Patent US2900579A successfully refreshed from Google Patents.
US2900579A
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US
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Tantalum wire capacitors
Assignee: Sprague Electric Co
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Filing: 1954-10-04
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Granted: 1959-08-18
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Expires: 1974-10-04
Abstract
No abstract record available.
Inventors
- 👤 Donald G Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:44
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/008; H01G9/012; Y; Y10; Y10T; Y10T29/00; Y10T29/43
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN A MINIATURE ELECTROLYTIC CAPACITOR HAVING A CAPACITANCE MEASURED IN MICROFARADS, A TUBULAR SILVER CAN OF THE ORDER OF 1/8 INCH IN DIAMETER, 1/2 INCH IN LENGTH AND 6 MILS IN THICKNESS, A STRAIGHT TANTALUM ANODE AXIALLY POSITIONED IN SAID CAN COMPOSED OF A WIRE OF 10 TO 50 MILS IN DIAMETER, AN ETCHED SURFACE ON SAID STRAIGHT WIRE ANODE PROVIDING AN ANODE SURFACE TO SAID CAPACITOR WHEREBY SAID MINIATURE CAPACITOR HAS SAID CAPACITANCE, AN ELECTROLYTE IN SAID CAN OCCUPYING A VOLUME SUBSTANTIALLY GREATER THAN THE VOLUME OCCUPIED BY SAID TANTALUM WIRE
Claim 2
Dependent Claim
92 words
IN A MINIATURE ELECTROLYTIC CAPACITOR HAVING A CAPACITANCE MEASURED IN MICROFARADS, A TUBULAR SILVER CAN OF THE ORDER OF 1/8 INCH IN DIAMETER, 1/2 INCH IN LENGTH AND 6 MILS IN THICKNESS, A STRAIGHT TANTALUM ANODE AXIALLY POSITIONED IN SAID CAN COMPOSED OF A WIRE OF 10 TO 50 MILS IN DIAMETER, AN ETCHED SURFACE ON SAID STRAIGHT WIRE ANODE PROVIDING AN ANODE SURFACE TO SAID CAPACITOR WHEREBY SAID MINIATURE CAPACITOR HAS SAID CAPACITANCE, AN ELECTROLYTE IN SAID CAN OCCUPYING A VOLUME SUBSTANTIALLY GREATER THAN THE VOLUME OCCUPIED BY SAID TANTALUM WIRE
References Cited (Backward Citations)
US2029451A
Cited
US2066912A
Cited
US2113126A
Cited
US2290163A
Cited
US2368688A
Cited
US2616953A
Cited
US2841771A
Cited
US2667606A
Cited
US2758258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |