US4433035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic cathode composition for air-depolarized cell and method of preparation
Assignee: Duracell Inc USA
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Filing: 1981-10-26
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Granted: 1984-02-21
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Expires: 2001-10-26
Abstract
Abstract A catalytic cathode composition and method for the preparation thereof for an air-depolarized cell, said cathode comprising carbon activated with a metal permanganate such as KMnO 4 , and an unactivated carbonaceous material such as virgin carbon black. The mixture optionally contains electrolytic MnO 2 and polytetrafluoroethylene.
Inventors
- 👤 Marian Wiacek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:54
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M12/00; H01M12/04; H01M12/06; H01M4/02; H01M4/36; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
28 words
A catalyst mix, for use as a cathode in an air depolarized cell, comprising a carbonaceous material, activated by a metal permanganate admixed with an unactivated carbonaceous material.
Claim 2
Dependent Claim
28 words
A catalyst mix, for use as a cathode in an air depolarized cell, comprising a carbonaceous material, activated by a metal permanganate admixed with an unactivated carbonaceous material.
Claim 3
Dependent Claim
16 words
The catalyst mix of claim 1 wherein said carbonaceous materials are each comprised of carbon black.
Claim 4
Dependent Claim
11 words
The catalyst mix of claim 1 wherein said metal is potassium.
Claim 5
Dependent Claim
37 words
The catalyst mix of claim 1 wherein said metal permanganate-activated carbonaceous material comprises between 5 and 80% by weight of said mix and said unactivated carbonaceous material comprises between 5 and 80% by weight of said mix.
Claim 6
Dependent Claim
24 words
The catalyst mix of claim 4 wherein said mix is further comprised of up to 40% by weight thereof of electrolytic MnO 2 .
Claim 7
Dependent Claim
24 words
The catalyst mix of claim 5 wherein said mix is further comprised of between 5 and 30% by weight thereof of an hydrophobic dispersion.
Claim 8
Dependent Claim
19 words
The catalyst mix of claim 6 wherein said hydrophobic dispersion is selected from polytetrafluoroethylene and fluorinated ethylene propylene copolymer.
Claim 9
Dependent Claim
35 words
A cathode subassembly, for an air depolarized cell, comprising a porous metal substrate having the catalyst mix of claim 1 therein and a hydrophobic film on one side thereof with said subassembly having been cured.
Claim 10
Dependent Claim
22 words
An air depolarized cell having a cathode comprised of the catalyst mix of claims 1, 2, 3, 4, 5, 6 or 7.
Claim 11
Dependent Claim
15 words
An air depolarized cell having the cathode subassembly of claim 8 as the cathode thereof.
Claim 12
Dependent Claim
17 words
The cell of claim 10 wherein said cell further contains a zinc anode and an alkaline electrolyte.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |