US3331733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing polysulfide-containing cooking liquor
Assignee: Mo och Domsjo AB
•
Filing: 1963-12-13
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Granted: 1967-07-18
•
Expires: 1983-12-13
Abstract
No abstract record available.
Inventors
- 👤 Venemark Rut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:49
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0064; D21C11/0071; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR PREPARING A POLYSULFIDE-CONTAINING COOKING LIQUOR FOR USE IN THE SULFATE METHOD OF PREPARING CELLULOSE PULP, WHICH COMPRISES STRIPPING HYDROGEN SULFIDE FROM A GREEN LIQUOR CONTAINING SODIUM SULFIDE AND OBTAINED FROM SPENT LIQUOR PRODUCED IN THE SULFATE PULPING METHOD, BY INTRODUCING A CARBON DIOXIDE STRIPPING GAS MIXTURE INTO THE GREEN LIQUOR, FORMING S SOLUTION CONTAINING SODIUM CARBONATE AND SODIUM BICARBONATE, CONVERTING THE HYDROGEN SULFIED TO SULFUR BY BURNING SUBSTANTIALLY ALL THE HYDROGEN SULFIDE IN THE CARBON DIOXIDE STRIPPING GAS
Claim 2
Dependent Claim
81 words
A PROCESS FOR PREPARING A POLYSULFIDE-CONTAINING COOKING LIQUOR FOR USE IN THE SULFATE METHOD OF PREPARING CELLULOSE PULP, WHICH COMPRISES STRIPPING HYDROGEN SULFIDE FROM A GREEN LIQUOR CONTAINING SODIUM SULFIDE AND OBTAINED FROM SPENT LIQUOR PRODUCED IN THE SULFATE PULPING METHOD, BY INTRODUCING A CARBON DIOXIDE STRIPPING GAS MIXTURE INTO THE GREEN LIQUOR, FORMING S SOLUTION CONTAINING SODIUM CARBONATE AND SODIUM BICARBONATE, CONVERTING THE HYDROGEN SULFIED TO SULFUR BY BURNING SUBSTANTIALLY ALL THE HYDROGEN SULFIDE IN THE CARBON DIOXIDE STRIPPING GAS
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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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |