US4957827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rechargeable alkaline manganese cells with zinc anodes
Assignee: Battery Technologies Inc
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Filing: 1988-08-22
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Granted: 1990-09-18
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Expires: 2008-08-22
Abstract
Abstract A rechargeable alkaline electrochemical cell has a manganese dioxide cathode and a zinc anode. The cathode is mixed with graphite or other conductive carbon and a binder, and is contained by a metallic screen which also serves as an oxygen evolution catalyst. The screen also serves to contain the cathode in place as it tends to expand under use. A diaphram is provided to separate the cathode and anode; an alkaline electrolyte contains the cathode and anode, and the other components of the cell.
Inventors
- 👤 Karl Kordesch
- 👤 Josef Gsellmann
- 👤 Klaus Tomantschger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:27
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/34; H01M10/24; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/429; H01M2300/00; H01M2300/0002; H01M2300/0014; H01M50/44; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A rechargeable, alkaline, electrochemical cell comprising: a rechargeable manganese dioxide cathode mixed with graphite or other conductive carbon, agglomerated with a binder and contained by a metallic screen serving as an oxygen evolution catalyst carrier, and serving also to provide restrictive force against cathode expansion; a powdered zinc anode contained in a metallic basket; a separator between the cathode and the anode; and an alkaline electrolyte contacting the cathode and the anode through the screen, the basket and the separator; where said metallic basket is located at the inside of said separator, and said metallic screen is located at the outside of said separator and at the inside of said cathode.
Claim 2
Dependent Claim
111 words
A rechargeable, alkaline, electrochemical cell comprising: a rechargeable manganese dioxide cathode mixed with graphite or other conductive carbon, agglomerated with a binder and contained by a metallic screen serving as an oxygen evolution catalyst carrier, and serving also to provide restrictive force against cathode expansion; a powdered zinc anode contained in a metallic basket; a separator between the cathode and the anode; and an alkaline electrolyte contacting the cathode and the anode through the screen, the basket and the separator; where said metallic basket is located at the inside of said separator, and said metallic screen is located at the outside of said separator and at the inside of said cathode.
Claim 3
Dependent Claim
20 words
A rechargeable, alkaline electrochemical cell as claimed in claim 1, in which the screen comprises a foraminous stainless steel case.
Claim 4
Dependent Claim
18 words
A rechargeable, alkaline, electrochemical cell as claimed in claim 1, in which the cathode is molded as annulae.
Claim 5
Dependent Claim
22 words
A rechargeable, alkaline, electrochemical cell as claimed in claim 1, in which the cathode is molded as longitudinal sections of a cylinder.
Claim 6
Dependent Claim
20 words
A rechargeable, alkaline, electrochemical cell as claimed in claim 1, in which the screen includes an oxyegen overvoltage reducing catalyst.
Claim 7
Dependent Claim
21 words
A rechargeable, alkaline, electrochemical cell as claimed in claim 1 in which the separator is permeable to the passage of oxygen.
Claim 8
Dependent Claim
16 words
A rechargeable, alkaline, electrochemical cell, as claimed in claim 6, in which the separator comprises cellulose.
Claim 9
Dependent Claim
19 words
A rechargeable, alkaline electrochemical cell as claimed in claim 7, in which the separator is provided with fibrous reinforcement.
Claim 10
Dependent Claim
16 words
A rechargeable, alkaline, electrochemical cell as claimed in claim 8, in which the electrolyte is gelled.
Claim 11
Dependent Claim
22 words
A rechargeable, alkaline, electrochemical cell as claimed in claim 8, in which the electrolyte contains an overcharge reserve amount of zinc oxide.
Claim 12
Dependent Claim
19 words
A rechargeable, alkaline, electrochemical cell as claimed in claim 1, in which the electrolyte comprises an alkali metal hydroxide.
References Cited (Backward Citations)
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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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |