Patent US3781235A successfully refreshed from Google Patents.
US3781235A
Expired / Lapsed
US
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Method for making rigid foam and compositions using such method
Assignee: General Electric Co
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Filing: 1972-10-31
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Granted: 1973-12-25
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Expires: 1992-10-31
Abstract
Abstract A METHOD FOR MAKING RIGID FOAM IS PROVIDED BY USING AN AMINE CATALYST AND BLOWING AGENT WITH A STABLE PREMIX OF AN ISOCYANATE TERMINATED PREPOLYMER AND AN EPOXY RESIN. THE PREMIX IS STABILIZED BY THE USE OF A DICARBONYL COMPOUND, SUCH AS AN ALIPHATICALLY UNSATURATED IMIDE OR ANHYDRIDE.
Inventors
- 👤 G Trott
- 👤 W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:19
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/089; C08G18/10; C08G2110/00; C08G2110/0025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |