Patent US5580459A successfully refreshed from Google Patents.
US5580459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration structures of wet laid, bicomponent fiber
Assignee: Invista North America LLC
•
Filing: 1992-12-31
•
Granted: 1996-12-03
•
Expires: 2012-12-31
Abstract
Abstract A filtration structure comprising a thermally bonded, wet laid, fibrous web and support is provided. The web is formed from bicomponent fiber comprising a structure-forming component and a heat-bondable component. Also provided is a filtration method using the filtration structure. Beneficially, the filtration structure may include microfiber.
Inventors
- 👤 Edward J. Powers
- 👤 Steve F. Nielsen
- 👤 Jeanne E. Smith
- 👤 Theodore S. Thornburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:06
CPC Classifications
D; D21; D21H; D21H27/00; D21H27/08; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; B01D39/20; B01D39/2003; B01D39/2017; B01D39/2024; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D21H15/00; D21H15/02; D21H15/10; D21H13/00; D21H13/10; D21H13/12; D21H13/14; D21H13/20; D21H13/24; D21H13/36; D21H13/38; D21H13/40; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/623; Y10T442/637; Y10T442/641
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
36 words
A filtration structure comprising a thermally bonded, wet laid, fibrous web, and a suitable filtration support structure; said fibrous web being formed from bicomponent fiber comprising a web structure-forming core component and a heat-bondable sheath component.
Claim 2
Dependent Claim
36 words
A filtration structure comprising a thermally bonded, wet laid, fibrous web, and a suitable filtration support structure; said fibrous web being formed from bicomponent fiber comprising a web structure-forming core component and a heat-bondable sheath component.
Claim 3
Dependent Claim
15 words
The filtration structure of claim 1, wherein said support structure is an underlying support structure.
Claim 4
Dependent Claim
29 words
The filtration structure of claim 1, wherein said web structure-forming core component is a polyester, and said heat-bondable sheath component is a suitable blend of LLDPE and grafted HDPE.
Claim 5
Dependent Claim
45 words
A filtration method comprising passing a particulate-containing fluid through a thermally bonded, wet laid fibrous web formed from bicomponent fiber comprising a web structure forming core component and a heat-bondable sheath component; said wet laid, fibrous web is supported on a suitable filtration support structure.
Claim 6
Dependent Claim
45 words
A filtration method comprising passing a particulate-containing fluid through a thermally bonded, wet laid fibrous web formed from bicomponent fiber comprising a web structure forming core component and a heat-bondable sheath component; said wet laid, fibrous web is supported on a suitable filtration support structure.
Claim 7
Dependent Claim
53 words
A filtration structure comprising a thermally bonded, wet laid, heterofiber matrix, said heterofiber matrix being formed from bicomponent fiber comprising a structure-forming core component and a heat-bondable sheath component, and from microfiber having a diameter of less than about 2 microns; said wet laid heterofiber matrix is supported on a suitable filtration support.
Claim 8
Dependent Claim
53 words
A filtration structure comprising a thermally bonded, wet laid, heterofiber matrix, said heterofiber matrix being formed from bicomponent fiber comprising a structure-forming core component and a heat-bondable sheath component, and from microfiber having a diameter of less than about 2 microns; said wet laid heterofiber matrix is supported on a suitable filtration support.
Claim 9
Dependent Claim
11 words
The filtration structure of claim 5, wherein said microfiber is fiberglass.
Claim 10
Dependent Claim
28 words
The filtration structure of claim 5, wherein said structure-forming core component is a polyester, and said heat-bondable sheath component is a suitable blend of LLDPE and grafted HDPE.
References Cited (Backward Citations)
US4765812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |