US3216839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free lignin solutions and method of making and using same
Assignee: West Virginia Pulp and Paper Co
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Filing: 1960-03-22
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Granted: 1965-11-09
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Expires: 1980-03-22
Abstract
No abstract record available.
Inventors
- 👤 Webster David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:59
CPC Classifications
C; C08; C08L; C08L61/00; C08L61/04; C08L61/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
THE METHOD OF DISSOLVING FREE ALKALI LIGNIN IN ITS ENTIRETY IN A LIQUID SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, METHANOL-WATER CONTAINING NOT MORE THAN 10% BY WEIGHT OF WATER, ETHANOL, ETHANOLEWATER CONTAINING NOT MORE THAN 30% BY WEIGHT OF WATER AND ISOPROPANOL-WATER CONTAINING FROM ABOUT 20 TO 35% BY WEIGHT OF WATER WHERE SAID LIGNIN IS ONLY PARTIALLY SOLUBLE IN SAID SOLVENT AT SOLIDS CONCENTRATIONS OF LESS THAN 35% WHICH COMPRISES ADDING TO SAID SOLVENT A QUANTITY OF SAID LIGNIN IN EXCESS OF 35 PARTS BY WEIGHT PER 65 PARTS BY WEIGHT OF SAID SOLVENT.
Claim 2
Independent Claim
97 words
THE METHOD OF DISSOLVING FREE ALKALI LIGNIN IN ITS ENTIRETY IN A LIQUID SOLVENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, METHANOL-WATER CONTAINING NOT MORE THAN 10% BY WEIGHT OF WATER, ETHANOL, ETHANOLEWATER CONTAINING NOT MORE THAN 30% BY WEIGHT OF WATER AND ISOPROPANOL-WATER CONTAINING FROM ABOUT 20 TO 35% BY WEIGHT OF WATER WHERE SAID LIGNIN IS ONLY PARTIALLY SOLUBLE IN SAID SOLVENT AT SOLIDS CONCENTRATIONS OF LESS THAN 35% WHICH COMPRISES ADDING TO SAID SOLVENT A QUANTITY OF SAID LIGNIN IN EXCESS OF 35 PARTS BY WEIGHT PER 65 PARTS BY WEIGHT OF SAID SOLVENT.
Claim 3
Dependent Claim
17 words
A SOLUTION PREPARED BY THE METHOD OF CLAIM 1 HAVING A SOLIDS CONTENT ABOUT 35% BY WEIGHT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |