US6110243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleanable filter bag assembly
Assignee: W.L. Gore and Associates Inc
•
Filing: 1998-10-09
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Granted: 2000-08-29
•
Expires: 2018-10-09
Abstract
Abstract The present invention is directed to novel filter bag assemblies comprising a support structure, such as a support cage of metal, plastic, or the like, and a filter media of expanded PTFE membrane(s) without a backing material or layer. In a preferred embodiment, the filter bag assembly further comprises a support cover, or cage cover, which fits over the exterior surface of the support, or cage, to prevent contact of the filter media with the cage.
Inventors
- 👤 Raymond M. Wnenchak
- 👤 John E. Bacino
- 👤 Stephen K. Stark
- 👤 Erik H. Wildt
- 👤 Karen Tronto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:03
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D39/00; B01D39/14; B01D39/16; B01D39/1692; B01D41/00; B01D41/04; B01D46/02; B01D46/66; B01D46/70; B01D46/71; D; D04; D04H; D04H3/00; D04H3/02; B01D2275/00; B01D2275/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
75 words
A cleanable filter bag assembly for filtering particulates from a gas stream comprising: a support cage; an air permeable cage cover covering the support cage, the cage cover having an air permeability of 550 cubic feet per minute per square foot or below, and a filter bag consisting essentially of at least one layer of expanded PTFE membrane, whereby said cage cover protects said filter bag from contact with said support cage during said filtering.
Claim 2
Dependent Claim
75 words
A cleanable filter bag assembly for filtering particulates from a gas stream comprising: a support cage; an air permeable cage cover covering the support cage, the cage cover having an air permeability of 550 cubic feet per minute per square foot or below, and a filter bag consisting essentially of at least one layer of expanded PTFE membrane, whereby said cage cover protects said filter bag from contact with said support cage during said filtering.
Claim 3
Dependent Claim
39 words
The cleanable filter bag assembly of claim 1, wherein said expanded PTFE membrane has a Ball Burst number of from 3 to 50 pounds and an air permeability of at least 1 cubic foot per minute per square foot.
Claim 4
Dependent Claim
20 words
The cleanable filter bag assembly of claim 1, wherein said filter bag includes two or more layers of expanded PTFE.
Claim 5
Dependent Claim
24 words
The cleanable filter bag assembly of claim 1, wherein said filter bag further comprises at least one filler material within said expanded PTFE membrane.
Claim 6
Dependent Claim
28 words
The cleanable filter bag assembly of claim 1, wherein said assembly further comprises an attachment means for attaching said filter bag and cage cover to said support cage.
Claim 7
Dependent Claim
25 words
The cleanable filter bag assembly of claim 1, wherein said cage cover comprises a material selected from the group consisting of polyester, aramid and polytetrafluoroethylene.
Claim 8
Dependent Claim
26 words
The cleanable filter bag assembly of claim 1, wherein said support cage comprises at least one material selected from the group consisting of metal and plastic.
Claim 9
Dependent Claim
23 words
The cleanable filter bag assembly of claim 1, wherein said air permeability is 200 cubic feet per minute per square foot or below.
Claim 10
Dependent Claim
23 words
The cleanable filter bag assembly of claim 1, wherein said air permeability is 125 cubic feet per minute per square foot or below.
Claim 11
Dependent Claim
23 words
The cleanable filter bag assembly of claim 1, wherein said air permeability is 60 cubic feet per minute per square foot or below.
Claim 12
Dependent Claim
127 words
A cleanable filter bag assembly for filtering particulates from a gas stream comprising: a support cage; an air permeable knitted polyester cage cover covering the support cage, said cage cover having an air permeability of 550 cubic feet per minute per square foot or below, a filter bag consisting essentially of at least one layer of expanded PTFE membrane, said membrane having a Ball Burst number of from 3 to 50 pounds and a gas permeability of at least 1 cubic foot per minute per square foot, and an attachment means comprising a filter cuff and hose clamp for attaching said filter bag and cage cover to said support cage, whereby said cage cover protects said filter bag from contact with said support cage during said filtering.
Claim 13
Dependent Claim
127 words
A cleanable filter bag assembly for filtering particulates from a gas stream comprising: a support cage; an air permeable knitted polyester cage cover covering the support cage, said cage cover having an air permeability of 550 cubic feet per minute per square foot or below, a filter bag consisting essentially of at least one layer of expanded PTFE membrane, said membrane having a Ball Burst number of from 3 to 50 pounds and a gas permeability of at least 1 cubic foot per minute per square foot, and an attachment means comprising a filter cuff and hose clamp for attaching said filter bag and cage cover to said support cage, whereby said cage cover protects said filter bag from contact with said support cage during said filtering.
Claim 14
Dependent Claim
23 words
The cleanable filter bag assembly of claim 11, wherein said air permeability is 200 cubic feet per minute per square foot or below.
Claim 15
Dependent Claim
23 words
The cleanable filter bag assembly of claim 11, wherein said air permeability is 125 cubic feet per minute per square foot or below.
Claim 16
Dependent Claim
23 words
The cleanable filter bag assembly of claim 11, wherein said air permeability is 60 cubic feet per minute per square foot or below.
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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) | 2003-08-29 | 2004-02-28 | 2004-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-08-29 | 2008-02-28 | 2008-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-08-29 | 2012-02-28 | 2012-08-29 | $7700.00 | Window Closed / Lapsed |