Patent US3767626A successfully refreshed from Google Patents.
US3767626A
Expired / Lapsed
US
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Prepolymers and heat resistant resins derived thereof
Assignee: Rhone Poulenc SA
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Filing: 1969-12-17
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Granted: 1973-10-23
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Expires: 1989-12-17
Abstract
Abstract PREPOLYMERS USEFUL IN PREPARING MOULDED ARTICLES, ARE PRODUCED BY MIXING AND HEATING AN UNSATURATED N,N''-BISIMIDE, A DIPRIMARY DIAMINE, AND TRIMELLITIC ANHYDRIDE. COMPOSITIONS ARE PRODUCED BY MIXING THE PREPOLYMERS WITH ONE OR MORE FILLERS OR PIGMENTS.
Inventors
- 👤 S Laurent
- 👤 M Mallet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:23
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |