Patent US3897367A successfully refreshed from Google Patents.
US3897367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal oxide catalytic compositions
Assignee: EIDP Inc
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Filing: 1973-10-10
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Granted: 1975-07-29
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Expires: 1993-10-10
Abstract
Abstract Compounds having the perovskite-type AB03 structure wherein 1 to 20% of the B site cations are Ru or Pt, the remainder consisting essentially of cobalt, preferably partially tetravalent and the A sites being occupied by a mixture of lanthanide ions and ions of Group IA, IIA, and IVA of the Periodic Table having an ionic radius of about 0.9 to about 1.65 A are useful catalysts for reduction and oxidation reactions, particularly for the cleanup of exhaust gases of internal combustion engines.
Inventors
- 👤 Alan Lauder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/70; B01J23/76; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1026; B01D2255/20; B01D2255/207; B01D2255/20746; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S502/00; Y10S502/525
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A COMPOUND HAVING THE PEROVSKITE-TYPE ABO3 CRYSTAL STRUCTURE WHEREIN FROM ABOUT 1 TO UP TO 20% OF THE B CATION SITES ARE OCCUPIED BY RUTHENIUM OR PLATINUM IONS AND THE REMAINDER OF THE B CATIONS SITES ARE OCCUPIED BY IONS CONSISTING ESSENTIALLY OF COBALT IONS, AND THE A CATION SITES ARE OCCUPIED BY LANTHANIDE IONS OF ATOMIC NUMBER 57 TO 71 ANDIONS OF AT LEAST ONE METAL OF GROUPS IA, IIA AND IVA OF THE PERIODIC TABLE HAVING IONIC RADII OF ABOUT 0.9A TO 1.65, AND PROPORTIONED SO THAT NO MORE THAN 50% OF THE COBALT IONS ARE TETRAVALENT AND THE REMAINING COBALT IONS ARE TRIVALENT.
Claim 2
Dependent Claim
106 words
A COMPOUND HAVING THE PEROVSKITE-TYPE ABO3 CRYSTAL STRUCTURE WHEREIN FROM ABOUT 1 TO UP TO 20% OF THE B CATION SITES ARE OCCUPIED BY RUTHENIUM OR PLATINUM IONS AND THE REMAINDER OF THE B CATIONS SITES ARE OCCUPIED BY IONS CONSISTING ESSENTIALLY OF COBALT IONS, AND THE A CATION SITES ARE OCCUPIED BY LANTHANIDE IONS OF ATOMIC NUMBER 57 TO 71 ANDIONS OF AT LEAST ONE METAL OF GROUPS IA, IIA AND IVA OF THE PERIODIC TABLE HAVING IONIC RADII OF ABOUT 0.9A TO 1.65, AND PROPORTIONED SO THAT NO MORE THAN 50% OF THE COBALT IONS ARE TETRAVALENT AND THE REMAINING COBALT IONS ARE TRIVALENT.
Claim 3
Dependent Claim
24 words
Composition of claim 1 having the formula (SrxLa1-x) (Co1-yRuy)O3 wherein y is from 0.01 to 0.2 and (1-x) is 0.95 (1-y) to 0.5 (1-y).
Claim 4
Dependent Claim
25 words
Composition of claim 1 having the formula (SrxLa1-x) (Co1-yPty)O3 wherein y is from 0.01 to 0.1 and (1-x) is 0.95 to (1-y) to 0.5 (1-y).
Claim 5
Dependent Claim
12 words
A catalyst comprising a compound of claim 1 on a shaped support.
Claim 6
Dependent Claim
19 words
An article of claim 4 wherein said compound is preformed and is affixed to the support with a binder.
Claim 7
Dependent Claim
10 words
An article of claim 5 wherein said support is alumina.
Claim 8
Dependent Claim
16 words
An article of claim 6 wherein said alumina is shaped in the form of a honeycomb.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |