US3032387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective removal of nitrogen oxides from gas streams
Assignee: Engelhard Industries Inc
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Filing: 1959-04-17
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Granted: 1962-05-01
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Expires: 1979-04-17
Abstract
No abstract record available.
Inventors
- 👤 Holger C Andersen
- 👤 Johann G E Cohn
- 👤 Richard C Glogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:26
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A PROCESS FOR THE SELECTIVE REMOVAL OF OXIDES OF NITROGEN FROM OXYGEN-CONTAINING GASES ALSO CONTAINING NITROGEN DOXIDE, NITRIC OXIDE AND INERT GASES, WHICH COMPRISES CONTACTING AN ADMIXTURE OF THE OXYGEN-CONTAINING GASES AND A GASEOUS FUEL SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, CARBON MONOXIDE AND GASEOUS HYDROCARBONS, THE FUEL BEING PRESENT IN THE ADMIXTURE IN AMOUNT LESS THAN THE OXYGEN EQUIVALENT, WITH A PLATINUM GROUP METAL CATALYST AT AN ELEVATED TEMPERATURE THEREBY SELECTIVELY REDUCING THE NITROGEN DIOXIDE TO NITRIC OXIDE BY REACTION WITH THE FUEL, AND CONTACTING THE THUS-OBTAINED GASEOUS MIXTURE TOGETHER WITH AMMONIA WITH A PLATINUM GROUP METAL CATALYST AT AN ELEVATED TEMPERATURE THEREBY SELECTIVELY REDUCING THE NITRIC OXIDE BY REACTION WITH THE AMMONIA, TO OBTAIN AN EFFLUENT GAS SUBSTANTIALLY FREE OF AIR-POLLUTING NITROGEN OXIDES.
Claim 2
Dependent Claim
126 words
A PROCESS FOR THE SELECTIVE REMOVAL OF OXIDES OF NITROGEN FROM OXYGEN-CONTAINING GASES ALSO CONTAINING NITROGEN DOXIDE, NITRIC OXIDE AND INERT GASES, WHICH COMPRISES CONTACTING AN ADMIXTURE OF THE OXYGEN-CONTAINING GASES AND A GASEOUS FUEL SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, CARBON MONOXIDE AND GASEOUS HYDROCARBONS, THE FUEL BEING PRESENT IN THE ADMIXTURE IN AMOUNT LESS THAN THE OXYGEN EQUIVALENT, WITH A PLATINUM GROUP METAL CATALYST AT AN ELEVATED TEMPERATURE THEREBY SELECTIVELY REDUCING THE NITROGEN DIOXIDE TO NITRIC OXIDE BY REACTION WITH THE FUEL, AND CONTACTING THE THUS-OBTAINED GASEOUS MIXTURE TOGETHER WITH AMMONIA WITH A PLATINUM GROUP METAL CATALYST AT AN ELEVATED TEMPERATURE THEREBY SELECTIVELY REDUCING THE NITRIC OXIDE BY REACTION WITH THE AMMONIA, TO OBTAIN AN EFFLUENT GAS SUBSTANTIALLY FREE OF AIR-POLLUTING NITROGEN OXIDES.
References Cited (Backward Citations)
US2382189A
Cited
US2910343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-30 | 1965-10-30 | 1966-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-30 | 1969-10-30 | 1970-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-30 | 1973-10-30 | 1974-05-01 | $7700.00 | Window Closed / Lapsed |