US4338276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of polyamide yarns
Assignee: EIDP Inc
•
Filing: 1980-07-24
•
Granted: 1982-07-06
•
Expires: 2000-07-24
Abstract
Abstract Manufacture of polyamide 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 yarns.
Inventors
- 👤 Paul L. I. Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:40
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08; D01D5/098
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A draw spinning process for the manufacture of filamentary polyamide yarns comprising directly extruding molten polyamide 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 of 80° C. to 250° C., said fluid environment being separated from one another a distance sufficient to cool the filaments below the temperature of the second fluid environment, and withdrawing and winding up said filaments at a speed in excess of 5500 meters/minute.
Claim 2
Dependent Claim
91 words
A draw spinning process for the manufacture of filamentary polyamide yarns comprising directly extruding molten polyamide 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 of 80° C. to 250° C., said fluid environment being separated from one another a distance sufficient to cool the filaments below the temperature of the second fluid environment, and withdrawing and winding up said 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
27 words
A process according to claim 1 in which the first fluid environment is heated to a temperature between the melting point of the filaments and 350° C.
Claim 5
Dependent Claim
23 words
A process according to claim 1 in which the second fluid environment is heated to a temperature of 100° C. to 150° C.
Claim 6
Dependent Claim
13 words
A process according to claim 1 in which the fluid environment is air.
Claim 7
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.
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Cited
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Cited
US4134882A
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 |