Patent US135846A successfully refreshed from Google Patents.
Patent US3645796A successfully refreshed from Google Patents.
US3645796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochemical cell containing electrical contact and method of using
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1969-12-18
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Granted: 1972-02-29
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Expires: 1989-12-18
Abstract
Abstract To prevent corrosion at the contact to a gas-diffusion electrode of an electrolytic cell, the electrode is provided on its gasside with a hydrophobic porous coating of, for example, polytetrafluoroethylene and with a layer of graphite, tungsten carbide, or niobium silicide in conductive contact with the electrode.
Inventors
- 👤 Harald Bohm
- 👤 Joachim Heffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:48
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/8605; H01M4/8626; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
23 words
A combination as claimed in claim 1, further comprising: means for introducing gas to said gas side; and electrolyte contacting said opposite side.
Claim 2
Dependent Claim
22 words
A combination as claimed in claim 2, further comprising thermoplastic islands bonded between said layer of electrically conductive material and said electrode.
Claim 3
Dependent Claim
40 words
A combination as claimed in claim 2, said layer of electrically conductive material consisting essentially of a bonded mixture of the powder of a material selected from the group consisting of graphite, tungsten carbide, and niobium silicide with powdered plastic.
Claim 4
Dependent Claim
13 words
A combination as claimed in claim 2, said hydrophobic, porous coating being polytetrafluoroethylene.
Claim 5
Dependent Claim
19 words
A combination as claimed in claim 2, current flow during cell operation being by way of said spring means.
Claim 6
Dependent Claim
18 words
A combination as claimed in claim 2, said portion being annular, said spring means being a Belleville spring.
Claim 7
Dependent Claim
11 words
A combination as claimed in claim 2, said electrolyte being acidic.
Claim 8
Dependent Claim
54 words
A method of using the combination as claimed in claim 1, comprising contacting said gas side with gas in a gas chamber and said electrolyte side with electrolyte in an electrolyte chamber, the conditions being such that electrolyte would seep into said gas chamber but for the presence of said layer and said coating.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |