Patent US4333993A successfully refreshed from Google Patents.
US4333993A
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Air cathode for air depolarized cells
Assignee: Duracell Inc USA
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Filing: 1981-07-10
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Granted: 1982-06-08
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Expires: 2001-07-10
Abstract
Abstract Metal/oxygen cells such as zinc/oxygen cells using air as the source of oxygen are provided with a cathode comprising a unitary member which, in a preferred embodiment, satisfies all of the diverse requirements for a cathode in this type of cell, the unitary member consisting of a hydrophobic portion and a hydrophilic portion comprising an ion exchange material which carries the desired amounts of an oxygen reduction catalyst. In a preferred embodiment, the oxygen reduction catalyst likewise serves as the current collector.
Inventors
- 👤 Henry F. Gibbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:01
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M12/00; H01M12/04; H01M12/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
90 words
A gas depolarized electrochemical cell comprising a cell casing having means allowing oxygen ingress therein, an anode and a cathode disposed in the casing, a separator interposed between the anode and cathode, a current collector and an electrolyte, said cathode consisting of a unitary member having a hydrophobic surface portion and a hydrophilic surface portion consisting of an ion-exchange portion having dispersed therein catalyst particles in an amount sufficient to carry out the desired oxygen reduction, the hydrophobic surface portion of the cathode being positioned to contact the ingressing oxygen.
Claim 2
Dependent Claim
90 words
A gas depolarized electrochemical cell comprising a cell casing having means allowing oxygen ingress therein, an anode and a cathode disposed in the casing, a separator interposed between the anode and cathode, a current collector and an electrolyte, said cathode consisting of a unitary member having a hydrophobic surface portion and a hydrophilic surface portion consisting of an ion-exchange portion having dispersed therein catalyst particles in an amount sufficient to carry out the desired oxygen reduction, the hydrophobic surface portion of the cathode being positioned to contact the ingressing oxygen.
Claim 3
Dependent Claim
24 words
The cell of claim 1 wherein the thickness of said cathode is in a range of from about 0.0005 inch to about 0.003 inch.
Claim 4
Dependent Claim
26 words
The cell of claim 1 wherein said hydrophobic surface portion is formed from a material selected from the group consisting of sintered polytetrafluoroethylene and fluoroethylenepropylene polymers.
Claim 5
Dependent Claim
11 words
The cell of claim 1 wherein said ion-exchange portion is cationic.
Claim 6
Dependent Claim
11 words
The cell of claim 1 wherein said ion-exchange portion is anionic.
Claim 7
Dependent Claim
23 words
The cell of claim 1 wherein said catalyst is a member selected from the group consisting of silver, platinum and oxides of manganese.
Claim 8
Dependent Claim
20 words
The cell of claim 1 wherein said catalyst particles are located sufficiently close together to serve as the current collector.
Claim 9
Dependent Claim
39 words
An air cathode for use in an air depolarized cell which consists of a unitary member having a hydrophobic surface portion and a hydrophilic surface portion consisting of an ion-exchange portion having dispersed therein catalyst particles to reduce oxygen.
Claim 10
Dependent Claim
39 words
An air cathode for use in an air depolarized cell which consists of a unitary member having a hydrophobic surface portion and a hydrophilic surface portion consisting of an ion-exchange portion having dispersed therein catalyst particles to reduce oxygen.
Claim 11
Dependent Claim
25 words
The air cathode of claim 8 wherein the thickness of said member is in the range of from about 0.0005 inch to about 0.003 inch.
Claim 12
Dependent Claim
27 words
The air cathode of claim 8 wherein said hydrophobic surface portion is formed from a material selected from the group consisting of sintered polytetrafluoroethylene and fluoroethylenepropylene polymers.
Claim 13
Dependent Claim
12 words
The air cathode of claim 8 wherein said ion-exchange portion is cationic.
Claim 14
Dependent Claim
12 words
The air cathode of claim 8 wherein said ion-exchange portion is anionic.
Claim 15
Dependent Claim
24 words
The air cathode of claim 8 wherein said catalyst is a member selected from the group consisting of silver, platinum and oxides of manganese.
Claim 16
Dependent Claim
26 words
The air cathode of claim 8 wherein said catalyst particles are located sufficiently close together to serve as a current collector for an air depolarized cell.
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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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |