US4871578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxylapatite coating on metal or ceramic
Assignee: MTU Aero Engines AG
•
Filing: 1988-04-04
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Granted: 1989-10-03
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Expires: 2008-04-04
Abstract
Abstract A process for the production of a layer of hydroxyapatite (HA) on metallic and non-metallic bodies for implants is disclosed, wherein a layer of α- or β-tricalcium phosphate (TCP) is applied and this is then completely converted into pure HA by reaction with water at an elevated temperature.
Inventors
- 👤 Peter Adam
- 👤 Adolf Nebelung
- 👤 Michael Vogt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:12
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/32; A61F2/3094; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00179; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
46 words
A process for the production of a layer of hydroxylapatite (HA) on metallic and non-metallic bodies for implants, comprising the steps of: applying a layer of α- or β-tricalcium phosphate (TCP); completely converting said layer into pure HA by reaction with water at an elevated temperature.
Claim 2
Dependent Claim
46 words
A process for the production of a layer of hydroxylapatite (HA) on metallic and non-metallic bodies for implants, comprising the steps of: applying a layer of α- or β-tricalcium phosphate (TCP); completely converting said layer into pure HA by reaction with water at an elevated temperature.
Claim 3
Dependent Claim
22 words
A process according to claim 1, wherein the converting step is carried out at a temperature of from 80° to 100° C.
Claim 4
Dependent Claim
20 words
A process according to claim 1, wherein the aqueous phase has a pH value of from about 2 to 7.
Claim 5
Dependent Claim
18 words
A process according to claim 1, wherein the layer applied in the first step consists essentially of α-TCP.
Claim 6
Dependent Claim
23 words
A process according to claim 1, wherein the TCP layer is applied by thermal spraying, vacuum deposition or sputtering with α- or β-TCP.
Claim 7
Dependent Claim
12 words
A process according to claim 2, wherein the layer consists of α-TCP.
Claim 8
Dependent Claim
17 words
A process according to claim 2, wherein the water has a pH from about 2 to 7.
Claim 9
Dependent Claim
18 words
A process according to claim 7, wherein the layer applied in the first step consists essentially of α-TCP.
Claim 10
Dependent Claim
12 words
A process according to claim 1, consisting essentially of the recited steps.
Claim 11
Dependent Claim
10 words
An implant produced by the process according to claim 1.
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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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |