Patent US4538212A successfully refreshed from Google Patents.
US4538212A
Expired / Lapsed
US
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Electrolytic capacitor
Assignee: Vishay Sprague Inc
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Filing: 1984-07-30
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Granted: 1985-08-27
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Expires: 2004-07-30
Abstract
Abstract An electrolytic capacitor which has a porous valve-metal anode pellet, a tri-metal housing, and a hermetic glass-metal seal, has a thin layer of a ductile and solderable metal on the inner surface of the housing adjacent the seal. This layer extends from the mouth of the housing to at most the bottom of the glass-metal seal which is sealed, preferably by soldering, to the housing.
Inventors
- 👤 William P. Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:56
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/08; H01G9/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
In an electrolytic capacitor having a porous anodized valve-metal pellet anode, a hermetic glass-metal seal having a metal ring forming its periphery and a housing in the form of a can, the improvement comprises a thin layer of a ductile and solderable metal on the inner surface of the mouth of said can which extends into said can at most as far as the bottom of said seal.
Claim 2
Dependent Claim
68 words
In an electrolytic capacitor having a porous anodized valve-metal pellet anode, a hermetic glass-metal seal having a metal ring forming its periphery and a housing in the form of a can, the improvement comprises a thin layer of a ductile and solderable metal on the inner surface of the mouth of said can which extends into said can at most as far as the bottom of said seal.
Claim 3
Dependent Claim
22 words
A capacitor according to claim 1 wherein said valve-metal is tantalum and said can is at least in part made of tantalum.
Claim 4
Dependent Claim
16 words
A capacitor according to claim 2 wherein said thin layer is bonded to a tantalum surface.
Claim 5
Dependent Claim
19 words
A capacitor according to claim 2 wherein said can is a tri-metal clad can having a tantalum inner surface.
Claim 6
Dependent Claim
15 words
A capacitor according to claim 1 wherein said ring is sealed to said thin layer.
Claim 7
Dependent Claim
15 words
A capacitor according to claim 5 wherein said ring is soldered to said thin layer.
Claim 8
Dependent Claim
12 words
A capacitor according to claim 1 wherein said thin layer is copper.
Claim 9
Dependent Claim
18 words
A capacitor according to claim 1 wherein said thin metal extends only partially the depth of said seal.
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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |