US3414543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterocyclic polymers prepared from the reaction of tetracarboxylic acid dianhydrides and tetramines
Assignee: EIDP Inc
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Filing: 1967-05-19
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Granted: 1968-12-03
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Expires: 1987-05-19
Abstract
No abstract record available.
Inventors
- 👤 Paufler Robert Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:27
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/20; D; D01; D01F; D01F6/00; D01F6/58; D01F6/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |