Patent US3812082A successfully refreshed from Google Patents.
US3812082A
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US
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Compliant polyimides
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1972-12-18
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Granted: 1974-05-21
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Expires: 1992-12-18
Abstract
Abstract A COMPLIANT POLYIMIDE HAVING SUPERIOR THERMO-MECHANICAL PROPERTIES CAN BE PRODUCED BY REACTING AMINE OR ISOCYANATE TERMINED POLYALIPHATIC ETHERS WITH AN AROMATIC TETRACARBOXYLIC ACID OR DIANHYDRIDE. THESE POLYIMIDES DISPLAY A LONG TERM THERMO-OXIDATIVE STABILITY AND A HIGH PERCENT ELONGATION TO BRACK, AND THEY ARE SUITABLE FOR USE AS FILMS, FIBERS, COATINGS, ADHESIVES, STRUCTURES, AND SEALANTS.
Inventors
- 👤 R Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:58
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/105; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G18/343; C08G18/346; C08G18/70; C08G18/72; C08G18/77; C08G18/771; C08G18/773; C08G73/1003; C08G73/1035; C08G73/1042; C08G73/1057; C08G73/1064
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |