Patent FR2220442A1 successfully refreshed from Google Patents.
US3766146A
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US
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Segmented thermoplastic copolyester elastomers
Assignee: EIDP Inc
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Filing: 1971-03-18
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Granted: 1973-10-16
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Expires: 1991-03-18
Abstract
Abstract SEGMENTED THERMOPLASTIC COPOLYESTER ELASTOMERS CONTAINING RECURRING POLYMERIC LONG CHAIN ESTER UNITS DERIVED FROM DICARBOXYLIC ACIDS AND LONG CHAIN GLYCOLS AND SHORE CHAIN ESTER UNITS DERIVED FROM DICARBOXYLIC ACIDS AND LOW MOLECULAR WEIGHT DIOLS. AT LEAST 80% OF THE DICARBOXYLIC ACID USED IS TEREPHTHALIC ACID AND AT LEAST 80% OF THE LOW MOLECULAR WEIGHT DIOL IS 1,4-BUTANEDIOL. THE SHORT CHAIN ESTER UNITS CONSTITUTE ABOUT 48-65% BY WEIGHT OF THE POLYMER. SUCH COPOLYESTERS RAPIDLY HARDEN FROM THE MOLTEN STATE AND HAVE OUTSTANDING PHYSICAL PORPERTIES, ESPECIALLY TEAR STRENGTH, EABRASION RESISTANCE AND FLEX LIFE.
Inventors
- 👤 W Witsiepe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:20
CPC Classifications
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |