US5019224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic process
Assignee: Imperial Chemical Industries Ltd
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Filing: 1990-02-14
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Granted: 1991-05-28
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Expires: 2010-02-14
Abstract
Abstract An electrolytic process in which an aqueous electrolyte is electrolysed in an electrolytic cell which comprises at least one anode and at least one cathode, in which oxygen is evolved at the anode, and which is operated at an anode current density of at least 3kA/m 2 , in which the anode comprises a substrate having at least in part an outer surface of tantalum, or of an alloy thereof, at least part of the tantalum or tantalum alloy substrate having a coating of an electrocatalytically-active material. The anode may be a tantalum-clad titanium substrate, and the process may be, for example, an electrogalvanizing or electrotinning process.
Inventors
- 👤 David A. Denton
- 👤 Peter C. S. Hayfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:57
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093; C25B1/00; C25B1/01; C25B1/02; C25B1/04; C25B11/097; C25C; C25C7/00; C25C7/02; C25D; C25D17/00; C25D17/10; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/36
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
An electrolytic process which comprises electrolysing an aqueous electrolyte in an electrolytic cell having at least one anode and at least one cathode, evolving oxygen at the anode, and effecting the electrolysis at an anode current density of at least 3 kA/m 2 , in which the anode comprises a substrate of which at least a part thereof is provided with an outer surface of tantalum metal, or of an alloy thereof, at least part of the tantalum metal or tantalum alloy surface having a coating of an electrocatalytically-active material.
Claim 2
Dependent Claim
90 words
An electrolytic process which comprises electrolysing an aqueous electrolyte in an electrolytic cell having at least one anode and at least one cathode, evolving oxygen at the anode, and effecting the electrolysis at an anode current density of at least 3 kA/m 2 , in which the anode comprises a substrate of which at least a part thereof is provided with an outer surface of tantalum metal, or of an alloy thereof, at least part of the tantalum metal or tantalum alloy surface having a coating of an electrocatalytically-active material.
Claim 3
Dependent Claim
95 words
An electrolytic process which comprises electrolysing an aqueous electrolyte in an electrolytic cell having at least one anode and at least one cathode, evolving oxygen at the anode, and effecting the electrolysis at an anode current density of at least 3 kA/m 2 , in which the anode comprises a substrate of titanium or of an alloy thereof and an outer surface of tantalum metal or of an alloy thereof on at least part of the substrate, at least part of the tantalum metal or tantalum alloy surface having a coating of an electrocatalytically-active material.
Claim 4
Dependent Claim
95 words
An electrolytic process which comprises electrolysing an aqueous electrolyte in an electrolytic cell having at least one anode and at least one cathode, evolving oxygen at the anode, and effecting the electrolysis at an anode current density of at least 3 kA/m 2 , in which the anode comprises a substrate of titanium or of an alloy thereof and an outer surface of tantalum metal or of an alloy thereof on at least part of the substrate, at least part of the tantalum metal or tantalum alloy surface having a coating of an electrocatalytically-active material.
Claim 5
Dependent Claim
32 words
A process as claimed in claim 1 in which the anode comprises a core of titanium or of an alloy thereof and an outer surface of tantalum or of an alloy thereof.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 1 in which the anode comprises a sheet of titanium clad with a layer of tantalum.
Claim 7
Dependent Claim
24 words
A process as claimed in claim 4 in which the layer of tantalum has a thickness in the range 5 microns to 5 mm.
Claim 8
Dependent Claim
28 words
A process as claimed in claim 1 in which the coating of electrocatalytically-active material is present in an amount of 1 g/m 2 to 100 g/m 2 .
Claim 9
Dependent Claim
24 words
A process as claimed in claim 1 in which the electrocatalytically-active material comprises Ir0 2 or a mixture of Pt and Ir0 2 .
Claim 10
Dependent Claim
25 words
A process as claimed in claim 1 in which the process is operated at an anode current density of greater than 10 kA/m 2 .
Claim 11
Dependent Claim
23 words
A process as claimed in claim 1 in which the aqueous electrolyte is an acidic electrolyte having a pH of 3 or less.
Claim 12
Dependent Claim
18 words
A process as claimed in claim 1 which is operated at a temperature of greater than 50° C.
Claim 13
Dependent Claim
15 words
A process as claimed in claim 1 which is an electrotinning or an electrogalvanising process.
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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |