US3706600A
Expired / Lapsed
US
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Stripping of coated titanium electrodes for re-coating
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-06-18
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Granted: 1972-12-19
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Expires: 1991-06-18
Abstract
Abstract Stripping a coating comprising a platinum group metal oxide from a titanium support member of a coated titanium electrode ready for re-coating, by immersing the electrode in molten alkali metal hydroxide containing a small amount of alkali metal hydride, washing the treated electrode in water and then, preferably, dipping in hot dilute mineral acid.
Inventors
- 👤 Nicholas William Jame Pumphrey
- 👤 Keith Graham Moss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:46
CPC Classifications
C; C25; C25B; C25B11/00; C23; C23G; C23G1/00; C23G1/28; C23G1/32; C25B15/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
24 words
A method according to claim 1, wherein the electrode is immersed in the said bath for at least 30 seconds before washing in water.
Claim 2
Dependent Claim
25 words
A method according to claim 1, wherein the said molten alkali metal hydroxide is sodium hydroxide and the said alkali metal hydride is sodium hydride.
Claim 3
Dependent Claim
19 words
A method according to claim 3, wherein the temperature of the said bath is in the range 345*-380* C.
Claim 4
Dependent Claim
18 words
A method according to claim 4, wherein the said bath contains 0.5-2 percent by weight of sodium hydride.
Claim 5
Dependent Claim
22 words
A method according to claim 5, wherein the electrode is immersed in the said bath for 1-3 minutes before washing in water.
Claim 6
Dependent Claim
28 words
A method according to claim 1, wherein the said step of washing the treated electrode in water is carried out by immediately quenching the hot electrode in water.
Claim 7
Dependent Claim
37 words
A method according to claim 1, wherein after the said step of washing the treated electrode in water the electrode is immersed in hot dilute mineral acid for a few seconds and is then washed in water.
Claim 8
Dependent Claim
24 words
A method according to claim 8, wherein the electrode is immersed in the said acid until effervescence begins and is then washed in water.
Claim 9
Dependent Claim
21 words
A method according to claim 1, wherein the coating of the electrode is a mixture of ruthenium dioxide and titanium dioxide.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |