US3778411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide acids and polyamideimides
Assignee: General Electric Co
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Filing: 1971-07-30
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Granted: 1973-12-11
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Expires: 1991-07-30
Abstract
Abstract NEW AND USEFUL POLYAMIDEIMIDES AND THEIR PRECURSOR POLYAMIC ACIDS ARE PROVIDED. THE POLYAMIC ACID IS PREPARED BY REACTING DIACID WITH POLYAMINE MATERIAL INCLUDING POLYMETHYLENE POLYANILINE AND FURTHER REACTING THIS REACTION PRODUCT WITH ORGANIC DIANHYDRIDE AND ALIPHATICALLY UNSATURATED ORGANIC ANHYDRIDE. THE POLYAMIC ACID IS CURED TO PROVIDE THE FINAL POLYAMIDEIMIDE.
Inventors
- 👤 C Emerick
- 👤 D Pauze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:45
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/31504; Y10T428/31678; Y10T428/31681
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |