US5496627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite fibrous filters
Assignee: Clemson University Research Foundation
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Filing: 1995-06-16
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Granted: 1996-03-05
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Expires: 2015-06-16
Abstract
Abstract Disclosed are novel composite fibrous structures which have utility as filters. These composite structures have at least two layers. The first layer is a nonwoven fibrous structure made from uniquely grooved fibers. The second layer is of a fibrous material that offers high filter efficiency.. The first layer has significantly lower pressure drop and higher dust holding capacity than the second layer.
Inventors
- 👤 Shriram Bagrodia
- 👤 Bobby M. Phillips
- 👤 William A. Haile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:08
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; B32B5/02; B32B5/06; B32B7/00; B32B7/02; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2262/0276; B32B2262/0284; B32B2307/00; B32B2307/70; B32B2307/718; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/609; Y10T442/611; Y10T442/68
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
141 words
A filter for removing particulate matter from a fluid stream comprising a first layer of fibrous material and a second layer of fibrous material, said layers being in face-to-face contact, a) said first layer comprising fibers having a denier of about 3-15 and grooved in the longitudinal direction, said fibers having a cross-sectional shape factor of greater than 1.5 and a specific volume of about 1.5-5 cc/g, and b) said second layer comprising melt blown, thermally bonded fibers having a denier of about 0.1-1.0 wherein the pressure drop across said second layer is much greater than the pressure drop across said first layer, the particle holding capacity of said first layer is much greater than the particle holding capacity of said second layer, and the filtration efficiency of said second layer is greater than the filtration efficiency of said first layer.
Claim 2
Dependent Claim
141 words
A filter for removing particulate matter from a fluid stream comprising a first layer of fibrous material and a second layer of fibrous material, said layers being in face-to-face contact, a) said first layer comprising fibers having a denier of about 3-15 and grooved in the longitudinal direction, said fibers having a cross-sectional shape factor of greater than 1.5 and a specific volume of about 1.5-5 cc/g, and b) said second layer comprising melt blown, thermally bonded fibers having a denier of about 0.1-1.0 wherein the pressure drop across said second layer is much greater than the pressure drop across said first layer, the particle holding capacity of said first layer is much greater than the particle holding capacity of said second layer, and the filtration efficiency of said second layer is greater than the filtration efficiency of said first layer.
Claim 3
Dependent Claim
16 words
A filter according to claim 1 having a plurality of at least one of said layers.
Claim 4
Dependent Claim
18 words
A filter according to claim 1 wherein the combined thickness of said layers is at least 0.1 inch.
Claim 5
Dependent Claim
18 words
A filter according to claim 1 wherein the combined thickness of said layers is at least 0.5 inch.
Claim 6
Dependent Claim
22 words
A filter according to claim 1 wherein the fibers of at least one of said layers are randomly oriented and bonded together.
Claim 7
Dependent Claim
19 words
A filter according to claim 1 wherein the fibers of at least one of said layers are thermally bonded.
Claim 8
Dependent Claim
19 words
A filter according to claim 1 wherein the fibers of at least one of said layers are needle punched.
Claim 9
Dependent Claim
22 words
A filter according to claim 1 wherein the fibers of at least one of said layers are melt blown into a mat.
Claim 10
Dependent Claim
19 words
A filter according to claim 1 wherein the fibers of at least one of said layers are electrostatically charged.
Claim 11
Dependent Claim
13 words
A filter according to claim 1 wherein said first layer fibers are polyester.
Claim 12
Dependent Claim
18 words
A filter according to claim 1 wherein said first layer fibers are polymers or copolymers of ethylene terephthalate.
Claim 13
Dependent Claim
13 words
A filter according to claim 1 wherein said second layer fibers are polyolefin.
Claim 14
Dependent Claim
13 words
A filter according to claim 1 wherein said second layer fibers are polypropylene.
Claim 15
Dependent Claim
24 words
A filter according to claim 1 wherein said first layer has a weight of about 1 oz/yd 2 to about 30 oz/yd 2 .
Claim 16
Dependent Claim
22 words
The method of filtering particulate matter from a fluid stream which comprises placing a filter according to claim 1 into said stream.
Claim 17
Dependent Claim
12 words
The method according to claim 1 wherein said particulate matter is solid.
Claim 18
Dependent Claim
12 words
The method according to claim 16 wherein said particulate matter is liquid.
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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) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |