US3748338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soluble polyimides from aromatic dianhydrides and 10,10-di-(p-aminophenyl)thioxanthene
Assignee: Novartis Corp
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Filing: 1972-05-01
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Granted: 1973-07-24
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Expires: 1992-05-01
Abstract
Abstract POLYIMIDES ARE PREPARED BY REACTING AN AROMATIC TETRACARBOXYLIC ACID DIANHYDRIDE WITH 9,9-DI-(P-AMINOPHENYL)THIOXANTHENE. 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
- 👤 F Darmory
- 👤 Benedetto M Di
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:52
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1085; C08G73/1057; C08G73/1064
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |