# US 2018/0021737 A1 · Filtration filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0021737 A1 - Document ID: US20180021737A1 - Status: Published application - Kind: A1 - Application number: 15/719,942 - Filed: 2017-09-29 - Published: 2018-01-25 - Earliest claimed: 2015-12-14 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: MASARU BANJU; Takashi Kondo; Junko Watanabe - Web page: https://patentgrep.com/patent/US20180021737A1 ## CPC - B01D 71/02: Inorganic material - B01D 29/01: with flat filtering elements (B01D29/39 takes precedence) - B01D 46/0004: {Details of removable closures, lids, caps or filter heads} - B01D 46/0005: {Mounting of filtering elements within casings, housings or frames (B01D46/2422 takes precedence)} - B01D 63/087: {Single membrane modules} - B01D 65/003: {Membrane bonding or sealing} - B01D 69/02: characterised by their properties - B01D 69/10: Supported membranes; Membrane supports - B01D 71/0221: {Group 4 or 5 metals} - B01D 71/02231: {Palladium} - B01D 71/02232: {Nickel} - C12M 1/12: with sterilisation, filtration or dialysis means - B01D 29/03: self-supporting - B01D 29/05: supported - B01D 2313/025: Specific membrane holders - B01D 2313/20: Specific housing - B01D 2315/10: Cross-flow filtration - B01D 2315/20: Operation control schemes defined by a periodically repeated sequence comprising filtration cycles combined with cleaning or gas supply, e.g. aeration - B01D 2325/04: Characteristic thickness - C12M 29/18: {External loop; Means for reintroduction of fermented biomass or liquid percolate (loop type reactors for chemical or physical processes B01J19/2435)} - C12M 33/14: {with filters, sieves or membranes} - C12M 47/02: {Separating microorganisms from the culture medium; Concentration of biomass (separating microorganisms from their culture media C12N1/02)} - 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) - C12M: APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; {APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS} ## Abstract A filtration filter is suitable for performing cross-flow filtration by using a metallic porous membrane. A metallic porous membrane has a membrane portion for filtering filtration objects contained in a fluid and a held portion provided at its outer periphery. A first frame member and a second frame member hold the held portion of the metallic porous membrane there between. The held portion has a bent portion bent to a second principal surface side opposing a first principal surface of the membrane portion. The first frame member is in contact with the held portion at the first principal surface side of the metallic porous membrane. The second frame member is disposed at an inner side portion of the first frame member and is in contact with the held portion at the second principal surface side of the metallic porous membrane. ## Claims ### Claim 1 A filtration filter, comprising: a metallic porous membrane having a center and including: upper and lower opposed main surfaces; an inner membrane portion for filtering objects contained in a fluid, the inner membrane portion extending outwardly from the center of the metallic porous membrane and lying in a plane; and a held portion extending outwardly from an outer periphery of the inner membrane portion; a lower frame having a first edge; and an upper frame having a second edge which is located inward of and below the first edge of the lower frame, the held portion being bent around the first and second edges in a zig zag manner. ### Claim 2 (depends on 1) The filtration filter of claim 1, wherein the first edge is formed between first and second surfaces of the lower frame and the second edge is formed between first and second surfaces of the upper frame. ### Claim 3 (depends on 2) The filtration filter of claim 2, wherein: the first surfaces of the upper and lower frames lie parallel to the upper and lower surfaces of the metallic porous membrane; the upper surface of the metallic porous member extends along the first surface of the upper frame; and the lower surface of the metallic porous member extends along the first surface of the lower frame. ### Claim 4 (depends on 3) The filtration filter of claim 3, wherein the upper frame does not contact the lower surface of the metallic porous member. ### Claim 5 (depends on 2) The filtration filter of claim 2, wherein the first surface of the upper frame contacts a portion of the upper surface of the metallic porous member corresponding to the held portion but does not contact the portion of the upper surface of the metallic porous member corresponding to the inner membrane portion. ### Claim 6 (depends on 3) The filtration filter of claim 3, wherein the upper frame further includes a third surface extending parallel to its first surface, the second surface of the upper frame facing the second surface of the lower frame with the held portion extending there between, the third surface of the upper frame facing the first surface of the lower frame with the held portion extending there between. ### Claim 7 (depends on 6) The filtration filter of claim 6, wherein the distance between the second surface of the upper frame and the second surface of the lower frame as measured in a direction parallel to the plane of the membrane portion is greater than the distance between the third surface of the upper frame and the first surface of the lower frame a measured in a direction perpendicular to the plane of the membrane portion. ### Claim 8 A filtration filter, comprising: a metallic porous membrane having a center and including: upper and lower opposed main surfaces; an inner membrane portion for filtering objects contained in a fluid, the inner membrane portion extending outwardly from the center of the metallic porous membrane and lying in a plane; and a held portion extending outwardly from an outer periphery of the inner membrane portion; a lower frame having first and second edges; and an upper frame having first and second edges, the first edge of the upper frame being located inward of and below the first edge of the lower frame, the second edge of the upper frame being located outwardly of and above the first edge of the lower frame, the second edge of the lower frame being located outward of and above the second edge of the upper frame, the held portion being bent around the first, second, third and fourth edges in a zig zag manner. ### Claim 9 (depends on 8) The filtration filter of claim 8, wherein the first edge is formed between first and second surfaces of the lower frame and the second edge is formed between first and second surfaces of the upper frame. ### Claim 10 (depends on 9) The filtration filter of claim 9, wherein: the first surfaces of the upper and lower frames lie parallel to the upper and lower surfaces of the metallic porous membrane; the upper surface of the metallic porous member extends along the first second surface of the upper frame; and the lower surface of the metallic porous member extends along the first second surface of the lower frame. ### Claim 11 (depends on 9) The filtration filter of claim 9, wherein the upper frame does not contact the lower surface of the metallic porous member. ### Claim 12 (depends on 9) The filtration filter of claim 9, wherein the first surface of the upper frame contacts a portion of the upper surface of the metallic porous member corresponding to the held portion but does not contact the portion of the upper surface of the metallic porous member corresponding to the inner membrane portion. ### Claim 13 (depends on 10) The filtration filter of claim 10, wherein the upper frame further includes a third surface extending parallel to its first surface, the second surface of the upper frame facing the second surface of the lower frame with the held portion extending there between, the third surface of the upper frame facing the first surface of the lower frame with the held portion extending there between. ### Claim 14 (depends on 113) The filtration filter of claim 113, wherein the distance between the second surface of the upper frame and the first surface of the lower frame as measured in a direction parallel to the plane of the membrane portion is greater than the distance between the third surface of the upper frame and the second surface of the lower frame a measured in a direction perpendicular to the plane of the membrane portion.