US4743504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester yarns produced by high speed melt-spinning processes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1983-09-14
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Granted: 1988-05-10
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Expires: 2003-09-14
Abstract
Abstract A spun polyester yarn containing ethylene terephthalate as the main or only recurring unit characterized by a percentage crystallinity ( beta x102) of less than 20, a birefringence ( DELTA n) of at least 50x10-3, a function A greater than 28 and a function B>/=16 where <IMAGE> and B=(A-100 beta ) and wherein-IV is the intrinsic viscosity of the spun yarn, DELTA n is the birefringence of the spun yarn and (dpf) is the filament decitex of the spun yarn.
Inventors
- 👤 Paul L. I. Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:40
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01D; D01D5/00; D01D5/08; D01D5/084; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
A spun polyester yarn containing ethylene terephthalate as the main or only recurring unit having a percentage crystallinity (β× 10 2 ) of less than 20, a birefringence (Δn) of at least 50×10 -3 , a function A greater than 28 and a function B≧16 where ##EQU9## and B=(A-100β) and wherein IV is the intrinsic viscosity of the spun yarn, Δn is the birefringence of the spun yarn and (dpf) is the filament decitex of the spun yarn.
Claim 2
Dependent Claim
78 words
A spun polyester yarn containing ethylene terephthalate as the main or only recurring unit having a percentage crystallinity (β× 10 2 ) of less than 20, a birefringence (Δn) of at least 50×10 -3 , a function A greater than 28 and a function B≧16 where ##EQU9## and B=(A-100β) and wherein IV is the intrinsic viscosity of the spun yarn, Δn is the birefringence of the spun yarn and (dpf) is the filament decitex of the spun yarn.
Claim 3
Dependent Claim
21 words
A spun polyester yarn as claimed in claim 1 further having a birefringence of between 50×10 -3 and 100×10 -3 .
Claim 4
Dependent Claim
21 words
A spun polyester yarn as claimed in claim 2 further having a birefringence of between 60×10 -3 and 100×10 -3 .
Claim 5
Dependent Claim
18 words
A spun polyester yarn as claimed in claim 1 having an intrinsic viscosity of between 0.55 and 0.70.
Claim 6
Dependent Claim
18 words
A spun polyester yarn as claimed in claim 1 having an amorphous orientation greater than 15×10 -2 .
Claim 7
Dependent Claim
18 words
A spun polyester yarn as claimed in claim 5 having an amorphous orientation greater than 20×10 -2 .
References Cited (Backward Citations)
US3771307A
Cited
US3772872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |