# US 12,766,768 B2 · Filter media and related foam forming methods > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,766,768 B2 - Document ID: US12766768B2 - Status: Granted - Kind: B2 - Application number: 18/326,932 - Filed: 2023-05-31 - Published: 2024-12-05 - Granted: 2026-10-20 - Earliest claimed: 2023-05-31 - Assignees: Hollingsworth & Vose Company - Applicants: Hollingsworth & Vose Company - Inventors: Thomas Petri; Julia Anuscha Kronawitt; Michael Arnulf Hermann Neukirch - Web page: https://patentgrep.com/patent/US12766768B2 ## CPC - B29C 44/28: Expanding the moulding material on continuous moving surfaces {without restricting the upwards growth of the foam} - B01D 39/1607: {the material being fibrous (B01D39/18 takes precedence)} - B01D 39/1676: {of synthetic origin} - B29C 44/32: Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements - B29L 2031/14: Filters {(optical filters B29L2011/0066, sieves or screens B29L2031/737)} - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - 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) - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES ## Abstract Filter media and related methods of foam forming the filter media are generally described herein. ## Claims ### Claim 1 A filter media, comprising: a fiber web comprising a plurality of pores, wherein the filter media has a pore permeability index (PPI) of greater than or equal to 0.2 and less than or equal to 4.0, and wherein greater than or equal to 15% of pores of the plurality of pores have an average size of less than or equal to 1 micrometer. ### Claim 2 (depends on 1) The filter media of claim 1, wherein the PPI of the filter media is greater than or equal to 0.3 and less than or equal to 3.5. ### Claim 3 (depends on 1) The filter media of claim 1, wherein greater than or equal to 20% of the pores of the plurality of pores have the average size of less than or equal to 1 micrometer. ### Claim 4 (depends on 1) The filter media of claim 1, wherein less than or equal to 50% of the pores of the plurality of pores have the average size of less than or equal to 1 micrometer. ### Claim 5 (depends on 1) The filter media of claim 1, wherein the fiber web is a non-woven fiber web. ### Claim 6 (depends on 1) The filter media of claim 1, wherein the fiber web comprises cellulose fibers, nanocellulose fibers, microfibrillated cellulose fibrils, synthetic fibers, glass fibers, lyocell fibers, polyvinyl alcohol fibers, bicomponent fibers, tricomponent fibers, and/or combinations thereof. ### Claim 7 (depends on 1) The filter media of claim 1, wherein the fiber web comprises one or more binders. ### Claim 8 (depends on 7) The filter media of claim 7, wherein the one or more binders comprise an acrylic, phenolic, melamine, epoxy, polyester, and/or particle binder. ### Claim 9 (depends on 1) The filter media of claim 1, wherein the filter media has a specific dust holding capacity (DHC) of greater than or equal to 10 g/m2 and less than or equal to 1000 g/m2. ### Claim 10 (depends on 1) The filter media of claim 1, wherein the filter media has a gas/liquid separation performance of less than or equal to 10 mg/m3 liquid. ### Claim 11 (depends on 1) The filter media of claim 1, wherein the filter media has a fuel/water separation performance of greater than or equal to 5% water retention. ### Claim 12 (depends on 1) The filter media of claim 1, wherein the filter media has an air permeability of greater than or equal to 1 l/m2s and less than or equal to 5000 l/m2s. ### Claim 13 (depends on 12) The filter media of claim 12, wherein the air permeability of the filter media is greater than or equal to 1.5 l/m2s and less than or equal to 3500 l/m2s. ### Claim 14 (depends on 1) The filter media of claim 1, wherein the filter media has a thickness of greater than or equal to 0.1 mm and less than or equal to 3 mm. ### Claim 15 (depends on 1) The filter media of claim 1, wherein the filter media is a gas and/or a liquid filtration and/or separation media. ### Claim 16 (depends on 1) The filter media of claim 1, wherein greater than or equal to 30% of the pores of the plurality of pores have the average size of less than or equal to 1 micrometer. ### Claim 17 (depends on 1) The filter media of claim 1, wherein the filter media has a dust holding capacity (DHC) of greater than or equal to 50 g/m2 as measured by ISO 19438. ### Claim 18 (depends on 1) The filter media of claim 1, wherein the filter media has a dust holding capacity (DHC) of greater than or equal to 50 g/m2 as measured by ISO 16889. ### Claim 19 (depends on 1) The filter media of claim 1, wherein the filter media has a specific dust holding capacity (DHC) of greater than or equal to 50 g/m2 as measured by ISO 5011. ### Claim 20 (depends on 1) The filter media of claim 1, wherein the filter media has a specific dust holding capacity (DHC) of greater than or equal to 50 g/m2 as measured by ISO 4020. ### Claim 21 (depends on 1) The filter media of claim 1, wherein the filter media is fabricated according to a foam forming process, and wherein the filter media has a dust holding capacity (DHC) value that is at least 10% greater than a filter media that is essentially identical in composition but fabricated according to a wetlaid process.