Patent US4292383A successfully refreshed from Google Patents.
US4292383A
Expired / Lapsed
US
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Bilevel rechargeable cell
Assignee: DURCELL INTERNATIONAL Inc A CORP OF DE
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Filing: 1979-11-21
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Granted: 1981-09-29
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Expires: 1999-11-21
Abstract
Abstract A cell having an anode, a cathode, barrier means between the cathode and anode, and an electrolyte in contact with all the elements of the cell, the cathode being formed from a mixture of monovalent silver oxide and nickel. The cathode can also be formed from a mixture of monovalent silver oxide, a material such as mercuric oxide, and silver, nickel or a mixture of silver and nickel.
Inventors
- 👤 Ralph Di Palma
- 👤 Arthur Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:48
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M10/00; H01M10/24; H01M10/32; H01M4/24; H01M4/34; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
A method for improving the rechargeability of an electrochemical cell having an anode, a separator, an electrolyte, and a cathode comprising monovalent silver oxide comprising the steps of admixing with said silver oxide a material selected from the group consisting of mercuric oxide, cadmium oxide, cadmium hydroxide and manganese dioxide; and substantially homogeneously dispersing above about ten percent by weight of the cathode of a metal selected from the group consisting of silver, nickel and a mixture of silver and nickel throughout said cathode; whereby, upon discharging of said cell a stepped decrease in cell voltage occurs and recharging of said said cell can be effected prior to complete discharge of said cathode whereby a matrix of said metal will be maintained in said cathode to improve the rechargeability of said cathode.
Claim 2
Independent Claim
132 words
A method for improving the rechargeability of an electrochemical cell having an anode, a separator, an electrolyte, and a cathode comprising monovalent silver oxide comprising the steps of admixing with said silver oxide a material selected from the group consisting of mercuric oxide, cadmium oxide, cadmium hydroxide and manganese dioxide; and substantially homogeneously dispersing above about ten percent by weight of the cathode of a metal selected from the group consisting of silver, nickel and a mixture of silver and nickel throughout said cathode; whereby, upon discharging of said cell a stepped decrease in cell voltage occurs and recharging of said said cell can be effected prior to complete discharge of said cathode whereby a matrix of said metal will be maintained in said cathode to improve the rechargeability of said cathode.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein said metal comprises silver.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein said metal comprises nickel.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein said cathode contains said metal in an amount sufficient to improve the rechargeability of said cathode.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein said cathode contains said metal in an amount up to about forty percent by weight of the cathode.
Claim 7
Dependent Claim
28 words
The method of claim 1 wherein said cathode contains said material in an amount of from about twenty percent to about sixty percent by weight of the cathode.
Claim 8
Dependent Claim
14 words
The method of claim 6 wherein said anode further comprises mercury and zinc oxide.
Claim 9
Dependent Claim
10 words
The method of claim 1 wherein said anode comprises zinc.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |