US3634324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers prepared from phenols romatic diamines and aromatic dianhydrides
Assignee: Rhone Poulenc SA
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Filing: 1969-07-02
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Granted: 1972-01-11
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Expires: 1989-07-02
Abstract
Abstract NEW HEAT-STABLE RESINS ARE PREPARED BY CURING PREPOLYMERS OF A PHENOL AN AROMATIC DI-PRIMARY DIAMINE AND A DIANHYDRIDE OF AZOBENZENETETRACARBOXYLIC OR AZOXYTETRACARBOXYLIC ACID, SAID POLYMERS BEING USEFUL IN A PRODUCTION OF HOMOGENEOUS OR COMPOSITE MOULDED OBJECTS.
Inventors
- 👤 Maurice Ducloux
- 👤 Max Gruffaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:12
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1096
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |