US3726831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyimides from amino aromatic dicarboxylic acids and ester derivatives of said acids
Assignee: I M L Corp A CORP OF DE
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Filing: 1970-11-10
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Granted: 1973-04-10
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Expires: 1990-11-10
Abstract
Abstract MONOMERIC AROMATIC COMPOUNDS HAVING TWO CARBOXYLIC GROUPS AND AN AMINO GROUP SO SITUATED AS TO ALLOW THE MONOMER TO BE CONDENSED TO A POLYAMIC ACID OR A DERIVATIVE THEREOF WITH SUBSEQUENT CYCLIZATION TO A POLYIMIDE, TOGETHER WITH THE INTERMEDIATE AND END PRODUCTS. THE PREPARATION OF THE MONOMERS AND PROCESSES OF PREPARING POLYAMIC ACIDS AND POLYIMIDES THEREFROM.
Inventors
- 👤 L Acle
- 👤 W Boram
- 👤 J Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:27
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1085; C08G73/1003; C08G73/1067
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |