US3661852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide-imide compositions with improved hydrolytic stability
Assignee: General Electric Co
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Filing: 1970-05-11
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Granted: 1972-05-09
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Expires: 1990-05-11
Abstract
Abstract THIS INVENTION RELATES TO NEW POLYAMIDE-IMIDE COMPOSITIONS HAVING IMPROVED HYDROLYTIC STABILITY AND FORMED BY REACTING MALEIC ANHYDRIDE WITH THE PRODUCT OBTAINED BY REACTING A DIANHYDRIDE WITH AN INTERMEDIATE DIAMINE FORMED BY REACTION OF TRIMELLITIC ANHYDRIDE, HEXAMETHYLENE DIAMINE AND AN AROMATIC DIAMINE. THE RESULTING COMPOSITIONS IS USEFUL FOE ELECTRICAL INSULATING PURPOSES IN THE FORM OF FILMS OR COATINGS.
Inventors
- 👤 Ralph G Flowers
- 👤 Thomas L Sherer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:54
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; C08G73/12
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |