US4279713A
Expired / Lapsed
US
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Method of catalyzing the evolution of gaseous hydrogen
Assignee: National Research Development Corp UK
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Filing: 1979-06-22
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Granted: 1981-07-21
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Expires: 1999-06-22
Abstract
Abstract In chlor-alkali cells, the cathode may consist of a nickel screen carrying 15.6 mg Co 2 NiS 4 bonded by 4.4 mg polytetrafluoroethylene per cm 2 .
Inventors
- 👤 Alfred C. C. Tseung
- 👤 Maurice C. M. Man
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:39
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/095
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
59 words
A method of catalyzing the evolution of gaseous hydrogen formed by alkaline water electrolysis in an aqueous alkali electrolysis cell, said method comprising using as the catalyst a cathode coated with particles whose surfaces to a depth of at least 20 Angstroms are sulphur compounds of two metals selected from the group consisting of cobalt, nickel, iron and manganese.
Claim 2
Independent Claim
59 words
A method of catalyzing the evolution of gaseous hydrogen formed by alkaline water electrolysis in an aqueous alkali electrolysis cell, said method comprising using as the catalyst a cathode coated with particles whose surfaces to a depth of at least 20 Angstroms are sulphur compounds of two metals selected from the group consisting of cobalt, nickel, iron and manganese.
Claim 3
Dependent Claim
23 words
A method according to claim 1, wherein the cathode comprises said particles bonded together in porous fashion by a chemically inert polymeric binder.
Claim 4
Independent Claim
45 words
A method of catalyzing the evolution of gaseous hydrogen formed by alkaline water electrolysis comprising, using as catalyst, particles whose surfaces to depth of at least 20 A are sulphur compounds of two metals selected from the group consisting of cobalt, nickel, iron and manganese.
Claim 5
Independent Claim
45 words
A method of catalyzing the evolution of gaseous hydrogen formed by alkaline water electrolysis comprising, using as catalyst, particles whose surfaces to depth of at least 20 A are sulphur compounds of two metals selected from the group consisting of cobalt, nickel, iron and manganese.
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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |