US5096473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration fabric laminates
Assignee: W.L. Gore and Associates Inc
•
Filing: 1991-03-01
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Granted: 1992-03-17
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Expires: 2011-03-01
Abstract
Abstract A filter composite is made of a porous polytetrafluoroethylene (PTFE) and a fabric. The PTFE and fabric are bonded by an adhesive. The adhesive is prevented from penetrating the fabric by employing a coating of an oil and water-repellent material to the surface of the fabric adjacent the adhesive.
Inventors
- 👤 Robert Sassa
- 👤 Todd Johnson
- 👤 Richard Winkelmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:42
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; B01; B01D; B01D39/00; B01D39/08; B01D39/083; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D71/36; B32B27/32; B32B27/322; B32B5/00; B32B5/22; B32B5/24; B32B7/00; B32B7/04; B32B7/12; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/0478; B01D2239/06; B01D2239/0604; B01D2239/0618; B01D2239/065; B01D2239/0668; B01D2239/0681; B32B2305/00; B32B2305/02; B32B2305/026; B32B2307/00; B32B2307/70; B32B2307/726; B32B2307/7265; B32B2327/00; B32B2327/12; B32B2327/18; B32B2439/00; B32B2439/02; B32B2439/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
40 words
A porous composite comprising a layer of porous polytetrafluoroethylene adhered by an adhesive to fabric of a synthetic polymer that has an oil and water resistant polymer present in a manner which prevents adhesive from substantially wicking into the fabric.
Claim 2
Dependent Claim
40 words
A porous composite comprising a layer of porous polytetrafluoroethylene adhered by an adhesive to fabric of a synthetic polymer that has an oil and water resistant polymer present in a manner which prevents adhesive from substantially wicking into the fabric.
Claim 3
Dependent Claim
14 words
The porous composite of claim 1 wherein the synthetic polymer is a thermoset polymer.
Claim 4
Dependent Claim
12 words
The porous composite of claim 1 wherein the synthetic polymer is polyacrylonitrile.
Claim 5
Dependent Claim
24 words
The porous composite of claims 1, 2, or 3 wherein the oil and water-resistant polymer comprises a coating between the adhesive and the fabric.
Claim 6
Dependent Claim
18 words
The porous composite of claims 1, 2, or 3 wherein the oil and water-resistant polymer permeates the fabric.
Claim 7
Dependent Claim
13 words
The porous composite of claim 1 in the form of a filter bag.
Claim 8
Dependent Claim
37 words
Process for filtering particulate from an air stream which comprising forming a filter bag from the porous composite defined in claim 1, placing the bag in an enclosure for filtering air, and passing air through the bag.
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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) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |