Patent US3144328A successfully refreshed from Google Patents.
US3144328A
Expired / Lapsed
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Method of producing porous sintered tantalum anodes
Assignee: Duracell Inc USA
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Filing: 1960-05-17
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Granted: 1964-08-11
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Expires: 1980-05-17
Abstract
No abstract record available.
Inventors
- 👤 Arnold S Doty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:34
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/052
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD OF PROVIDING SINTERED TANTALUMANODES HAVING A DENSITY IN THE RANGE OF FROM 4.5 TO 9.5 GMS./CC. COMPRISING THE STEPS OF POURING TANTALUM POWDER LOOSELY INTO A SUITABLE CAVITY IN A GRAPHITE BLOCK, PRESINTERING THE POWDER AT A TEMPERATURE OF FROM 1500-1600*C. FOR A PERIOD OF 30 TO 60 MINUTES SO AS TO PRODUCE A COHERENT COMPACT, SAID PRESINTERING TAKING PLACE IN AN INERT ATMOSPHERE, COOLING THE COMPACT TO ROOM TEMPERATURE, TRANSFERRING THE COMPACT TO A TANTALUM CONTAINER, AND SINTERING THE SME AT A TEMPERATURE OF FROM 1900-2100* C. IN AN INERT ATMOSPHERE SO AS TO OBTAIN AN ANODE HAVING A CAPACITANCE OF APPROXIMATELY 2260 UFV./GM. AND AN EQUIVALENT SERIES RESISTANCE OF FROM .77 TO .90 OHM.
Claim 2
Independent Claim
118 words
A METHOD OF PROVIDING SINTERED TANTALUMANODES HAVING A DENSITY IN THE RANGE OF FROM 4.5 TO 9.5 GMS./CC. COMPRISING THE STEPS OF POURING TANTALUM POWDER LOOSELY INTO A SUITABLE CAVITY IN A GRAPHITE BLOCK, PRESINTERING THE POWDER AT A TEMPERATURE OF FROM 1500-1600*C. FOR A PERIOD OF 30 TO 60 MINUTES SO AS TO PRODUCE A COHERENT COMPACT, SAID PRESINTERING TAKING PLACE IN AN INERT ATMOSPHERE, COOLING THE COMPACT TO ROOM TEMPERATURE, TRANSFERRING THE COMPACT TO A TANTALUM CONTAINER, AND SINTERING THE SME AT A TEMPERATURE OF FROM 1900-2100* C. IN AN INERT ATMOSPHERE SO AS TO OBTAIN AN ANODE HAVING A CAPACITANCE OF APPROXIMATELY 2260 UFV./GM. AND AN EQUIVALENT SERIES RESISTANCE OF FROM .77 TO .90 OHM.
References Cited (Backward Citations)
US2157596A
Cited
US2904430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |