US2529856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes of preparing water-soluble melamine-formaldehyde resins and products thereof
Assignee: Wyeth Holdings LLC
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Filing: 1944-12-18
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Granted: 1950-11-14
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Expires: 1964-12-18
Abstract
No abstract record available.
Inventors
- 👤 Herbert J West
- 👤 William T Watt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:23
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08G12/42; C08G12/424; C08G12/425; C08G12/427
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
THE PROCESS WHICH COMPRISES REFLUXING A MIXTURE OF METHYL ALCOHOL WITH AN ACIDIFIED POLYMETHYLOL MELAMINE UNTIL A CLEAR SOLUTION IS OBTAINED, SUBSTANTIALLY IMMEDIATELY NEUTRAILIZING THE SOLUTION BY THE ADDITION OF AN ALKALINE MATERIAL, AND DEHYDRATING THE NEUTRALIZED SOLUTION TO GIVE A PRODUCT WHICH IN ITS DRY FORM IS A RESINOUS SOLID AT ROOM TEMPERATURES AND WHICH IS SUBSTANTIALLY INFINITELY MISCIBLE WITH WATER AT ROOM TEMPERATURES, THE DEHYDRATION BEING EFFECTED UNDER HEAT AND UNDER A VACUUM SUFFICIENTLY HIGH SO THAT THE TEMPERATURE OF THE HEATED MASS DOES NOT SUBSTANTIALLY EXCEED 90*C. DURING DEHYDRATION.
Claim 2
Dependent Claim
92 words
THE PROCESS WHICH COMPRISES REFLUXING A MIXTURE OF METHYL ALCOHOL WITH AN ACIDIFIED POLYMETHYLOL MELAMINE UNTIL A CLEAR SOLUTION IS OBTAINED, SUBSTANTIALLY IMMEDIATELY NEUTRAILIZING THE SOLUTION BY THE ADDITION OF AN ALKALINE MATERIAL, AND DEHYDRATING THE NEUTRALIZED SOLUTION TO GIVE A PRODUCT WHICH IN ITS DRY FORM IS A RESINOUS SOLID AT ROOM TEMPERATURES AND WHICH IS SUBSTANTIALLY INFINITELY MISCIBLE WITH WATER AT ROOM TEMPERATURES, THE DEHYDRATION BEING EFFECTED UNDER HEAT AND UNDER A VACUUM SUFFICIENTLY HIGH SO THAT THE TEMPERATURE OF THE HEATED MASS DOES NOT SUBSTANTIALLY EXCEED 90*C. DURING DEHYDRATION.
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) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |