Patent US4232143A successfully refreshed from Google Patents.
US4232143A
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Polyester which exhibits anisotropy in the melt containing p-oxybenzoyl units and 4,4'-dioxybenzophenone units or methyl and chloro derivatives thereof
Assignee: EIDP Inc
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Filing: 1979-09-17
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Granted: 1980-11-04
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Expires: 1999-09-17
Abstract
Abstract An aromatic polyester consisting essentially of p-oxybenzoyl units or the 3-methyl or 3-chloro-derivatives thereof, 4,4'-dioxybenzophenone units or the 3-methyl- or 3-chloro- derivatives thereof, terephthaloyl units and optionally 1,4-dioxyphenylene units.
Inventors
- 👤 Robert S. Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:41
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
93 words
Fiber-forming copolyesters consisting essentially of units I, II, III and IV having the structural formulas: ##STR2## where X and R are independently hydrogen, methyl- or chloro-, with the proviso that when X is methyl-, R is hydrogen or methyl-, and when X is chloro-, R is hydrogen or chloro-, in the proportions of about 54-70 mol % of Unit I, about 10-16 mol % of Unit II, from 0 to about 8 mol % of Unit III and an amount of Unit IV equivalent on a molar basis to Units II and III.
Claim 2
Dependent Claim
93 words
Fiber-forming copolyesters consisting essentially of units I, II, III and IV having the structural formulas: ##STR2## where X and R are independently hydrogen, methyl- or chloro-, with the proviso that when X is methyl-, R is hydrogen or methyl-, and when X is chloro-, R is hydrogen or chloro-, in the proportions of about 54-70 mol % of Unit I, about 10-16 mol % of Unit II, from 0 to about 8 mol % of Unit III and an amount of Unit IV equivalent on a molar basis to Units II and III.
Claim 3
Dependent Claim
8 words
A filament of a copolyester of claim 1.
Claim 4
Dependent Claim
20 words
A fiber-forming copolyester according to claim 1 wherein Unit I is present in an amount of about 60 mol %.
Claim 5
Dependent Claim
8 words
A filament of a copolyester of claim 3.
Claim 6
Dependent Claim
15 words
A fiber-forming copolyester according to claim 1 wherein X is hydrogen and R is methyl.
Claim 7
Dependent Claim
15 words
A fiber-forming copolyester according to claim 1 wherein X is hydrogen and R is hydrogen.
Claim 8
Dependent Claim
15 words
A fiber-forming copolyester according to claim 1 wherein X is methyl and R is hydrogen.
Claim 9
Dependent Claim
8 words
A filament of the copolyester of claim 5.
Claim 10
Dependent Claim
8 words
A filament of the copolyester of claim 6.
Claim 11
Dependent Claim
15 words
A fiber-forming copolyester according to claim 1 wherein X is hydrogen and R is chloro.
Claim 12
Dependent Claim
15 words
A fiber-forming copolyester according to claim 1 wherein X is methyl and R is methyl.
Claim 13
Dependent Claim
15 words
A fiber-forming copolyester according to claim 1 wherein X is chloro and R is chloro.
Claim 14
Dependent Claim
8 words
A filament of the copolyester of claim 10.
Claim 15
Dependent Claim
8 words
A filament of the copolyester of claim 11.
Claim 16
Dependent Claim
8 words
A filament of the copolyester of claim 12.
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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |