Patent US5328758A successfully refreshed from Google Patents.
US5328758A
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US
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Particle-loaded nonwoven fibrous article for separations and purifications
Assignee: 3M Co
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Filing: 1992-08-14
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Granted: 1994-07-12
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Expires: 2012-08-14
Abstract
Abstract A particle loaded, porous, fibrous compressed or fused article comprises a nonwoven fibrous polymeric web, which preferably is thermoplastic, melt-extrudable, and pressure-fusible blown microfibrous web, and sorptive particles enmeshed in said web, the particle loaded fibrous article has a Gurley number of at least two seconds, and the article is useful in separation science. A method of preparation of the article and method of use is also disclosed.
Inventors
- 👤 Craig G. Markell
- 👤 Donald F. Hagen
- 👤 Paul E. Hansen
- 👤 Nicholas R. Baumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:44
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28028; B01D; B01D15/00; B01D15/08; B01J20/28033; B01J20/28052; B01J20/28054; B01J20/28078; B01J20/28085; B01J47/00; B01J47/018; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56; B01D15/26; B01D15/36; B01D15/361; B01D15/38; B01D15/3804; B01D15/3833; G; G01; G01N; G01N30/00; G01N30/02; G01N30/50; G01N30/52; G01N2030/524; G01N2030/528; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1043; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T428/25; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/626; Y10T442/699
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
79 words
A particle loaded, porous, fibrous, at least one of at least one of compressed or fused, article comprising a) a thermoplastic nonwoven fibrous polymeric web, and b) sorptive particles enmeshed in said web, wherein said particle loaded fibrous article has been compressed or fused by at least one of calendering, heating, and applying pressure to provide said article with controlled porosity and a Gurley number of at least four seconds, and wherein said article is useful in separation science.
Claim 2
Dependent Claim
79 words
A particle loaded, porous, fibrous, at least one of at least one of compressed or fused, article comprising a) a thermoplastic nonwoven fibrous polymeric web, and b) sorptive particles enmeshed in said web, wherein said particle loaded fibrous article has been compressed or fused by at least one of calendering, heating, and applying pressure to provide said article with controlled porosity and a Gurley number of at least four seconds, and wherein said article is useful in separation science.
Claim 3
Dependent Claim
23 words
The article according to claim 1 comprising a nonwoven fibrous web selected from the group consisting of polyamide, polyolefin, polyurethane, polyester, and polyvinylhalide.
Claim 4
Dependent Claim
19 words
The article according to claim 1 having a thickness of at least 20 percent less than an unpressed article.
Claim 5
Dependent Claim
29 words
The article according to claim 1 comprising in the range of 30 to 70 volume percent polymeric fibers and in the range of 70 to 30 volume percent air.
Claim 6
Dependent Claim
11 words
The article according to claim 2 wherein said polyolefin is polypropylene.
Claim 7
Dependent Claim
38 words
The article according to claim 1 wherein said particles are selected from the group consisting of an organic compound or polymer, an inorganic oxide, carbon, and a support particle coated with an insoluble, non-swellable sorbed or bonded coating.
Claim 8
Dependent Claim
22 words
The article according to claim 4 wherein said inorganic oxide is selected from the group consisting of silica, alumina, titania, and zirconia.
Claim 9
Dependent Claim
31 words
The article according to claim 6 wherein said sorbed coating is polybutadiene or said covalently bonded coating is selected from the group consisting of a cyano, cyclohexyl, octyl, and octadecyl group.
Claim 10
Dependent Claim
38 words
The article according to claim 1 wherein said polymer is present in the range of 5 to less than 100 weight percent and said particles are present in the range of more than 0 to 95 weight percent.
Claim 11
Dependent Claim
19 words
The article according to claim 1 wherein said particles comprise at least 20 weight percent of said fibrous web.
Claim 12
Dependent Claim
19 words
The article according to claim 1 wherein said particles comprise at least 50 weight percent of said fibrous web.
Claim 13
Dependent Claim
19 words
The article according to claim 1 wherein said particles comprise at least 80 weight percent of the fibrous web.
Claim 14
Dependent Claim
34 words
The article according to claim 1 further comprising up to 20 weight percent property modifiers to aid at least one of increasing hydrophilicity or hydrophobicity, to indicate pH, to facilitate processing, and in coloring.
Claim 15
Dependent Claim
22 words
The article according to claim 1 wherein said pores have a mean pore size in the range of 0.2 to 10 micrometers.
Claim 16
Dependent Claim
14 words
The article according to claim 1 wherein said Gurley time is at least 5.
Claim 17
Dependent Claim
15 words
The article according to claim 1 wherein said sorptive particles are ion-exchange or chelating particles.
Claim 18
Dependent Claim
13 words
The article according to claim 1 wherein said sorptive particles have chiral functionality.
Claim 19
Dependent Claim
13 words
The article according to claim 1 wherein said sorptive particles have affinity functionality.
Claim 20
Dependent Claim
13 words
The article according to claim 1 which is a solid phase extraction medium.
Claim 21
Dependent Claim
11 words
The article according to claim 1 which is a chromatographic medium.
Claim 22
Dependent Claim
28 words
A stack of 2 or more disks wherein each disk is a solid phase extraction medium and at least one of said disks is according to claim 1.
Claim 23
Dependent Claim
17 words
The article according to claim 1 wherein said thermoplastic, nonwoven, fibrous, polymeric web is a melt-blown web.
References Cited (Backward Citations)
US3764527A
Cited
US3971373A
Cited
US4011067A
Cited
US4160059A
Cited
US4565663A
Cited
US4460642A
Cited
US4512897A
Cited
EP0080382A2
Cited
GB2113731A
Cited
US4469734A
Cited
US4429001A
Cited
US4433024A
Cited
US4684570A
Cited
EP0159696A2
Cited
US4604203A
Cited
US4797318A
Cited
US4868032A
Cited
US4971736A
Cited
US4810381A
Cited
US4906378A
Cited
US4793837A
Cited
US4957943A
Cited
US4971697A
Cited
US4985296A
Cited
US4933229A
Cited
US5071610A
Cited
US5029699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |