Patent US3549572A successfully refreshed from Google Patents.
Patent US4236993A successfully refreshed from Google Patents.
US4236993A
Expired / Lapsed
US
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Electrode for water electrolysis
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1979-11-29
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Granted: 1980-12-02
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Expires: 1999-11-29
Abstract
Abstract An electrode for water electrolysis which comprises a solid solution of graphite and polytetrafluorethylene impregnated with a catalyst mixture of platinum metal oxides, the solid solution being pressed and sintered on a reinforcing net of metal cloth, as well as a process for preparing the electrode. The electrodes are useful in large scale water electrolysis for the production of hydrogen.
Inventors
- 👤 Rene Muller
- 👤 Samuel Stucki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:40
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/042; C25B11/043
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
37 words
An electrode for water electrolysis which comprises: a solid solution of graphite and polytetrafluorethylene impregnated with a catalyst mixture of platinum metal oxides, said solid solution being pressed and sintered on a reinforcing net of metal cloth.
Claim 2
Dependent Claim
37 words
An electrode for water electrolysis which comprises: a solid solution of graphite and polytetrafluorethylene impregnated with a catalyst mixture of platinum metal oxides, said solid solution being pressed and sintered on a reinforcing net of metal cloth.
Claim 3
Dependent Claim
24 words
The electrode of claim 1 wherein said catalyst mixture comprises 10-70% by weight of RuO 2 and 90-30% by weight of IrO 2 .
Claim 4
Dependent Claim
23 words
The electrode of claim 2 wherein said mixture comprises 20% by weight of RuO 2 and 80% by weight of IrO 2 .
Claim 5
Dependent Claim
23 words
The electrode of any of claims 1 or 3 wherein said metal cloth is made of wire having a diameter of 0.05-0.2 mm.
Claim 6
Dependent Claim
33 words
The electrode of any of claims 1 or 3 wherein said graphite is present in an amount of 60-95% by weight and said polytetrafluorethylene is present in an amount of 5-40% by weight.
Claim 7
Dependent Claim
20 words
The electrode of any of claims 1 or 3 wherein the metal of said net of metal cloth is tantalum.
Claim 8
Dependent Claim
20 words
The electrode of any of claims 1 or 3 wherein the metal of said net of metal cloth is titanium.
Claim 9
Dependent Claim
61 words
A process for preparing the electrode of claim 1 which comprises mixing graphite and polytetrafluorethylene powders; pressing said mixture on a net of metal cloth; sintering said pressed mixture under an argon atmosphere at 340°-400° C.; inmersing said sintered mixture into an alcoholic solution of platinum metal chlorides; drying the resulting mixtures; and oxidizing said mixture in air at 340°-400° C.
Claim 10
Dependent Claim
23 words
The process of claim 8 wherein said mixture of graphite and polytetrafluorethylene powders is such that it contains 60-95% graphite and 5-40% polytetrafluorethylene.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein said wire has a diameter of 0.05-0.2 mm.
Claim 12
Dependent Claim
24 words
The process of claim 8 wherein said platinum metal chlorides are selected from the group consisting of ruthenium chloride, iridium chloride and mixtures thereof.
Claim 13
Dependent Claim
25 words
The process of claim 11 wherein said platinum metal chlorides comprise a mixture of 20% by weight ruthenium chloride and 80% by weight iridium chloride.
References Cited (Backward Citations)
BE749507A
Cited
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 |