US3193485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic treatment of aluminium for increasing the effective surface
Assignee: GE Healthcare UK Ltd
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Filing: 1964-05-28
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Granted: 1965-07-06
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Expires: 1984-05-28
Abstract
No abstract record available.
Inventors
- 👤 Vincent Russell Swale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:35
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/055; C; C25; C25F; C25F3/00; C25F3/02; C25F3/04; Y; Y10; Y10S; Y10S204/00; Y10S204/08; Y10S204/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE METHOD OF ELECTROLYTICALLY INCREASING THE SURFACE AREA OF ALUMINUM FOIL WHICH COMPRISES ADVANCING SAID FOIL CONTINUOUSLY THROUGH AN ELECTROLYTIC CELL HAVING A CATHODE AND AN AQUEOUS ETCHING ELECTROLYTE, AND PASSING A CURRENT BETWEEN SAID FOIL AND SAID CATHODE AT AN AVERAGE CURRENT DENSITY OF BETWEEN 1.2 A. AND 4.0 A. PER SQUARE INCH, APPLYING AN ASYMMETRICAL ALTERNATING VOLTAGE AT A FREQUENCY IN THE HECTOCYCLE RANGE OF SAID FOIL SUCH THAT DURING AT LEAST TWO-THIRDS OF EACH CYCLE THE VOLTAGE IS POSITIVE-GOING WITH RESPECT TO THE FOIL FORMING THE ANODE, SUCCESSIVE POSITIVE-GOING VOLTAGE PULSES OF AN AMPLITUDE OF ABOUT SEVENTY VOLTS BEING SEPARATED BY SHORT NEGATIVEGOING PULSES OF AN AMPLITUDE OF AT LEAST 0.1 VOLT AND LESS THAN ONE-TENTH OF THE AMPLITUDE OF THE POSITIVE-GOING PULSES, SUCH THAT THE SURFACE OF THE FOIL BECOMES ETCHED THEREBY PROVIDING A FOIL HAVING AN ENLARGED SURFACE AREA.
Claim 2
Independent Claim
144 words
THE METHOD OF ELECTROLYTICALLY INCREASING THE SURFACE AREA OF ALUMINUM FOIL WHICH COMPRISES ADVANCING SAID FOIL CONTINUOUSLY THROUGH AN ELECTROLYTIC CELL HAVING A CATHODE AND AN AQUEOUS ETCHING ELECTROLYTE, AND PASSING A CURRENT BETWEEN SAID FOIL AND SAID CATHODE AT AN AVERAGE CURRENT DENSITY OF BETWEEN 1.2 A. AND 4.0 A. PER SQUARE INCH, APPLYING AN ASYMMETRICAL ALTERNATING VOLTAGE AT A FREQUENCY IN THE HECTOCYCLE RANGE OF SAID FOIL SUCH THAT DURING AT LEAST TWO-THIRDS OF EACH CYCLE THE VOLTAGE IS POSITIVE-GOING WITH RESPECT TO THE FOIL FORMING THE ANODE, SUCCESSIVE POSITIVE-GOING VOLTAGE PULSES OF AN AMPLITUDE OF ABOUT SEVENTY VOLTS BEING SEPARATED BY SHORT NEGATIVEGOING PULSES OF AN AMPLITUDE OF AT LEAST 0.1 VOLT AND LESS THAN ONE-TENTH OF THE AMPLITUDE OF THE POSITIVE-GOING PULSES, SUCH THAT THE SURFACE OF THE FOIL BECOMES ETCHED THEREBY PROVIDING A FOIL HAVING AN ENLARGED SURFACE AREA.
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) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |