Patent US3316213A successfully refreshed from Google Patents.
US3316213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing aromatic polyamides and polyoxazoles
Assignee: EIDP Inc
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Filing: 1963-12-16
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Granted: 1967-04-25
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Expires: 1983-12-16
Abstract
No abstract record available.
Inventors
- 👤 Charles E Berr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:31
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
IN A PROCESS FOR PREPARING A POLYBENZOXAZOLE WHEREIN AT LEAST ONE DIAMINE HAVING THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
16 words
IN A PROCESS FOR PREPARING A POLYBENZOXAZOLE WHEREIN AT LEAST ONE DIAMINE HAVING THE STRUCTURAL FORMULA
References Cited (Backward Citations)
US3094511A
Cited
US3230196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-04-24 | 1970-10-24 | 1971-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-24 | 1974-10-24 | 1975-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-24 | 1978-10-24 | 1979-04-25 | $7700.00 | Window Closed / Lapsed |