US3705869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soluble polyimides
Assignee: Novartis Corp
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Filing: 1971-11-30
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Granted: 1972-12-12
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Expires: 1991-11-30
Abstract
Abstract POLYIMIDES ARE PREPARED BY REACTING AN AROMATIC TETRACARBOXYLIC ACID DIANTHYDRIDE WITH A DIAMINE HAVING THE FORMULA 1,2-(-C(-1,4-PHENYLENE-NH2)2-CO-R1-)BENZENE WHEREIN R2 IS N-H, N-LOWER ALKYL, N-ARYL. THESE POLYIMIDES ARE SOLUBLE IN CERTAIN ORGANIC SOLVENTS WHEREBY THEY CAN BE FABRICATED INTO FILMS, COATINGS, LAMINATES, AND THE LIKE. THE POLYIMIDES ARE ALSO FUSIBLE AND MOLDINGS THUS OBTAINED ARE LOW IN VOID CONTENT.
Inventors
- 👤 Franklin P Darmory
- 👤 Marianne Di Benedetto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:18
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/16; C08G73/1046; C08G73/1053; C08G73/1057; C08G73/106; C08G73/1064; C08G73/1085; C08G73/14
Claims Analysis
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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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |