Patent US2445553A successfully refreshed from Google Patents.
US3601972A
Expired / Lapsed
US
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Drawing and bulking of synthetic filament yarns
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-06-23
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Granted: 1971-08-31
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Expires: 1989-06-23
Abstract
Abstract In a process for producing false twist crimped synthetic yarn from crimpless undrawn yarn comprising: partially drawing the crimpless undrawn yarn to less than full extent; imparting potential crimp by immediately and continuously imparting false twist to the partially-drawn yarn and heating the same under sufficient tension to complete the drawing; and releasing the tension.
Inventors
- 👤 Paul Rogers
- 👤 Roy Spencer Holliss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:03
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206; D02G1/0213; D02G1/022
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
A process according to claim 1 in which the synthetic filament yarn is a polyamide yarn.
Claim 2
Dependent Claim
16 words
A process according to claim 2 in which the synthetic filament yarn is poly(hexamthylene adipamide) yarn.
Claim 3
Dependent Claim
38 words
A process for developing bulk in a false twist crimped synthetic filament yarn made by a process according to claim 1 in which process the false twist crimped yarn is heat treated under a controlled tension and temperature.
Claim 4
Dependent Claim
35 words
A process according to claim 3 in which the ratio of the draw ratio in the false twist crimping stage to the draw ratio in the predrawing stage lies in the range 0.3 to 0.8.
Claim 5
Dependent Claim
28 words
A process as in claim 3 in which the draw ratio in the false twisting crimping stage at the draw ratio in the predrawing stage is above 1.3.
Claim 6
Dependent Claim
55 words
In a process for producing false twist crimped synthetic yarn from crimpless undrawn yarn comprising: partially drawing the crimpless undrawn yarn to less than full extent; imparting potential crimp by immediately and continuously imparting false twist to the partially-drawn yarn and heating the same under sufficient tension to complete the drawing; and releasing the tension.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |