US4517068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrocatalytic electrode
Assignee: Eltech Systems Corp
•
Filing: 1981-12-28
•
Granted: 1985-05-14
•
Expires: 2001-12-28
Abstract
Abstract An electrode, especially for chlorine and hypochlorite production, comprises an electrocatalyst consisting of 22-55 mol % ruthenium oxide, 0.2-22 mol % palladium oxide and 44-77.8 mol % titanium oxide. The electrocatalyst may form a coating on a valve metal substrate and may be topcoated with a porous layer of titanium or tantalum oxide.
Inventors
- 👤 Jean M. Hinden
- 👤 Lynne M. Ernes
- 👤 Patrick E. Visel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:03
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/091; C25B11/093
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
An electrode comprising an electrocatalyst based on the oxides of ruthenium, palladium and titanium, characterized in that the electrocatalyst consists of a three-component mixed oxide containing: 22-55% Ru 0.2-22% Pd and 44-77.8% Ti calculated as molar percentages of the respective oxides.
Claim 2
Dependent Claim
41 words
An electrode comprising an electrocatalyst based on the oxides of ruthenium, palladium and titanium, characterized in that the electrocatalyst consists of a three-component mixed oxide containing: 22-55% Ru 0.2-22% Pd and 44-77.8% Ti calculated as molar percentages of the respective oxides.
Claim 3
Dependent Claim
25 words
The electrode of claim 1, wherein the electrocatalyst consists of 22-28% Ru, 1-12% Pd and 60-77% Ti calculated as molar percentages of the respective oxides.
Claim 4
Dependent Claim
24 words
The electrode of claim 1 or 2, wherein the molar ratio of palladium oxide to ruthenium oxide is within the range 1:2 to 1:20.
Claim 5
Dependent Claim
21 words
The electrode of claim 1 or 2, wherein the electrocatalyst is a coating of mud-cracked configuration on a valve metal substrate.
Claim 6
Dependent Claim
21 words
The electrode of claim 4, wherein an electrocatalytically inert porous layer of a ceramic oxide is superimposed on the electrocatalyst coating.
Claim 7
Dependent Claim
18 words
The electrode of claim 1 or 2, wherein the electrocatalyst is carried by or incorporated in a separator.
Claim 8
Dependent Claim
19 words
The electrode of claim 3, wherein the electrocatalyst is a coating of mud-cracked configuration on a valve metal substrate.
Claim 9
Dependent Claim
21 words
The electrode of claim 7, wherein an electrocatalytically inert porous layer of a ceramic oxide is superimposed on the electrocatalytic coating.
Claim 10
Dependent Claim
16 words
The electrode of claim 3, wherein the electrocatalyst is carried by or incorporated in a separator.
Claim 11
Dependent Claim
33 words
The electrode of claim 1 wherein the electrocatalyst consists of a coformed mixture of the oxides in the form of solid solution of ruthenium-titanium oxides in which the palladium oxide is finely distributed.
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) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |