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US5264276A
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US
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Chemically protective laminate
Assignee: W.L. Gore and Associates Inc
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Filing: 1993-01-07
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Granted: 1993-11-23
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Expires: 2013-01-07
Abstract
Abstract A chemically protective laminate comprising a thin thermoplastic barrier layer, having a consistent thickness, laminated between two porous polymeric membrane layers. The porous polymeric membrane may be of porous polytetrafluoroethylene, preferably expanded porous polytetrafluoroethylene. The chemically protective laminate may be subsequently adhered to a backing to form a fabric laminate capable of being assembled into a chemically protective article.
Inventors
- 👤 Gordon L. McGregor
- 👤 Richard Winkelmayer, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:27
CPC Classifications
A; A62; A62D; A62D5/00; B; B32; B32B; B32B5/00; B32B5/22; B32B5/32; Y; Y10; Y10S; Y10S2/00; Y10S2/904; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/31504; Y10T428/31536; Y10T428/3154; Y10T442/00; Y10T442/30; Y10T442/3854; Y10T442/3878; Y10T442/40; Y10T442/60; Y10T442/674; Y10T442/677
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
A chemically protective laminate comprising, in sequence: (a) a layer of porous polytetrafluoroethylene, (b) a thin layer of a thermoplastic barrier polymer having a thickness of between 51 microns and 130 micron and being adhered on a first side to the layer of porous polytetrafluoroethylene, said thin layer having a consistent thickness represented by a true coefficient of variation of 16.7% or less, (c) a second layer of porous polytetrafluoroethylene located on the other side of layer (a), (d) a backing layer adhered to one of the porous polytetrafluoroethylene layers.
Claim 2
Dependent Claim
90 words
A chemically protective laminate comprising, in sequence: (a) a layer of porous polytetrafluoroethylene, (b) a thin layer of a thermoplastic barrier polymer having a thickness of between 51 microns and 130 micron and being adhered on a first side to the layer of porous polytetrafluoroethylene, said thin layer having a consistent thickness represented by a true coefficient of variation of 16.7% or less, (c) a second layer of porous polytetrafluoroethylene located on the other side of layer (a), (d) a backing layer adhered to one of the porous polytetrafluoroethylene layers.
Claim 3
Dependent Claim
20 words
A chemically protective laminate of claim 1 wherein the thin layer of thermoplastic barrier polymer is a fluorinated thermoplastic polymer.
Claim 4
Dependent Claim
18 words
A chemically protective laminate of claim 2 wherein the layer of fluorinated thermoplastic polymer is fluorinated ethylene propylene.
Claim 5
Dependent Claim
46 words
A chemically protective laminate of claim 2 wherein the layer of fluorinated thermoplastic polymer is selected from the group consisting of a copolymer of tetrafluoroethylene and perfluoro(propylvinyl ether), homopolymers of polychlorotrifluoroethylene and its copolymers with TFE or VF2, ethylene-chlorotrifluoroethylene copolymer, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, and polyvinylfluoride.
Claim 6
Dependent Claim
25 words
A chemically protective laminate of claim 1 wherein the thin layer of thermoplastic barrier polymer is selected from the group consisting of polyethylene and polypropylene.
Claim 7
Dependent Claim
14 words
A chemically protective laminate of claim 1 wherein the backing layer is a fabric.
Claim 8
Dependent Claim
15 words
A chemically protective laminate of claim 1 wherein the backing layer is a synthetic material.
Claim 9
Dependent Claim
19 words
A chemically protective laminate of claim 1 wherein the backing layer is made of fibers of expanded porous polytetrafluoroethylene.
Claim 10
Dependent Claim
15 words
A chemically protective laminate of claim 1, wherein the porous polytetrafluoroethylene is expanded porous polytetrafluoroethylene.
Claim 11
Dependent Claim
53 words
A process for producing a chemically protective laminate, comprising, in sequence, the steps of: (a) interposing a thin layer of a thermoplastic barrier polymer between two layers of porous polytetrafluoroethylene, (b) melting the thin layer of a thermoplastic barrier polymer, and, (c) adhering a backing layer to one of the porous polytetrafluoroethylene layers.
Claim 12
Dependent Claim
53 words
A process for producing a chemically protective laminate, comprising, in sequence, the steps of: (a) interposing a thin layer of a thermoplastic barrier polymer between two layers of porous polytetrafluoroethylene, (b) melting the thin layer of a thermoplastic barrier polymer, and, (c) adhering a backing layer to one of the porous polytetrafluoroethylene layers.
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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) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |