US2970034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying gases containing oxygen and oxides of nitrogen
Assignee: Engelhard Industries Inc
•
Filing: 1957-04-05
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Granted: 1961-01-31
•
Expires: 1977-04-05
Abstract
No abstract record available.
Inventors
- 👤 Holger C Andersen
- 👤 William J Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:54
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J23/44; B01J23/46; B01J23/464; B01J23/54; B01J23/56; B01J23/63; B01J37/00; B01J37/02; B01J37/0215; B01J37/0221; B01J37/024; B01D2251/00; B01D2251/20; B01D2251/202; B01D2251/204; B01D2251/208; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1023; B01D2255/1025; B01D2256/00; B01D2256/10; B01D2257/00; B01D2257/10; B01D2257/104; B01D2257/40; B01D2257/404; B01D2258/00; B01D2258/02; B01D2258/0283
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS FOR THE PURIFICATION OF WASTE GASES FROM NITRIC ACID PROCESSES CONTAINING OXYGEN AND OXIDES OR NITROGEN WHICH COMPRISES CONTACTING IN A FIRST REACTION ZONE AT REACTION TEMPERATURE THE WASTE GASES AND A FUEL SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, CARBON MONOXIDE AND GASEOUS HYDROCARBONS, THE LATTER BEING PRESENT IN LESS THAN THE STOICHIOMETRIC QUANTITY REQUIRED FOR COMPLETE REACTION OF THE OXYGEN IN THE WASTE GASES WITH A PLATINUM GROUP METAL-CONTAINING CATALYST, COOLING THE EFFLUENT GASES, AND CONTACTING IN A SECOND REACTION ZONE A MIXTURE OF THE EFFLUENT GASES AND ADDITIONAL FUEL, THE LATTER BEING PRESENT IN STOICHIOMETRIC EXCESS OVER THE OXYGEN AND OXIDES OF NITROGEN IN THE EFFLUENT GASES, WITH A PLATINUM GROUP METAL-CONTAINING CATALYST AT REACTION TEMPERATURE.
Claim 2
Dependent Claim
121 words
A PROCESS FOR THE PURIFICATION OF WASTE GASES FROM NITRIC ACID PROCESSES CONTAINING OXYGEN AND OXIDES OR NITROGEN WHICH COMPRISES CONTACTING IN A FIRST REACTION ZONE AT REACTION TEMPERATURE THE WASTE GASES AND A FUEL SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, CARBON MONOXIDE AND GASEOUS HYDROCARBONS, THE LATTER BEING PRESENT IN LESS THAN THE STOICHIOMETRIC QUANTITY REQUIRED FOR COMPLETE REACTION OF THE OXYGEN IN THE WASTE GASES WITH A PLATINUM GROUP METAL-CONTAINING CATALYST, COOLING THE EFFLUENT GASES, AND CONTACTING IN A SECOND REACTION ZONE A MIXTURE OF THE EFFLUENT GASES AND ADDITIONAL FUEL, THE LATTER BEING PRESENT IN STOICHIOMETRIC EXCESS OVER THE OXYGEN AND OXIDES OF NITROGEN IN THE EFFLUENT GASES, WITH A PLATINUM GROUP METAL-CONTAINING CATALYST AT REACTION TEMPERATURE.
References Cited (Backward Citations)
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US2381696A
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US2387577A
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US2475155A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |