Patent US2769799A successfully refreshed from Google Patents.
US2769799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamine modified melamine resins
Assignee: Wyeth Holdings LLC
•
Filing: 1953-03-20
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Granted: 1956-11-06
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Expires: 1973-03-20
Abstract
No abstract record available.
Inventors
- 👤 Suen Tzeng Jiueq
- 👤 Jen Yun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:46
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/26; C08G12/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
THE PROCESS OF PREPARING A WATER-SOLUBLE RESINOUS MATERIAL WHICH COMPRISES REACTING MELAMINE, FORMALDEHYDE AND A POLYFUNCTIONAL ALIPHATIC POLYAMINE AT A TEMPERATURE BETWEEN ABOUT 20* C. AND ABOUT 100* C. UNTIL A VISCOSITY OF BETWEEN ABOUT 20 CENTIPOISES AND ABOUT 800 CENTIPOISES MEASURED AT 35% SOLIDS AND 25* C. IS OBTAINED, THEREAFTER NEUTRALIZING SAID RESINOUS MATERIAL WHEREIN THE FORMALDEHYDE IS PRESENT IN AN AMOUNT GREATER THAN 6 MOLS PER MOL OF MELAMINE, WHEREIN SAID POLYAMINE HAS A CARBON TO NITROGEN RATIO NOT GREATER THAN 4:1, RESPECTIVELY, AND THE POLYFUNCTIONAL ALIPHATIC POLYAMINE IS PRESENT IN AN AMOUNT OF YIELD BETWEEN ABOUT 0.5 AND ABOUT 10 ATOMS OF NITROGEN PER MOL OF MELAMINE, AND WHEREIN THE PRODUCT PRODUCED IS INFINITELY DILUTABLE IN NEUTRALIZING WATER AT A TEMPERATURE BETWEEN ABOUT 25* C. AND 30* C.
Claim 2
Dependent Claim
131 words
THE PROCESS OF PREPARING A WATER-SOLUBLE RESINOUS MATERIAL WHICH COMPRISES REACTING MELAMINE, FORMALDEHYDE AND A POLYFUNCTIONAL ALIPHATIC POLYAMINE AT A TEMPERATURE BETWEEN ABOUT 20* C. AND ABOUT 100* C. UNTIL A VISCOSITY OF BETWEEN ABOUT 20 CENTIPOISES AND ABOUT 800 CENTIPOISES MEASURED AT 35% SOLIDS AND 25* C. IS OBTAINED, THEREAFTER NEUTRALIZING SAID RESINOUS MATERIAL WHEREIN THE FORMALDEHYDE IS PRESENT IN AN AMOUNT GREATER THAN 6 MOLS PER MOL OF MELAMINE, WHEREIN SAID POLYAMINE HAS A CARBON TO NITROGEN RATIO NOT GREATER THAN 4:1, RESPECTIVELY, AND THE POLYFUNCTIONAL ALIPHATIC POLYAMINE IS PRESENT IN AN AMOUNT OF YIELD BETWEEN ABOUT 0.5 AND ABOUT 10 ATOMS OF NITROGEN PER MOL OF MELAMINE, AND WHEREIN THE PRODUCT PRODUCED IS INFINITELY DILUTABLE IN NEUTRALIZING WATER AT A TEMPERATURE BETWEEN ABOUT 25* C. AND 30* C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |