US2734836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pentoses from cellulosic materials
Assignee: —
•
Filing: —
•
Granted: 1956-02-14
•
Expires: 1973-02-14
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:53
CPC Classifications
C; C13; C13K; C13K13/00; C13K13/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A METHOD OF MAKING PENTOSES BY THE TREATMENT OF PENTOSAN-CONTAINING CELLULOSIC MATERIAL WITH AN ORGANIC ACID, THE STEPS OF CHARGING THE SAID MATERIALS INTO A CLOSED EXTRACTION VESSEL, CONTINUOUSLY EXTRACTING THE SAME WITH ACETIC ACID HAVING A PH BETWEEN 2 AND 4 AT A TEMPERATURE BETWEEN 80 AND 100* C. THE EXTRACTION LIQUID BEING CONDUCTED THROUGH SAID VESSEL IN A CLOSED CYCLE, PRODUCING THEREBY A PENTOSE-CONTAINING SOLUTION, NEUTRALIZING AND EVAPORATING SAID SOLUTION AND RECOVERING THE PENTOSES BY EXTRACTION OF THE RESIDUAL PRODUCT.
Claim 2
Dependent Claim
83 words
IN A METHOD OF MAKING PENTOSES BY THE TREATMENT OF PENTOSAN-CONTAINING CELLULOSIC MATERIAL WITH AN ORGANIC ACID, THE STEPS OF CHARGING THE SAID MATERIALS INTO A CLOSED EXTRACTION VESSEL, CONTINUOUSLY EXTRACTING THE SAME WITH ACETIC ACID HAVING A PH BETWEEN 2 AND 4 AT A TEMPERATURE BETWEEN 80 AND 100* C. THE EXTRACTION LIQUID BEING CONDUCTED THROUGH SAID VESSEL IN A CLOSED CYCLE, PRODUCING THEREBY A PENTOSE-CONTAINING SOLUTION, NEUTRALIZING AND EVAPORATING SAID SOLUTION AND RECOVERING THE PENTOSES BY EXTRACTION OF THE RESIDUAL PRODUCT.
References Cited (Backward Citations)
FR541048A
Cited
US985725A
Cited
US1190953A
Cited
US1816136A
Cited
US1851822A
Cited
US1906429A
Cited
US1936190A
Cited
US1969600A
Cited
GB481082A
Cited
US2284500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-13 | 1959-08-15 | 1960-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-13 | 1963-08-15 | 1964-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-13 | 1967-08-15 | 1968-02-14 | $7700.00 | Window Closed / Lapsed |