US3637901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin composition containing a prepolymer of an n n'-bis-imide and a diamine
Assignee: Rhone Poulenc SA
•
Filing: 1970-05-28
•
Granted: 1972-01-25
•
Expires: 1990-05-28
Abstract
Abstract CURED EPOXY RESINS OF GOOD HEAT RESISTANCE ARE MADE BY HEATING AN EPOXY RESIN WITH A PREPOLYMER MELTING BELOW 200*C. MADE FROM AN N,N''-BIS-IMIDE, E.G. N,N''4,4''-DIPHENYLMETHANE-BIS-MALEIMIDE, AND A DIAMINE.
Inventors
- 👤 Michel Bargain
- 👤 Max Gruffaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:14
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; C08L79/085; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4042; C08L63/00; Y; Y10; Y10S; Y10S525/00; Y10S525/929
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |