US2829126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous compositions
Assignee: Wyeth Holdings LLC
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Filing: 1953-09-10
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Granted: 1958-04-01
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Expires: 1973-09-10
Abstract
No abstract record available.
Inventors
- 👤 Suen Tzeng Jiueq
- 👤 Jen Yun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:46
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/043; C08G12/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR PREPARING A RESINOUS COMPOSITION WHICH COMPRISES REACTING UREA WITH FORMALDEHYDE IN AN AQUEOUS ALKALINE MEDIUM TO PRODUCE METHYLOLATED UREA, ACIDIFYING THE REACTION MIXTURE TO A PH BETWEEN ABOUT 3 AND ABOUT 6.5, FURTHER REACTING THE MIXTURE UNTIL THE CONDENSATION PRODUCT HYDROPHOBES AT A FIRST-STAGE TEMPERATURE BETWEEN ABOUT 0 AND ABOUT 70 DEGREES CENTIGRADE, SUBSTANTIALLY NEUTRALIZING THE REACTION MIXTURE, ADDING THERETO BETWEEN ABOUT 0.2 AND ABOUT 2.0 MOLS OF DICYANDIAMIDE PER MOL OF UREA CHARGED, FURTHER REACTING THE RESULTING MIXTURE UNTIL THE PRODUCT HYDROPHOBES AT A SECOND-STAGE TEMPERATURE HIGHER THAN THE FIRST-STAGE HYDROPHATE TEMPERATURE AND BETWEEN ABOUT 50 AND ABOUT 90 DEGREES CENTRIGRADE, WHEREIN THE TOTAL FORMALDEHYDE CHARGED AMOUNTS TO BETWEEN ABOUT 1.4 AND ABOUT 3.0 MOLS PER MOL OF UREA CHARGED.
Claim 2
Dependent Claim
124 words
A PROCESS FOR PREPARING A RESINOUS COMPOSITION WHICH COMPRISES REACTING UREA WITH FORMALDEHYDE IN AN AQUEOUS ALKALINE MEDIUM TO PRODUCE METHYLOLATED UREA, ACIDIFYING THE REACTION MIXTURE TO A PH BETWEEN ABOUT 3 AND ABOUT 6.5, FURTHER REACTING THE MIXTURE UNTIL THE CONDENSATION PRODUCT HYDROPHOBES AT A FIRST-STAGE TEMPERATURE BETWEEN ABOUT 0 AND ABOUT 70 DEGREES CENTIGRADE, SUBSTANTIALLY NEUTRALIZING THE REACTION MIXTURE, ADDING THERETO BETWEEN ABOUT 0.2 AND ABOUT 2.0 MOLS OF DICYANDIAMIDE PER MOL OF UREA CHARGED, FURTHER REACTING THE RESULTING MIXTURE UNTIL THE PRODUCT HYDROPHOBES AT A SECOND-STAGE TEMPERATURE HIGHER THAN THE FIRST-STAGE HYDROPHATE TEMPERATURE AND BETWEEN ABOUT 50 AND ABOUT 90 DEGREES CENTRIGRADE, WHEREIN THE TOTAL FORMALDEHYDE CHARGED AMOUNTS TO BETWEEN ABOUT 1.4 AND ABOUT 3.0 MOLS PER MOL OF UREA CHARGED.
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) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |