Patent EP0211412A2 successfully refreshed from Google Patents.
Patent US2589684A successfully refreshed from Google Patents.
US2589684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of so2
Assignee: Imperial Chemical Industries Ltd
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Filing: 1948-09-20
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Granted: 1952-03-18
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Expires: 1968-09-20
Abstract
No abstract record available.
Inventors
- 👤 Herbert A Edge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:47
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR RECOVERING SULPHUR DIOXIDE FROM GASEOUS ADMIXTURES CONTAINING THE SAME WHICH COMPRISES BRINGING A GASEOUS MIXTURE CONTAINING SULPHUR DIOXIDE INTO CONTACT WITH AN AQUEOUS SOLUTION CONTAINING AMMONIUM SULFITE AND AMMONIUM BISULFITE WHEREBY THE SULPHUR DIOXIDE IS ABSORBED AND RECOVERING SAID ABSORBED SULPHUR DIOXIDE BY TREATING THE SOLUTION WITH NITRIC ACID, THE QUANTITY OF NITRIC ACID BEING AT MOST 80% IN EXCESS OF THAT STOICHIOMETRICALLY REQUIRED.
Claim 2
Dependent Claim
67 words
A PROCESS FOR RECOVERING SULPHUR DIOXIDE FROM GASEOUS ADMIXTURES CONTAINING THE SAME WHICH COMPRISES BRINGING A GASEOUS MIXTURE CONTAINING SULPHUR DIOXIDE INTO CONTACT WITH AN AQUEOUS SOLUTION CONTAINING AMMONIUM SULFITE AND AMMONIUM BISULFITE WHEREBY THE SULPHUR DIOXIDE IS ABSORBED AND RECOVERING SAID ABSORBED SULPHUR DIOXIDE BY TREATING THE SOLUTION WITH NITRIC ACID, THE QUANTITY OF NITRIC ACID BEING AT MOST 80% IN EXCESS OF THAT STOICHIOMETRICALLY REQUIRED.
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) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |