US4983182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic implant and process for its production
Assignee: Mitsubishi Chemical Corp
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Filing: 1989-02-08
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Granted: 1991-01-08
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Expires: 2009-02-08
Abstract
Abstract A ceramic implant comprising a sintered body of zirconia and a coating layer of a porous sintered body of a mixture comprising α-tricalcium phosphate and zirconia, or hydroxyapatite and zirconia formed on the surface of the sintered body of zirconia.
Inventors
- 👤 Naoto Kijima
- 👤 Yasuo Oguri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:42
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; A; A61; A61C; A61C8/00; A61C8/0012; A61F; A61F2/00; A61F2/02; A61F2/28; A61L; A61L27/00; A61L27/02; A61L27/10; A61L27/28; A61L27/30; A61L27/32; B; B32; B32B; B32B18/00; C04B35/00; C04B35/01; C04B35/48; C04B35/486; C04B41/009; C04B41/45; C04B41/50; C04B41/5076; C04B41/5092; A61C8/0013; A61F2310/00; A61F2310/00389; A61F2310/00592; A61F2310/00796; C04B2111/00; C04B2111/00474; C04B2111/00836; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/345; C04B2237/348
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
34 words
A ceramic implant comprising a sintered body of zirconia and a coating layer of a porous sintered body of a mixture comprising hydroxyapatite and zirconia on the surface of the sintered body of zirconia.
Claim 2
Dependent Claim
34 words
A ceramic implant comprising a sintered body of zirconia and a coating layer of a porous sintered body of a mixture comprising hydroxyapatite and zirconia on the surface of the sintered body of zirconia.
Claim 3
Dependent Claim
22 words
The ceramic implant according to claim 1, wherein the weight ratio of zirconia to hydroxyapatite is within the range of from 0.5-20.
Claim 4
Dependent Claim
22 words
The ceramic implant according to claim 1, wherein the weight ratio of zirconia to hydroxyapatite is within the range of from 0.1-2.5.
Claim 5
Dependent Claim
31 words
The ceramic implant according to claim 1, wherein the sintered body of zirconia has a flexural strength of at least 100 kgf/mm 2 and a Weibull coefficient of at least 10.
Claim 6
Dependent Claim
31 words
The ceramic implant according to claim 1, wherein the sintered body of zirconia has a flexural strength of at least 120 kgf/mm 2 and a Weibull coefficient of at least 15.
Claim 7
Dependent Claim
31 words
The ceramic implant according to claim 2, wherein the sintered body of zirconia has a flexural strength of at least 100 kgf/mm 2 and a Weibull coefficient of at least 10.
Claim 8
Dependent Claim
31 words
The ceramic implant according to claim 3, wherein the sintered body of zirconia has a flexural strength of at least 120 kgf/mm 2 and a Weibull coefficient of at least 15.
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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |