US3740378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making polyimides from aliphatically unsaturated bis-imides
Assignee: General Electric Co
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Filing: 1970-03-27
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Granted: 1973-06-19
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Expires: 1990-03-27
Abstract
Abstract POLYIMIDES CAN BE MADE AT TEMPERATURES AS LOW AS 25*C. BY EFFECTING CONTACT BETWEEN AN ARYL POLYAMINE AND AN ALIPHATICALLY UNSATURATED BISMIDE, SUCH AS A BISMALEIMIDE, IN THE PRESENCE OF AN ACID CATALYST, SUCH AS AN ORGANIC CARBOXYLIC ACID. THE RESULTING POLYIMIDES CAN BE USED AS MOLDING COMPOUNDS, LAMINATES, WIRE COATINGS, AND IN APPLICATIONS REQUIRING THE SERVICES OF MATERIALS POSSESSING RESISTANCE TO CHANGE AT ELEVATED TEMPERATURES.
Inventors
- 👤 J Crivello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:19
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08G73/121
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |