US3737478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making polyamide acid salts and products derived therefrom
Assignee: General Electric Co
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Filing: 1971-05-28
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Granted: 1973-06-05
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Expires: 1991-05-28
Abstract
Abstract A METHOD IS PROVIDED FOR CONVERTING A POLYIMIDE TO THE CORRESPONDING POLYAMIDE ACID SALT, UTILIZING A PREDETERMINED AMOUNT OF A STRONG BASE. THE POLYAMIDE ACID SALT CAN BE CONVERTED TO THE CORRESPONDING POLYAMIDE ACID. THE POLYAMIDE ACIDS AND POLYAMIDE ACID SALTS PROVIDED BY THE SUBJECT METHOD CAN BE CONVERTED TO THE POLYIMIDE STATE AFTER BEING APPLIED TO VARIOUS SUBSTRATES BY STANDARD DIP-COATING AND ELECTROCOATING TECHNIQUES. WHEN UTILIZED WITH A POTENTIOMERIC TITRATOR, THE METHOD OF THE INVENTION ALSO CAN BE USED TO DETERMINE IMIDE FUNCTIONALITY OF POLYIMIDE.
Inventors
- 👤 E Boldebuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:45
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4419; C09D5/4461; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |