US2789095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing urea-formaldehyde solid foam
Assignee: EIDP Inc
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Filing: 1952-11-22
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Granted: 1957-04-16
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Expires: 1972-11-22
Abstract
No abstract record available.
Inventors
- 👤 Philip E Lindvig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:50
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; B; B01; B01J; B01J10/00; B01J10/002; C08J9/143; C08J9/147; C08J2361/00; C08J2361/20; C08J2361/22; C08J2361/24; Y; Y10; Y10S; Y10S264/00; Y10S264/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A PROCESS FOR PREPARING A SOLID UREA-FORMALDEHYDE FOAM WHICH COMPRISES EMULSIFYING AN INERT ORGANIC WATER-INSOLUBLE LIQUID IN AN AQUEOUS UREA-FORMALDEHYDE SOLUTION HAVING A VISCOSITY WITHIN THE RANGE OF 200 TO 10,000 CENTIPOISES, THE QUANTITY OF SAID LIQUID BEING FROM 0.02 TO 0.30 PART BY WEIGHT PER UNIT WEIGHT OF UREAFORMALDEHYDE, SAID EMULSIFICATION BEING CARRIED OUT IN THE PRESENCE OF AN EMULSIFYING AGENT, MIXING THE RESULTING EMULSION AT A TEMPERATURE BELOW THE VAPORIZATION TEMPERATURE OF SAID LIQUID WITH AN ACIDIC UREA-FORMALDEHYDECURING CATALYST, WHEREBY CURING OF THE UREA-FORMALDEHYDE COMMENCES, THEREUPON HEATING THE MIXTURE TO PRODUCE VAPORIZATION OF THE SAID LIQUID, AND SUBJECTING THE RESULTANT MIXTURE, MADE UP OF CELLS CONTAINING THE SAID VAPORS, TO THE HARDENING ACTION OF SAID ACID-CURING CATALYST BY MAINTAINING THE MIXTURE AT A CURING TEMPERATURE ABOVE THE BOILING POINT OF THE SAID INERT ORGANIC LIQUID SAID CURING TEMPERATURE BEING WITHIN THE RANGE OF 15* TO 115*C. WHEREBY A SOLID FOAM OF SUBSTANTIALLY CLOSED CELL STRUCTURE IS OBTAINED.
Claim 2
Dependent Claim
159 words
A PROCESS FOR PREPARING A SOLID UREA-FORMALDEHYDE FOAM WHICH COMPRISES EMULSIFYING AN INERT ORGANIC WATER-INSOLUBLE LIQUID IN AN AQUEOUS UREA-FORMALDEHYDE SOLUTION HAVING A VISCOSITY WITHIN THE RANGE OF 200 TO 10,000 CENTIPOISES, THE QUANTITY OF SAID LIQUID BEING FROM 0.02 TO 0.30 PART BY WEIGHT PER UNIT WEIGHT OF UREAFORMALDEHYDE, SAID EMULSIFICATION BEING CARRIED OUT IN THE PRESENCE OF AN EMULSIFYING AGENT, MIXING THE RESULTING EMULSION AT A TEMPERATURE BELOW THE VAPORIZATION TEMPERATURE OF SAID LIQUID WITH AN ACIDIC UREA-FORMALDEHYDECURING CATALYST, WHEREBY CURING OF THE UREA-FORMALDEHYDE COMMENCES, THEREUPON HEATING THE MIXTURE TO PRODUCE VAPORIZATION OF THE SAID LIQUID, AND SUBJECTING THE RESULTANT MIXTURE, MADE UP OF CELLS CONTAINING THE SAID VAPORS, TO THE HARDENING ACTION OF SAID ACID-CURING CATALYST BY MAINTAINING THE MIXTURE AT A CURING TEMPERATURE ABOVE THE BOILING POINT OF THE SAID INERT ORGANIC LIQUID SAID CURING TEMPERATURE BEING WITHIN THE RANGE OF 15* TO 115*C. WHEREBY A SOLID FOAM OF SUBSTANTIALLY CLOSED CELL STRUCTURE IS OBTAINED.
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) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |