US3249523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of electrolytically etching aluminum
Assignee: Rio Tinto Switzerland AG
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Filing: 1962-09-11
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Granted: 1966-05-03
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Expires: 1982-09-11
Abstract
No abstract record available.
Inventors
- 👤 Post Wolfgang
- 👤 Worschischek Eduard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:20
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/055; B; B23; B23H; B23H3/00; B23H3/02; B23H3/08; C; C25; C25F; C25F3/00; C25F3/02; C25F3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
THE METHOD OF ETCHING ALUMINUM TO INCREASE ITS SURFACE AREA FOR USE IN ELECTROLYTIC CAPACITOR AFTER A DIELECTRIC LAYER HAS BEEN ANODICALLY FORMED THEREON AT A VOLTAGE BELOW 100 VOLTS, WHICH COMPRISES SUBJECTING SAID ALUMINUM TO THE ACTION OF AN AQUEOUS ELECTROLYTIC SOLUTION CONTAINING ESSENTIALLY A HALOGEN COMPOUND OF THE CLASS CONSISTING OF ALKALI METAL CHLORIDES, BROMIDES, IODIDES AND CHLORATES, BY A PULSATING DIRECT CURRENT HAVING A DEGREE OF PULSATION OF LESS THAN 50%, BUT OF AT LEAST 5% AND AN AVERAGE CURRENT DENSITY OF MORE THAN 50 AMPS./ DM2, THE CONCENTRATION OF THE HALOGEN COMPOUND IN SAID SOLUTION BEING 3 MOLES PER LITER UP TO SATURATION AND THE TEMPERATURE OF SAID SOLUTION BEING BETWEEN 70*C. AND THE BOILING POINT OF SAID SOLUTION.
Claim 2
Independent Claim
123 words
THE METHOD OF ETCHING ALUMINUM TO INCREASE ITS SURFACE AREA FOR USE IN ELECTROLYTIC CAPACITOR AFTER A DIELECTRIC LAYER HAS BEEN ANODICALLY FORMED THEREON AT A VOLTAGE BELOW 100 VOLTS, WHICH COMPRISES SUBJECTING SAID ALUMINUM TO THE ACTION OF AN AQUEOUS ELECTROLYTIC SOLUTION CONTAINING ESSENTIALLY A HALOGEN COMPOUND OF THE CLASS CONSISTING OF ALKALI METAL CHLORIDES, BROMIDES, IODIDES AND CHLORATES, BY A PULSATING DIRECT CURRENT HAVING A DEGREE OF PULSATION OF LESS THAN 50%, BUT OF AT LEAST 5% AND AN AVERAGE CURRENT DENSITY OF MORE THAN 50 AMPS./ DM2, THE CONCENTRATION OF THE HALOGEN COMPOUND IN SAID SOLUTION BEING 3 MOLES PER LITER UP TO SATURATION AND THE TEMPERATURE OF SAID SOLUTION BEING BETWEEN 70*C. AND THE BOILING POINT OF SAID SOLUTION.
References Cited (Backward Citations)
GB914836A
Cited
US2930741A
Cited
US2699382A
Cited
US2755237A
Cited
US2755238A
Cited
US3085950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |