US2853445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of etching aluminum foil for electrolytic capacitor
Assignee: Aerovox Corp
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Filing: 1956-04-06
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Granted: 1958-09-23
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Expires: 1976-04-06
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Catotti
- 👤 Cohn Hans
- 👤 Peter P Grad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:32
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/055; C; C25; C25F; C25F3/00; C25F3/02; C25F3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
THE PROCESS OF ETCHING ALUMINUM FOIL CONTAINING SMALL AMOUNTS OF IMPURITIES, WHEREIN VARIATION IN THE DEGREE OF ETCHING OBTAINED DUE TO VARIATION OF THE AMOUNT OF IMPURITIES IN SAID FOIL IS REDUCED, COMPRISING THE STEPS OF CONNECTING AN ELECTRICAL CONDUCTOR BETWEEN SAID FOIL AND AN ELECTRODE SPACED THEREFROM, SAID ELECTRODE COMPRISING AN ELEMENT MORE NOBLE THAN ALUMINUM AND INSOLUBLE IN THE ETCH SOLUTION, WHILE MAINTAINING SAID FOIL AND SAID ELECTRODE IN CONTACT WITH SAID ETCH SOLUTION, SAID SOLUTION COMPRISING AN AQUEOUS SOLUTION OF A MINERAL ACID AND A SALT OF SAID ACID, THE CATION OF SAID SALT BEING IN THE HIGHER OF TWO SOLUBLE OXIDATION STATES.
Claim 2
Dependent Claim
106 words
THE PROCESS OF ETCHING ALUMINUM FOIL CONTAINING SMALL AMOUNTS OF IMPURITIES, WHEREIN VARIATION IN THE DEGREE OF ETCHING OBTAINED DUE TO VARIATION OF THE AMOUNT OF IMPURITIES IN SAID FOIL IS REDUCED, COMPRISING THE STEPS OF CONNECTING AN ELECTRICAL CONDUCTOR BETWEEN SAID FOIL AND AN ELECTRODE SPACED THEREFROM, SAID ELECTRODE COMPRISING AN ELEMENT MORE NOBLE THAN ALUMINUM AND INSOLUBLE IN THE ETCH SOLUTION, WHILE MAINTAINING SAID FOIL AND SAID ELECTRODE IN CONTACT WITH SAID ETCH SOLUTION, SAID SOLUTION COMPRISING AN AQUEOUS SOLUTION OF A MINERAL ACID AND A SALT OF SAID ACID, THE CATION OF SAID SALT BEING IN THE HIGHER OF TWO SOLUBLE OXIDATION STATES.
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) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |