US3424718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of aromatic tetracarboxylic acids with at least two organic diamines
Assignee: EIDP Inc
•
Filing: 1964-09-23
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Granted: 1969-01-28
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Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Rudolph J Angelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:31
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1071; C08G73/1042; C08G73/1057; C08G73/106; C08G73/1064; C08G73/1085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3179614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |