Patent US4292148A successfully refreshed from Google Patents.
US4292148A
Expired / Lapsed
US
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Post-treatment of etched aluminum capacitor foil
Assignee: UNITED CHEMI-CON MANUFACTURING Inc
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Filing: 1980-08-07
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Granted: 1981-09-29
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Expires: 2000-08-07
Abstract
Abstract Residual chlorides are removed from electrochemically etched aluminum foil by coupling the foil to an inert electrode having a low hydrogen overvoltage while contacting the foil with nitric acid.
Inventors
- 👤 Walter J. Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:14
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; C; C25; C25F; C25F1/00; C25F3/00; C25F3/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
47 words
A process for removing residual chlorides from electrochemically etched aluminum foil comprising coupling the foil by spaced coupling means to an electrode inert to nitric acid and having a low hydrogen overvoltage while contacting the foil with nitric acid, said electrode being cathodic to said aluminum foil.
Claim 2
Dependent Claim
47 words
A process for removing residual chlorides from electrochemically etched aluminum foil comprising coupling the foil by spaced coupling means to an electrode inert to nitric acid and having a low hydrogen overvoltage while contacting the foil with nitric acid, said electrode being cathodic to said aluminum foil.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein said inert electrode is a graphite or a platinum electrode.
Claim 4
Dependent Claim
18 words
A process according to claim 1 wherein the concentration of said nitric acid is 0.6 to 3.0 M.
Claim 5
Dependent Claim
19 words
A process according to claim 1 wherein said electrode is graphite and said nitric acid concentration is 1.0 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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |