US3779879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of stripping aluminide coatings
Assignee: Curtiss Wright Corp
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Filing: 1972-12-11
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Granted: 1973-12-18
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Expires: 1992-12-11
Abstract
Abstract A process for stripping aluminide coatings from metals and alloys of the iron group, by making the article to be stripped the anode in an electrolyte comprising an oxidizing acid, at a potential not higher than 2.4 volts.
Inventors
- 👤 B Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:42
CPC Classifications
C; C25; C25F; C25F5/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
A process as recited in claim 1, wherein the oxidizing acid is at a concentration from about 40 percent to about 60 percent.
Claim 2
Dependent Claim
23 words
A process as recited in claim 2, wherein the oxidizing acid is selected from the group consisting of sulfuric acid and phosphoric acid.
Claim 3
Dependent Claim
23 words
A process as recited in claim 3, wherein the acid solution is maintained at a temperature from about 60* to about 90* .
Claim 4
Dependent Claim
17 words
A process as recited in claim 4, wherein the basis metal of the article is predominantly nickel.
Claim 5
Dependent Claim
14 words
A process as recited in claim 5, wherein the basis metal is Inconel 713C.
Claim 6
Dependent Claim
14 words
A process as recited in claim 4, wherein the basis metal is predominantly cobalt.
Claim 7
Dependent Claim
14 words
A process as recited in claim 7, wherein the basis metal is Stellite 31.
Claim 8
Dependent Claim
21 words
A process as recited in claim 1, wherein exposed basis metal becomes passivated and is not attacked by the oxidizing acid.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |