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US4337114A
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Nodular copper removal from aluminum foil surfaces
Assignee: UNITED CHEMI-CON MANUFACTURING Inc
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Filing: 1980-10-29
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Granted: 1982-06-29
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Expires: 2000-10-29
Abstract
Abstract Nodular copper is dissolved from aluminum foil surfaces by contacting the aluminum with a 0.1 to 2 M ammonium persulfate solution. The contacting temperature is 20 DEG to 40 DEG C., preferably 30 DEG C., and the contacting time is 1 to 10 minutes, preferably 2 minutes.
Inventors
- 👤 Philip G. Russell
- 👤 Walter J. Bernard
- 👤 Sidney D. Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:32
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/18; H; H01; H01G; H01G9/00; H01G9/004; H01G9/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
A process for removing nodular copper from the surface of etched aluminum foil comprises contacting said foil bearing a thin uniform copper layer and nodular copper with a 0.1 to 2.0 M ammonium persulfate solution to selectively dissolve said nodular copper and leave said uniform layer.
Claim 2
Dependent Claim
46 words
A process for removing nodular copper from the surface of etched aluminum foil comprises contacting said foil bearing a thin uniform copper layer and nodular copper with a 0.1 to 2.0 M ammonium persulfate solution to selectively dissolve said nodular copper and leave said uniform layer.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein the temperature at which said contacting takes place at 20° to 40° C.
Claim 4
Dependent Claim
12 words
A process according to claim 2 wherein said temperature is 30° C.
Claim 5
Dependent Claim
17 words
A process according to claim 2 wherein the duration of said contacting is 1 to 10 minutes.
Claim 6
Dependent Claim
12 words
A process according to claim 4 wherein said duration is 2 minutes.
Claim 7
Dependent Claim
14 words
A process according to claim 1 wherein said ammonium persulfate solution is 0.8 M.
References Cited (Backward Citations)
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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) | 1985-06-28 | 1985-12-28 | 1986-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-28 | 1989-12-28 | 1990-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-28 | 1993-12-28 | 1994-06-29 | $7700.00 | Window Closed / Lapsed |