US3892836A
Expired / Lapsed
US
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Sintered NO{HD x {b reduction catalysts
Assignee: International Motors LLC
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Filing: 1974-01-07
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Granted: 1975-07-01
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Expires: 1994-01-07
Abstract
Abstract Catalysts for reducing nitrogen oxides which contain praseodynium and cerium oxides.
Inventors
- 👤 William A Compton
- 👤 Joseph F Nachman
- 👤 Manfred I Seegall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:46
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/10; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D2255/00; B01D2255/20; B01D2255/206; B01D2255/2065; B01D2255/2066
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
IN THE ELEMINATION OF NITROGEN OXIDES FROM A GAS STREAM BY BRINGING THE GAS INTO CONTACT WITH A NITROGEN OXIDE REDUCING CATALYST, THE IMPROVEMENT WHEREIN THE GAS STREAM IS CONTACTED AT A TEMPERATURE OF AT LEAST 600*F. WITH A CATALYST WHICH CONSISTS ESSENTIALLY OF FROM 25 TO 75 PERCENT PRASEODYMIUM OXIDE OF THE FORMULA PROX WHERE X IS 1.5 TO 2.0 AND FROM 75 TO 25 PERCENT OF A CERIUM OXIDE.
Claim 2
Dependent Claim
71 words
IN THE ELEMINATION OF NITROGEN OXIDES FROM A GAS STREAM BY BRINGING THE GAS INTO CONTACT WITH A NITROGEN OXIDE REDUCING CATALYST, THE IMPROVEMENT WHEREIN THE GAS STREAM IS CONTACTED AT A TEMPERATURE OF AT LEAST 600*F. WITH A CATALYST WHICH CONSISTS ESSENTIALLY OF FROM 25 TO 75 PERCENT PRASEODYMIUM OXIDE OF THE FORMULA PROX WHERE X IS 1.5 TO 2.0 AND FROM 75 TO 25 PERCENT OF A CERIUM OXIDE.
Claim 3
Dependent Claim
21 words
The method of claim 1, wherein said gas stream is contacted with said catalyst at a temperature of at least 1,200*F.
Claim 4
Dependent Claim
15 words
The method of claim 1, wherein the gas stream is an internal combustion engine exhaust.
Claim 5
Dependent Claim
36 words
A nitrogen oxide reduction catalyst which consists essentially of from 25 to 75 percent praseodynium oxide of the formula PrOx where x is 1.5 to 2.0 and from 75 to 25 percent of a cerium oxide.
Claim 6
Dependent Claim
36 words
A nitrogen oxide reduction catalyst which consists essentially of from 25 to 75 percent praseodynium oxide of the formula PrOx where x is 1.5 to 2.0 and from 75 to 25 percent of a cerium oxide.
Claim 7
Dependent Claim
38 words
PoRous, sintered catalyst pellets in which the catalyst consists essentially of from 25 to 75 percent praseodymium oxide of the formula PrOx where x is 1.5 to 2.0 and from 75 to 25 percent of a cerium oxide.
Claim 8
Dependent Claim
38 words
PoRous, sintered catalyst pellets in which the catalyst consists essentially of from 25 to 75 percent praseodymium oxide of the formula PrOx where x is 1.5 to 2.0 and from 75 to 25 percent of a cerium oxide.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |