Abstract: A membrane filter assembly is disclosed which employs at least one filter membrane and includes support means to prevent overflexing or overstressing of the filter membrane when high fluid pressures occur. The membrane support means includes a substantially co-extensive support or back-up surface spaced a small distance from the membrane to allow liquid flow therethrough but to prevent stretching or flexing beyond its elastic limit. Preferably the support surface comprises a second filter membrane in parallel flow relationship with the first to provide high flow rates during normal flow conditions but which flex together during high pressures conditions to mutually support one another and to prevent further flexure of either membrane beyond its elastic limit.

Abstract: A leukocyte filter for blood which includes a housing defining a blood inlet and outlet at respective ends thereof, with the housing enclosing and carrying a tubular, non-woven fiber filter element, with one of the inlet and outlet communicating with the interior of the tubular filter element, and the other of the inlet and outlet communicating with the exterior of the tubular filter element. In the tubular filter element, essentially all of the fibers define diameters of 10 to 100 microns, and have other diameter restrictions described herein, with the fibers being bonded together to define a generally fixed, average interstitial spacing which is less at the inner surface of the tubular filter element than at the outer surface thereof. The air permeability of the filter per square foot is preferably from essentially 15 to 45 SCFM at one half inch of water.

Abstract: A vented filtration device comprising a closed, flexible and compressible housing having a liquid inlet and a liquid outlet. The housing includes an internal passage connecting the inlet and the outlet. A liquid filter assembly is disposed within the passage between the inlet and outlet thereby defining an upstream pressure section between the inlet and the filter and a downstream pressure section between the filter and the outlet. This assembly includes a flexible, porous bacteria retentive filter membrane, a flexible, porous support material overlying one surface of the filter membrane and a frame having at least one large central opening overlying the opposite surface of the filter membrane. A gas vent located in the housing communicating with the upstream pressure section of the passage is adapted to allow gas but not liquid to pass from the upstream section out of the housing.

Abstract: A filter adapted for use in a fluid passage and having a novel structure for coupling to the fluid passage. The filter has a general configuration of a bottom-ended cylinder, with the bottom portion formed with a plurality of bores constituting a filtrating screen. The cylinder has an annular joining projection at an end remote from the filtrating screeen, the projection being securely elastically fitted on the outer circumferential surface of a restriction fixed to the fluid passage or on the inner surface of the fluid passage, securely and airtightly coupled to each other. The filter is positioned close to the constriction of the fluid passage, the risk of accumulation of alien matter therebetween being eliminated. Also, the entire cylindrical filter is made from an integral molding of elastic material, there being no likelihood of adverse effect by the fibers that constitute the filter.

Abstract: A filter for use within a storm drain sump which has a fluid outlet through a wall of the sump, the filter includes a bag-like body member having a cylindrical body portion fabricated from resilient mesh-like synthetic material. A base portion of the filter defines a toroid-shaped section. A weighted material is placed within the toroid-shaped section. Wedge-shaped spacers are axially aligned and secured to an outer face of the cylindrical body portion of the filter. A suspension plate is secured to the body member to support the filter in the storm drain sump.

Abstract: An improved fluid filter housing and filter bag seal wherein the filter bag includes an annular downturned lip of flexible, shape-retaining material which in part defines an opening into the bag. The housing carries an annular rim in part defining an opening into the housing. The bag lip is forced into sealing engagement with the housing rim by the housing cap to form a fluid-tight seal.

Abstract: A fluid filtering device is provided for connection with a fluid line. The fluid device includes a housing having a fluid inlet on one end, a fluid outlet on the other end and a fluid passage formed through the housing. The fluid passage connects the inlet with the outlet and includes a port formed along its length. A tubular filter element open at one end is removably insertable into a filter chamber formed within the housing and, upon insertion, is axially slidable between a first position in which the open end of the filter element abuts against the fluid port and a second position in which the open end of the filter element is spaced from the fluid port. A spring urges the filter element toward its first position. In operation the fluid flow into the housing inlet passes through the port and into the interior of the filter element. The fluid then flows through the filter element and to the housing outlet.

Abstract: In a blood filter of the type having a blood inlet spike which is to be inserted in a blood bag the improvement comprising the outer surface of the blood inlet spike having a roughness of from about 50 to 200 microinches.

Abstract: A suction mechanism submerged underwater in a lake, the suction mechanism being designed to eliminate sand and mud from entering a foot valve connected to hoses for pumping water out of lake for use; the suction mechanism including the foot valve being at the upper end of a vertical suction pipe, the foot valve being covered by a protective dome, a horizontal anchor stand supporting the suction pipe vertically and the lines leading from the lake including a suction pipe and a pressure pipe.

Abstract: An arrangement for removing water from mud and the like has a flexible container having an inlet and an outlet opening. A flexible tubular member is located outside and adjacent the outlet opening of the container. Means are provided for deforming the flexible tubular member so that the latter closes the outlet opening of the container during dewatering of the mud. The flexible tubular member may be formed either of a one piece with the container or as a separate part connected to a front end portion of the same. At least two ring-shaped elements are provided, one of which elements is connected to the front portion of the container, and the other element is connected to the flexible tubular member and rotatable relative to the first ring-shaped element. By means of rotation of the other ring-shaped element the flexible tubular member is deformed so as to close the outlet opening.

Abstract: Strainer Apparatus for mounting within a tube, the apparatus comprising a strainer element having a cylindrical body portion and a conical end portion and a retainer having two concentric spaced cylindrical surfaces between which the strainer element is fastened, and a resilient collar containing a multiplicity of openings, said collar having an outside diameter greater than the internal diameter of the tube whereby upon insertion into the tube the collar is compressed forming a tight fit with the tube and holding the strainer apparatus stationary within the tube.

Abstract: A hub assembly for use in the filtration of fluids comprising a hub with a tapered bore extending therethrough, and a filter membrane in the bore. The filter membrane has a first portion extending across the bore and a second portion extending from the first portion in substantial contact with the hub around the bore. Means within the bore presses the second portion into tight contact with the hub around the bore to secure the filter membrane therein.A method of fabricating a filter membrane and inserting the same into a hub having a bore extending therethrough, the bore being substantially circular in cross section and tapered to define a large opening at its proximal end and a small opening at its distal end, includes forming a substantially flat, circular filter membrane from a filter medium, the membrane having a diameter larger than the large opening of the bore.

Abstract: A filter assembly is provided for filtering pharmaceutical fluid materials without danger of contaminating downstream effluent in the event of leakage of unfiltered fluid material past a filter seal, comprising, in combination, a filter housing comprising first and second housing parts; the first housing part having a first fluid chamber open at one side, a fluid port opening into the fluid chamber, and a peripheral sealing lip; the second housing part having a second fluid chamber open at one side, a fluid port opening into the fluid chamber and a peripheral sealing lip; sealing means between the peripheral lips; retaining means holding the housing parts and sealing means in fluid-tight juxtaposition; a filter element disposed in the second fluid chamber in the second housing part and comprising a tubular filter confined between and sealed in a fluid-tight seal to end caps at each end thereof, of which a first end cap is closed, and a second end cap has an opening therethrough communicating the interior of t

Abstract: The present invention relates to a system for automatically recovering the entirety of the excavated materials in the order in which they are raised to the surface.The excavated materials being delivered through the central passage of a double pipe system pass into a strainer pipe 6 discharging into a perforated recovery sheath 5 which is closed at its base. A decompression sleeve 3 encloses the strainer pipe. Air and water are evacuated through the strainer slots 6 and all the excavated materials are deposited at 5 in the order in which they are brought up.The invention is applicable to any reverse circulation drilling system.

Abstract: In a blood filter of the type having a blood inlet spike which is to be inserted in a blood bag the improvement comprising the outer surface of the blood inlet spike having a roughness of from about 50 to 200 microinches.

Abstract: A filter for blood comprising a pair of members together forming a housing with an inlet and an outlet, an aperture diaphragm between said members across the interior of said housing and dividing said housing into a filter chamber and a drip chamber respectively communicating with said inlet and outlet, means forming a hermetic and sterile seal between said members, and a plurality of filter elements serially disposed within said housing so that blood being filtered therethrough must pass in sequence through said inlet, through all of said filter elements, through the aperture of said diaphragm and then through said outlet. Preferably at least four woven nylon screens are employed as the filter elements in a nylon housing, the filter elements in the direction of flow successively having screen sizes of about 200 .mu., 50 .mu., 20 .mu. and 10 .mu..

Abstract: A fluid filter assembly is comprised of a flexible, compressible housing, a filter pouch in the housing formed from membrane filter media and having a fluid opening in one end thereof, a fluid inlet extending into the housing in fluid communication with the interior of the filter pouch through the fluid opening, and a fluid outlet extending from the housing in fluid communication with the interior of the housing external of the filter pouch. Fluid may pass through the fluid inlet into the interior of the filter pouch, then pass through the membrane filter media of the filter pouch into the interior of the housing external of the filter pouch and finally exit from the housing through the fluid outlet. The unique filter pouch may be made by providing a filter sheet of membrane filter media and folding the sheet substantially in half to form a filter pouch configuration having a folded edge, two edges adjacent the folded edge and an edge opposite the folded edge.

Abstract: A self supporting-one piece resilient metal wire cloth filter having an integral and permanent bypass opening (window), the filter being removably disposed in the inlet duct of an internal combustion engine radiator. The filter can be removed, flushed, and reinstalled to remove foreign particles entrained with the liquid coolant as the latter circulates, thus permitting continued high efficiency of heat transfer from the hot cylinder to the coolant and from the coolant to the radiator core.

Abstract: A blood filter unit comprising an assembly for supporting a filter cartridge, a filter cartridge, and a housing for the assembly and cartridge. The assembly for supporting the cartridge comprises a permeable cylindrical core with a bottom member and a top cap. The filter media, in the form of a cartridge, is disposed about the periphery of the core and extends between the bottom member and top cap. The core contacts the media only at intermittent areas spaced longitudinally and circumferentially about the core. The core, media and walls of the housing are tapered with respect to each other.

Abstract: A reservoir tank has filling and outlet ports which are provided in a common aperture formed through the tank top.

Abstract: A fluid filter including a filter body having inlet and outlet passages communicating with an open ended chamber on opposite sides of a tapered seat area. A cupshaped fluid filter or strainer element is located in the chamber through the open end thereof and is adapted to be closely received in the seat area. A bonnet assembly covers the open end of the chamber, is threadedly mounted to the body and is comprised of a bonnet, a bonnet nut and biasing means. The biasing means is employed to exert a biasing force against the filter or strainer element to continuously urge it toward the seat area. At least the bonnet and bonnet nut are themselves interconnected in a manner that permits both rotational and limited axial movement therebetween. The disclosed structure facilitates access to the chamber and filter or strainer element without the necessity for removing the entire fluid filter structure from a service installation.

Abstract: The specification and drawings disclose a fluid filter device which includes a central body section clamped between a pair of end fittings by a plurality of longitudinally extending tie bolts. The tie bolt arrangement is such that only one bolt must be removed to permit the central body section to be swung out of position between the end fittings for filter cleaning, changing, or the like. The central body section includes a cylindrical through passage which extends longitudinally of the body perpendicularly to end faces which mate with the end fittings. A filter cartridge is received in the through passage and includes a cylindrical sleeve which is sized so as to be closely and slidably received in the passage. Filter elements are mounted within the sleeve. Additionally, seal rings are carried about the opposite ends of the sleeve to provide a fluid seal between the end fittings and the central body, as well as to prevent leakage between the outside of the sleeve and the wall of the passageway.

Abstract: A filter including a housing spanned by a cap. A liner constituting a filtering medium is fitted into the housing with the outer surface of the liner contacting the inner surface of the housing. A wall member supports one end of the liner within the housing. Liquid is introduced into the filter housing through an inlet port where it passes through the liner and out openings formed by the wall member at one end of the liner.

Abstract: A flat profile filter for IV sets and the like, includes an elongate, flat housing having a filter supporting frame therein defining at least one longitudinally extending, laterally facing opening of greater size than could be accommodated transversely in the housing, and a filter element secured on the frame in spanning relationship to the opening.

Abstract: A fluid strainer element capable of withstanding high differential pressures when used and which facilitates straining of fluid flowing through the continuous side wall and one end wall of the element. The strainer is generally cup-shaped and includes an inner cup-shaped support structure having staggered perforations extending through the surfaces thereof. An outer cup-shaped strainer structure constructed of wire mesh is closely received over the support structure with the open ends of the two structures being substantially coextensive with each other. An annular binding ring is closely received over the structure open ends and is rigidly affixed thereto. The mesh size of the straining structure may be varied as is desired and/or necessary for any use and normal fluid flow through the strainer is from outside to inside the element.

Abstract: A glass-enclosed integral glass and ceramic filter unit is described for filtering sulfuric acid or other liquid solutions which do not attack silica and in which the sole communication between a first and a second chamber within a totally enclosing glass housing is through the pores of a ceramic filter membrane. This microporous ceramic membrane is connected to the interior of the glass housing by a glass seal wall member fusion bonded thereto advantageously providing an integral filter unit without any mechanical pressure seals or gaskets or other sealing elements having joints through which finely divided particulate matter could by-pass the filter membrane.

Abstract: A drip chamber for use in the intravenous administration of liquids formed of a generally vertically disposed, hollow chamber provided with inlet means and outlet means, with the chamber being adapted to maintain a liquid level of the intravenous liquid to be administered, and a hydrophilic filter element disposed in the drip chamber between the inlet means and outlet means. The hydrophilic filter element is constantly wetted with the liquid in the drip chamber to permit the passage of liquid through the filter element while simultaneously blocking air. The drip chamber of this invention can also be provided with a hydrophobic filter element to facilitate the elimination of air from the drip chamber.

Abstract: This invention is a fuel filter for use in a fuel line to remove particles from fuels that are subject to freezing under certain operating conditions. The fuel filter has a screen slideably carried on a piston located in an elongated housing. Fuel enters one end of the housing, strikes the piston and flows outwardly through the screen, around the piston, through holes in a spacer and out the other end of the housing. Upon freezing in the screen the fuel or water particles suspended therein, the pressure of the fuel will move the screen and piston along the axis of the housing to open a bypass around the screen. When the frozen particles melt or fuel pressure is removed, a spring returns the piston and screen to their normal position. Solid particles previously removed from the fuel before freezing remain trapped in the screen.

Abstract: A cylindrical, cup-shaped, porous, sintered powdered metal filter is sealed in a tubular thermoplastic fitting (e.g., the needle-retaining hub of a hypodermic needle or an adaptor or a connector in the line of an intravenous infusion set) by force-fitting the open end of the filter within an annular bead on the interior wall of the tubular fitting and induction heating the filter so that the thermoplastic bead will flow into the pores of the filter to form a continuous ring seal between the filter and the interior wall of the fitting.

Abstract: An in-line filter unit is provided for use in a circulating fluid system. Such a unit is made essentially into one piece to insure watertight. A debris reservoir is provided to store the debris removed from the fluid. A diffuser is placed in the line of fluid flow for preventing direct contact by the fluid entering the unit with the filter and for preventing damage to the filter.

Abstract: A blood filtration unit for filtering multiple units of blood comprising means for attaching the unit to a blood reservoir, a drip chamber and a segmental filtration compartment for filtering blood.

Abstract: A filter for arresting the flow of a liquid entrained, deformable solid or semi-solid body through a tubular vessel or conduit, the filter including a plurality of convergent legs in generally conical array and joined at their convergent ends to an apical hub, each leg having a reversely bent hook at its end which is distal with respect to the hub. Each leg also includes a plurality of bends intermediate its length, which bends decrease the solids by-pass capability of the filter without concurrent fluid occlusion.An intrument for inserting the filter in a tubular environment is provided and includes a carrier for supporting the filter in a collapsed, compact status, an ejector mounted in the carrier for ejecting or releasing the filter from the carrier and an elongated flexible tube connected to the carrier for moving the carrier and filter to the locus of use of the filter, and for supplying an ejector actuating fluid to the ejector.

Abstract: A filter device particularly directed to the straining of materials for coating paper products which device is provided with a tapered baffle element to particularly aid in the back flushing of the filter to provide cleaning thereof and said baffle having a plurality of arcuately spaced fin members thereon for supporting of a filter element thereabout. This filter element is formed of a replaceable material having a plurality of apertures therethrough which material is normally non self supporting and which material gains its filtering support and positioning by the finned structure which will support the filtering element in both the normal filter operation and the back wash operation.