Patent US2304783A successfully refreshed from Google Patents.
Patent US2599550A 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 16:03
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.
References Cited (Backward Citations)
US2338637A
Cited
US2334545A
Cited
US2286228A
Cited
CH232894A
Cited
US2388235A
Cited
US2407599A
Cited
US2554475A
Cited
GB663736A
Cited
US2601598A
Cited
US2610156A
Cited
US2610170A
Cited
US2632700A
Cited
US2616874A
Cited
US2696504A
Cited
US2699435A
Cited
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 |