Patent US3342897A successfully refreshed from Google Patents.
US3342897A
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Blends of the polypyromellitamide of bis(4-aminophenyl) ether and polypyromellitamide-acid of an aromatic diamine
Assignee: EIDP Inc
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Filing: 1964-12-09
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Granted: 1967-09-19
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Expires: 1984-12-09
Abstract
No abstract record available.
Inventors
- 👤 John G Abramo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:22
CPC Classifications
C; C08; C08L; C08L79/00; C08L79/04; C08L79/08; Y; Y10; Y10S; Y10S525/00; Y10S525/928
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
AN INTIMATE BLEND OF THE POLYPYROMELLITAMIDE-ACID OF BIS(4-AMINOPHENYL) ETHER AND THE POLYPYROMELLITAMIDEACID OF AN AROMATIC DIAMINE, THE LATTER SAID POLYPYROMELLITAMIDE-ACID CONSTITUTING FROM ABOUT 5 TO 35 MOLE PERCENT OF THE TOTAL AMOUNT OF POLYPYROMELLITAMIDE-ACIDS PRESENT, SAID AROMATIC DIAMINE HAVING THE FORMULA
Claim 2
Dependent Claim
41 words
AN INTIMATE BLEND OF THE POLYPYROMELLITAMIDE-ACID OF BIS(4-AMINOPHENYL) ETHER AND THE POLYPYROMELLITAMIDEACID OF AN AROMATIC DIAMINE, THE LATTER SAID POLYPYROMELLITAMIDE-ACID CONSTITUTING FROM ABOUT 5 TO 35 MOLE PERCENT OF THE TOTAL AMOUNT OF POLYPYROMELLITAMIDE-ACIDS PRESENT, SAID AROMATIC DIAMINE HAVING THE FORMULA
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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |