US2959500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the saccharification of cellulose and cellulosic materials
Assignee: Schweizerische Eidgenossenschaft
•
Filing: 1956-02-14
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Granted: 1960-11-08
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Expires: 1976-02-14
Abstract
No abstract record available.
Inventors
- 👤 Schlapfer Paul
- 👤 Silberman Henri Casimir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:02
CPC Classifications
C; C13; C13K; C13K1/00; C13K1/02; D; D21; D21C; D21C3/00; D21C3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS FOR THE SACCHARIFICATION OF CELLULOSE AND CELLULOSIC MATERIALS CONTAINING HEXOSANES AND PENTOSANES, WHICH COMPRISES HEATING SAID MATERIALS AT 120-200*C. WITH AN ALCOHOL, SELECTED FROM THE GROUP CONSISTING OF ISOPROPANOL, N-PROPANOL, N-AMYL ALCOHOL, N-OCTANOL, ETHYLENE GLYCOL, CYCLOHEXANOL AND ETHYL CELLOSOLVE, AND MIXTURES THEREOF WITH A DILUENT, SELECTED FROM THE GROUP CONSISTING OF WATER, XYLENE AND ISOPROPYL ETHER, SAID LIQUIDS FURTHER CONTAINING AN ACID IN A CONCENTRATION OF 0.025 TO 0.2 NORMALITY AND SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, CHLOROSULFONIC ACID AND PERCHLORIC ACID, SAID LIQUIDS BEING APPLIED IN QUANTITIES 5 TO 40 TIMES THE DRY WEIGHT OF SAID CELLULOSE AND CELLULOSIC MATERIALS, PRECIPITATING THE LIGNIN PRESENT IN SAID MATERIALS BY ADDITION OF WATER, REMOVING THE PRECIPITATE, AND RECOVERING THE SACCHARIFICATION PRODUCTS, WHICH ARE SUGARS AND SUGAR GLUCOSIDES, BY CONCENTRATION AND CRYSTALLIZATION.
Claim 2
Dependent Claim
134 words
A PROCESS FOR THE SACCHARIFICATION OF CELLULOSE AND CELLULOSIC MATERIALS CONTAINING HEXOSANES AND PENTOSANES, WHICH COMPRISES HEATING SAID MATERIALS AT 120-200*C. WITH AN ALCOHOL, SELECTED FROM THE GROUP CONSISTING OF ISOPROPANOL, N-PROPANOL, N-AMYL ALCOHOL, N-OCTANOL, ETHYLENE GLYCOL, CYCLOHEXANOL AND ETHYL CELLOSOLVE, AND MIXTURES THEREOF WITH A DILUENT, SELECTED FROM THE GROUP CONSISTING OF WATER, XYLENE AND ISOPROPYL ETHER, SAID LIQUIDS FURTHER CONTAINING AN ACID IN A CONCENTRATION OF 0.025 TO 0.2 NORMALITY AND SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, CHLOROSULFONIC ACID AND PERCHLORIC ACID, SAID LIQUIDS BEING APPLIED IN QUANTITIES 5 TO 40 TIMES THE DRY WEIGHT OF SAID CELLULOSE AND CELLULOSIC MATERIALS, PRECIPITATING THE LIGNIN PRESENT IN SAID MATERIALS BY ADDITION OF WATER, REMOVING THE PRECIPITATE, AND RECOVERING THE SACCHARIFICATION PRODUCTS, WHICH ARE SUGARS AND SUGAR GLUCOSIDES, BY CONCENTRATION AND CRYSTALLIZATION.
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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) | 1963-11-08 | 1964-05-09 | 1964-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-08 | 1968-05-09 | 1968-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-08 | 1972-05-09 | 1972-11-08 | $7700.00 | Window Closed / Lapsed |