2 O; 0 to 10% B 2 O 3 ; 0 to 10% TiO 2 ; 0 to 10% SrO; 0 to 10% Nb 2 O 5 ; 0 to 10% Ta 2 O 5 ; and 0 to 10% ZrO 2 ; the total amount of MgO, CaO, SiO 2 , P 2 O 5 , Al 2 O 3 and F 2 being at least 90%.
Claim 5
Dependent Claim
29 words
The high-strength glass-ceramic as in claim 2, further containing one or more crystals selected from the group consisting of the alkaline earth metal silicate crystals and β-tricalcium phosphate crystals.
Claim 6
Dependent Claim
31 words
The high-strength glass-ceramic as in claim 3, wherein the alkaline earth metal silicate crystals are selected from the group consisting of diopside, forsterite, akermanite and mixtures thereof, and β-tricalcium phosphate crystals.
Claim 7
Dependent Claim
148 words
A high-strength glass-ceramic consisting essentially of β-tricalcium phosphate crystals, anorthite crystals and crystals of at least one from the group consisting of diopside, forsterite and akermanite and having a composition consisting essentially of, in % by weight, 8 to 26% MgO; 18 to 43% CaO; 25 to 40% SiO 2 ; 10 to 25% P 2 O 5 ; 10.1 to 25% Al 2 O 3 ; 0 to 10% Li 2 O; 0 to 10% Na 2 O; 0 to 10% K 2 O; 0 to 10% B 2 O 3 ; 0 to 10% TiO 2 ; 0 to 10% ZrO 2 ; 0 to 10% SrO; 0 to 10% Nb 2 O 5 ; and 0 to 10% Ta 2 O 5 , the total amounts of MgO, CaO, SiO 2 , P 2 O 5 and Al 2 O 3 being at least 90%.
Claim 8
Dependent Claim
148 words
A high-strength glass-ceramic consisting essentially of β-tricalcium phosphate crystals, anorthite crystals and crystals of at least one from the group consisting of diopside, forsterite and akermanite and having a composition consisting essentially of, in % by weight, 8 to 26% MgO; 18 to 43% CaO; 25 to 40% SiO 2 ; 10 to 25% P 2 O 5 ; 10.1 to 25% Al 2 O 3 ; 0 to 10% Li 2 O; 0 to 10% Na 2 O; 0 to 10% K 2 O; 0 to 10% B 2 O 3 ; 0 to 10% TiO 2 ; 0 to 10% ZrO 2 ; 0 to 10% SrO; 0 to 10% Nb 2 O 5 ; and 0 to 10% Ta 2 O 5 , the total amounts of MgO, CaO, SiO 2 , P 2 O 5 and Al 2 O 3 being at least 90%.
References Cited (Backward Citations)
US4358541A
Cited
US4560666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |