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US4911953A
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Process for producing composite materials having a coating of calcium phosphate compound
Assignee: De Nora Permelec Ltd
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Filing: 1988-09-29
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Granted: 1990-03-27
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Expires: 2008-09-29
Abstract
Abstract A process for producing a composite material having a coating of a calcium phosphate compound on the surface of a metal substrate, said process comprising the steps of applying a coating solution of an organic calcium compound and an organophosphorus compound in an organic solvent to the surface of said metal substrate, and firing the applied solution to form a coated layer of a calcium phosphate compound on the surface of said metal substrate.
Inventors
- 👤 Masashi Hosonuma
- 👤 Takayuki Shimamune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/32; C; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1229; C23C18/1241; C23C18/125; C23C18/1279; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/30767; A61F2002/30906; A61F2310/00; A61F2310/00005; A61F2310/00011; A61F2310/00023; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A process for producing a composite material having a coating of a calcium phosphate compound on the surface of a metal substrate, said process comprising the steps of applying a coating solution of an organic calcium compound and an organophosphorus compound dissolved in an water miscible organic solvent to the surface of said metal substrate, and firing the applied solution to form a coated layer of a calcium phosphate compound on the surface of said metal substrate.
Claim 2
Dependent Claim
77 words
A process for producing a composite material having a coating of a calcium phosphate compound on the surface of a metal substrate, said process comprising the steps of applying a coating solution of an organic calcium compound and an organophosphorus compound dissolved in an water miscible organic solvent to the surface of said metal substrate, and firing the applied solution to form a coated layer of a calcium phosphate compound on the surface of said metal substrate.
Claim 3
Dependent Claim
33 words
A process according to claim 1, wherein said metal substrate is made of a metal or an alloy selected from the group consisting of titanium, titanium alloys, stainless steel and a cobalt-chromium alloy.
Claim 4
Dependent Claim
32 words
A process according to claim 1, wherein said coating solution contains water or a dilute aqueous solution of nitric acid so that hydroxyapatite will be chiefly produced as the calcium phosphate compound.
Claim 5
Dependent Claim
14 words
A process according to claim 1, wherein said organic calcium compound is calcium 2-ethylhexanoate.
Claim 6
Dependent Claim
13 words
A process according to claim 1, wherein said organophosphorus compound is di(2-ethylhexyl) phosphate.
Claim 7
Dependent Claim
13 words
A process according to claim 1, wherein said organic solvent is n-butyl alcohol.
Claim 8
Dependent Claim
31 words
A process according to claim 1, wherein said process additionally includes removing carbon dioxide from the system either before, during the firing step or both before and during the firing step.
Claim 9
Dependent Claim
18 words
A process according to claim 1, wherein the firing is at a temperature between 300° and 900° C.
Claim 10
Dependent Claim
15 words
A process according to claim 1, wherein the firing is performed in an oxidizing atmosphere.
Claim 11
Dependent Claim
23 words
A process according to claim 1, wherein the process additionally includes removing any remaining carbon after the firing by burning with a flame.
Claim 12
Dependent Claim
46 words
A process according to claim 1, wherein the process additionally includes hydrothermally treating the substrate having the coating layer of a calcium phosphate compound formed on its surface by the firing step at 100° to 200° C. in steam so as to modify said coating layer.
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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |