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US3825802A
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US
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Solid capacitor
Assignee: AT&T Inc
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Filing: 1973-03-12
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Granted: 1974-07-23
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Expires: 1993-03-12
Abstract
Abstract An improved solid capacitor is disclosed. The capacitor comprises a porous body of compressed particles of a film-forming metal suitably doped with a dopant selected from the group comprising N, Si, P, B and mixtures thereof. An electrolytically formed dielectric oxide film of the film-forming metal covers the exposed surface of each of the particles. Impregnating the body and in intimate contact with the dielectric film is a layer of manganese dioxide. A layer of graphite overlies the layer of manganese dioxide and a metal casing encompasses the major portion of the body which is insulated therefrom and in electrical contact with the layer of graphite. Electrical lead means are attached to the porous body and the casing.
Inventors
- 👤 H Kumagai
- 👤 Knight H Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:37
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/15; C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/059; H01G9/004; H01G9/04; H01G9/048
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
The capacitor as defined in claim 1 wherein said dopant comprises nitrogen present in an amount ranging from 0.47 to 2.71 atomic percent.
Claim 2
Dependent Claim
18 words
The capacitor as defined in claim 1 wherein the dielectric film comprises an oxide of said doped tantalum.
Claim 3
Dependent Claim
29 words
The capacitor as defined in claim 3 wherein the dielectric film comprises an oxide of tantalum doped with nitrogen in an amount ranging from 0.47 to 2.71 atomic percent.
Claim 4
Dependent Claim
30 words
The capacitor as defined in claim 1 wherein the conductive means comprises a graphite layer and the manganese dioxide is formed in situ by the pyrolytic decomposition of manganous nitrate.
Claim 5
Dependent Claim
155 words
In an improved solid tantalum capacitor comprising: a. a body of compressed particles of tantalum; b. an electrolytically formed dielectric oxide film of tantalum over the exposed surface of each of the particles; c. a layer of manganese dioxide impregnating the body and in intimate contact with the dielectric film, the manganese dioxide being reducible in the presence of high fields, the tantalum metal being oxidizable upon the reduction of the manganese dioxide, thereby healing imperfections in the tantalum oxide film; d. a layer of graphite overlying the layer of manganese dioxide; e. a metal casing encompassing the major portion of the body insulated therefrom and in electrical contact with the layer of graphite; and f. electrical lead means attached to each of the body and the casing, the improvement comprising: the compressed particles in (a) above comprise tantalum doped with a dopant selected from the group consisting of N, Si, B and mixtures thereof.
Claim 6
Dependent Claim
23 words
The capacitor as defined in claim 6 wherein said dopant comprises nitrogen present in an amount ranging from 0.47 to 2.71 atomic percent.
Claim 7
Dependent Claim
18 words
The capacitor as defined in claim 7 wherein the dielectric film comprises an oxide of said doped tantalum.
References Cited (Backward Citations)
US3308350A
Cited
US3723838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |