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US4487916A
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Melt-spinnable copolyesters
Assignee: EIDP Inc
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Filing: 1983-12-16
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Granted: 1984-12-11
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Expires: 2003-12-16
Abstract
Abstract Copolyesters useful for fibers from hydroquinone, 3,4'-dicarboxydiphenyl ether and from 10 to 20 mole % of a member of the group consisting of terephthalic acid, 2,6-naphthalenedicarboxylic acid, 4,4'-bibenzoic acid, 2,6-naphthalenediol and 4,4'-dihydroxydiphenyl.
Inventors
- 👤 Robert S. Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:36
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
50 words
A copolyester consisting essentially of Units I, II and III, said units having the structural formulas: ##STR2## Where Units I and II are present in the amount of from about 30 to 50 mole % and Unit III is present in the amount of from 10 to 20 mole %.
Claim 2
Dependent Claim
50 words
A copolyester consisting essentially of Units I, II and III, said units having the structural formulas: ##STR2## Where Units I and II are present in the amount of from about 30 to 50 mole % and Unit III is present in the amount of from 10 to 20 mole %.
Claim 3
Dependent Claim
11 words
A copolyester according to claim 1 wherein Unit III is ##STR3##
Claim 4
Dependent Claim
11 words
A copolyester according to claim 1 wherein Unit III is ##STR4##
Claim 5
Dependent Claim
8 words
A fiber of the copolyester of claim 1.
Claim 6
Dependent Claim
8 words
A film of the copolyester of claim 1.
Claim 7
Dependent Claim
11 words
A molded or extruded article of the copolyester of claim 1.
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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |