US4808467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength hydroentangled nonwoven fabric
Assignee: Fitesa Simpsonville Inc
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Filing: 1987-09-15
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Granted: 1989-02-28
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Expires: 2007-09-15
Abstract
Abstract A strong, absorbent nonwoven fabric containing wood pulp and textile fibers is prepared by hydroentanglement with a continuous filament, base web. The fabric may be apertured or essentially nonapertured and may be made water repellant for use in medical and surgical applications.
Inventors
- 👤 Stuart P. Suskind
- 👤 Susan L. K. Martucci
- 👤 Joseph Israel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:27
CPC Classifications
D; D21; D21H; D21H27/00; D21H27/30; D21H27/32; D21H27/34; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/492; D04H1/498; D04H1/70; D04H1/72; D04H1/732; D04H3/00; D04H3/08; D04H3/14; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/66; Y10T442/663; Y10T442/664; Y10T442/668; Y10T442/689; Y10T442/697; Y10T442/698
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
48 words
A high strength nonwoven fabric comprising a continuous filament bonded base web and a wet laid second fibrous web consisting essentially of 50 to 90 weight percent wood pulp and 10 to 50 weight percent staple length fibers intimately hydroentangled with one another and with said base web.
Claim 2
Dependent Claim
48 words
A high strength nonwoven fabric comprising a continuous filament bonded base web and a wet laid second fibrous web consisting essentially of 50 to 90 weight percent wood pulp and 10 to 50 weight percent staple length fibers intimately hydroentangled with one another and with said base web.
Claim 3
Dependent Claim
32 words
A nonwoven fabric according to Claim 1 wherein the dry weight ratio of wet laid fibers to continuous filament base web fibers is in the range of about 3 to about 15.
Claim 4
Dependent Claim
32 words
A composite non-woven fabric according to Claim 1 wherein the dry weight ratio of wet laid fibers to continuous filament base web fibers is in the range of about 5 to 10.
Claim 5
Dependent Claim
18 words
A nonwoven fabric according to Claim 1 wherein the continuous filament of the base web is of polypropylene.
Claim 6
Dependent Claim
18 words
A nonwoven fabric according to Claim 1 wherein the continuous filament of the base web is of nylon.
Claim 7
Dependent Claim
18 words
A nonwoven fabric according to Claim 1 wherein the continuous filament of the base web is of polyester.
Claim 8
Dependent Claim
40 words
A composite nonwoven fabric according to Claim 1, wherein the continuous filament base web is a bonded web with a bonding area in the range of from about six to about twenty-five percent of the total area of the web.
Claim 9
Dependent Claim
32 words
A nonwoven fabric according to Claim 1 wherein the staple length fibers of the second web are selected from the group consisting of cotton, wool, rayon, polyamides, polyolefins, polyesters, and acrylic fibers.
Claim 10
Dependent Claim
36 words
A nonwoven fabric according to Claim 1 wherein the staple length fibers are in the range of 0.8 to 6 denier per filament and a length in the range of three eighths inch to two inches.
Claim 11
Dependent Claim
31 words
A nonwoven fabric according to Claim 1 wherein the basis weight of the continuous filament base web is in the range of from about 0.15 to 0.8 ounce per square yard.
Claim 12
Dependent Claim
24 words
A nonwoven according to claim 1 having a basis weight in the range of from about 0.8 to about 4 ounces per square yard.
Claim 13
Dependent Claim
19 words
A nonwoven fabric according to claim 1 having a fluorocarbon water repellant finish applied after hydroentanglement of the fibers.
Claim 14
Dependent Claim
61 words
A composite nonwoven fabric comprising 15 to 25 weight percent of a bonded continuous filament web, wherein the bonded area is within the range of 5 to 25 percent, and 75 to 85 weight percent mixed fibers consisting essentially of 50 to 90 weight percent softwood paermaking fibers and 10 to 50 weight percent staple length fibers hydroentangled with one another.
Claim 15
Dependent Claim
61 words
A composite nonwoven fabric comprising 15 to 25 weight percent of a bonded continuous filament web, wherein the bonded area is within the range of 5 to 25 percent, and 75 to 85 weight percent mixed fibers consisting essentially of 50 to 90 weight percent softwood paermaking fibers and 10 to 50 weight percent staple length fibers hydroentangled with one another.
Claim 16
Independent Claim
90 words
A method of making a nonwoven fabric comprising cellulosic papermaking fibers, wood pulp and staple length fibers reinforced with a web of continuous filament fibers which comprises laminating a plurality of water laid webs containing 45 to 90 weight percent wood pulp and 55 to 10 weight percent staple length synthetic fibers basis the dry weight of the fibers, with a continuous filament synthetic fiber web, subjecting the resulting multi-layer web to hydroentanglement forming a composite web of entangled fibers, and drying said composite web to form said nonwoven fabric.
Claim 17
Independent Claim
90 words
A method of making a nonwoven fabric comprising cellulosic papermaking fibers, wood pulp and staple length fibers reinforced with a web of continuous filament fibers which comprises laminating a plurality of water laid webs containing 45 to 90 weight percent wood pulp and 55 to 10 weight percent staple length synthetic fibers basis the dry weight of the fibers, with a continuous filament synthetic fiber web, subjecting the resulting multi-layer web to hydroentanglement forming a composite web of entangled fibers, and drying said composite web to form said nonwoven fabric.
References Cited (Backward Citations)
US4144370A
Cited
US4612237A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |