Patent US4237195A successfully refreshed from Google Patents.
US4237195A
Expired / Lapsed
US
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Porous electrode
Assignee: Electrochemische Energieconversie NV
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Filing: 1978-06-20
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Granted: 1980-12-02
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Expires: 1998-06-20
Abstract
Abstract An improved porous electrode for use in electrochemical cells, particularly for use in fuel cells. The electrode is of the kind comprising a porous layer containing carbon and a non-polar resin such as polytetrafluoroethylene, and an electrically conducting screen acting as a collector. To prevent early collector deterioration the collector material is covered with an electrically conductive protective layer, which consists either of an electrically conductive resin or of a non-conductive resin in which conductive particles, such as graphite particles, have been incorporated.
Inventors
- 👤 Marinus Alfenaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:01
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
42 words
A porous electrode comprising a porous layer containing carbon and a non-polar resin and an electrically conductive fluid-permeable screen or grid acting as a collector, wherein the entire surface of the collector material is covered with an electrically conductive collector-covering resin layer.
Claim 2
Dependent Claim
42 words
A porous electrode comprising a porous layer containing carbon and a non-polar resin and an electrically conductive fluid-permeable screen or grid acting as a collector, wherein the entire surface of the collector material is covered with an electrically conductive collector-covering resin layer.
Claim 3
Dependent Claim
13 words
An electrode as claimed in claim 1, wherein the non-polar resin is polytetrafluoro-ethylene.
Claim 4
Dependent Claim
16 words
An electrode as claimed in claim 1, wherein the collector-covering layer contains an electrically conductive resin.
Claim 5
Dependent Claim
25 words
An electrode as claimed in claim 1, wherein the collector-covering layer consists of a non-electrically conductive resin in which electrically conductive particles have been incorporated.
Claim 6
Dependent Claim
15 words
An electrode as claimed in claim 4, wherein the electrically conducting particles are carbon particles.
Claim 7
Dependent Claim
14 words
An electrode as claimed in claim 5, wherein the carbon particles are graphite particles.
Claim 8
Dependent Claim
15 words
An electrode as claimed in claim 4, wherein the electrically conductive particles are metal particles.
Claim 9
Dependent Claim
21 words
An electrode as claimed in claim 4, wherein the diameter of the electrically conductive particles is from 0.1 to 50 μm.
Claim 10
Dependent Claim
21 words
An electrode as claimed in claim 8, wherein the diameter of the electrically conductive particles is from 0.1 to 5 μm.
Claim 11
Dependent Claim
17 words
An electrode as claimed in claim 4, wherein the electrically conductive particles have the form of fibres.
Claim 12
Dependent Claim
23 words
An electrode as claimed in claim 1, wherein the resin in the collector-covering layer is at least to some extent elastic in character.
Claim 13
Dependent Claim
18 words
An electrode as claimed in claim 4, wherein the resin in the covering layer is an epoxy resin.
Claim 14
Dependent Claim
24 words
An electrode as claimed in claim 4, wherein the resin in the covering layer is a polyurethane, polyvinyl chloride, chlorinated rubber or chlorinated polyethylene.
Claim 15
Dependent Claim
31 words
An electrode as claimed in claim 4, wherein the concentration of the electrically conducting particles in the resin is 10-75% by wt. based on the resin plus the electrically conducting particles.
Claim 16
Dependent Claim
31 words
An electrode as claimed in claim 14, wherein the concentration of the electrically conductive particles in the resin is 50-70% by wt. based on the resin plus the electrically conductive particles.
Claim 17
Dependent Claim
20 words
An electrode as claimed in claim 1, wherein the thickness of the covering layer is from 5 to 50 μm.
Claim 18
Dependent Claim
20 words
An electrode as claimed in claim 16, wherein the thickness of the covering layer is from 10 to 20 μm.
Claim 19
Dependent Claim
13 words
An electrochemical cell containing one or more electrodes as claimed in claim 1.
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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |