US2683706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of fusible lignin resins
Assignee: INSTITUT INTERNATIONAL FINANCIER
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Filing: 1950-05-31
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Granted: 1954-07-13
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Expires: 1970-05-31
Abstract
No abstract record available.
Inventors
- 👤 Muller Hans Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:06
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE PROCESS OF PREPARING FUSIBLE LIGNIN RESINS FROM LINGNIN, WOOD-HYDROLYSIS LIGNIN, LIGNIN-SULPHONIC ACID, SULPHITE WASTE LIQUOR, PEAT AND LIGNITE, COMPRISING MIXING AT LEAST ONE OF THE SAID LIGNEOUS MATERIALS WITH SUFFICIENT ALKALI METAL HYDROXIDE IN STRONG AQUEOUS SOLUTION TO REACT WITH ALL THE LIGNIN PRESENT, THE PROPORTIONS BEING OF THE ORDER OF 40 TO 400 PARTS BY WEIGHT OF THE ALKALI METAL HYDROXIDE PER 100 PARTS BY WEIGHT OF LIGNIN, HEATING THE MOIST MIXTURE TO TEMPERATURES SUBSTANTIALLY ABOVE 100* C. BUT LESS THAN 200* C. TO EVAPORATE THE MOISTURE AND TO PRODUCE A DRY RESIDUE SUBSTANTIALLY COMPLETELY SOLUBLE IN WATER, DISSOLVING THE SAID DRY RESIDUE IN WATER AND ADDING MINERAL ACID IN AN AMOUNT SUFFICIENT TO PRECIPITATE FUSIBLE LIGNIN RESIN.
Claim 2
Dependent Claim
120 words
THE PROCESS OF PREPARING FUSIBLE LIGNIN RESINS FROM LINGNIN, WOOD-HYDROLYSIS LIGNIN, LIGNIN-SULPHONIC ACID, SULPHITE WASTE LIQUOR, PEAT AND LIGNITE, COMPRISING MIXING AT LEAST ONE OF THE SAID LIGNEOUS MATERIALS WITH SUFFICIENT ALKALI METAL HYDROXIDE IN STRONG AQUEOUS SOLUTION TO REACT WITH ALL THE LIGNIN PRESENT, THE PROPORTIONS BEING OF THE ORDER OF 40 TO 400 PARTS BY WEIGHT OF THE ALKALI METAL HYDROXIDE PER 100 PARTS BY WEIGHT OF LIGNIN, HEATING THE MOIST MIXTURE TO TEMPERATURES SUBSTANTIALLY ABOVE 100* C. BUT LESS THAN 200* C. TO EVAPORATE THE MOISTURE AND TO PRODUCE A DRY RESIDUE SUBSTANTIALLY COMPLETELY SOLUBLE IN WATER, DISSOLVING THE SAID DRY RESIDUE IN WATER AND ADDING MINERAL ACID IN AN AMOUNT SUFFICIENT TO PRECIPITATE FUSIBLE LIGNIN RESIN.
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) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |