US3601665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitors having a self-depolarizing electrolyte
Assignee: CHARLES W WALTERS
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Filing: 1969-09-29
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Granted: 1971-08-24
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Expires: 1989-09-29
Abstract
Abstract A capacitor is provided comprising an anode made of tantalum or niobium, a silver cathode spaced from the anode and an electrolyte in contact with the anode and cathode, the electrolyte comprising an aqueous acid solution of sulfuric acid; silver sulfate at least partially dissolved in the acid solution and at least one metal sulfate selected from chromium, vanadium, manganese and iron also at least partially dissolved in the acid solution.
Inventors
- 👤 Thomas C O'nan
- 👤 Charles W Walters
- 👤 James M Booe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:05
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
40 words
A capacitor according to claim 1 in which said metal sulfate is at least in part the reaction product obtained from the reduction of at least one oxidizing addition agent which is at least partially soluble in said acid solution.
Claim 2
Dependent Claim
29 words
A capacitor according to claim 2 in which said addition agent is selected from the group consisting of metal oxides and salts thereof which are soluble in said electrolyte.
Claim 3
Dependent Claim
14 words
A capacitor according to claim 2 in which said solution also contains oxide material.
Claim 4
Dependent Claim
12 words
A capacitor according to claim 2 in which said cathode is etched.
Claim 5
Dependent Claim
13 words
A capacitor according to claim 1 which has increased capacitance stability during operation.
Claim 6
Dependent Claim
20 words
A capacitor according to claim 2 in which said addition agent is a duplex salt, containing more than one metal.
References Cited (Backward Citations)
US1684684A
Cited
US1658914A
Cited
GB405151A
Cited
US2616953A
Cited
US2910633A
Cited
US2871424A
Cited
US2778979A
Cited
US3296500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |