US4338275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of polyester yarns
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1980-07-24
•
Granted: 1982-07-06
•
Expires: 2000-07-24
Abstract
Abstract Manufacture of polyester yarns by a high speed draw spinning process in which the yarns are passed through defined fluid environments. Yarns are comparable in properties with conventional spin-lag-draw hot relax yarns.
Inventors
- 👤 Paul L. I. Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:08
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01D; D01D5/00; D01D5/08; D01D5/098
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A draw spinning process for the manufacture of polyester filaments comprising directly extruding molten polyester filaments into a first fluid environment heated to a temperature above the melting point of the filaments and subsequently passing said filaments through a second fluid environment heated to a temperature above the glass transition temperature but below the melting temperature of the filaments, said fluid environments being separate from one another a distance sufficient to cool the filaments below the temperature of the second fluid environment, and withdrawing and winding up the filaments at a speed in excess of 5500 meters/minute.
Claim 2
Dependent Claim
97 words
A draw spinning process for the manufacture of polyester filaments comprising directly extruding molten polyester filaments into a first fluid environment heated to a temperature above the melting point of the filaments and subsequently passing said filaments through a second fluid environment heated to a temperature above the glass transition temperature but below the melting temperature of the filaments, said fluid environments being separate from one another a distance sufficient to cool the filaments below the temperature of the second fluid environment, and withdrawing and winding up the filaments at a speed in excess of 5500 meters/minute.
Claim 3
Dependent Claim
20 words
A process according to claim 1 in which the fluid environments are separated by between 100 cm and 500 cm.
Claim 4
Dependent Claim
13 words
A process according to claim 1 in which the fluid environment is air.
Claim 5
Dependent Claim
21 words
A process according to claim 1 in which the filaments are wound up at a speed in excess of 6000 meters/minute.
Claim 6
Dependent Claim
19 words
A process according to claim 1 in which the filaments are cooled between the first and second fluid environments.
References Cited (Backward Citations)
CA763339A
Cited
US3053611A
Cited
US3361859A
Cited
JPS481421U
Cited
US3969462A
Cited
US3946100A
Cited
US4255377A
Cited
US4134882A
Cited
US4156071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-05 | 1986-01-04 | 1986-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-05 | 1990-01-04 | 1990-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-05 | 1994-01-04 | 1994-07-06 | $7700.00 | Window Closed / Lapsed |