US2680113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing water-soluble products from black liquor lignin
Assignee: SVENSKA CELLULOSAFORENINGENS C
•
Filing: 1950-12-19
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Granted: 1954-06-01
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Expires: 1970-12-19
Abstract
No abstract record available.
Inventors
- 👤 Adler Erich
- 👤 Hagglund Erik Karl Mauritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:56
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
IN THE MANUFACTURE OF WATER-SOLUBLE PRODUCTS FROM LIGNIN MATERIALS, THE PROCESS WHICH COMPRISES SULFONATING BLACK LIQUID LIGNIN BY SUBJECTING IT TO THE ACTION OF A SULFONATING AGENT, SELECTED FROM THE CLASS CONSISTING OF SULFUROUS ACID AND WATER-SOLYBLE SALTS OF SULFUROUS ACID, ALSO SUBJECTING SAID LIGNIN TO AN OXIDIZING TREATMENT WITH AN OXIDIZING GAS, SELECTED FROM THE CLASS CONSISTING OF AIR AND OXYGEN, PRIOR TO COMPLETION OF THE SULFONATING STEP, AND RECOVERING THE RESULTING WATER-SOLUBLE SULFONATED LIGNIN PRODUCT.
Claim 2
Dependent Claim
77 words
IN THE MANUFACTURE OF WATER-SOLUBLE PRODUCTS FROM LIGNIN MATERIALS, THE PROCESS WHICH COMPRISES SULFONATING BLACK LIQUID LIGNIN BY SUBJECTING IT TO THE ACTION OF A SULFONATING AGENT, SELECTED FROM THE CLASS CONSISTING OF SULFUROUS ACID AND WATER-SOLYBLE SALTS OF SULFUROUS ACID, ALSO SUBJECTING SAID LIGNIN TO AN OXIDIZING TREATMENT WITH AN OXIDIZING GAS, SELECTED FROM THE CLASS CONSISTING OF AIR AND OXYGEN, PRIOR TO COMPLETION OF THE SULFONATING STEP, AND RECOVERING THE RESULTING WATER-SOLUBLE SULFONATED LIGNIN PRODUCT.
References Cited (Backward Citations)
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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) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |