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US3757172A
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US
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Tantalum capacitor
Assignee: Individual
•
Filing: 1972-09-29
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Granted: 1973-09-04
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Expires: 1992-09-29
Abstract
Abstract The invention is a tantalum electrolytic capacitor in which the cathode is stainless steel and in which the electrolyte is sulfuric acid having a small amount of titanyl sulfate dissolved therein.
Inventors
- 👤 S Ruben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:30
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/04; H01G9/042; H01G9/0425
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
27 words
The capacitor described in claim 1 characterized in that the stainless steel cathode consists of approximately 18 percent chromium, 8 percent nickel and the balance principally iron.
Claim 2
Dependent Claim
19 words
The capacitor described in claim 1 characterized in that the sulfuric acid electrolyte has a saturating titanyl sulfate content.
Claim 3
Dependent Claim
13 words
The capacitor described in claim 1 characterized in that the electrolyte is immobilized.
Claim 4
Dependent Claim
52 words
An assymetrically conductive device comprising an anode which is film forming in sulfuric acid, a cathode of an iron-chromium-nickel alloy containing a preponderence of iron and the balance substantially all chromium and nickel, and an electrolyte of sulfuric acid containing as an essential ingredient thereof a small quantity of dissolved titanyl sulfate.
Claim 5
Dependent Claim
62 words
An electrolytic capacitor comprising an anode of tantalum, a cathode of stainless steel and an electrolyte comprising a mixture of a major proportion by weight of acqueous sulfuric acid solution and a minor proportion by weight of titanyl sulfate with the latter being dissolved in said acid solution in sufficient quantity to inhibit dissolution in said electrolyte of the stainless steel cathode.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |