US2541058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of lignocellulose materials
Assignee: Wood Conversion Co
•
Filing: 1948-06-16
•
Granted: 1951-02-13
•
Expires: 1968-06-16
Abstract
No abstract record available.
Inventors
- 👤 Clark C Heritage
- 👤 William G Van Beckum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:29
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE PROCESS OF TREATING COMMINUTED LIGNOCELLULOSE RAW MATERIAL TO FORM A FIBROUS PRODUCT AND A CHEMICAL PRODUCT THEREFROM, WHICH COMPRISES THE STEPS OF REACTING AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE IN THE RANGE FROM ROOM TEMPERATURE TO ABOUT 140* C. THE LIGNOCELLULOSE MATERIAL WITH AN ALKALINE REACTING COMPOUND OF AN ALKALI METAL IN THE PRESENCE OF WATER, EXTRACTING WITH AN ESSENTIALLY AQUEOUS SOLVENT THE REACTION PRODUCTS SOLUBLE THEREIN, SEPARATING THE SOLUTION THUS OBTAINED TO LEAVE AS ONE PRODUCT THE EXTRACTED FIBROUS RESIDUE, ADJUSTING THE PH OF THE AQUEOUS SOLUTION TO A VALUE OF FROM ABOUT 7 TO ABOUT 1.5, CONDITIONING THE SAID AQUEOUS SOLUTION BY ESTABLISHING A SUBSTANTIAL QUANTITY OF SALT CONCENTRATION WHEREBY A LIGNIN MATERIAL IS PRECIPITATED, AND SEPARATING SAID LIGNIN MATERIAL AS A SECOND PRODUCT.
Claim 2
Dependent Claim
128 words
THE PROCESS OF TREATING COMMINUTED LIGNOCELLULOSE RAW MATERIAL TO FORM A FIBROUS PRODUCT AND A CHEMICAL PRODUCT THEREFROM, WHICH COMPRISES THE STEPS OF REACTING AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE IN THE RANGE FROM ROOM TEMPERATURE TO ABOUT 140* C. THE LIGNOCELLULOSE MATERIAL WITH AN ALKALINE REACTING COMPOUND OF AN ALKALI METAL IN THE PRESENCE OF WATER, EXTRACTING WITH AN ESSENTIALLY AQUEOUS SOLVENT THE REACTION PRODUCTS SOLUBLE THEREIN, SEPARATING THE SOLUTION THUS OBTAINED TO LEAVE AS ONE PRODUCT THE EXTRACTED FIBROUS RESIDUE, ADJUSTING THE PH OF THE AQUEOUS SOLUTION TO A VALUE OF FROM ABOUT 7 TO ABOUT 1.5, CONDITIONING THE SAID AQUEOUS SOLUTION BY ESTABLISHING A SUBSTANTIAL QUANTITY OF SALT CONCENTRATION WHEREBY A LIGNIN MATERIAL IS PRECIPITATED, AND SEPARATING SAID LIGNIN MATERIAL AS A SECOND PRODUCT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |