US2615883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lignin, cellulose, and pentosans
Assignee: IOWA STATE COLLEGE RES FOUND
•
Filing: 1947-09-19
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Granted: 1952-10-28
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Expires: 1967-09-19
Abstract
No abstract record available.
Inventors
- 👤 Orland R Sweeney
- 👤 Melvin H Brown
- 👤 Lionel K Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:45
CPC Classifications
D; D21; D21C; D21C5/00; C; C08; C08B; C08B1/00; C08B37/00; C08B37/0006; C08B37/0057; C08H; C08H6/00; D21C3/00; D21C3/22; D21C3/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS FOR THE TREATMENT OF CROP BYPRODUCTS CONTAINING CELLULOSE, LIGNINS AND PENTOSANS TO RECOVER ALL OF SAID CONSTITUENTS FROM A SINGLE BATCH OF RAW MATERIAL, THE STEPS OF ACIDTREATING SUCH A PRODUCT BY CONTACTING IT WITH AN ACID SOLUTION TO EXTRACT THE PENTOSANS INTO THE ACID SOLUTION, WITHDRAWING THE PENTOSAN-CONTAINING ACID SOLUTION FROM THE SOLIDS, SEPARATING THE PENTOSANS FROM THE WITHDRAWN SOLUTION, DIGESTING SAID SOLIDS IN AN ALKALINE SOLUTION TO REMOVE THE LIGNINS, WITHDRAWING THE SOLUTION FROM THE CELLULOSE, AND SEPARATING THE LIGNINS FROM THE LATTER SOLUTION.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR THE TREATMENT OF CROP BYPRODUCTS CONTAINING CELLULOSE, LIGNINS AND PENTOSANS TO RECOVER ALL OF SAID CONSTITUENTS FROM A SINGLE BATCH OF RAW MATERIAL, THE STEPS OF ACIDTREATING SUCH A PRODUCT BY CONTACTING IT WITH AN ACID SOLUTION TO EXTRACT THE PENTOSANS INTO THE ACID SOLUTION, WITHDRAWING THE PENTOSAN-CONTAINING ACID SOLUTION FROM THE SOLIDS, SEPARATING THE PENTOSANS FROM THE WITHDRAWN SOLUTION, DIGESTING SAID SOLIDS IN AN ALKALINE SOLUTION TO REMOVE THE LIGNINS, WITHDRAWING THE SOLUTION FROM THE CELLULOSE, AND SEPARATING THE LIGNINS FROM THE LATTER SOLUTION.
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) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |