EP0391660A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Filter laminates
Assignee: W.L. Gore and Associates Inc
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Filing: 1990-04-03
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Granted: —
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Expires: 2010-04-03
Abstract
Abstract An expanded porous polytetrafluoroethylene (PTFE) membrane (11) is employed in laminar conjunction with a polytetrafluoroethylene felt (13); in which the felt (13) is reinforced with a woven scrim (14).
Inventors
- 👤 Robert Louis Sassa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 11:37
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/245; B01D69/00; B01D69/10; B01D69/107; B01D69/1071; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D71/36; B32B27/00; B32B27/12; B32B5/02; B32B5/06; B32B5/18; B32B5/26; B32B7/00; B32B7/04; B32B7/12; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/06; B01D2239/065; B01D2239/0654; B01D2239/0659; B01D2239/0681; B01D2239/12; B01D2239/1258; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2266/00; B32B2266/02; B32B2266/0214; B32B2266/025; B32B2307/00; B32B2307/70; B32B2307/724; B32B2437/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1352; Y10T428/1362; Y10T428/1366; Y10T428/249921; Y10T428/249953; Y10T428/24996; Y10T428/249981; Y10T428/249982; Y10T428/249985; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/159
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
A laminate characterised in that it comprises a) an expanded porous polytetrafluoroethylene membrane (11) having an air permeability of at least 0.01 cubic feet per square foot at 0.5 inch water gauge; b) a felt (13) comprising a web of polytetrafluoroethylene staple fibre supported by a woven scrim (14) of polytetrafluoroethylene.
Claim 2
Dependent Claim
51 words
A laminate characterised in that it comprises a) an expanded porous polytetrafluoroethylene membrane (11) having an air permeability of at least 0.01 cubic feet per square foot at 0.5 inch water gauge; b) a felt (13) comprising a web of polytetrafluoroethylene staple fibre supported by a woven scrim (14) of polytetrafluoroethylene.
Claim 3
Dependent Claim
30 words
A laminate as claimed in claim 1 wherein the woven scrim (14) is attached to the felt (13) by needle punch intermingling of the felt fibres with the scrim (14).
Claim 4
Dependent Claim
22 words
A laminate as claimed in claim 1 or 2 wherein the membrane (11) is attached to the felt by an adhesive (12).
Claim 5
Dependent Claim
15 words
A laminate as claimed in claim 3 wherein the adhesive (12) is a fluorinated polymer.
Claim 6
Dependent Claim
16 words
A laminate as claimed in any preceding claim wherein the felt (13) comprises expanded porous polytetrafluoroethylene.
Claim 7
Dependent Claim
18 words
A laminate as claimed in any of claims 1 to 4 wherein the felt (13) comprises non-expanded polytetrafluoroethylene.
Claim 8
Dependent Claim
31 words
A laminate as claimed in any preceding claims wherein the felt (13) contains up to 25 weight percent of fibre selected from carbon fibre, polyimide fibre, glass fibre and mixtures thereof.
Claim 9
Dependent Claim
14 words
A laminate as claimed in any preceding claim in the form of a cloth.
Claim 10
Dependent Claim
19 words
A laminate as claimed in any of claims 1 to 7 in the form of a filter bag (23).
References Cited (Backward Citations)
No citation records indexed.
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