US2802815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali treated lignin and method of making same
Assignee: West Virginia Pulp and Paper Co
•
Filing: 1953-02-02
•
Granted: 1957-08-13
•
Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 Doughty Joseph Bayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:20
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
THE METHOD OF MODIFYING LIGNIN OBTAINED FROM THE ALKALINE PULPING OF WOOD TO PRODUCE A LIGNIN WHICH HAS ITS ACETONE SOLUBILITY INCREASED FROM AN INITIAL VALUE OF FROM 20-80% TO GIVE INCREASED SOLUBILITY THEREOF IN METHYL-ETHYL KETONE, INCREASED SHELF LIFE OF ALKALINE SOLUTIONS THEREOF, AND OF MIXTURES THEREWITH OF NEOPRENE LATEX, WHICH COMPRISES HEATING AN AQUEOUS SOLUTION OF SAID LIGNIN IN ALKALI METAL HYDROXIDE SOLUTION TO WITHIN THE APPROXIMATE RANGE OF 140-250*C. AND MAINTAINING SUCH TEMPERATURE UNTIL THE ACETONE SOLUBILITY AS SHOWN BY TEST IS INCREASED TO THE DESIRED VALUE UP TO SUBSTANTIALLY COMPLETE SOLUBILITY BUT STOPPING THE REACTION BEFORE APPRECIABLE DESTRUCTION OF THE LIGNIN-LIKE CHARACTER OF THE PRODUCT TAKES PLACE, THE AMOUNT OF ALKALI USED BEING ON THE ORDER OF FROM 0.3 TO 0.4 POUND PER POUND OF LIGNIN STARTED WITH.
Claim 2
Independent Claim
132 words
THE METHOD OF MODIFYING LIGNIN OBTAINED FROM THE ALKALINE PULPING OF WOOD TO PRODUCE A LIGNIN WHICH HAS ITS ACETONE SOLUBILITY INCREASED FROM AN INITIAL VALUE OF FROM 20-80% TO GIVE INCREASED SOLUBILITY THEREOF IN METHYL-ETHYL KETONE, INCREASED SHELF LIFE OF ALKALINE SOLUTIONS THEREOF, AND OF MIXTURES THEREWITH OF NEOPRENE LATEX, WHICH COMPRISES HEATING AN AQUEOUS SOLUTION OF SAID LIGNIN IN ALKALI METAL HYDROXIDE SOLUTION TO WITHIN THE APPROXIMATE RANGE OF 140-250*C. AND MAINTAINING SUCH TEMPERATURE UNTIL THE ACETONE SOLUBILITY AS SHOWN BY TEST IS INCREASED TO THE DESIRED VALUE UP TO SUBSTANTIALLY COMPLETE SOLUBILITY BUT STOPPING THE REACTION BEFORE APPRECIABLE DESTRUCTION OF THE LIGNIN-LIKE CHARACTER OF THE PRODUCT TAKES PLACE, THE AMOUNT OF ALKALI USED BEING ON THE ORDER OF FROM 0.3 TO 0.4 POUND PER POUND OF LIGNIN STARTED WITH.
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) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |