US3026240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical recovery system
Assignee: Babcock and Wilcox Co
•
Filing: 1959-05-04
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Granted: 1962-03-20
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Expires: 1979-05-04
Abstract
No abstract record available.
Inventors
- 👤 Robert E Matty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:27
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0064; D21C11/0071; C; C01; C01B; C01B17/00; C01B17/22; C01B17/32; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A SYSTEM FOR THE RECOVERY OF CHEMICALS IN THE RESIDUAL LIQUOR RESULTING FROM THE DIGESTION OF CELLULOSIC MATERIALS IN A COOKING LIQUOR CONTAINING SODIUM SALTS OF SULPHUROUS ACID IN WHICH THE RESIDUAL LIQUOR IS CONCENTRATED AND INCINERATED TO RESULT IN A SMELT CONTAINING SODIUM SULPHIDE AND A GASEOUS PRODUCT INCLUDING SULPHUR DIOXIDE AND CARBON DIOXIDE, THE SMELT IS DISSOLVED TO FORM AN AQUEOUS SOLUTION CONTAINING SODIUM SULPHIDE AND THE GASEOUS PRODUCT PASSED THROUGH A SULPHITING ZONE IN DIRECT CONTACT WITH A LIQUID CONTAINING SODIUM CARBONATE TO PRODUCE THE FINISHED COOKING LIQUOR BY ABSORPTION OF THE SULPHUR DIOXIDE FROM SAID GASEOUS PRODUCT, THE IMPROVED METHOD WHICH COMPRISES PASSING A PORTION OF THE GASEOUS PRODUCT FROM SAID SULPHITING ZONE THROUGH A PRECARBONATION ZONE IN CONTACT WITH SAID DISSOLVED SMELT TO CONVERT
Claim 2
Dependent Claim
130 words
IN A SYSTEM FOR THE RECOVERY OF CHEMICALS IN THE RESIDUAL LIQUOR RESULTING FROM THE DIGESTION OF CELLULOSIC MATERIALS IN A COOKING LIQUOR CONTAINING SODIUM SALTS OF SULPHUROUS ACID IN WHICH THE RESIDUAL LIQUOR IS CONCENTRATED AND INCINERATED TO RESULT IN A SMELT CONTAINING SODIUM SULPHIDE AND A GASEOUS PRODUCT INCLUDING SULPHUR DIOXIDE AND CARBON DIOXIDE, THE SMELT IS DISSOLVED TO FORM AN AQUEOUS SOLUTION CONTAINING SODIUM SULPHIDE AND THE GASEOUS PRODUCT PASSED THROUGH A SULPHITING ZONE IN DIRECT CONTACT WITH A LIQUID CONTAINING SODIUM CARBONATE TO PRODUCE THE FINISHED COOKING LIQUOR BY ABSORPTION OF THE SULPHUR DIOXIDE FROM SAID GASEOUS PRODUCT, THE IMPROVED METHOD WHICH COMPRISES PASSING A PORTION OF THE GASEOUS PRODUCT FROM SAID SULPHITING ZONE THROUGH A PRECARBONATION ZONE IN CONTACT WITH SAID DISSOLVED SMELT TO CONVERT
References Cited (Backward Citations)
US2788273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-19 | 1965-09-18 | 1966-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-19 | 1969-09-18 | 1970-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-19 | 1973-09-18 | 1974-03-20 | $7700.00 | Window Closed / Lapsed |