# US 5,700,304 A · Filter with protective shield > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,304 A - Document ID: US5700304A - Status: Granted - Kind: A - Application number: 08/610,116 - Filed: 1996-02-29 - Granted: 1997-12-23 - Earliest claimed: 1996-02-29 - Assignees: Donaldson Company, Inc. - Inventors: Chong-Kim Foo - Web page: https://patentgrep.com/patent/US5700304A ## CPC - B01D 46/2411: {Filter cartridges} - 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 element is provided. The filter element generally includes a first liner, a region of filter media positioned downstream from the first liner and a screen arrangement positioned along a portion of the first liner downstream surface and oriented to block a portion of the first liner to flow directly therethrough and into a portion of the filter media directly associated therewith. Preferred elements are generally cylindrical, having expanded metal outer and inner liners with pleated paper media positioned therebetween. The preferred screen arrangement includes a polymeric sleeve, partially embedded in one of the end caps. Also according to the invention an overall filter arrangement or assembly is provided. Such an assembly includes the filter element as well as a housing and a precleaner arrangement. ## Claims ### Claim 1 A filter arrangement comprising: (a) a housing; (b) a removable and replaceable cylindrical filter element operably positioned in said housing for filtering of air passing therethrough; said filter element comprising: (i) a first liner having regions open to passage of air therethrough; said first liner having an upstream surface and a downstream surface; (ii) a region of filter media positioned downstream from said first liner; and (iii) a screen arrangement positioned along a portion of said first liner downstream surface; said screen arrangement being substantially impervious to air flow through any portion thereof; and said screen arrangement being positioned to block said portion of said first liner to air flow therethrough and into a portion of said region of filter media; and, (c) a precleaner arrangement including: (i) a tangential air inlet constructed and arranged to direct air flow into said housing in a circular pattern around said filter element; and, (ii) a particulate collection chamber; (d) said screen arrangement including a portion aligned with said tangential air inlet to inhibit air from passing into said air filter element without first passing in a circular flow at least partially around said filter element. ### Claim 2 (depends on 1) A filter arrangement according to claim 1 wherein: (a) said filter element includes first and second, opposite, end caps; (b) said first liner comprises an expanded metal outer liner of cylindrical configuration embedded in, and extending between, said first and second end caps; and (c) said region of filter media comprises pleated paper media arranged in a cylindrical configuration with pleats extending longitudinally between said first and second end caps; said pleated paper media including end portions embedded in said end caps. ### Claim 3 (depends on 2) A filter arrangement according to claim 2 wherein: (a) said screen arrangement comprises a film positioned between and against a portion of said pleated paper filter media and a portion of said outer liner. ### Claim 4 (depends on 3) A filter arrangement according to claim 3 wherein: (a) said flexible film includes a portion embedded in said first end cap, and a portion extending a first length of extension at least 40 mm along said outer liner from said first end cap toward said second end cap; and (b) said precleaner arrangement tangential air inlet is constructed and arranged to initially direct air flow around a portion of said filter element adjacent said first end cap. ### Claim 5 (depends on 4) A filter arrangement according to claim 4 wherein: (a) said tangential air inlet is generally circular in cross section with an inner diameter no greater than said first length of extension. ### Claim 6 (depends on 1) A filter arrangement according to claim 1, wherein: (a) said screen arrangement comprises a polymeric film. ### Claim 7 (depends on 1) A filter arrangement according to claim 1, wherein: (a) said screen arrangement comprises a film about 0.1 mm to 1.0 mm thick. ### Claim 8 (depends on 1) A filter arrangement according to claim 1, wherein: (a) said screen arrangement comprises a cylindrical sleeve of polymeric film material positioned between said first liner and said region of filter media. ### Claim 9 (depends on 8) A filter arrangement according to claim 8, wherein: (a) said sleeve of polymeric film material is positioned against said first liner on one side; and, against said region of filter media on an opposite side. ### Claim 10 (depends on 8) A filter arrangement according to claim 8, wherein: (a) said sleeve of polymeric film material comprises polypropylene. ### Claim 11 (depends on 1) A filter arrangement according to claim 1, wherein: (a) said region of filter media comprises a cylindrical extension of pleated paper filter media.