US2554475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cationic ureaformaldehyde resins and products obtained thereby
Assignee: Wyeth Holdings LLC
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Filing: 1947-03-05
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Granted: 1951-05-22
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Expires: 1967-03-05
Abstract
No abstract record available.
Inventors
- 👤 Suen Tzeng-Jiueq
- 👤 Jr John H Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:22
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/043; C08G12/046; C08G12/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS COMPRISING REACTING UREA AND AN AQUEOUS SOLUTION OF FORMALDEHYDE AT A TEMPERATURE OF ABOUT 70-80* C. FOR 15-30 MINUTES UNDER ALKALINE CONDITIONS WHEREIN THE MOL RATIO OF UREA TO FORMALDEHYDE IS BETWEEN 1:2 TO 1:2.8 ADDING THERETO 2%-8% OF A POLYFUNCTIONAL AMINE BASED ON THE WEIGHT OF UREA, ADJUSTING THE PH TO BETWEEN 1 TO 4 AND REACTING BY HEATING AT A TEMPERATURE OF FROM 68* C. TO REFLUX TEMPERATURES FOR 15-80 MINUTES SO THAT THERE IS NO VISCOSITY INCREASE AND REDUCING THE TEMPERATURE TO A POINT WITHIN THE RANGE OF ROOM TEMPERATURE TO 55* C. TO EFFECT VISCOSITY INCREASE.
Claim 2
Dependent Claim
102 words
A PROCESS COMPRISING REACTING UREA AND AN AQUEOUS SOLUTION OF FORMALDEHYDE AT A TEMPERATURE OF ABOUT 70-80* C. FOR 15-30 MINUTES UNDER ALKALINE CONDITIONS WHEREIN THE MOL RATIO OF UREA TO FORMALDEHYDE IS BETWEEN 1:2 TO 1:2.8 ADDING THERETO 2%-8% OF A POLYFUNCTIONAL AMINE BASED ON THE WEIGHT OF UREA, ADJUSTING THE PH TO BETWEEN 1 TO 4 AND REACTING BY HEATING AT A TEMPERATURE OF FROM 68* C. TO REFLUX TEMPERATURES FOR 15-80 MINUTES SO THAT THERE IS NO VISCOSITY INCREASE AND REDUCING THE TEMPERATURE TO A POINT WITHIN THE RANGE OF ROOM TEMPERATURE TO 55* C. TO EFFECT VISCOSITY INCREASE.
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) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |