Patent US2518957A successfully refreshed from Google Patents.
US2518957A
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Method of regenerating a spent cooking liquor resulting from the digestion of a celluloselignin complex
Assignee: Individual
•
Filing: 1947-07-23
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Granted: 1950-08-15
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Expires: 1967-07-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:24
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/04; C; C01; C01B; C01B17/00; C01B17/22; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE METHOD OF REGENERATING A SPENT COOKING LIQUOR RESULTING FROM THE DIGESTION OF A CELLULOSELIGNIN COMPLEX WITH AN ALKALI METAL SULPHIDE AS THE SOLE, ACTIVE INGREDIENT WHICH COMPRISES; NEUTRALIZING SAID LIQUOR WITH SULPHUR DIOXIDE; REMOVING THE MATERIALS RENDERED INSOLUBLE BY SAID NEUTRALIZATION; EVAPORATING THE NEUTRALIZED LIQUOR;
Claim 2
Independent Claim
46 words
THE METHOD OF REGENERATING A SPENT COOKING LIQUOR RESULTING FROM THE DIGESTION OF A CELLULOSELIGNIN COMPLEX WITH AN ALKALI METAL SULPHIDE AS THE SOLE, ACTIVE INGREDIENT WHICH COMPRISES; NEUTRALIZING SAID LIQUOR WITH SULPHUR DIOXIDE; REMOVING THE MATERIALS RENDERED INSOLUBLE BY SAID NEUTRALIZATION; EVAPORATING THE NEUTRALIZED LIQUOR;
References Cited (Backward Citations)
US1864619A
Cited
US1689534A
Cited
US1743080A
Cited
US1860803A
Cited
US1797678A
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US2201797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |