Patent US1575557A successfully refreshed from Google Patents.
Patent US3335113A successfully refreshed from Google Patents.
US3335113A
Expired / Lapsed
US
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Process for preparing polymethylol ureas
Assignee: Wyeth Holdings LLC
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Filing: 1962-12-06
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Granted: 1967-08-08
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Expires: 1982-12-06
Abstract
No abstract record available.
Inventors
- 👤 John P Dundon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:13
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR PREPARING A WATER-SOLUBLE STABLE UREAFORMALDEHYDE CONDENSATION PRODUCT WHICH COMPRISES REACTING RELATIVE AMOUNTS OF ONE MOLE OF UREA WITH FROM 4.2 TO 4.6 MOLES OF FORMALDEHYDE AT A PH ABOVE 10 IN THE PRESENCE OF AN AMOUNT OF ALKALI THAT DOES NOT EXCEED THE EQUVALENT OF .1 MOLE SODIUM HYDROXIDE PER MOLE OF UREA, AND A TEMPERATURE OF FROM 60 TO 80*C. UNTIL THE MOLES OF COMBINED FORMALDEHYDE PER MOLE OF UREA ARE FROM ABOUT 3.6 TO ABOUT 3.8, ADJUSTING THE PH OF THE REACTION MIXTURE TO FROM 1 TO ABOUT 8.5, ADDING UREA IN AN AMOUNT UP TO 0.3 MOLE PER MOLE OF INITIAL UREA TO REACT WITH FREE FORMALDEHYDE PRESENT AND THEREBY REDUCE THE FREE FORMALDEHYDE CONTENT BELOW 3%.
Claim 2
Dependent Claim
123 words
A PROCESS FOR PREPARING A WATER-SOLUBLE STABLE UREAFORMALDEHYDE CONDENSATION PRODUCT WHICH COMPRISES REACTING RELATIVE AMOUNTS OF ONE MOLE OF UREA WITH FROM 4.2 TO 4.6 MOLES OF FORMALDEHYDE AT A PH ABOVE 10 IN THE PRESENCE OF AN AMOUNT OF ALKALI THAT DOES NOT EXCEED THE EQUVALENT OF .1 MOLE SODIUM HYDROXIDE PER MOLE OF UREA, AND A TEMPERATURE OF FROM 60 TO 80*C. UNTIL THE MOLES OF COMBINED FORMALDEHYDE PER MOLE OF UREA ARE FROM ABOUT 3.6 TO ABOUT 3.8, ADJUSTING THE PH OF THE REACTION MIXTURE TO FROM 1 TO ABOUT 8.5, ADDING UREA IN AN AMOUNT UP TO 0.3 MOLE PER MOLE OF INITIAL UREA TO REACT WITH FREE FORMALDEHYDE PRESENT AND THEREBY REDUCE THE FREE FORMALDEHYDE CONTENT BELOW 3%.
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) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |