Patent US2974067A successfully refreshed from Google Patents.
US2974067A
Expired / Lapsed
US
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Hydrolysis of vegetable cellulosic materials
Assignee: Udic SA
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Filing: 1958-02-11
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Granted: 1961-03-07
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Expires: 1978-02-11
Abstract
No abstract record available.
Inventors
- 👤 Apel Alfons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:48
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
A METHOD OF HYDROLYZING CELLULOSIC LIGNIN-CONTAIN ING MATERIALS COMPRISING TREATING SAID MATERIALS AT A TEMPERATURE OF ABOUT 15 TO 30*C. WITH A HYDROCHLORIC ACID SOLUTION OF ABOUT 38 TO 42 PERCENT BY WEIGHT OF HC1 IN A SUBSTANTIALLY ANYDROUS ALIPHATIC ALCOHOL CONTAINING 1 TO 3 C ATOMS, THEREBY OBTAINING ESSENTIALLY PURE CELLULOSE AND A SOLUTION OF SUGARS AND LIGNIN, SEPARATING SAID SOLUTION FROM THE CELLULOSE, DILUTING THE SOLUTION WITH WATER TO PRECIPITATE THE LIGNIN, HEATING THE LIGNIN-FREE SOLUTION TO EVAPORATE THE ALCOHOL AND HYDROCHLORIC ACID, AND RECOVERING THE SUGARS REMAINING IN THE RESIDUE FROM SAID EVAPORATION.
References Cited (Backward Citations)
US1795166A
Cited
US1964646A
Cited
US1919623A
Cited
US1963972A
Cited
US2465347A
Cited
US2526607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |