Patent US3693341A successfully refreshed from Google Patents.
US3693341A
Expired / Lapsed
US
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Yarn treatment process
Assignee: Hercules LLC
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Filing: 1970-04-17
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Granted: 1972-09-26
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Expires: 1990-04-17
Abstract
Abstract Yarns prepared by a fluid jet bulking technique have been found to contain a large number of loops which interfere with processing when the yarns are tufted into carpets. These loops are removed by subjecting the yarn to a false untwisting operation while under a tension of at least about 0.02 gram per denier.
Inventors
- 👤 Wade L Higgins Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:51
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
A process for removing loops from a twisted, fluid jet-bulked ply yarn composed of continuous filaments of synthetic polymer which comprises applying to said yarn a false twist in a direction reverse to the ply Twist and in an amount substantially equal to that of the ply twist in said yarn to cause said yarn momentarily to assume a zero twist status while subjecting said yarn to a tension of at least about 0.02 gram per denier.
Claim 2
Dependent Claim
77 words
A process for removing loops from a twisted, fluid jet-bulked ply yarn composed of continuous filaments of synthetic polymer which comprises applying to said yarn a false twist in a direction reverse to the ply Twist and in an amount substantially equal to that of the ply twist in said yarn to cause said yarn momentarily to assume a zero twist status while subjecting said yarn to a tension of at least about 0.02 gram per denier.
Claim 3
Dependent Claim
11 words
The process of claim 1 in which the polymer is polypropylene.
References Cited (Backward Citations)
US3306023A
Cited
US2655781A
Cited
GB951088A
Cited
GB848037A
Cited
US3069838A
Cited
US3151438A
Cited
US3404525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |