US3917525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode for electrochemical reactions
Assignee: Rhone Progil SA
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Filing: 1974-07-05
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Granted: 1975-11-04
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Expires: 1994-07-05
Abstract
Abstract An electrode for electrochemical reactions comprising a substrate of a film forming or barrier metal covered with a cobaltite of at least two rare earth metals, one of the rare earth metals having a high atomic number and the other having a lower atomic number.
Inventors
- 👤 Pierre Bouy
- 👤 Guy Cheradame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:33
CPC Classifications
C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/073; C25B11/075; C25B11/077; C25B11/0773
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
AN ELECTRODE FOR ELECTROCHMECIAL REACTIONS, COMPRISING A SUBSTRATE COVERED WITH A COMPOUND HAVING A PEROVSKITE STRUCTURE, CHARACTERIZED BY THE FACT THAT THE SUBSTRATE IS OF A FILM FORMING METAL ANDTHE COMPOUND OF PEROVSKITE STRUCTURE IS A COBALTITE OF RARE EARTHS HAVING THE GENERAL FORMULA LNXLN'' (1-X)CO03 IN WHICH LN HAS AN ATOMIC NUMBER OF AT LEAST ABOUT 65 AND LN'' HAS AN ATOMIC NUMBER BELOW ABOUT 65, WHEREIN X IS BETWEEN 0.001 AND 0.999.
Claim 2
Dependent Claim
74 words
AN ELECTRODE FOR ELECTROCHMECIAL REACTIONS, COMPRISING A SUBSTRATE COVERED WITH A COMPOUND HAVING A PEROVSKITE STRUCTURE, CHARACTERIZED BY THE FACT THAT THE SUBSTRATE IS OF A FILM FORMING METAL ANDTHE COMPOUND OF PEROVSKITE STRUCTURE IS A COBALTITE OF RARE EARTHS HAVING THE GENERAL FORMULA LNXLN'' (1-X)CO03 IN WHICH LN HAS AN ATOMIC NUMBER OF AT LEAST ABOUT 65 AND LN'' HAS AN ATOMIC NUMBER BELOW ABOUT 65, WHEREIN X IS BETWEEN 0.001 AND 0.999.
Claim 3
Dependent Claim
15 words
An electrode according to claim 1, in which x is between about 0.05 and 0.3.
Claim 4
Dependent Claim
36 words
An electrode according to claim 1, in which the rare earth of Ln has a high atomic number and is a member selected from the class consisting of terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium.
Claim 5
Dependent Claim
26 words
An electrode according to claim 1, in which Ln'' is a member selected from the class consisting of lanthanum, cerium, praseodymium, neodymium, samarium, europium and gadolinium.
Claim 6
Dependent Claim
32 words
An electrode according to claim 1, in which the film forming metal substrate is a member selected from the class consisting of titanium, tantalum, tungsten, hafnium, zirconium, aluminum, niobium and their alloys.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |