# US 2018/0021709 A1 · Filtration filter and filtration filter device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0021709 A1 - Document ID: US20180021709A1 - Status: Published application - Kind: A1 - Application number: 15/719,911 - Filed: 2017-09-29 - Published: 2018-01-25 - Earliest claimed: 2016-02-15 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Wataru Yamamoto; Takashi Kondo; Masaru Banju - Web page: https://patentgrep.com/patent/US20180021709A1 ## CPC - B01D 39/10: Filter screens essentially made of metal - B01D 29/012: {Making filtering elements (making bag, cage, hose, tube, sleeve or like filtering elements B01D29/111)} - B01D 29/05: supported - B01D 35/30: Filter housing constructions - B01D 2201/184: Special form, dimension of the openings, pores of the filtering elements - 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 filtration filter includes a porous metal film that filters out a filtration object contained in a fluid, and a support base member that is disposed on at least one main surface of the porous metal film and that supports the porous metal film. The support base member has an opening that exposes a part of the porous metal film. An inner peripheral surface of the opening has undulations formed along its periphery. ## Claims ### Claim 1 A filtration filter, comprising: a porous metal film for filtering out a filtration object contained in a fluid; and a support base member disposed on at least one main surface of the porous metal film, the support base member supporting the porous metal film, the support base member having an opening that exposes a part of the porous metal film, an inner peripheral surface of the opening being undulated. ### Claim 2 (depends on 1) The filtration filter according to claim 1, wherein the undulations are formed at least in a portion of the support base member that is in contact with the porous metal film. ### Claim 3 (depends on 1) The filtration filter according to claim 1, wherein: the porous metal film lies in a plane; the undulations have ridges and troughs that are alternately arranged, and the ridges and the troughs extend in a direction to the plane in which the porous metal film lies. ### Claim 4 (depends on 3) The filtration filter according to claim 3, wherein pitches of the ridges and the troughs are each smaller than an average particle size of the filtration object. ### Claim 5 (depends on 3) The filtration filter according to claim 3, wherein pitches of the ridges and the troughs are each smaller than or equal to a pitch of through-holes that are formed in the porous metal film to filter out the filtration object. ### Claim 6 (depends on 3) The filtration filter according to claim 3, wherein the troughs are located at positions corresponding to though-holes that are formed in the porous metal film to filter out the filtration object. ### Claim 7 (depends on 1) A filtration filter device comprising: the filtration filter according to claim 1; and a housing in which the filtration filter is disposed, the housing having a fluid inlet path that faces one main surface of the filtration filter and a fluid outlet path that faces the other main surface of the filtration filter. ### Claim 8 A method for forming a filtration filter, comprising: forming a porous metal film, and forming a support base on at least one main surface of the porous metal film such that the support base member has an opening that exposes part of the porous metal film, an inner peripheral surface of the opening being undulated. ### Claim 9 (depends on 8) A method for forming a filtration filter according to claim 8, wherein the undulations are formed at least in a portion of the support base member that is in contact with the porous metal film. ### Claim 10 (depends on 8) A method for forming a filtration filter according to claim 8, wherein the undulations include ridges and troughs that are alternately arranged and extend in a direction perpendicular to a plane in which the porous metal film lies. ### Claim 11 (depends on 10) A method for forming a filtration filter according to claim 10, wherein the pitches of the ridges and the troughs are each preferably smaller than an average particle size of the filtration object. ### Claim 12 (depends on 10) A method for forming a filtration filter according to claim 10, wherein the pitches of the ridges and the troughs are each preferably smaller than or equal to a pitch of through-holes that are formed in the porous metal film to filter out the filtration object. ### Claim 13 (depends on 10) A method for forming a filtration filter according to claim 10, wherein the troughs are preferably located at positions corresponding to though-holes that are formed in the porous metal film to filter out the filtration object. ### Claim 14 (depends on 1) A method of filtering a filtration object contained in a fluid, the method comprising passing the fluid trough a filter having the structure of claim 1. ### Claim 15 (depends on 2) A method of filtering a filtration object contained in a fluid, the method comprising passing the fluid trough a filter having the structure of claim 2. ### Claim 16 (depends on 3) A method of filtering a filtration object contained in a fluid, the method comprising passing the fluid trough a filter having the structure of claim 3. ### Claim 17 (depends on 4) A method of filtering a filtration object contained in a fluid, the method comprising passing the fluid trough a filter having the structure of claim 4. ### Claim 18 (depends on 5) A method of filtering a filtration object contained in a fluid, the method comprising passing the fluid trough a filter having the structure of claim 5. ### Claim 19 (depends on 6) A method of filtering a filtration object contained in a fluid, the method comprising passing the fluid trough a filter having the structure of claim 6.