US3666642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming aluminum foil
Assignee: General Electric Co
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Filing: 1971-03-19
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Granted: 1972-05-30
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Expires: 1991-03-19
Abstract
Abstract AN ALUMINUM FOIL OF CONTROLLED AND UNIFORM POROSITY IS PROVIDED. THE POROUS FOIL IS MADE BY A PROCESS COMPRISING A FIRST ETCHING OF THE FOIL, AN OXIDATION STEP, AND A SUBSEQUENT ELECTRACHEMICAL ETCHING OF PREVIOUSLY EACHED AND OXIDIZED FOIL. THE POROUS ALUMINUM FOIL OT THE INVENTION IS PARTICULARLY USEFUL IN THE CONSTRUCTION OF DOUBLE ANODE ELECTROLYTIC CAPACITORS.
Inventors
- 👤 Abdul Sahib Alwan
- 👤 Ralph Antonio Ruscetta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:01
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12479
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |