Patent US2645633A successfully refreshed from Google Patents.
US2645633A
Expired / Lapsed
US
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Process for extraction of lignin
Assignee: Masonite Corp
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Filing: 1949-11-14
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Granted: 1953-07-14
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Expires: 1969-11-14
Abstract
No abstract record available.
Inventors
- 👤 James H Richmond
- 👤 Robert M Boehm
- 👤 Hunt Harold Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:48
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
PROCESS OF EXTRACTING LIGNIN FROM HYDROLYZED LIGNOCELLULOSE MATERIAL WHICH COMPRISES SLURRYING SAID MATERIAL WITH A FORMIC ACID-WATER AZEOTROPE AT A TEMPERATURE OF ABOUT THE BOILING POINT OF THE AZEOTROPE, DISTILLING THE AZEOTROPE FROM SAID MATERIAL, RECOVERING THE LIGNIN FROM THE AZEOTROPE, AND REUSING THE AZEOTROPE TO EXTRACT LIGNIN FROM ADDITIONAL LIGNOCELLULOSE MATERIAL.
Claim 2
Dependent Claim
52 words
PROCESS OF EXTRACTING LIGNIN FROM HYDROLYZED LIGNOCELLULOSE MATERIAL WHICH COMPRISES SLURRYING SAID MATERIAL WITH A FORMIC ACID-WATER AZEOTROPE AT A TEMPERATURE OF ABOUT THE BOILING POINT OF THE AZEOTROPE, DISTILLING THE AZEOTROPE FROM SAID MATERIAL, RECOVERING THE LIGNIN FROM THE AZEOTROPE, AND REUSING THE AZEOTROPE TO EXTRACT LIGNIN FROM ADDITIONAL LIGNOCELLULOSE MATERIAL.
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) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |