Patent US3770509A successfully refreshed from Google Patents.
US3770509A
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Duplex gas diffusion electrodes with gas diffusion means
Assignee: VARTA AG
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Filing: 1967-11-22
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Granted: 1973-11-06
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Expires: 1987-11-22
Abstract
Abstract A multilayered gas diffusion unitary electrode body for an electrochemical apparatus, fuel cell elements and electrolysis cell, said gas diffusion electrode having two catalytically active layers and comprising two electrode parts, each part having at least two layers, said parts being bonded to each other into a unitary construction by a bonding or connecting middle layer which joins the respective larger pore layers of the respective electrode parts, said bonding layer comprising a resin or resin coated metal foil or web. A fuel cell battery comprising such multilayered electrodes. A method for bonding the electrode to give the structure described.
Inventors
- 👤 A Winsel
- 👤 G Stempel
- 👤 H Gruene
- 👤 K Weidinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:35
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A multilayered gas diffusion unitary electrode body having two catalytically active layers for an electrochemical apparatus, fuel cell elements and electrolysis cells, said gas diffusion unitary electrode body comprising an interiorly positioned, connecting layer comprising an electrically conductive resinous material, an intermediate gas-coducting, catalytically active layer affixed onto each face of said connecting layer, and a porous covering layer affixed onto the respective outer faces of the defined intermediate layer, the average pore radius of each of the covering layers being smaller than the average pore radius of the intermediate layer, said layers forming a unitary electrode body, and said connecting layer comprising 3 to 20 percent by weight of a polyalkylene resin, the remainder being carbonyl nickel.
Claim 2
Dependent Claim
132 words
A multilayered gas diffusion unitary electrode body having two catalytically active layers for an electrochemical apparatus, fuel cell elements and electrolysis cells, said gas diffusion electrode comprising two catalytically active working layers, and a connecting layer which is positioned between and connected to the opposite inside faces of the two catalytically active working layers, said connecting layer comprising resinous material and being gas-impervious except for gas bores for supplying gas to and through said layer into the adjoining two catalytically active layers and comprising electrically insulating powdered magnesium oxide or aluminum oxide, and a covering layer affixed onto each outer face of each catalytically active working layer, said covering layer being electrolyte-pervious and gas-impervious and having an average pore size smaller than the average pore size of the adjoining catalytically active layer.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |