US3554939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of a polyimide foam
Assignee: Monsanto Co
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Filing: 1969-05-20
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Granted: 1971-01-12
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Expires: 1989-05-20
Abstract
Abstract DISCLOSED HEREIN IS A PROCESS FOR THE PREPARATION OF A POLYIMIDE FOAM WHICH COMPRISES PREPARING A FOAMABLE POLYMER FORMING COMPOSITION BY INTIMATELY MIXING AN ESTER DERIVATIVE OF BENZOPHENONE TETRACARBOXYLIC ACID AND A POLYAMINE HAVING AT LEAST TWO PRIMARY AMINO GROUPS PER MOLECULE TO FORM A SYSTEM HAVING A VOLATILE CONTENT OF AT LEAST 9% AND THEN HEATING THIS SYSTEM AT A TEMPERATURE AT WHICH FOAMING OCCURS CONTEMPORANEOUSLY WITH THE POLYMERIZATIONOF THE REACTANTS.
Inventors
- 👤 Edward Lavin
- 👤 Irving Serlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:40
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/142; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028; C08J2379/00; C08J2379/04; C08J2379/08; Y; Y10; Y10S; Y10S521/00; Y10S521/908
Claims Analysis
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |