US4499259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically anisotropic melt forming copolyesters
Assignee: EIDP Inc
•
Filing: 1983-12-16
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Granted: 1985-02-12
•
Expires: 2003-12-16
Abstract
Abstract Copolyesters useful for fibers from hydroquinone, hydroxybenzoic acid or 6-hydroxy-2-naphthoic acid, 3,4'-dicarboxydiphenyl ether and optionally isophthalic acid or resorcinol.
Inventors
- 👤 Robert S. Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:22
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; D; D01; D01F; D01F6/00; D01F6/78; D01F6/84
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
Fiber-forming, melt spinnable copolyesters consisting essentially of Units having the structural formulas: ##STR3## where X and Y are the same and are selected from --O-- or ##STR4## said Units being present in the proportions of from about 10 to 60 mol % of Unit I, from about 15 to 45 mol % of Unit II, and from about 15 to 45 mol % of Unit III.
Claim 2
Dependent Claim
66 words
Fiber-forming, melt spinnable copolyesters consisting essentially of Units having the structural formulas: ##STR3## where X and Y are the same and are selected from --O-- or ##STR4## said Units being present in the proportions of from about 10 to 60 mol % of Unit I, from about 15 to 45 mol % of Unit II, and from about 15 to 45 mol % of Unit III.
Claim 3
Dependent Claim
11 words
A copolyester according to claim 1 wherein Unit I is ##STR5##
Claim 4
Dependent Claim
8 words
A fiber of the copolyester of claim 1.
Claim 5
Dependent Claim
8 words
A film of the copolyester of claim 1.
Claim 6
Dependent Claim
11 words
A molded or extruded article of the copolyester of claim 1.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |