Patent US5538545A successfully refreshed from Google Patents.
US5538545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonparticulating adsorbent recirculating filter
Assignee: W.L. Gore and Associates Inc
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Filing: 1994-11-04
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Granted: 1996-07-23
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Expires: 2014-11-04
Abstract
Abstract The present invention is an improved sorbent filter for use in both particulate filtration and absorption of gaseous contaminants in a variety of applications, such as for filtration in a computer disk drive. The filter of the present invention provides previously unavailable levels of combined particulate filtration and contaminant sorption while being capable of ready reconditioning (such as through washing with D.I. water).
Inventors
- 👤 Edwin G. Dauber
- 👤 Douglas B. McKenna
- 👤 Michael S. Winterling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:59
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/2805; B01D; B01D53/00; B01D53/02; B01D53/04; B01D39/00; B01D39/14; B01D39/16; B01D39/1692; B01D46/00; B01D46/10; B01D53/0407; B01D53/0415; B01J20/28033; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/20; B01D2253/206; B01D2253/25; B01D2257/00; B01D2257/20; B01D2257/202; B01D2257/2025; B01D2257/30; B01D2257/302
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
75 words
A sorbent filter for selectively sorbing contaminants present in an environment, the filter having a height, depth and length, the sorbent filter comprising: at least one protective support layer; at least one filter layer; an inner sorbent core, the core including a soluble sorbent therein for removing contaminants from the environment; wherein the support layer and the filter layer cover the core and allow the filter to be washed without removing sorbents from the core.
Claim 2
Dependent Claim
75 words
A sorbent filter for selectively sorbing contaminants present in an environment, the filter having a height, depth and length, the sorbent filter comprising: at least one protective support layer; at least one filter layer; an inner sorbent core, the core including a soluble sorbent therein for removing contaminants from the environment; wherein the support layer and the filter layer cover the core and allow the filter to be washed without removing sorbents from the core.
Claim 3
Dependent Claim
25 words
The filter of claim 1 wherein the filter includes a perimeter seal sealing the filter layer and the protective support layer around the sorbent core.
Claim 4
Dependent Claim
18 words
The filter of claim 1 wherein the filter layer comprises at least one layer of porous expanded polytetrafiuoroethylene.
Claim 5
Dependent Claim
12 words
The filter of claim 1 wherein the soluble sorbent comprises a chemisorber.
Claim 6
Dependent Claim
12 words
The filter of claim 1 wherein the soluble sorbent comprises a physisorber.
Claim 7
Dependent Claim
25 words
The filter of claim 1 wherein the filter layer includes a filler selected from the group consisting of an electret material and a triboelectret material.
Claim 8
Dependent Claim
22 words
The filter of claim 1 wherein the filter layer comprises a triboelectric filter comprising a mixture of polytetrafluoroethylene fibers and polyamide fibers.
Claim 9
Dependent Claim
83 words
The filter of claim 1 wherein: the support layer comprises at least two layers, one layer mounted on a top side of the filter and a second layer mounted on a bottom side of the filter; and the filter layer comprises at least two layers, one layer mounted on the top side of the filter between the support layer and the sorbent core and the second layer mounted on the bottom side of the filter between the support layer and the sorbent core.
Claim 10
Dependent Claim
18 words
The filter of claim 8 wherein the sorbent core comprises a combination of polytetrafluoroethylene and a sorbent filler.
Claim 11
Dependent Claim
16 words
The filter of claim 9 wherein the sorbent core is needled to improve air flow therethrough.
Claim 12
Dependent Claim
27 words
The filter of claim 8 wherein a perimeter seal is provided attaching the top support layer and filter layer to the bottom support layer and filter layer.
Claim 13
Dependent Claim
30 words
The filter of claim 1 wherein the support layer is selected from at least one of the group consisting of an expanded polyethylene, woven polyethylene, polyester, polypropylene, and porous polytetrafluoroethylene.
Claim 14
Dependent Claim
14 words
The filter of claim 1 wherein the sorbent core comprises an ion exchange resin.
Claim 15
Dependent Claim
12 words
The filter of claim 1 wherein the sorbent core comprises a catalyst.
Claim 16
Dependent Claim
69 words
A sorbent recirculation filter for selectively sorbing contaminants present within an enclosed environment housing sensitive equipment that comprises: an inner sorbent core having soluble sorbent material therein; and a hydrophobic cover surrounding the core, the cover including a filtration layer comprising a hydrophobic porous expanded polytetrafluoroethylene; wherein the core and cover combine to provide a filter that can be washed to remove ionic contamination without damaging the sorbent material.
Claim 17
Dependent Claim
69 words
A sorbent recirculation filter for selectively sorbing contaminants present within an enclosed environment housing sensitive equipment that comprises: an inner sorbent core having soluble sorbent material therein; and a hydrophobic cover surrounding the core, the cover including a filtration layer comprising a hydrophobic porous expanded polytetrafluoroethylene; wherein the core and cover combine to provide a filter that can be washed to remove ionic contamination without damaging the sorbent material.
Claim 18
Dependent Claim
18 words
The filter of claim 15 wherein the sorbent core comprises a combination of polytetrafluoroethylene and a sorbent filler.
Claim 19
Dependent Claim
16 words
The filter of claim 15 wherein the sorbent core is needled to improve air flow therethrough.
Claim 20
Dependent Claim
20 words
The filter of claim 15 wherein the filter includes a perimeter seal sealing the hydrophobic cover around the sorbent core.
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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) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |