Patent US4618524A successfully refreshed from Google Patents.
US4618524A
Expired / Lapsed
US
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Microporous multilayer nonwoven material for medical applications
Assignee: Carl Freudenberg KG
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Filing: 1985-09-17
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Granted: 1986-10-21
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Expires: 2005-09-17
Abstract
Abstract A microporous, multilayer material has a layer of microfibers having a weight of from about 0.5 to about 60 g/m 2 , the microfibers having diameters of from about 0.1 to about 10 microns. The microfiber layer is covered on opposite sides with nonwoven layers and all the layers are bonded together with a pattern of water repellent and, preferably, elastic paste members sufficiently penetrating through the layers. A process for making the microporous, multilayer material imprints the paste for the penetration-bonding paste members on one or both sides of the layers only squeezed dry after washing and water-repellentizing baths.
Inventors
- 👤 Dieter Groitzsch
- 👤 Erich Fahrbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/593; A; A61; A61B; A61B46/00; A61B46/40; D04H1/64; D04H1/66; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
A microporous, multilayer nonwoven material, comprising: a layer of nonwoven, microfiber material having a weight of from about 0.5 to about 60 g/m 2 , each microfiber thereof being hydrophobic and having a diameter of from about 0.1 to about 10 microns; nonwoven layers covering opposite sides of the microfiber layer; and water-repellent paste members penetrating through the layers in a pattern across the layers sufficient for bonding the layers together.
Claim 2
Dependent Claim
71 words
A microporous, multilayer nonwoven material, comprising: a layer of nonwoven, microfiber material having a weight of from about 0.5 to about 60 g/m 2 , each microfiber thereof being hydrophobic and having a diameter of from about 0.1 to about 10 microns; nonwoven layers covering opposite sides of the microfiber layer; and water-repellent paste members penetrating through the layers in a pattern across the layers sufficient for bonding the layers together.
Claim 3
Dependent Claim
13 words
The material of claim 1, wherein the paste members are elastic and rod-like.
Claim 4
Dependent Claim
55 words
The material of claim 2, wherein each rod-like paste member has at lest one projection from each end along the layers, whereby the paste members may have been imprinted as bars onto opposite sides of the material with each bar penetrating into the material only far enough for contacting the bar from the other side.
Claim 5
Dependent Claim
33 words
The material of claim 3, wherein the projections from each end of the paste members are at an angle of about 90° to each other, whereby the bars were similarly oriented when imprinted.
Claim 6
Dependent Claim
18 words
The material of claim 1, wherein at least one of the covering nonwoven layers contains a water-repellent agent.
Claim 7
Dependent Claim
18 words
The material of claim 2, wherein at least one of the covering nonwoven layers contains a water-repellent agent.
Claim 8
Dependent Claim
18 words
The material of claim 3, wherein at least one of the covering nonwoven layers contains a water-repellent agent.
Claim 9
Dependent Claim
17 words
The material of claim 1, wherein at least one of the covering nonwoven layers contains hydrophilic fibers.
Claim 10
Dependent Claim
17 words
The material of claim 2, wherein at least one of the covering nonwoven layers contains hydrophilic fibers.
Claim 11
Dependent Claim
17 words
The material of claim 3, wherein at least one of the covering nonwoven layers contains hydrophilic fibers.
Claim 12
Dependent Claim
17 words
The material of claim 5, wherein at least one of the covering nonwoven layers contains hydrophilic fibers.
Claim 13
Dependent Claim
19 words
The material of claim 1, wherein at least one of the covering layers has a pattern-wise bonding agent therein.
Claim 14
Dependent Claim
22 words
The material of claim 2, wherein at least one of the covering layers is full surface bonded with a swellable bonding agent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |