US2729616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation of urea and formaldehyde
Assignee: Honeywell International Inc
•
Filing: 1952-02-28
•
Granted: 1956-01-03
•
Expires: 1972-02-28
Abstract
No abstract record available.
Inventors
- 👤 Maurice H Bigelow
- 👤 Harold N Spurlock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:45
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A METHOD OF PRODUCING A UREA-FORMALDEHYDE CONDENSATION PRODUCT THAT COMPRISES THE STEPS OF BRINGING UREA, FORMALDEHYDE AND WATER TOGETHER TO FORM AN AQUEOUS SOLUTION CONTAINING NOT LESS THAN 1.5 AND NOT MORE THEN 2.5 MOLS OF FORMALDEHYDE PER MOL OF UREA, ADJUSTING THE PH OF THE SOLUTION TO A VALUE BETWEEN 6 AND 8, SUBJECTING THE SOLUTION TO SUPERATMOSPHERIC PRESSURE, HEATING THE SOLUTION TO TEMPERATURE ABOVE ITS BOILING POINT AT ATMOSPHERIC PRESSURE TO THEREBY CAUSE THE PH TO DROP TO A VALUE AT WHICH CONDENSATION PROCEEDS, AND ARRESTING THE CONDENSATION AT THE DESIRED POINT BY COOLING THE SOLUTION.
Claim 2
Independent Claim
98 words
A METHOD OF PRODUCING A UREA-FORMALDEHYDE CONDENSATION PRODUCT THAT COMPRISES THE STEPS OF BRINGING UREA, FORMALDEHYDE AND WATER TOGETHER TO FORM AN AQUEOUS SOLUTION CONTAINING NOT LESS THAN 1.5 AND NOT MORE THEN 2.5 MOLS OF FORMALDEHYDE PER MOL OF UREA, ADJUSTING THE PH OF THE SOLUTION TO A VALUE BETWEEN 6 AND 8, SUBJECTING THE SOLUTION TO SUPERATMOSPHERIC PRESSURE, HEATING THE SOLUTION TO TEMPERATURE ABOVE ITS BOILING POINT AT ATMOSPHERIC PRESSURE TO THEREBY CAUSE THE PH TO DROP TO A VALUE AT WHICH CONDENSATION PROCEEDS, AND ARRESTING THE CONDENSATION AT THE DESIRED POINT BY COOLING THE SOLUTION.
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) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |