US2668155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urea-formaldehyde primary alkylene diamine condensation products
Assignee: EIDP Inc
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Filing: 1950-04-07
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Granted: 1954-02-02
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Expires: 1970-04-07
Abstract
No abstract record available.
Inventors
- 👤 Mcclellan William Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:21
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/043; C08G12/046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A CONDENSATION PRODUCT OBTAINED BY HEATING IN AQUEOUS MEDIUM AT LESS THAN ABOUT 85* C. UNTIL A CLEAR SOLUTION HAVING A PH BETWEEN 5.0 AND 6.5 IS FORMED UREA, AND PER MOLE OF UREA, 1.5 TO 2.5 MOLES OF FORMALDEHYDE, AND 0.0O TO 0.12 MOLE OF A PRIMARY ALKYLENE DIAMINE CONTAINING FROM 4 TO 10 CARBON ATOMS, INCLUSIVE, AND IN WHICH THE PRIMARY AMINO GROUPS ARE SEPARATED BY AT LEAST 4 CARBON ATOMS, AND AN ACID CATALYTICALLY ACTIVE FOR THE CONDENSATION OF UREA WITH FORMALDEHYDE IN AN AMOUNT STOICHIOMETRICALLY EQUIVALENT TO 2.5% TO 12.5% OF SAID DIAMINE, THE PROPORTION AND CHARACTER OF SAID ACID BEING SUCH THAT THE PH OF SAID AQUEOUS MEDIUM IS LOWERED TO AT LEAST 6.5 UPON HEATING.
Claim 2
Dependent Claim
121 words
A CONDENSATION PRODUCT OBTAINED BY HEATING IN AQUEOUS MEDIUM AT LESS THAN ABOUT 85* C. UNTIL A CLEAR SOLUTION HAVING A PH BETWEEN 5.0 AND 6.5 IS FORMED UREA, AND PER MOLE OF UREA, 1.5 TO 2.5 MOLES OF FORMALDEHYDE, AND 0.0O TO 0.12 MOLE OF A PRIMARY ALKYLENE DIAMINE CONTAINING FROM 4 TO 10 CARBON ATOMS, INCLUSIVE, AND IN WHICH THE PRIMARY AMINO GROUPS ARE SEPARATED BY AT LEAST 4 CARBON ATOMS, AND AN ACID CATALYTICALLY ACTIVE FOR THE CONDENSATION OF UREA WITH FORMALDEHYDE IN AN AMOUNT STOICHIOMETRICALLY EQUIVALENT TO 2.5% TO 12.5% OF SAID DIAMINE, THE PROPORTION AND CHARACTER OF SAID ACID BEING SUCH THAT THE PH OF SAID AQUEOUS MEDIUM IS LOWERED TO AT LEAST 6.5 UPON HEATING.
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) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |