US5540979A
Expired / Lapsed
US
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Porous non-woven bovine blood-oxalate absorbent structure
Assignee: Kimberly Clark Worldwide Inc
•
Filing: 1994-05-16
•
Granted: 1996-07-30
•
Expires: 2014-05-16
Abstract
Abstract There is disclosed a porous non-woven absorbent structure formed from fibers. The porous structure has a basis weight within the range of at least about 0.25 osy to about 10.0 osy a density of at least about 0.01 g/cc to about 0.15 g/cc. The porous structure is adapted such that upon the application of at least 2 ml of fluid Bovine blood-oxalate to a surface thereof, substantially all of said fluid enters the bulk of the porous structure within about 45 seconds. The porous structure may be single layered or include multiple layers. The single layered structure is formed from spunbonded thermoplastic fibers which include a hydrophilic internal additive. The multiple layered structure is formed by laminating a spunbonded web to a second layer. The second may be formed from natural or synthetic fibers. When formed from synthetic fibers, the second layer is generally formed from meltblown fibers which may also include a hydrophobic internal additive. The fibers forming either the spunbond or the meltblown layers may be mono-component or bi-component. In some applications, a liquid impervious film may be secured to a surface of the second layer.
Inventors
- 👤 Ali Yahiaoui
- 👤 David C. Potts
- 👤 Cheryl A. Perkins
- 👤 Michael D. Powers
- 👤 Jerald T. Jascomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:48
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/005; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; D04H1/00; D04H1/40; D04H1/54; D04H1/559; D04H1/56; D04H3/08; D04H3/14; B; B32; B32B; B32B2250/00; B32B2250/20; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2262/0261; B32B2262/0276; B32B2262/04; B32B2262/12; B32B2264/00; B32B2264/02; B32B2307/00; B32B2307/70; B32B2307/718; B32B2307/72; B32B2307/726; B32B2307/728; B32B2307/732; B32B2535/00; B32B2555/00; B32B27/00; B32B27/12; B32B3/00; B32B3/26; B32B3/266; B32B5/00; B32B5/02; B32B5/022; B32B5/08; B32B5/22; B32B5/24; B32B5/26; B32B7/00; B32B7/04; B32B7/06; B32B7/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249959; Y10T428/249962; Y10T428/249964; Y10T428/249976; Y10T428/249977; Y10T428/249981; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
79 words
A porous structure having: a density of at least about 0.01 g/cc; and a basis weight of from between about 0.5 osy to about 5 osy, wherein the porous structure is adapted to absorb at least 2 milliliters of fluid Bovine blood-oxalate in less than 45 seconds and upon the passage of about 5 minutes from the moment the Bovine blood-oxalate enters the undisturbed porous structure, greater than about 75% of said fluid is retained by the porous structure.
Claim 2
Dependent Claim
79 words
A porous structure having: a density of at least about 0.01 g/cc; and a basis weight of from between about 0.5 osy to about 5 osy, wherein the porous structure is adapted to absorb at least 2 milliliters of fluid Bovine blood-oxalate in less than 45 seconds and upon the passage of about 5 minutes from the moment the Bovine blood-oxalate enters the undisturbed porous structure, greater than about 75% of said fluid is retained by the porous structure.
Claim 3
Dependent Claim
14 words
The porous structure of claim 1, wherein the porous structure is formed from fibers.
Claim 4
Dependent Claim
17 words
The porous structure of claim 2, wherein the fibers comprise a thermoplastic material and a hydrophilic additive.
Claim 5
Dependent Claim
23 words
The porous structure of claim 3, wherein the thermoplastic material is selected from a group consisting of polypropylenes, polyethylenes, polyesters, rayons and polyamides.
Claim 6
Dependent Claim
16 words
The porous structure of claim 3, wherein at least some of the fibers are bi-component fibers.
Claim 7
Dependent Claim
17 words
The porous structure of claim 5, wherein the bi-component fibers comprise a homopolymer and a random co-polymer.
Claim 8
Dependent Claim
51 words
The porous structure of claim 5, wherein a first component of the bi-component fibers is polypropylene and a second component of the bi-component fibers is selected from the group consisting of linear low density polyethylene, high density polyethylene, a co-polymer of propylene and ethylene or a combination of polypropylene and polyethylene.
Claim 9
Dependent Claim
34 words
The porous structure of claim 3 wherein the hydrophilic additive is a hydrophilic internal additive selected from the group consisting of polyoxyalkylene modified fluorinated alkyls, polyoxyalkylene modified polydimethyl siloxanes and polyethylene glycol modified terephthalates.
Claim 10
Dependent Claim
20 words
The porous structure of claim 1 wherein the basis weight is from between about 1.0 osy to about 3 osy.
Claim 11
Dependent Claim
18 words
The porous structure of claim 1 wherein the basis weight is from between 0.7 osy to 1.0 osy.
Claim 12
Dependent Claim
38 words
The porous structure of claim 1 wherein upon the passage of about 5 minutes from the moment the Bovine blood-oxalate enters the undisturbed porous structure, greater than about 80% of said fluid is retained by the porous structure.
Claim 13
Dependent Claim
38 words
The porous structure of claim 1 wherein upon the passage of about 5 minutes from the moment the Bovine blood-oxalate enters the undisturbed porous structure, greater than about 92% of said fluid is retained by the porous structure.
Claim 14
Dependent Claim
183 words
A porous structure comprising: a first porous layer having a density of at least about 0.01 g/cc and a basis weight of from between about 0.25 osy to about 3 osy, and wherein the first porous layer is adapted to absorb and distribute fluid Bovine blood oxalate therein and to urge said fluid towards; a second porous layer juxtaposed upon and in contact with said first porous layer, wherein the second porous layer has a density of at least about 0.01 g/cc and a basis weight of from between about 0.25 osy to about 5 osy, and wherein the second porous layer is adapted to retain said fluid urged by the first porous layer; and wherein the porous structure is adapted to absorb at least 2 milliliters of fluid Bovine blood-oxalate in less than 45 seconds and upon the passage of about 5 minutes from the moment the Bovine blood-oxalate enters the undisturbed porous structure, less than 25% of said fluid is retained by the first porous layer and greater than about 75% of said fluid is retained by the second porous layer.
Claim 15
Dependent Claim
183 words
A porous structure comprising: a first porous layer having a density of at least about 0.01 g/cc and a basis weight of from between about 0.25 osy to about 3 osy, and wherein the first porous layer is adapted to absorb and distribute fluid Bovine blood oxalate therein and to urge said fluid towards; a second porous layer juxtaposed upon and in contact with said first porous layer, wherein the second porous layer has a density of at least about 0.01 g/cc and a basis weight of from between about 0.25 osy to about 5 osy, and wherein the second porous layer is adapted to retain said fluid urged by the first porous layer; and wherein the porous structure is adapted to absorb at least 2 milliliters of fluid Bovine blood-oxalate in less than 45 seconds and upon the passage of about 5 minutes from the moment the Bovine blood-oxalate enters the undisturbed porous structure, less than 25% of said fluid is retained by the first porous layer and greater than about 75% of said fluid is retained by the second porous layer.
Claim 16
Dependent Claim
22 words
The porous structure of claim 13 wherein the first porous layer is formed from melt-extruded thermoplastic fibers which include a hydrophilic additive.
Claim 17
Dependent Claim
17 words
The porous structure of claim 14 wherein the hydrophilic additive is the hydrophilic additive of claim 8.
Claim 18
Dependent Claim
60 words
The porous structure of claim 13 wherein the second porous layer is formed from fibers and wherein after about 5 minutes from the application of said fluid, between about 8% to about 14% of said fluid is present in the first porous layer and between about 92% to about 86% of the fluid is present in the second porous layer.
Claim 19
Dependent Claim
18 words
The porous structure of claim 16 where in the second porous layer is formed from melt-extruded thermoplastic fibers.
Claim 20
Dependent Claim
55 words
The porous structure of claim 13 wherein the first porous layer is formed from melt-extruded thermoplastic fibers having a hydrophilic additive and is adapted for urging an aqueous fluid in contact therewith towards the second porous layer; and wherein the second porous layer is adapted for receiving said aqueous fluid from the first porous layer.
Claim 21
Dependent Claim
32 words
The porous structure of claim 18 wherein the some of the thermoplastic fibers forming the first porous layer are bi-component thermoplastic fibers having a first polymer component and a second polymer component.
Claim 22
Dependent Claim
27 words
The porous structure of claim 19 wherein the first component is a homopolymer and wherein the orientation of the first and second polymer components is generally side-by-side.
Claim 23
Dependent Claim
11 words
The porous structure of claim 20 wherein the homopolymer is polypropylene.
Claim 24
Dependent Claim
42 words
The porous structure of claim 19 wherein the second polymer component is formed from polypropylene and ethylene and wherein the percent by weight of polypropylene is at least about 90% and the percent by weight of ethylene is at least about 0.1%.
Claim 25
Dependent Claim
24 words
The porous structure of claim 13 wherein the basis weight of the first layer is from between about 1.0 osy to about 3 osy.
Claim 26
Dependent Claim
22 words
The porous structure of claim 13 wherein the basis weight of the first layer is from between 0.7 osy to 1.0 osy.
Claim 27
Dependent Claim
67 words
A surgical drape comprising: portions thereof defining an opening sized for overlying an operative site of a patient; a porous structure secured to the drape adjacent said opening; wherein the porous structure comprise the porous structure of claim 13, and wherein the first porous layer is formed from melt-extruded thermoplastic fibers and wherein a hydrophilic additive is present in the melt-extruded fibers of the first porous layer.
Claim 28
Dependent Claim
26 words
The porous structure of claim 25 wherein some of the thermoplastic fibers are bi-component thermoplastic fibers having a first polymer component and a second polymer component.
Claim 29
Dependent Claim
27 words
The porous structure of claim 26 wherein the first component is a homopolymer and wherein the orientation of the first and second polymer components is generally side-by-side.
Claim 30
Dependent Claim
42 words
The porous structure of claim 27 wherein the homopolymer is polypropylene and the second component is selected from the group consisting of linear low density polyethylene, high density polyethylene, a co-polymer of propylene and ethylene or a combination of polypropylene and polyethylene.
Claim 31
Dependent Claim
40 words
The porous structure of claim 26 wherein the second component is formed from polypropylene and ethylene and wherein the percent by weight polypropylene is at least about 90% and the percent by weight of ethylene is at least about 0.1%.
Claim 32
Dependent Claim
17 words
The porous structure of claim 25 wherein the hydrophilic additive is the hydrophilic additive of claim 8.
Claim 33
Dependent Claim
60 words
The porous structure of claim 25 wherein the second porous layer is formed from fibers and wherein after about 5 minutes from the application of said fluid, between about 8% to about 14% of said fluid is present in the first porous layer and between about 92% to about 86% of the fluid is present in the second porous layer.
Claim 34
Dependent Claim
22 words
The surgical drape of claim 25 wherein the basis weight of the first layer is from between 1.0 osy to 3 osy.
Claim 35
Dependent Claim
22 words
The surgical drape of claim 25 wherein the basis weight of the first layer is from between 0.7 osy to 1.0 osy.
Claim 36
Dependent Claim
111 words
An absorbent article comprising: a cover juxtaposed upon and in contact with an absorbent structure; wherein the absorbent structure includes; the porous structure of claim 3 wherein the first porous layer comprises melt-extruded thermoplastic fibers, and wherein a hydrophilic additive is present in the melt-extruded thermoplastic fibers, and wherein the second porous layer is formed from melt-extruded thermoplastic fibers having at least about 5% by weight of polybutylene and at least about 50% by weight of polypropylene, wherein said second porous layer is juxtaposed upon and in contact with said first porous layer, and wherein a third layer is juxtaposed upon and in contact with said second layer and said cover.
Claim 37
Dependent Claim
24 words
The absorbent article of claim 4 wherein the basis weight of the first layer is from between about 1.0 osy to about 3 osy.
Claim 38
Dependent Claim
22 words
The absorbent article of claim 34 wherein the basis weight of the first layer is from between 0.7 osy to 1.0 osy.
References Cited (Backward Citations)
US3182656A
Cited
US3423266A
Cited
US3410266A
Cited
US3538912A
Cited
US3561439A
Cited
US3802817A
Cited
US3692618A
Cited
US3668050A
Cited
US3766913A
Cited
US3669106A
Cited
CA969439A
Cited
USRE27710E
Cited
US3791381A
Cited
US3881474A
Cited
US3902484A
Cited
US3799161A
Cited
US3837995A
Cited
US4041203A
Cited
US3856006A
Cited
US3930497A
Cited
US3926185A
Cited
US3910268A
Cited
US3942523A
Cited
US3952738A
Cited
US3955569A
Cited
US4027665A
Cited
US4033341A
Cited
US4134398A
Cited
US4024862A
Cited
US4041942A
Cited
US4119093A
Cited
US4081582A
Cited
US4082886A
Cited
US4204532A
Cited
US4169472A
Cited
US4275105A
Cited
US4196245A
Cited
US4287251A
Cited
US4196723A
Cited
US4239792A
Cited
US4383476A
Cited
US4263363A
Cited
US4298649A
Cited
US4479492A
Cited
US4355066A
Cited
US4466430A
Cited
US4379192A
Cited
US4489720A
Cited
US4553539A
Cited
US4547420A
Cited
US4795668A
Cited
US4729371A
Cited
US4607631A
Cited
US4522203A
Cited
US4595629A
Cited
US4616642A
Cited
US4627427A
Cited
US4664103A
Cited
US4596245A
Cited
US4730609A
Cited
US4699620A
Cited
US4668566A
Cited
US4778460A
Cited
US4758239A
Cited
US4828556A
Cited
US4713068A
Cited
US4906513A
Cited
US5108827A
Cited
US5294482A
Cited
US4904521A
Cited
US5204174A
Cited
US5165979A
Cited
US5241009A
Cited
US5271883A
Cited
EP0474123A1
Cited
US5114787A
Cited
US5149576A
Cited
US5178931A
Cited
US5178932A
Cited
US5145727A
Cited
US5151314A
Cited
US5222507A
Cited
US5398700A
Cited
US5394891A
Cited
US5238733A
Cited
US5232770A
Cited
US5229191A
Cited
US5341821A
Cited
US5454381A
Cited
US5244482A
Cited
EP0604738A1
Cited
US5455074A
Cited
US5348547A
Cited
WO1995003172A1
Cited
GB2282101A
Cited
US5460884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-30 | 2000-01-29 | 2000-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-30 | 2004-01-29 | 2004-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-30 | 2008-01-29 | 2008-07-30 | $7700.00 | Window Closed / Lapsed |