Patent US3832436A successfully refreshed from Google Patents.
US3832436A
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US
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Process for spinning high tenacity fibres
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-03-30
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Granted: 1974-08-27
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Expires: 1993-03-30
Abstract
Abstract Poly(ethylene-1:2-diphenoxyethane-4:4''-dicarboxylate) extruded to give spun yarn birefringence above 60 X 10 3 and not above value by equation Delta 18 X 10 6 W + 50 X 10 3 where Delta is spun yarn birefringence and W is wind up speed, followed by orientation by extension.
Inventors
- 👤 E Harris
- 👤 J Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:20
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/78; D01F6/84
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
A process for the manufacture of a yarn according to claim 1 wherein the spun yarn birefringence is in excess of 110 X 10 3 but does not exceed the value given by the equation: Delta (16.2 X 10 6) W + (50 X 10 3).
Claim 2
Dependent Claim
23 words
A process for the manufacture of a yarn according to claim 1 wherein said spun yarn is amorphous as judged by x-ray diffraction.
Claim 3
Dependent Claim
38 words
A process for the manufacture of a yarn according to claim 10 wherein the relative viscosity of the poly-(ethylene-1:2-diphenoxyethane-4:4''-dicarboxylate) or copolyester is up to 2.3 and the extrusion temperature is in the range from 295* to 335* C.
Claim 4
Dependent Claim
55 words
A process for the manufacture of a yarn according to claim 1 wherein cooling of the molten threadline is effected by contact with the ambient air at normal temperature and the relationship between spun yarn relative viscosity and extrusion temperature is according to the following formula: Extrusion temperature (89 X relative viscosity + 128)* C.
References Cited (Backward Citations)
US3361859A
Cited
GB1047978A
Cited
US3624031A
Cited
US3654225A
Cited
US3642697A
Cited
US3689623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |