Patent US2495248A successfully refreshed from Google Patents.
US2495248A
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Smelting process of recovering chemicals from the black liquor derived in pulp mills
Assignee: Combustion Engineering Inc
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Filing: 1946-08-08
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Granted: 1950-01-24
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Expires: 1966-08-08
Abstract
No abstract record available.
Inventors
- 👤 Emilio A J Gagliardi
- 👤 Mellor Charles
- 👤 Alexander L Hamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:57
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/12; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN THE CONTINUOUS SMELTING PROCESS OF RECOVERING CHEMICAL FROM THE BLACK LIQUOR DERIVED IN PULP MILLS FROM DIGESTING THE CELLULOSE WITH WHITE LIQUOR, IN WHICH THE BLACK LIQUOR IN CONCENTRATED AND THEN SUBSTANTIALLY CONTINUOUSLY SPRAYED INTO A BOILER FURNACE TO GRAVITATE THEREIN TO BE DRIED FOR COMBUSTION OF THE COMBUSTIBLE CONSTITUENTS THEREOF AND IN WHICH SALT CAKE IS SUBSTANTIALLY CONTINUOUSLY INTRODUCED INTO THE BLACK LIQUOR PRIOR TO ITS INTRODUCTION INTO THE FURNACE AND IN WHICH THE CHEMICAL IS RECOVERED AS A SMELT IN THE FURNACE AND THE SMELT IS TREATED TO OBTAIN WHITE LIQUOR FOR RE-USE IN THE DIGESTION OF FURTHER CELLULOSE, THE STEP OF CONTROLLING THE SULPHID-
Claim 2
Dependent Claim
108 words
IN THE CONTINUOUS SMELTING PROCESS OF RECOVERING CHEMICAL FROM THE BLACK LIQUOR DERIVED IN PULP MILLS FROM DIGESTING THE CELLULOSE WITH WHITE LIQUOR, IN WHICH THE BLACK LIQUOR IN CONCENTRATED AND THEN SUBSTANTIALLY CONTINUOUSLY SPRAYED INTO A BOILER FURNACE TO GRAVITATE THEREIN TO BE DRIED FOR COMBUSTION OF THE COMBUSTIBLE CONSTITUENTS THEREOF AND IN WHICH SALT CAKE IS SUBSTANTIALLY CONTINUOUSLY INTRODUCED INTO THE BLACK LIQUOR PRIOR TO ITS INTRODUCTION INTO THE FURNACE AND IN WHICH THE CHEMICAL IS RECOVERED AS A SMELT IN THE FURNACE AND THE SMELT IS TREATED TO OBTAIN WHITE LIQUOR FOR RE-USE IN THE DIGESTION OF FURTHER CELLULOSE, THE STEP OF CONTROLLING THE SULPHID-
References Cited (Backward Citations)
US1442494A
Cited
US1605928A
Cited
US1500890A
Cited
US1555512A
Cited
US1575473A
Cited
US1580269A
Cited
US1808773A
Cited
US1801945A
Cited
US1779537A
Cited
US1933254A
Cited
US2213052A
Cited
US2258467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-23 | 1953-07-25 | 1954-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-23 | 1957-07-25 | 1958-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-23 | 1961-07-25 | 1962-01-24 | $7700.00 | Window Closed / Lapsed |