Patent US2543446A successfully refreshed from Google Patents.
US2543446A
Expired / Lapsed
US
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Process for the recovery of nitrogen oxide
Assignee: Commercial Solvents Corp
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Filing: 1948-10-12
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Granted: 1951-02-27
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Expires: 1968-10-12
Abstract
No abstract record available.
Inventors
- 👤 Richard S Egly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:29
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS FOR THE PRODUCTION OF NITRIC ACID WHICH COMPRISES CONTACTING IN A FIRST ZONE A GAS CONTAINING NITRIC OXIDE WITH A SOLUTION COMPRISING SULFURIC ACID, WATER AND NITRIC ACID WHEREBY NITRIC OXIDE SI ABSORBED IN SAID SOLUTION; CONTACTING IN A SECOND ZONE THE SOLUTION FROM SAID FIRST ZONE WITH AN OXYGEN-CONTAINING GAS WHEREBY AN ADDITIONAL AMOUNT OF NITRIC ACID IS FORMED IN SAID SOLUTION AND A GAS CONTAINING OXIDES OF NITROGEN IS LIBERATED; CONTACTING IN A THIRD ZONE THE GAS LIBERATED FROM SAID SECOND ZONE WITH A SOLUTION COMPRISING SULFURIC ACID, WATER AND NITRIC ACID WHEREBY SAID OXIDES OF NITROGEN ARE ABSORBED; PASSING THE SOLUITION FROM SAID THIRD ZONE TO SAID SECOND ZONE FOR OXIDATION OF ABSORBED OXIDES OF NITROGEN THEREIN TO NITRIC ACID; AND WITHDRAWING NITRIC ACID-ENRICHED SOLUTION FROM SAID SECOND ZONE.
Claim 2
Dependent Claim
134 words
A PROCESS FOR THE PRODUCTION OF NITRIC ACID WHICH COMPRISES CONTACTING IN A FIRST ZONE A GAS CONTAINING NITRIC OXIDE WITH A SOLUTION COMPRISING SULFURIC ACID, WATER AND NITRIC ACID WHEREBY NITRIC OXIDE SI ABSORBED IN SAID SOLUTION; CONTACTING IN A SECOND ZONE THE SOLUTION FROM SAID FIRST ZONE WITH AN OXYGEN-CONTAINING GAS WHEREBY AN ADDITIONAL AMOUNT OF NITRIC ACID IS FORMED IN SAID SOLUTION AND A GAS CONTAINING OXIDES OF NITROGEN IS LIBERATED; CONTACTING IN A THIRD ZONE THE GAS LIBERATED FROM SAID SECOND ZONE WITH A SOLUTION COMPRISING SULFURIC ACID, WATER AND NITRIC ACID WHEREBY SAID OXIDES OF NITROGEN ARE ABSORBED; PASSING THE SOLUITION FROM SAID THIRD ZONE TO SAID SECOND ZONE FOR OXIDATION OF ABSORBED OXIDES OF NITROGEN THEREIN TO NITRIC ACID; AND WITHDRAWING NITRIC ACID-ENRICHED SOLUTION FROM SAID SECOND ZONE.
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US1264512A
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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) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |