Patent US3284379A successfully refreshed from Google Patents.
US3284379A
Expired / Lapsed
US
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Urea-formaldehyde foam
Assignee: Arthur D Little Inc
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Filing: 1963-03-13
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Granted: 1966-11-08
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Expires: 1983-03-13
Abstract
No abstract record available.
Inventors
- 👤 Brasco Frederick
- 👤 Philip R Temple
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J2361/00; Y; Y10; Y10S; Y10S264/00; Y10S264/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD FOR MAKING A UREA-FORMALDEHYDE FOAM SUBSTANTIALLY FREE FROM CRACKING UPON DRYING IN ITS FINAL FORM, COMPRISING THE STEPS OF (A) FORMING A UREA-FORMALDEHYDE FOAM INTO A SELFSUPPORTING WET MASS CONTAINING AN ACID CATALYST CAPABLE OF CURING SAID UREA FORMALDEHYDE; AND (B) WHILE SAID FOAM IS STILL WET, EXPOSING IT TO GESEOUS AMMONIA THEREBY TO NEUTRALIZE AT LEAST A PORTION OF ANY OF SAID UNREACTED ACID, SAID NEUTRALIZATION BEING CARRIED OUT UNTIL THE PH OF SAID FOAM IS RAISED TO A VALUE OF AT LEAST 5.
Claim 2
Independent Claim
87 words
A METHOD FOR MAKING A UREA-FORMALDEHYDE FOAM SUBSTANTIALLY FREE FROM CRACKING UPON DRYING IN ITS FINAL FORM, COMPRISING THE STEPS OF (A) FORMING A UREA-FORMALDEHYDE FOAM INTO A SELFSUPPORTING WET MASS CONTAINING AN ACID CATALYST CAPABLE OF CURING SAID UREA FORMALDEHYDE; AND (B) WHILE SAID FOAM IS STILL WET, EXPOSING IT TO GESEOUS AMMONIA THEREBY TO NEUTRALIZE AT LEAST A PORTION OF ANY OF SAID UNREACTED ACID, SAID NEUTRALIZATION BEING CARRIED OUT UNTIL THE PH OF SAID FOAM IS RAISED TO A VALUE OF AT LEAST 5.
References Cited (Backward Citations)
US3138563A
Cited
US3189479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |