US2521532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lignin resins and process of making same
Assignee: Masonite Corp
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Filing: 1946-07-27
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Granted: 1950-09-05
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Expires: 1966-07-27
Abstract
No abstract record available.
Inventors
- 👤 Harry A Mitman
- 👤 Raymond N Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:17
CPC Classifications
C; C08; C08G; C08G16/00; C08G16/02; C08G16/0293
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE PROCESS OF PREPARING A RESINOUS MATERIAL WHICH COMPRISES HEATING LIGNIN, FURFURYL ALCOHOL AND FORMALDEHYDE CONTAINING WATER IN THE PRESENCE OF AN ACID CATALYST UNTIL THE FLUID RESIN FORMATION HAS ADVANCED TO THE INTERMEDIATE STATE, ADDING A COMPOUND CHOSEN FROM THE GROUP CONSISTING OF HYDROXIDES AND CARBONATES OF ALKALI METALS AND ALKALINE EARTH METALS TO REACT WITH THE ACID CATALYST TO PRECIPITATE A METAL SALT, REMOVING THE WATER FROM THE RESIN, DISSOLVING THE RESIN IN AN ORGANIC SOLVENT, REMOVING THE PRECIPITATED SALT FROM THE RESIN SOLUTION, AND HEATING THE FLUID RESIN TO FORM A SUBSTANTIALLY THERMOSET RESIN.
Claim 2
Dependent Claim
97 words
THE PROCESS OF PREPARING A RESINOUS MATERIAL WHICH COMPRISES HEATING LIGNIN, FURFURYL ALCOHOL AND FORMALDEHYDE CONTAINING WATER IN THE PRESENCE OF AN ACID CATALYST UNTIL THE FLUID RESIN FORMATION HAS ADVANCED TO THE INTERMEDIATE STATE, ADDING A COMPOUND CHOSEN FROM THE GROUP CONSISTING OF HYDROXIDES AND CARBONATES OF ALKALI METALS AND ALKALINE EARTH METALS TO REACT WITH THE ACID CATALYST TO PRECIPITATE A METAL SALT, REMOVING THE WATER FROM THE RESIN, DISSOLVING THE RESIN IN AN ORGANIC SOLVENT, REMOVING THE PRECIPITATED SALT FROM THE RESIN SOLUTION, AND HEATING THE FLUID RESIN TO FORM A SUBSTANTIALLY THERMOSET 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) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |