US3926773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal anode for electrochemical processes and method of making same
Assignee: De Nora Deutschland GmbH
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Filing: 1973-09-27
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Granted: 1975-12-16
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Expires: 1993-09-27
Abstract
Abstract A valve metal anode, for electrolytical processes, having an electron-active covering layer, comprises electron-activating substances, counteracting passivation of the anode, anchored in a sintered porous carrier layer of valve metal. The carrier layer which is sintered onto the cleaned valve metal base may consist of a powder of the same metal or of the crystallographically similar metal. The infusion of the active substances into the carrier layer can be accomplished by impregnating and drying or baking the active substances, by precipitating them from the vapor phase, galvanically, or from the gaseous phase. The active substances may also be ingredients of the sinter mixture.
Inventors
- 👤 Konrad Koziol
- 👤 Hans-Carl Rathjen
- 👤 Karl-Heinz Sieberer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:47
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
IN AN ANODE, FOR ELECTROLYTICAL PROCESSES, PARTICULARLY FOR CHLORINE-ALAKLI ELECTROLYSIS, HAVING A SOLID CORE OF VALVE METALS SELECTED FROM THE GROUP CONSISTING OF TITANIUM, TANTALUM, NIOBIUM, ZIRCONIUM, HAFNIUM, TUNGSTEN, MOLYBDENUM, AND ALLOYS THEREOF, AND HAVING A COVERING LAYER CONTAINING ACTIVATING SUBSTANCES COUNTERACTING PASSIVATION OF THE ANODE, SELECTED FROM THE GROUP CONSISTING OF METALS AND OXIDES OF THE PLATINUM METAL GROUP, MIXED OXIDES OF NOBLE AND IGNOBLE METALS, AND OXIDES OF IGNOBLE METALS ALONE: THE IMPROVEMENT IN WHICH THE ACTIVATING SUBSTANCES ARE ANCHORED IN A POROUS COVERING LAYER CONSISTING OF POWDERED VALVE METAL WHICH IS SINTERED TO THE SOLID VALVE METAL CORE OF THE ANODE.
Claim 2
Dependent Claim
104 words
IN AN ANODE, FOR ELECTROLYTICAL PROCESSES, PARTICULARLY FOR CHLORINE-ALAKLI ELECTROLYSIS, HAVING A SOLID CORE OF VALVE METALS SELECTED FROM THE GROUP CONSISTING OF TITANIUM, TANTALUM, NIOBIUM, ZIRCONIUM, HAFNIUM, TUNGSTEN, MOLYBDENUM, AND ALLOYS THEREOF, AND HAVING A COVERING LAYER CONTAINING ACTIVATING SUBSTANCES COUNTERACTING PASSIVATION OF THE ANODE, SELECTED FROM THE GROUP CONSISTING OF METALS AND OXIDES OF THE PLATINUM METAL GROUP, MIXED OXIDES OF NOBLE AND IGNOBLE METALS, AND OXIDES OF IGNOBLE METALS ALONE: THE IMPROVEMENT IN WHICH THE ACTIVATING SUBSTANCES ARE ANCHORED IN A POROUS COVERING LAYER CONSISTING OF POWDERED VALVE METAL WHICH IS SINTERED TO THE SOLID VALVE METAL CORE OF THE ANODE.
Claim 3
Dependent Claim
27 words
An anode, as claimed in claim 1, in which the active substances, in combination with the sintered covering layer form a compound material of valve metal/noble metal.
Claim 4
Dependent Claim
27 words
An anode, as claimed in claim 1, in which the active substances, in combination with the covering layer form a cermet-like compound material of valve metal ceramic.
Claim 5
Dependent Claim
21 words
An anode, as claimed in claim 3, in which the ceramic portion of the compound is composed of noble metal oxides.
Claim 6
Dependent Claim
25 words
An anode, as claimed in claim 3, in which the ceramic portion of the compound is composed of oxide mixtures of noble and ignoble metals.
Claim 7
Dependent Claim
23 words
An anode, as claimed in claim 3, in which the ceramic portion of the compound is composed solely of oxides of ignoble metals.
Claim 8
Dependent Claim
15 words
An anode, as claimed in claim 1, in which said porous covering layer comprises titanium.
Claim 9
Dependent Claim
15 words
An anode, as claimed in claim 1, in which said porous covering layer comprises tantalum.
Claim 10
Dependent Claim
18 words
An anode, as claimed in claim 1, in which said porous covering layer comprises a valve metal alloy.
Claim 11
Dependent Claim
20 words
An anode, as claimed in claim 1, in which said porous covering layer comprises a mixture of different valve metals.
References Cited (Backward Citations)
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US3632498A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |