US3763109A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Segmented thermoplastic copolyesters
Assignee: EIDP Inc
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Filing: 1971-08-19
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Granted: 1973-10-02
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Expires: 1991-08-19
Abstract
Abstract SEGMENTED THERMOPLASTIC COPOLYESTERS CONTAINING RECURRING LONG CHAIN ESTER UNITS DERIVED FROM DICARBOXYLIC ACIDS AND LONG CHAIN GLYCOLS AND SHORT CHAIN ESTER UNITS DERIVED FROM DICARBOXYLIC ACIDS AND LOW MOLECULAR WEIGHT DIOLS. AT LEAST 70% OF THE DICARBOXYLIC ACID USED IS TEREPHTHALIC ACID AND AT LEAST 70% OF THE LOW MOLECULAR WEIGHT DIOL IS 1,4-BUTANEDIOL. THE SHORT CHAIN ESTER UNITS CONSTITUTE ABOUT 66-95% BY WEIGHT OF THE POLYMER. SUCH COPOLYESTERS RAPIDLY HARDEN FROM THE MOLTEN STATE AND HAVE OUTSTANDING PHYSICAL PROPERTIES OVER A BROAD TEMPERATURE RANGE AND GOOD RESISTANCE TO SOLVENTS AND TO HEAT AGING.
Inventors
- 👤 W Witsiepe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:14
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/0005; C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |