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US3770686A
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Bis(3.4' - dicarboxyphenyl)sulfone dianhydride/metaphenylene diamine/oxydianiline polyimide precursor
Assignee: EIDP Inc
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Filing: 1971-06-01
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Granted: 1973-11-06
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Expires: 1991-06-01
Abstract
Abstract A COATING COMPOSITION OF A POLYAMIC ACID- PREPARED FROM BIS (3,4''-DICARBOXYPHENYL)SULFONE DIANHYDRIDE/METAPHENYLENE DIAMINE AND OPTIONALLY OXYDIANILINE OR METHYLENE DIANILINE IN BUTYROLACTONE OR SULFOLANE OR MIXTURES THEREOF WHICH MAY BE CURED TO A POLYAMIDE.
Inventors
- 👤 J Torelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/1064
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |