Patent US3780872A successfully refreshed from Google Patents.
US3780872A
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Filters comprising anisometric compressed and bonded multilayer knitted wire mesh composites
Assignee: Pall Corp
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Filing: 1970-09-29
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Granted: 1973-12-25
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Expires: 1990-09-29
Abstract
Abstract Filters and filter units are provided which comprise as the filter sheet anisometric compressed and bonded knitted wire mesh composites composed of a plurality of sheets of knitted wire mesh, superimposed at random orientation with respect to each other, compressed or densified to a voids volume within the range from about 10 to about 90 percent, and bonded together. The sheets are taken in sufficient number, usually at least five and preferably ten or more, and as much as 1,000 or more, to form a self-supporting relatively non-resilient composite of high tensile strength and high breaking strength having an average pore diameter of less than 200 microns, and preferably less than 100 microns, that is relatively uniform in any unit area of the surface, and having an anisometric porosity, the through pores extending crosswise of the sheet greatly exceeding in number the through pores extending laterally of the sheet, which latter pores can be reduced virtually to zero in a highly compressed composite. The composite is formed by superimposing a plurality of knitted wire mesh sheets, annealing the composite to avoid wire breakage during later processing, compressing the composite to the desired density and anisometricity by application of pressure in a direction approximately perpendicular to the plane of the layers of the composite, and bonding the sheet layers and wire filaments of the sheets together at their points of contact and/or crossing. The bonding holds the composite at the selected density, prevents relative movement of the wires in the composite, and in conjunction with the multilayer structure imparts the self-supporting nonresilient characteristic, together with high tensile strength and high breaking strength.
Inventors
- 👤 D Pall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:17
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/46; B07B1/4609; B07B1/4663; B01; B01D; B01D39/00; B01D39/10; B01D39/12; B07B1/4672; F; F16; F16L; F16L55/00; F16L55/02; F16L55/033; F16L55/0336
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
133 words
A filter element comprising, in combination, a porous fluidpermeable anisometric knitted wire mesh composite of integrated multilayer structure capable of removing small particles from fluids comprising a plurality of layers of knitted wire mesh, compressed substantially throughout its surface area to a maximum pore diameter below about 200 microns, and having the wires lying almost entirely in planes approximately parallel to the plane of the composite, having an anisometric porosity, and a voids volume of at least 10 percent, the wires at the interface of the interior layers being intermingled and interlocked with each other substantially throughout by such compression, and the wires and the layers being bonded together at their points of contact, formed in a cylinder having two open ends and an end cap closing off each of the open ends.
Claim 2
Dependent Claim
133 words
A filter element comprising, in combination, a porous fluidpermeable anisometric knitted wire mesh composite of integrated multilayer structure capable of removing small particles from fluids comprising a plurality of layers of knitted wire mesh, compressed substantially throughout its surface area to a maximum pore diameter below about 200 microns, and having the wires lying almost entirely in planes approximately parallel to the plane of the composite, having an anisometric porosity, and a voids volume of at least 10 percent, the wires at the interface of the interior layers being intermingled and interlocked with each other substantially throughout by such compression, and the wires and the layers being bonded together at their points of contact, formed in a cylinder having two open ends and an end cap closing off each of the open ends.
Claim 3
Dependent Claim
27 words
A filter element as in claim 1 having an anisometric metallic filter sheet material whose thickness is within the range from about 0.001 to about 0.5 inch.
Claim 4
Dependent Claim
27 words
A filter element in claim 1, wherein the wires within each layer and at the interface of the layers of the filter sheet material are sinterbonded together.
Claim 5
Dependent Claim
20 words
A filter element as in claim 1, wherein said layers of the filter sheet material are of weft-type knitted mesh.
Claim 6
Dependent Claim
20 words
A filter element as in claim 1, wherein said layers of the filter sheet material are of warp-type knitted mesh.
Claim 7
Dependent Claim
22 words
A filter element as in claim 1, wherein the layers are of knitted mesh having less than thirty needle ends per inch.
Claim 8
Dependent Claim
12 words
A filter element as in claim 1, made of stainless steel wire.
Claim 9
Dependent Claim
22 words
A filter element as in claim 1, in which there are at least five layers of knitted wire mesh in one composite.
Claim 10
Dependent Claim
36 words
A filter element as in claim 1, wherein the wires of the filter sheet material are deformed at their points of crossing, so as to have a lesser height and a greater width at those points.
Claim 11
Dependent Claim
21 words
A filter element as in claim 1, having the wires of the filter sheet material sinter-bonded at their points of crossing.
Claim 12
Dependent Claim
116 words
A corrugated filter element comprising a porous fluid-permeable anisometric knitted wire mesh composite of integrated multilayer structure capable of removing small particles from fluids comprising a plurality of layers of knitted wire mesh, compressed substantially throughout its surface area to a maximum pore diameter below about 200 microns, and having the wires lying almost entirely in planes approximately parallel to the plane of the composite, having an anisometric porosity and a voids volume of at least 10 percent, the wires at the interface of the interior layers being intermingled and interlocked with each other substantially throughout by such compression, and the wires and the layers being bonded together at their points of contact, in corrugated form.
Claim 13
Dependent Claim
116 words
A corrugated filter element comprising a porous fluid-permeable anisometric knitted wire mesh composite of integrated multilayer structure capable of removing small particles from fluids comprising a plurality of layers of knitted wire mesh, compressed substantially throughout its surface area to a maximum pore diameter below about 200 microns, and having the wires lying almost entirely in planes approximately parallel to the plane of the composite, having an anisometric porosity and a voids volume of at least 10 percent, the wires at the interface of the interior layers being intermingled and interlocked with each other substantially throughout by such compression, and the wires and the layers being bonded together at their points of contact, in corrugated form.
Claim 14
Dependent Claim
145 words
A filter unit comprising, in combination, a housing, a fluid inlet and a fluid outlet therein, and, disposed across the line of flow between the inlet and the outlet in a manner to intercept fluid flowing therebetween, a porous fluid-permeable anisometric knitted wire mesh composite of integrated multilayer structure capable of removing samll particles from fluids comprising a plurality of layers of knitted wire mesh, compressed substantially throughout its surface area to a maximum pore diameter below about 200 microns, and having the wires lying almost entirely in planes approximately parallel to the plane of the composite, having an anisometric porosity and a voids volume of at least 10 percent, the wires at the interface of the interior layers being intermingled and interlocked with each other substantially throughout by such compression, and the wires and the layers being bonded together at their points of contact.
Claim 15
Dependent Claim
145 words
A filter unit comprising, in combination, a housing, a fluid inlet and a fluid outlet therein, and, disposed across the line of flow between the inlet and the outlet in a manner to intercept fluid flowing therebetween, a porous fluid-permeable anisometric knitted wire mesh composite of integrated multilayer structure capable of removing samll particles from fluids comprising a plurality of layers of knitted wire mesh, compressed substantially throughout its surface area to a maximum pore diameter below about 200 microns, and having the wires lying almost entirely in planes approximately parallel to the plane of the composite, having an anisometric porosity and a voids volume of at least 10 percent, the wires at the interface of the interior layers being intermingled and interlocked with each other substantially throughout by such compression, and the wires and the layers being bonded together at their points of contact.
Claim 16
Dependent Claim
23 words
A filter unit in accordance with claim 12, wherein the wires of the metallic filter sheet are sinter-bonded at their points of contact.
Claim 17
Dependent Claim
27 words
A filter element as in claim 12 having an anisometric metallic filter sheet material whose thickness is within the range from about 0.001 to about 0.5 inch.
Claim 18
Dependent Claim
28 words
A filter element as in claim 12, wherein the wires within each layer and at the interface of the layers of the filter sheet material are sinter-bonded together.
Claim 19
Dependent Claim
20 words
A filter element as in claim 12, wherein said layers of the filter sheet material are of weft-type knitted mesh.
Claim 20
Dependent Claim
20 words
A filter element as in claim 12, wherein said layers of the filter sheet material are of warp-type knitted mesh.
Claim 21
Dependent Claim
22 words
A filter element as in claim 12, wherein the layers are of knitted mesh having less than thirty needle ends per inch.
Claim 22
Dependent Claim
12 words
A filter element as in claim 12, made of stainless steel wire.
Claim 23
Dependent Claim
22 words
A filter element as in claim 12, in which there are at least five layers of knitted wire mesh in one composite.
Claim 24
Dependent Claim
36 words
A filter element as in claim 12, wherein the wires of the filter sheet material are deformed at their points of crossing, so as to have a lesser height and a greater width at those points.
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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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |