Patent US3712933A successfully refreshed from Google Patents.
US3712933A
Expired / Lapsed
US
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Polyimide compositions
Assignee: Rhone Poulenc SA
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Filing: 1971-08-24
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Granted: 1973-01-23
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Expires: 1991-08-24
Abstract
Abstract A THERMOSETTING COMPOSITION HAVING REMARKABLE HEAT RESISTANCE WHICH COMPRISES (A) AN IMIDE PREPOLYMER OBTAINED BY REACTING AN N,N''-BIS-IMIDE OF AN UNSATURATED DICARBOXYLIC ACID OF GENERAL FORMULA: (-CO-D-CO-)>N-A-N<(-CO-D-CO-) IN WHICH D REPRESENTS A DIVALENT ORGANIC RADICAL CONTAINING A CARBON-CARBON DOUBLE BOND AND A IS A DIVALENT ORGANIC RADICAL POSSESSING AT LEAST TWO CARBON ATOMS, WITH A POLYAMINE OF GENERAL FORMULA: R(NH2)X IN WHICH R REPRESENTS AN ORGAIC RADICAL OF VALENCY X AND X IS AN INTERGER AT LEAST EQUAL TO 2, 0.55 TO 25 MOLS OF BIS-IMIIDE BEING USED PER MOLAR -NH2 GROUP OF THE POLYAMINE, AND (B) AN UNSATURATED POLYESTER.
Inventors
- 👤 M Docloux
- 👤 M Gruffaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:45
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08G63/553; C08L; C08L67/00; C08L67/06; C08L79/00; C08L79/04; C08L79/08; C08L79/085
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |