US3748304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amide-imide copolymers
Assignee: Standard Oil Co
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Filing: 1972-03-28
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Granted: 1973-07-24
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Expires: 1992-03-28
Abstract
Abstract NOVEL COPOLYMERS OF THE AMIDE-IMIDE TYPE ARE MADE FROM APPROXIMATELY EQUIMOLAR AMOUNT OF A MIXTURE OF TWO OR MORE LARGELY- OR WHOLLY-AROMATIC PRIMARY IDAMINES AND AN AROMATIC POLYCARBOXYLIC-ACID-ANHYDRIDE DERIVATIVE. THESE NOVEL COPOLYMERS ARE USEFUL FOR PREPARING ENAMELS, FILMS AND MOLDED ARTICLES OF SUPERIOR PROPERTIES.
Inventors
- 👤 J Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:02
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/14
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |