US3758434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic polyimides with increased solubility
Assignee: Bayer AG
•
Filing: 1971-02-25
•
Granted: 1973-09-11
•
Expires: 1991-02-25
Abstract
Abstract NEW HIGH MOLECULAR WEIGHT AROMATIC POLYIMIDES WHICH ARE SOLUBLE IN POLAR ORGANIC SOLVENTS. OBTAINED BY REACTION OF A TETRACARBOXYLIC ACID DIANHYDRIDE WITH AT LEAST ONE DIAMINE OF THE GENERAL FORMULA 1,2-(-Y-X-C(-AR2-O-AR3-NH2)(-AR1-O-AR3-NH2)-),R1,R2- BENZENE THE POLYIMIDES ARE USEFUL FOR THE PRODUCTION OF FILMS, FOILS, FIBERS, COATINGS AND MOULDED PRODUCTS.
Inventors
- 👤 H Kunzel
- 👤 F Bentz
- 👤 G Nischk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:51
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1071
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |