Patent US4426420A successfully refreshed from Google Patents.
US4426420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spunlaced fabric containing elastic fibers
Assignee: EIDP Inc
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Filing: 1982-09-17
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Granted: 1984-01-17
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Expires: 2002-09-17
Abstract
Abstract Novel hydraulically entangled spunlaced fabrics and an improved process for making such fabrics composed of at least two types of staple fibers are provided. Elastomeric staple fibers which behave as ordinary staple fibers until heat treated are included in the hydraulically entangled fabric. Upon heat treatment, the elastomeric fibers become elastic and impart improved stretch and resilience properties to the fabric.
Inventors
- 👤 Kewal K. Likhyani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:50
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/492; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2905; Y10T442/00; Y10T442/60; Y10T442/601; Y10T442/602; Y10T442/681; Y10T442/689; Y10T442/697
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
In a process for making a spunlaced nonwoven fabric, wherein a batt composed of at least two types of staple fibers is subjected to hydraulic entanglement, the improvement comprising, for imparting greater stretch and resilience to the fabric, forming the batt of hard fibers and potentially elastic, elastomeric fibers and after the hydraulic entanglement treatment, heat-treating the resultant spunlaced fabric to develop elastic characteristics in the elastomeric fibers.
Claim 2
Dependent Claim
68 words
In a process for making a spunlaced nonwoven fabric, wherein a batt composed of at least two types of staple fibers is subjected to hydraulic entanglement, the improvement comprising, for imparting greater stretch and resilience to the fabric, forming the batt of hard fibers and potentially elastic, elastomeric fibers and after the hydraulic entanglement treatment, heat-treating the resultant spunlaced fabric to develop elastic characteristics in the elastomeric fibers.
Claim 3
Dependent Claim
19 words
A process of claim 1 wherein the elastomeric fibers comprise between 10 and 25% by weight of the batt.
Claim 4
Dependent Claim
18 words
A process of claim 1 wherein the elastomeric fibers are of a melt-spun and drawn poly(butylene terephthalate)-co-poly-(tetramethyleneoxy)terephthalate polymer.
Claim 5
Dependent Claim
27 words
A process of claim 3 wherein poly(butylene terephthalate) units amount to 15 to 60% and poly(tetramethyleneoxy)terephthalate units amount to 85 to 40% by weight of the polymer.
Claim 6
Dependent Claim
43 words
A process of claim 4 wherein the poly(butylene terephthalate) units amount to 45 to 55% by weight of the polymer and the poly(tetramethyleneoxy)terephthalate units are derived from a corresponding glycol having a number average molecular weight in the range of 1800 to 2200.
Claim 7
Dependent Claim
49 words
An improved spunlaced nonwoven fabric composed of a blend of at least two different types of staple fibers, wherein the improvement comprises the fabric containing no more than 40% and no less than 5% by weight elastomeric staple fibers that become elastic after being subjected to a heat treatment.
Claim 8
Dependent Claim
49 words
An improved spunlaced nonwoven fabric composed of a blend of at least two different types of staple fibers, wherein the improvement comprises the fabric containing no more than 40% and no less than 5% by weight elastomeric staple fibers that become elastic after being subjected to a heat treatment.
Claim 9
Dependent Claim
39 words
An improved spunlaced nonwoven fabric composed of a blend of at least two different types of staple fibers, the improvement comprising no more than 40% and no less than 5% by weight of elastomeric staple fibers that are elastic.
Claim 10
Dependent Claim
39 words
An improved spunlaced nonwoven fabric composed of a blend of at least two different types of staple fibers, the improvement comprising no more than 40% and no less than 5% by weight of elastomeric staple fibers that are elastic.
Claim 11
Dependent Claim
70 words
A spunlaced fabric of claim 6 or 7 wherein the elastomeric staple fibers are of poly(butylene terephthalate)-co-poly-(tetramethyleneoxy)terephthalate polymer in which the poly(butylene terephthalate) units amount to 45 to 55% and the poly(tetramethylene oxy)terephthalate units amount to 55 to 45 percent by weight of the polymer and the poly(tetramethylene oxy) terephthalate units are derived from a corresponding glycol having a number average molecular weight in the range of 1800 to 2200.
References Cited (Backward Citations)
US3007227A
Cited
US3493462A
Cited
US3494821A
Cited
US3485706A
Cited
GB1263822A
Cited
US3651014A
Cited
US3560326A
Cited
US3766146A
Cited
US3763109A
Cited
US4107364A
Cited
US4209563A
Cited
US4320166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |