US3847674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltaic cell with fused copper sulfide cathode
Assignee: EIDP Inc
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Filing: 1973-05-10
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Granted: 1974-11-12
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Expires: 1993-05-10
Abstract
Abstract Voltaic cell performance is improved with the use of structurally integral porous cathodes of fused cupric sulfide having a porosity of at least 40% and resistivity of less than 0.5 Ohm-cm. The cathodes are formed from a homogeneous mixture of copper and sulfur powder by compacting the powder mixture into a coherent body with mechanical pressure at a temperature below the melting point of sulfur, and then heating the coherent body at about atmospheric pressure to effect reaction of the finely divided copper and sulfur to form the fused cupric sulfide cathode structure.
Inventors
- 👤 M Kegelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:15
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/14; H01M4/00; H01M4/02; H01M4/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
IN A VOLTAIC CELL COMPRISING AN ANODE SELECTED FROM THE GROUP OF LITHIUM, SODIUM, POTASSIUM, BERYLLIUM, MAGNESIUM AND CALCIUM, A COPPER SULFIDE CATHODE AND AN ELECTROLYTE WHICH IS NON-REACTIVE TOWARD OTHER CELL COMPONENETS AND HAS A CONDUCTIVITY OF AT LEAST 10-3 OHM-1CM-1 THE IMPROVEMENT COMPRISING A POROUS CATHODE STRUCTURE CONSISTING ESSENTIALLY OF FUSED COPPER SULFIDE AND HAVING A POROSITY OF AT LEAST 40% AND A RESISTIVITY OF LESS THAN 0.5 OHM-CM.
Claim 2
Dependent Claim
71 words
IN A VOLTAIC CELL COMPRISING AN ANODE SELECTED FROM THE GROUP OF LITHIUM, SODIUM, POTASSIUM, BERYLLIUM, MAGNESIUM AND CALCIUM, A COPPER SULFIDE CATHODE AND AN ELECTROLYTE WHICH IS NON-REACTIVE TOWARD OTHER CELL COMPONENETS AND HAS A CONDUCTIVITY OF AT LEAST 10-3 OHM-1CM-1 THE IMPROVEMENT COMPRISING A POROUS CATHODE STRUCTURE CONSISTING ESSENTIALLY OF FUSED COPPER SULFIDE AND HAVING A POROSITY OF AT LEAST 40% AND A RESISTIVITY OF LESS THAN 0.5 OHM-CM.
Claim 3
Dependent Claim
39 words
The voltaic cell of claim 1 in which the fused copper sulfide cathode contains at least 75 weight percent cupric sulfide, has a porosity from about 50% to about 80% and has a resistivity of less than 0.2 ohm-cm.
Claim 4
Dependent Claim
19 words
The voltaic cell of claim 2 in which the cathode is in electrical contact with a conductive current collector.
References Cited (Backward Citations)
US3655446A
Cited
US3674560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |