# US 4,399,033 A · Fluid filtering device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,399,033 A - Document ID: US4399033A - Status: Granted - Kind: A - Application number: 06/259,247 - Filed: 1981-04-30 - Granted: 1983-08-16 - Earliest claimed: 1981-04-30 - Inventors: Borje O. Rosaen; Dale P. Fosdick - Web page: https://patentgrep.com/patent/US4399033A ## CPC - B01D 35/147: Bypass or safety valves - B01D 29/15: arranged for inward flow filtration - B01D 35/027: rigidly mounted in or on tanks or reservoirs (B01D35/04 takes precedence) - B01D 35/157: Flow control valves: Damping or calibrated passages - 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 fluid filtering device is provided for use with a fluid reservoir. The filtering device comprises a housing having an elongated tubular and cylindrical part defining an interior chamber. A fluid port is formed at one end of the housing and the port is open to the chamber. The housing is secured within the reservoir so that the housing is submerged below the reservoir fluid level. A fluid passageway is formed through the housing to establish fluid communication between the fluid in the reservoir and the housing chamber. An elongated guide member is also secured to the upper end of the tubular housing part so that the guide member extends upwardly from the housing. A filter assembly comprising a tubular filter element and a coaxial elongated extension is manually insertable over both the guide member and the tubular housing part whereupon the filter element is fluidly positioned between the housing chamber and the fluid in the reservoir. ## Claims ### Claim 1 A fluid filtering device for use with a fluid reservoir in which a fluid is contained comprising: a housing defining an interior chamber, said housing having a tubular cylindrical part and a fluid port open to said chamber and adapted for connection with a fluid system, said housing being adapted to be positioned in said reservoir so that said housing is submerged below the fluid level of the reservoir, fluid passage means formed through said housing for establishing fluid communication between the fluid in the reservoir and said housing chamber, an elongated guide member secured at one end to and extending coaxially outwardly from one end of the tubular cylindrical housing part, a filter assembly slidably insertable over said housing part comprising: a tubular filter element open at each end, an elongated extension secured at one end to one end of the filter element, wherein said filter assembly is insertable over said guide member and over said tubular housing part to a filtering position so that said fluid passage means are positioned intermediate the ends of the fluid element, means for fluidly sealing the end of the filter element to said housing, and means attached to the opposite end of said extension for closing said fluid passage means upon inverting said filter assembly and inserting the inverted filter assembly over said housing part. ### Claim 2 (depends on 1) The invention as defined in claim 1 wherein said guide member is dimensioned so that it extends above the fluid level in the reservoir. ### Claim 3 (depends on 1) The invention as defined in claim 1 and further comprising stop means for limiting the insertion of said filter assembly over said housing part. ### Claim 4 (depends on 1) The invention as defined in claim 1 wherein said closing means further comprises a closure tube insertable over said housing so that said fluid passage means are positioned intermediate the ends of the closure tube, and means for fluidly sealing the opposite ends of the closure tube to the housing part. ### Claim 5 (depends on 4) The invention as defined in claim 4 and further comprising means for limiting the insertion of said closure tube over said housing part. ### Claim 6 (depends on 1) The invention as defined in claim 1 wherein said housing is constructed from a standard pipe fitting. ### Claim 7 (depends on 6) The invention as defined in claim 6 wherein said tubular housing part comprises a pipe fitting having a reduced outer diameter portion along its length which forms a tool gripping surface. ### Claim 8 (depends on 7) The invention as defined in claim 7 wherein said housing further comprises a T fitting having at least two openings, said one pipe fitting being secured to one opening and the other opening forming said fluid port. ### Claim 9 (depends on 1) The invention as defined in claim 1 wherein said fluid passage means comprises a plurality of further fluid ports formed through the housing part closely adjacent said one end of said filter element when said filter assembly is in said filtering position. ### Claim 10 (depends on 9) The invention as defined in claim 9 and further comprising means for directing fluid flow through said fluid passage means from said one end of the housing part and toward the other end of the housing part. ### Claim 11 (depends on 10) The invention as defined in claim 10 wherein said directing means comprises a conical end piece attached to said one end of the guide member, said conical end piece having its apex extending toward said other end of the housing part, and at least a portion of said conical end piece being aligned with said further ports. ### Claim 12 (depends on 1) The invention as defined in claim 1 wherein said guide member is dimensioned so that its other end extends above the fluid level in the reservoir. ### Claim 13 (depends on 1) The invention as defined in claim 1 and further comprising a conical end piece attached to the other end of the guide member which aligns the filter assembly with the guide member.