Patent US4190878A successfully refreshed from Google Patents.
US4190878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-healing electrical capacitor
Assignee: Alcatel Lucent Deutschland AG
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Filing: 1978-06-23
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Granted: 1980-02-26
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Expires: 1998-06-23
Abstract
Abstract The disintegration of the aluminum layer in standard capacitors which takes place as a function of electric field strength is prevented by use of a thin coating which includes a small amount of evenly distributed copper. The average percentage in weight of copper in an aluminum layer is preferably between 2 and 5 percent. The coating is vapor deposited.
Inventors
- 👤 Herbert Forster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:13
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/005; H01G4/008; H01G4/015
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
55 words
In an electrical capacitor having a dielectric and an electrode aluminum coating on said dielectric and an opposed electrode, the improvement comprising a substantially evenly distributed proportion of copper in said coating, said proportion ranging between 0.5% and 10% by weight, for substantially decreasing the deterioration of said coating as a function of field strength.
Claim 2
Dependent Claim
55 words
In an electrical capacitor having a dielectric and an electrode aluminum coating on said dielectric and an opposed electrode, the improvement comprising a substantially evenly distributed proportion of copper in said coating, said proportion ranging between 0.5% and 10% by weight, for substantially decreasing the deterioration of said coating as a function of field strength.
Claim 3
Dependent Claim
20 words
A capacitor as set forth in claim 1, wherein said proportion by weight of copper is between 2% and 5%.
Claim 4
Dependent Claim
28 words
A capacitor as set forth in claim 2, herein said aluminum coating has an average weight of between 4 and 10 μg per square centimeter of said dielectric.
Claim 5
Dependent Claim
16 words
A capacitor as set forth in claim 3, wherein said aluminum coating is a vapor deposit.
Claim 6
Dependent Claim
14 words
A capacitor as set forth in claim 4, wherein said dielectric comprises plastic foil.
Claim 7
Dependent Claim
83 words
In an electrical capacitor having a dielectric area and a zinc layer on said dielectric, the improvement comprising an aluminum coating on said zinc layer, said aluminum coating having an average weight of between 4 and 10 μg per square centimeter of surface area of said zinc layer, and a substantially evenly distributed proportion of copper in said aluminum coating, said proportion ranging between 0.5% and 10% by weight, for substantially decreasing the deterioration of said coating as a function of field strength.
Claim 8
Dependent Claim
83 words
In an electrical capacitor having a dielectric area and a zinc layer on said dielectric, the improvement comprising an aluminum coating on said zinc layer, said aluminum coating having an average weight of between 4 and 10 μg per square centimeter of surface area of said zinc layer, and a substantially evenly distributed proportion of copper in said aluminum coating, said proportion ranging between 0.5% and 10% by weight, for substantially decreasing the deterioration of said coating as a function of field strength.
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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |