US4500699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically anisotropic melt forming copolyesters
Assignee: EIDP Inc
•
Filing: 1984-06-26
•
Granted: 1985-02-19
•
Expires: 2004-06-26
Abstract
Abstract Copolyesters useful for fibers from certain monosubstituted hydroquinones, terephthalic acid and certain substituted benzophenones.
Inventors
- 👤 Robert S. Irwin
- 👤 Francis M. Logullo, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:40
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
A copolyester consisting essentially of Units I, II and III, said units having the structural formulas: ##STR2## where X is chloro, bromo, methyl, ethyl or phenyl, and Y is chloro or methyl with the proviso that Y substituents are not in both 2' and 6' positions; in the proportions of from about 30 to 50 mol % of Unit I, from about 30 to 50 mol % of Unit II and from about 10 to 20 mol % of Unit III.
Claim 2
Dependent Claim
81 words
A copolyester consisting essentially of Units I, II and III, said units having the structural formulas: ##STR2## where X is chloro, bromo, methyl, ethyl or phenyl, and Y is chloro or methyl with the proviso that Y substituents are not in both 2' and 6' positions; in the proportions of from about 30 to 50 mol % of Unit I, from about 30 to 50 mol % of Unit II and from about 10 to 20 mol % of Unit III.
Claim 3
Dependent Claim
10 words
A copolyester according to claim 1 where X is chloro.
Claim 4
Dependent Claim
11 words
A copolyester according to claim 1 wherein Unit III is ##STR3##
Claim 5
Dependent Claim
11 words
A copolyester according to claim 1 wherein Unit III is ##STR4##
Claim 6
Dependent Claim
11 words
A copolyester according to claim 1 wherein Unit III is ##STR5##
Claim 7
Dependent Claim
8 words
A fiber of the copolyester of claim 1.
Claim 8
Dependent Claim
8 words
A film of the copolyester of claim 1.
Claim 9
Dependent Claim
11 words
A molded or extruded article of the copolyester of claim 1.
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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) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |