# US 2014/0197094 A1 · Filter medium and breather filter structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197094 A1 - Document ID: US20140197094A1 - Status: Published application - Kind: A1 - Application number: 14/134,604 - Filed: 2013-12-19 - Published: 2014-07-17 - Earliest claimed: 2004-11-05 - Assignees: Donaldson Company, Inc. - Applicants: Donaldson Company, Inc. - Inventors: Robert M. Rogers; Keh B. Dema - Web page: https://patentgrep.com/patent/US20140197094A1 ## CPC - B01D 39/163: {sintered or bonded} - B01D 39/1615: {of natural origin} - B01D 39/18: the material being cellulose or derivatives thereof ({cork or peat B01D39/1646} ; making filter paper D21F11/14) - B01D 39/2017: {the material being filamentary or fibrous} - B01D 39/2024: {otherwise bonded, e.g. by resins} - B01D 39/2037: {otherwise bonded} - B01D 46/10: Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces - B01D 46/2411: {Filter cartridges} - B01D 46/521: {using folded, pleated material} - B01D 46/71: with pressurised gas, e.g. pulsed air - B01D 2239/0216: Bicomponent or multicomponent fibres - B01D 2239/065: More than one layer present in the filtering material - B01D 2239/0668: The layers being joined by heat or melt-bonding - B01D 2275/10: Multiple layers - B01D 2279/60: for the intake of internal combustion engines or turbines - Y10T 442/616: Blend of synthetic polymeric and inorganic microfibers - Y10T 442/622: Microfiber is a composite fiber - Y10T 442/623: Microfiber is glass - Y10T 442/637: Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material - 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) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Thermoplastic bicomponent binder fiber can be combined with other media, fibers and other filtration components to form a thermally bonded filtration media. The filtration media can be used in filter units, such as breather caps. Such filter units can be placed in the stream of a mobile fluid and can remove a particulate and/or fluid mist load from the mobile stream. The unique combination of media fiber, bicomponent binder fiber and other filtration additives and components provide a filtration media having unique properties in filtration applications. ## Claims ### Claim at position 1 1-13. (canceled) ### Claim 14 A wet laid layer comprising a thermally bonded sheet, the sheet comprising: (a) about 10 to 90 wt % of a bicomponent fiber; and (b) an effective amount of a second fiber to obtain a pore size of about 0.5 to 100 micrometers, a permeability of about 5 to 500 ft-min.−1, a thickness of about 0.2 to 50 mm, a solidity of about 2 to 25%, a basis weight of about 10 to 1000 g-m−2. ### Claim 15 A nonwoven filtration medium comprising: a loading layer having an average pore size of 5 to 30 micrometers, wherein the loading layer comprises bicomponent fibers and glass fibers, wherein the bicomponent fibers have a concentric sheath-core structure; and an efficiency layer having an average pore size of 0.5 to 3 micrometers. ### Claim 16 (depends on 15) The nonwoven filtration medium of claim 15 wherein the efficiency layer has a permeability of 5 to 30 ft-min−1 and the loading layer has a permeability of 50 to 200 ft-min−1. ### Claim 17 (depends on 15) The nonwoven filtration medium of claim 15 further comprising a fluoro-organic compound. ### Claim 18 A multilayer nonwoven filtration medium comprising: a loading layer having an average pore size of 5 to 30 micrometers; and an efficiency layer having an average pore size of 0.5 to 3 micrometers; wherein one or more layers comprise bicomponent binder fibers and glass fibers. ### Claim 19 (depends on 18) The multilayer nonwoven filtration medium of claim 18 which has a permeability of 4 to 20 ft-min−1, a wet burst strength of 10 lb-in−2 to 20 lb-in−2, and a basis weight of 100 g-m−2 to 200 g-m−2. ### Claim 20 (depends on 18) The multilayer nonwoven filtration medium of claim 18 further comprising a fluoro-organic compound. ### Claim 21 A nonwoven filtration medium comprising: bicomponent binder fibers having a fiber diameter of 5 to 50 micrometers; glass fibers having a fiber diameter of 0.1 to 30 micrometers; and monocomponent fibers. ### Claim 22 (depends on 21) The nonwoven filtration medium of claim 21 which has a solidity of 1 to 25%, a basis weight of 2 to 1000 g-m−2, a pore size of 0.2 to 100 micrometers, and a permeability of 2 to 500 ft-min−1. ### Claim 23 (depends on 21) The nonwoven filtration medium of claim 21 further comprising a fluoro-organic compound. ### Claim 24 A filtration medium comprising a thermally bonded sheet, the sheet comprising: about 20 to 80 wt % of a bicomponent binder fiber having a fiber diameter of about 5 to 50 micrometers; and an effective amount of glass fiber blended with the bicomponent binder fiber; wherein glass fiber is selected from the sources comprising an average fiber diameter of about 0.1 to 1 micrometer, 0.3 to 2 micrometers, 0.5 to 5 micrometers, 0.75 to 7 micrometers, 1 to 10 micrometers, 3 to 30 micrometers in a combination of two or more sources thereof, and in that said selected sources include the source which comprises an average fiber diameter of 3 to 30 micrometers. ### Claim 25 A filtration medium in the form of a thermally bonded nonwoven structure, the medium comprising an amount of bicomponent fibers blended with glass fibers, wherein the bicomponent fibers are concentric sheath/core PET/PET fibers.