US3663653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polytetrahydrofuran modified block copolyester thermoplastic molding compositions
Assignee: Hoechst AG
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Filing: 1969-07-02
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Granted: 1972-05-16
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Expires: 1989-07-02
Abstract
Abstract MODIFIED POLYESTERS FROM AROMATIC DICARBOXYLIC ACIDS AND ALIPHATIC AND/OR CYCLOALIPHATIC DIOLS, WHICH CONTAIN FROM 0.5 TO 15 PERCENT BY WEIGHT OF POLYTETRAHYDROFURAN BLOCKS OBTAINED FROM A POLYTETRAHYDROFURANDIOL HAVING A MOLECULAR WEIGHT OF FROM 300 TO 5000 (HYDROXYL NUMBER 375 TO 22) AS STRUCTURAL UNTIS. THESE MODIFIED POLYESTERS ARE DISTINGUISHED BY A HIGH CRYSTALLIZATION SPEED AND CAN BE WORKED UP IN THE THERMOPLASTIC RANGE TO YIELD DIMENSIONALLY STABLE SHAPED ARTICLES.
Inventors
- 👤 Helmut Frohlich
- 👤 Ludwig Brinkman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:18
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08L; C08L67/00; C08L67/02
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |