Patent US5827430A successfully refreshed from Google Patents.
US5827430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coreless and spirally wound non-woven filter element
Assignee: Pecofacet US Inc
•
Filing: 1995-10-24
•
Granted: 1998-10-27
•
Expires: 2015-10-24
Abstract
Abstract A homogeneous mixture of a base and a binder material or fiber that is compressed to form a mat or sheet of selected porosity. The binder material has at least a surface with a melting temperature lower than that of the base fiber. The sheet is formed into a selected geometric shape and thermally fused to bind the base fiber into a porous filter element. The preferred shape is a helically wound tube of plural sheets, each sheet being self-overlapped and compressed to overlap another sheet. Each sheet preferably heated and compressed individually and the sheets may be selected to have different porosities and densities. The binder fiber is selected from the group consisting of thermoplastic and resin, and the base fiber is selected from the group consisting of thermoplastic and natural.
Inventors
- 👤 Marney Dunman Perry, Jr.
- 👤 Stephen A. von Phul
- 👤 Nolan Glover
- 👤 H. C. Bradford
- 👤 Floyd Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:37
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/04; B01D27/06; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60; B29C53/607; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D39/00; B01D39/08; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/60; D04H1/70; D04H1/72; D04H1/732; B01D2201/00; B01D2201/18; B01D2201/188; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/0654; B01D2239/0668; B01D2239/069; B01D2239/0695; B01D2239/08; B01D2239/083; B01D2239/086; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0822; B29L; B29L2031/00; B29L2031/14; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1369; Y10T428/139; Y10T428/1393
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
133 words
A coreless filter element comprising: a nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder material compressed to form a first nonwoven fabric strip of selected porosity; the first nonwoven fabric strip being spirally wound upon itself in multiple overlapping layers to form a first band having a selected radial thickness; a second nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder fiber compressed to form a second nonwoven fabric strip of selected porosity which differs from the porosity of the first fabric strip; the second fabric strip being spirally wound upon itself in multiple overlapping layers to form a second band having a selected radial thickness; the first and second bands being overlapped and bonded to form a porous, self-supporting filter element.
Claim 2
Dependent Claim
133 words
A coreless filter element comprising: a nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder material compressed to form a first nonwoven fabric strip of selected porosity; the first nonwoven fabric strip being spirally wound upon itself in multiple overlapping layers to form a first band having a selected radial thickness; a second nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder fiber compressed to form a second nonwoven fabric strip of selected porosity which differs from the porosity of the first fabric strip; the second fabric strip being spirally wound upon itself in multiple overlapping layers to form a second band having a selected radial thickness; the first and second bands being overlapped and bonded to form a porous, self-supporting filter element.
Claim 3
Dependent Claim
244 words
A coreless filter element comprising: a nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder material compressed to form a first nonwoven fabric strip of selected porosity; the binder material having at least a surface with a melting temperature lower than that of the base fiber, the base fiber and the binder material being thermally fused at a temperature to melt at least the surface of the binder material to bind the base fibers, when the fabric is cooled, into the first nonwoven fabric strip; the first nonwoven fabric strip being spirally wound upon itself in multiple overlapping layers to form a first band having a selected radial thickness; a second nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder fiber compressed to form a second nonwoven fabric strip of selected porosity; the binder material of the second nonwoven fabric having at least a surface with a melting temperature lower than that of the base fiber, the base fiber and the binder material being thermally fused at a temperature to melt at least the surface of the binder material to bind the base fibers, when the sheet is cooled, into the second nonwoven fabric strip; the second fabric strip being spirally wound upon itself in multiple overlapping layers to form a second band having a selected radial thickness; the first and second bands being overlapped and bonded to form a porous, self-supporting filter element.
Claim 4
Dependent Claim
244 words
A coreless filter element comprising: a nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder material compressed to form a first nonwoven fabric strip of selected porosity; the binder material having at least a surface with a melting temperature lower than that of the base fiber, the base fiber and the binder material being thermally fused at a temperature to melt at least the surface of the binder material to bind the base fibers, when the fabric is cooled, into the first nonwoven fabric strip; the first nonwoven fabric strip being spirally wound upon itself in multiple overlapping layers to form a first band having a selected radial thickness; a second nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder fiber compressed to form a second nonwoven fabric strip of selected porosity; the binder material of the second nonwoven fabric having at least a surface with a melting temperature lower than that of the base fiber, the base fiber and the binder material being thermally fused at a temperature to melt at least the surface of the binder material to bind the base fibers, when the sheet is cooled, into the second nonwoven fabric strip; the second fabric strip being spirally wound upon itself in multiple overlapping layers to form a second band having a selected radial thickness; the first and second bands being overlapped and bonded to form a porous, self-supporting filter element.
Claim 5
Dependent Claim
29 words
The coreless filter element of claim 2, wherein the first and second nonwoven fabric strips are helically wound and thermally fused and compressed to form a tubular filter element.
Claim 6
Dependent Claim
18 words
The coreless filter element of claim 3, wherein the first and second nonwoven fabric strips have differing porosities.
Claim 7
Dependent Claim
24 words
The coreless filter element of claim 4, wherein the filter element is comprised of three or more overlapped bands of multi-overlapped nonwoven fabric strips.
Claim 8
Dependent Claim
298 words
A coreless filter element comprising: a nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder material thermally fused and compressed to form a first nonwoven fabric strip of selected porosity; the binder material having at least a surface with a melting temperature lower than that of the base fiber, the base fiber and the binder material being thermally fused at a temperature to melt at least the surface of the binder material to bind the base fibers, when the fabric is cooled, into the first nonwoven fabric strip; the first nonwoven fabric strip being spirally wound upon itself in multiple overlapping layers to form a first band having a selected radial thickness and an axial length; at least a second nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder fiber thermally fused and compressed to form a second nonwoven fabric strip of selected porosity; the binder material of the second nonwoven fabric having at least a surface with a melting temperature lower than that of the base fiber, the base fiber and the binder material being thermally fused at a temperature to melt at least the surface of the binder material to bind the base fibers, when the fabric is cooled, into the second nonwoven fabric strip; the second fabric strip being spirally wound upon itself in multiple overlapping layers to form a second band having a selected radial thickness; the second fabric strip being overlapped along at least a portion of the axial length of the first fabric strip and again fused at a temperature to melt at least a surface of the binder material in the nonwoven fabric strips to bind the base fibers of the first and second bands into a porous, self-supporting filter element.
Claim 9
Dependent Claim
298 words
A coreless filter element comprising: a nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder material thermally fused and compressed to form a first nonwoven fabric strip of selected porosity; the binder material having at least a surface with a melting temperature lower than that of the base fiber, the base fiber and the binder material being thermally fused at a temperature to melt at least the surface of the binder material to bind the base fibers, when the fabric is cooled, into the first nonwoven fabric strip; the first nonwoven fabric strip being spirally wound upon itself in multiple overlapping layers to form a first band having a selected radial thickness and an axial length; at least a second nonwoven fabric comprising a substantially homogeneous mixture of a base fiber and a binder fiber thermally fused and compressed to form a second nonwoven fabric strip of selected porosity; the binder material of the second nonwoven fabric having at least a surface with a melting temperature lower than that of the base fiber, the base fiber and the binder material being thermally fused at a temperature to melt at least the surface of the binder material to bind the base fibers, when the fabric is cooled, into the second nonwoven fabric strip; the second fabric strip being spirally wound upon itself in multiple overlapping layers to form a second band having a selected radial thickness; the second fabric strip being overlapped along at least a portion of the axial length of the first fabric strip and again fused at a temperature to melt at least a surface of the binder material in the nonwoven fabric strips to bind the base fibers of the first and second bands into a porous, self-supporting filter element.
Claim 10
Dependent Claim
29 words
The coreless filter element of claim 6, wherein the first and second nonwoven fabric strips are helically wound and thermally fused and compressed to form a tubular filter element.
Claim 11
Dependent Claim
18 words
The coreless filter element of claim 7, wherein the first and second nonwoven fabric strips have differing porosities.
Claim 12
Dependent Claim
24 words
The coreless filter element of claim 8, wherein the filter element is comprised of three or more overlapped bands of multi-overlapped nonwoven fabric strips.
Claim 13
Dependent Claim
24 words
The coreless filter element of claim 9, wherein each band includes at least three overlapped layers which give the band the selected radial thickness.
Claim 14
Dependent Claim
17 words
The coreless filter element of claim 10, wherein each band includes five overlapped layers which give the
References Cited (Backward Citations)
US2744294A
Cited
US2703441A
Cited
US2890497A
Cited
US3225848A
Cited
US3399092A
Cited
US3755028A
Cited
DE1950068A1
Cited
DE2005938A1
Cited
US3768119A
Cited
US3744092A
Cited
US3766607A
Cited
US3910703A
Cited
US3920428A
Cited
DE2531401A1
Cited
GB1538902A
Cited
US4101423A
Cited
US4475973A
Cited
US4398931A
Cited
US4986909A
Cited
US4586760A
Cited
DE3513062A1
Cited
DE3522725A1
Cited
US4944996A
Cited
FR2582956A1
Cited
US4838905A
Cited
US4839037A
Cited
US4792397A
Cited
US4902417A
Cited
US5273818A
Cited
US4961974A
Cited
US5120331A
Cited
US5141643A
Cited
US5096591A
Cited
US5232595A
Cited
US5264162A
Cited
US5393601A
Cited
US5114582A
Cited
US5271850A
Cited
US5409515A
Cited
US5424907A
Cited
US5230726A
Cited
US5304312A
Cited
US5266195A
Cited
US5298046A
Cited
US5503745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-10-26 | 2002-04-27 | 2002-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-26 | 2006-04-27 | 2006-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-26 | 2010-04-27 | 2010-10-27 | $7700.00 | Window Closed / Lapsed |