Patent US3997339A successfully refreshed from Google Patents.
US3997339A
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Aluminum alloy foil for high voltage electrolytic capacitors
Assignee: Siemens AG
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Filing: 1975-01-16
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Granted: 1976-12-14
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Expires: 1995-01-16
Abstract
Abstract An aluminum alloy foil for a high voltage electrolytic capacitor in which the foil contains one or more of the elements, antimony, barium, and zinc in quantities 5 to 200 ppm. and at the most 0.5 ppm. of lead and bismuth plus at the most 2 ppm. of calcium and chromium. The resulting foil has a greatly improved etching pore density.
Inventors
- 👤 Horst Fickelscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:29
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H01G9/045; H01G9/048; H01G9/055
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
An electrolytically etched aluminum alloy foil for a high voltage electrolytic capacitor comprising an aluminum foil containing an item selected from the group consisting of antimony, barium, and zinc in quantities of 5 to 220 ppm, an item selected from the group consisting of lead and bismuth in quantities of up to 0.5 ppm and an item selected from the group consisting of calcium and chromium in quantities of up to 2 ppm, the barium of said group of antimony, barium, and zinc being present in quantities of 20 to 50 ppm.
Claim 2
Dependent Claim
92 words
An electrolytically etched aluminum alloy foil for a high voltage electrolytic capacitor comprising an aluminum foil containing an item selected from the group consisting of antimony, barium, and zinc in quantities of 5 to 220 ppm, an item selected from the group consisting of lead and bismuth in quantities of up to 0.5 ppm and an item selected from the group consisting of calcium and chromium in quantities of up to 2 ppm, the barium of said group of antimony, barium, and zinc being present in quantities of 20 to 50 ppm.
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) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |