US3637592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline copolyketone film structures
Assignee: EIDP Inc
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Filing: 1970-06-10
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Granted: 1972-01-25
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Expires: 1990-06-10
Abstract
Abstract CRYSTALLINE COPOLYKETONE FILM STRUCTURES HAVING THE FOLLOWING REPEATING STRUCTURAL UNIT -(1,4-PHENYLENE-O-1,4-PHENYLENE-CO-1,3(OR4)-PHENYLENE-CO)- WHEREIN THE 1,3(OR4)-PHENYLENE MOIETY IS EITHER 1,4-PHENYLENE (T MOIETY) OR 1,3-PHENYLENE (I MOIETY), AND THE T:1 RATIO VARIES FROM 90:10 TO 50:50 ARE PROVIDED; CRYSTALLIZED FILM STRUCTURES ARE USEDFUL IN A VARIETY OF APPLICATIONS, FOR EXAMPLE, ELECTRICAL INSULATION.
Inventors
- 👤 Charles E Berr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:38
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/12; C08G61/127
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |