US3671407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing high-temperature blistering of copper coatings electro-deposited on copper substrates
Assignee: United States Steel Corp
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Filing: 1970-09-11
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Granted: 1972-06-20
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Expires: 1990-09-11
Abstract
Abstract A method for preparing the surface of copper substrates by anodically dissolving the surface, for a time and depth sufficient to substantially decrease higher local oxygen content of the surface and thereby improve the adhesion of electrodeposited copper coatings. More specifically, the surface pretreatment provides a base for an electrodeposited copper coating with enhanced resistance to blistering and peeling at temperatures in excess of 700* F.
Inventors
- 👤 Colin B Hamilton
- 👤 Edward J Oles Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:23
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34; B; B22; B22C; B22C23/00; B22C23/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
The method of claim 1, wherein said base article has a bulk oxygen content greater than about 100 ppm, and said depth of dissolution is greater than 0.2 mils.
Claim 2
Dependent Claim
29 words
The method of claim 1, wherein said plating is conducted to recondition said copper base article, and is accomplished by the electrodeposition of a layer consisting essentially of copper.
Claim 3
Dependent Claim
28 words
The method of claim 3, wherein the resistance to said failures is enhanced by employing a base article with a bulk oxygen content of less than 100 ppm.
Claim 4
Dependent Claim
39 words
The method of claim 3, wherein said base article has a bulk oxygen content less than about 600 ppm, and the enhancement of resistance to failure is insured by the dissolution of at least 1.0 mil of metal surface.
Claim 5
Dependent Claim
14 words
The method of claim 3, wherein said copper base article is a casting mold.
Claim 6
Dependent Claim
37 words
The method of claim 3, wherein said depth of dissolution for a service temperature greater than 1,300* F., is at least 0.18 mils and is greater than that represented by the 1,300* F. line of FIG. 2.
Claim 7
Dependent Claim
29 words
The method of claim 7, wherein said base article has a bulk oxygen content greater than about 100 ppm, and said depth of dissolution is greater than 0.4 mils.
References Cited (Backward Citations)
US2461228A
Cited
US1995200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |