US3753998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for producing polyamide-imide and polyamide polymers
Assignee: Standard Oil Co
•
Filing: 1972-04-24
•
Granted: 1973-08-21
•
Expires: 1992-04-24
Abstract
Abstract A POLYAMIDE-IMIDE OR POLYAMIDE PREPARED BY HEATING IN A SOLVENT THE FOLLOWING THREE REACTANTS: (1) TRIMELLITIC ANHYDRIDE, OR ISOPHTHALIC ACID, OR MIXTURES THEREOF, (2) AROMATIC DIAMINES AND (3) LACTAMS OR AMINO ACIDS WHEREIN THE MOLAR RATIO OF THE TRIMELLITIC ANHYDRIDE OR ISOPHTHALIC ACID TO THE AROMATIC DIAMINE TO THE LACTAMS IS ABOUT 1:1:0.3 TO ABOUT 1:1:2.5. A PROCESS FOR PREPARING THESE POLYAMIDE-IMIDES IS ALSO DISCLOSED. THESE POLYAMIDEIMIDES ARE USEFUL AS INSULATING COATINGS FOR ELECTRICAL WIRE AND IN MOLDED ARTICLES.
Inventors
- 👤 E Morello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:35
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; C; C08; C08G; C08G69/00; C08G69/02; C08G69/36; C08G73/00; C08G73/06; C08G73/10; C08G73/14; H01B3/307
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |