Patent US3816992A successfully refreshed from Google Patents.
US3816992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crimped polyester filament yarn and process for making same
Assignee: EIDP Inc
•
Filing: 1973-04-23
•
Granted: 1974-06-18
•
Expires: 1993-04-23
Abstract
Abstract Polyester textile filaments which have asymmetric shrinkage properties, and may be heat-relaxed to provide a high crimp frequency and a narrow crimp frequency distribution, are produced by melt-spinning a single synthetic linear polyester composition, drawing the filaments and then passing them over an unheated nonmetallic pin at high speed. The process conditions are controlled to provide filaments of regular cross-sectional configuration having a modified minor portion, distinguishable from the remainder of the filament by a different refractive index, which extends substantially continuously along the filament.
Inventors
- 👤 Hans Rudolf Edward Frankfort
- 👤 Peter Francis Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:01
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/004; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
18 words
A textile filament as defined in claim 1 which has asymmetric shrinkage properties and develops crimp when heat-relaxed.
Claim 2
Dependent Claim
9 words
A multifilament yarn of filaments defined in claim 2.
Claim 3
Dependent Claim
46 words
A textile filament as defined in claim 1 having a range of normalized crimp frequency values, measured after a heat-relaxing treatment for 5 minutes in 180*C. air, which averages 25 to 60 crimps per filament inch with a percent coefficient of variation of less than 30.
Claim 4
Dependent Claim
35 words
A textile filament as defined in claim 4 having a range of normalized crimp frequency values which averages 30 to 60 crimps per filament inch with a percent coefficient of variation of less than 20.
Claim 5
Dependent Claim
18 words
A multifilament yarn of filaments defined in claim 4, the filament crimp being random for filament to filament.
Claim 6
Dependent Claim
47 words
A textile filament as defined in claim 4 wherein at least 95 percent of thE filament length has greater than 15 crimps per filament inch and the crimp frequency distribution for the middle 90 percent is numerically less than the average number of crimps per filament inch.
Claim 7
Dependent Claim
36 words
A textile filament as defined in claim 4 wherein the abraded surface is on the outside of crimp bends and is marked by closely spaced, parallel ripples which extend tranversely with respect to the filament length.
Claim 8
Dependent Claim
16 words
A textile filament as defined in claim 1 wherein the polyester consists essentially of polyethylene terephthalate.
Claim 9
Dependent Claim
14 words
A textile filament as defined in claim 1 which has a substantially round cross-section.
Claim 10
Dependent Claim
35 words
A textile filament as defined in claim 1 wherein said minor portion occupies from 3 percent to 20 percent of representative cross-sectional areas along the filament and is from 1 to 3 microns in thickness.
Claim 11
Dependent Claim
82 words
A textile filament as defined in claim 1 having a range of normalized crimp frequency values, measured after a heat-relaxing treatment for 5 minutes in 180*C. air, wherein at least 95 percent of the filament length has greater than 15 crimps per filament inch, at least 90 percent of the filament length as greater than 20 crimps per filament inch, and the crimp frequency distribution for the middle 90 percent is numerically less than the average number of crimps per filament inch.
Claim 12
Dependent Claim
117 words
A process for treating multifilament yarn to impart asymmetric shrinkage properties to drawn yarn filaments consisting of a single synthetic linear polyester composition which comprises passing the drawn filaments at high speed in frictional contact with an unheated nonmetallic pin for a contact distance (c) of 0.5 to 15 millimeters under a tension which applies a filament stretch (s) of 2 to 5 percent, said pin having a coefficient of friction (f) of 0.4 to 1.1 and said filaments having a temperature (t) of 25* to 150*C. just prior to contact with the pin, the values of said variables being such that (c) (s) (f)3 (t)4 . 10 7 is within the range from 7.5 to 35.
Claim 13
Dependent Claim
50 words
A process for treating the filaments of a multifilament yarn as defined in claim 13, wherein said yarn has been drawn to have an elongation of 20 to 40 percent and a boil-off shrinkage of 8 to 16 percent before the yarn filaments are passed in contact with said pin.
References Cited (Backward Citations)
US2974391A
Cited
US3226792A
Cited
US3358345A
Cited
US3115744A
Cited
US3379809A
Cited
US3317978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |