# US 9,039,800 B2 · Filter for a fluid-conducting pipe > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,039,800 B2 - Document ID: US9039800B2 - Status: Granted - Kind: B2 - Application number: 13/955,629 - Filed: 2013-07-31 - Published: 2014-02-20 - Granted: 2015-05-26 - Earliest claimed: 2012-08-16 - Assignees: Witzenmann GmbH - Applicants: Witzenmann GmbH - Inventors: Fabian Elsasser; Thomas Kunzmann; Sebastian Reuss - Web page: https://patentgrep.com/patent/US9039800B2 ## CPC - B01D 39/20: of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires (porous ceramic material {C04B38/00} ; sintering metals C22C1/04; {making porous sintered metal bodies B22F3/10, honeycomb filters B01D46/2418, materials used for filtering exhaust gases of an internal combustion engine F01N3/022, ceramic honeycomb structures C04B38/0006}) - B01D 39/10: Filter screens essentially made of metal - B01D 39/12: of wire gauze; of knitted wire; of expanded metal - B01D 39/2017: {the material being filamentary or fibrous} - B01D 39/2041: {the material being filamentary or fibrous} - B01D 46/0005: {Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence)} - B01D 46/10: Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces - B01D 46/103: {Curved filtering elements} - B01D 46/522: {with specific folds, e.g. having different lengths} - B01D 2275/50: Stabilised filter material, stabilised by, e.g. structuring, calendering - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract A filter for a fluid-conducting pipe, in particular for a gas-conducting pipe of an internal combustion engine. The filter includes a self-supporting areal filter element and is fixable along a circumference 2 directly or indirectly in the pipe and, in so doing, covers a free cross section of the pipe. Here, the circumference 2 of the filter element 1 circumscribes a central filter plane 4. Furthermore, the filter element 1 or at least one layer thereof is comprised of a plastically deformable material and is provided with at least one undulation 5 or bead 13, which does not intersect the circumference 2, in such a way that the filter element 1 intersects the filter plane 4, or a plane 4a parallel thereto, at least four times within the circumference 2. ## Claims ### Claim 1 A filter arrangement, comprising a self-supporting areal filter element (1), a carrier pipe, and a sleeve, the filter element having a circumference (2) adapted to be fixed directly or indirectly to the carrier pipe to cover a free cross section of the carrier pipe, the circumference (2) of the filter element (1) circumscribes a central filter plane (4), the filter element (1) comprises at least one layer formed of a plastically deformable material and is provided with at least one undulation (5) or bead (13), which does not intersect the circumference (2), such that the filter element (1) intersects the filter plane (4), or a plane (4a) parallel thereto, at least four times within the circumference (2), the filter element (1) is fixed to the carrier pipe (8) and covers a clear internal cross section thereof, the filter element (1) is, at the circumference (2) thereof, bent to form a circumferential region running parallel to an outer wall of the carrier pipe (8), and the sleeve (10) clamps the circumferential region between itself and the carrier pipe (8). ### Claim 2 (depends on 1) The filter arrangement as claimed in claim 1, wherein the at least one undulation (5) or bead (13) extends substantially along a curve parallel with respect to the circumference (2). ### Claim 3 (depends on 1) The filter arrangement as claimed in claim 1, wherein the at least one undulation (5) or bead (13) is comprised of multiple partial segments spaced apart from one another. ### Claim 4 (depends on 1) The filter arrangement as claimed in claim 1, wherein the at least one undulation (5) or bead (13) is of rotationally symmetrical or point-symmetrical form. ### Claim 5 (depends on 1) The filter arrangement as claimed in claim 1, wherein the filter element (1) has multiple concentric undulations (5) or beads (13) with identical or different heights, and centrally, has a flattening or spherical-cap-shaped elevation or depression (14). ### Claim 6 (depends on 1) The filter arrangement as claimed in claim 1, wherein the at least one layer is comprised of heat-resistant high-grade steel. ### Claim 7 (depends on 6) The filter arrangement as claimed in claim 6, wherein the steel is an austenitic high-grade steel. ### Claim 8 (depends on 1) The filter arrangement as claimed in claim 1, wherein the at least one layer is comprised of at least one of a fabric, a fine fabric, a knitted fabric, a fabric with rectangular meshes or square meshes, a knit, a sintered fabric, or of a braided fabric with a filter fineness of at least 500 μm. ### Claim 9 (depends on 8) The filter arrangement as claimed in claim 8, wherein the at least one layer is produced from metal wires which have different wire thicknesses. ### Claim 10 (depends on 9) The filter arrangement as claimed in claim 9, wherein the metal wires include interwoven warp wires and weft wires, and the warp wires are formed so as to be thicker than the weft wires. ### Claim 11 (depends on 1) The filter arrangement as claimed in claim 1, wherein the filter element (1), in the installed state and at a temperature of up to 650° C. withstands a differential pressure without permanent deformation. ### Claim 12 (depends on 1) The filter arrangement as claimed in claim 1, wherein the filter element (1), in the installed state, withstands a maximum force of at least 100 N acting perpendicular to the filter plane (4) over at least two thirds of an overall area of the filter element (1), without rupturing. ### Claim 13 (depends on 1) The filter arrangement as claimed in claim 1, wherein the filter element (1) is compressed between the sleeve (10) and the carrier pipe (8). ### Claim 14 (depends on 13) The filter arrangement as claimed in claim 13, wherein the carrier pipe (8) and the sleeve (10) are provided with at least one aligned outflow opening (11, 12) which is covered by the filter element (1). ### Claim 15 (depends on 1) The filter arrangement as claimed in claim 1, wherein the filter element (1) is provided with an undulation (5) which runs along the circumference (2) and which, within said undulation, has a conical elevation or a spherical cap or a flat base.