US4323950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic capacitor with high-purity aluminized cathode
Assignee: Sprague Electric Co
•
Filing: 1979-10-31
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Granted: 1982-04-06
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Expires: 1999-10-31
Abstract
Abstract An electrolytic capacitor has a cathode electrode produced by depositing aluminum on a porous high surface-area dielectric substrate as a layer at least 2000 A thick on each surface.
Inventors
- 👤 Walter J. Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:38
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/042; H01G9/0425
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
An electrolytic capacitor comprising a pair of convolutely wound electrodes with interleaved spacers in contact with an electrolyte, one of said electrodes being an anode and bearing a barrier dielectric oxide on the surface thereof, the other of said electrodes being a cathode of at least one sheet of a porous, non-calendered, high surface-area continuous substrate onto which aluminum has been deposited other than by spraying in a layer of about 2000 A to 5000 A thickness on each surface of said substrarte to provide a continuous high-purity cathode strip.
Claim 2
Dependent Claim
90 words
An electrolytic capacitor comprising a pair of convolutely wound electrodes with interleaved spacers in contact with an electrolyte, one of said electrodes being an anode and bearing a barrier dielectric oxide on the surface thereof, the other of said electrodes being a cathode of at least one sheet of a porous, non-calendered, high surface-area continuous substrate onto which aluminum has been deposited other than by spraying in a layer of about 2000 A to 5000 A thickness on each surface of said substrarte to provide a continuous high-purity cathode strip.
Claim 3
Dependent Claim
12 words
A capacitor according to claim 1 wherein said substrate is Manila paper.
Claim 4
Dependent Claim
18 words
A capacitor according to claim 2 wherein said metallized layer is about 2000 A to 3000 A thickness.
Claim 5
Dependent Claim
15 words
A capacitor according to claim 1 wherein said aluminum is vacuum deposited on said substrate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |