Abstract: A suction head for a fuel line of a fuel tank, especially for hand-held working tools such as motor chainsaws, has a cup-shaped housing made of plastic and comprising a mantle wall with cutouts and an end face with an opening. A filter mesh is covering the cutouts. A filter insert is inserted into the housing through the opening in the end face. A cap made of plastic and having a connector for the fuel line is sealingly connected to the end face with the opening.

Abstract: A method of producing a fluid purifier membrane module, sheets of membrane material are disposed in layers with intermediate spacer elements in a manner to obtain mutually alternating spaces for contaminated and purified fluid respectively. Mutually adjoining sheets of membrane material (12) are joined together in pairs in a manner to obtain membrane units (10) which include closed cavities (28). The membrane units (10) with associated spacer elements (18, 34) are arranged in a stack. The mutually facing outer surfaces of the membrane units are joined together in zones and in a fluid-tight fashion along at least one line (36) which extends through the walls of the membrane units. The membrane units are perforated along the line in a manner to obtain through the membrane units a passageway (32) which communicates with the cavities (28).

Abstract: A filter assembly includes a housing having an inlet and an outlet, at least two filter elements stacked inside the housing, and a spacer positioned between the filter elements. The spacer includes a body having an opening which is larger than the inner diameter of at least one of the filter elements and is no smaller than about one-third of the outer diameter of a filter element. The spacer is free of any structure which extends into the opening.

Abstract: A filter includes a pleated filter element having longitudinally extending pleats and a wrap member wrapped around the filter element. The wrap member is joined to the peaks of the pleats and has openings for increasing the dirt capacity of the filter. The filter element may be a composite of a filter layer, upstream and downstream support and drainage layers, a cushioning layer between the upstream support and drainage layer and the filter layer, and polymeric beads on the downstream side of the downstream support and drainage layer. An extruded polymeric mesh may comprise one or both of the upstream and downstream support and drainage layers.

Abstract: A disposable device for absorbing and removing liquid lipids, primarily molten fats and oils, from the surface of an aqueous food mixture. The device comprising a multitude of capillary passages separated by partitions of a pellicular material possessing both hydrophobic and lipophilic properties. The capillary passages and partitions extend vertically through the device between its upper and lower faces. When exposed to the surface of an aqueous food mixture, the device selectively absorbs liquid lipids but does not absorb appreciable quantities of water or other ingredients present in the food mixture.

Abstract: A hollow fiber blood oxygenator is provided having a plurality of enclosed, coaxial heat exchanger coils, having a common header to insure uniform temperature in the coils. An enclosed fiber bundle is concentrically positioned inside the heat exchanger coils to define a flow path around the coils and through the fiber bundle. The heat exchanger coils and the outside of the fiber bundle are tapered to provide a close fit. Gas manifolds direct gas flow to and from the hollow fibers.

Abstract: A hollow fiber blood oxygenator is provided having a plurality of enclosed, coaxial heat exchanger coils, having a common header to insure uniform temperature in the coils. An enclosed fiber bundle is concentrically positioned inside the heat exchanger coils to define a flow path around the coils and through the fiber bundle. The heat exchanger coils and the outside of the fiber bundle are tapered to provide a close fit. Gas manifolds direct gas flow to and from the hollow fibers.

Abstract: A machining solution filtration apparatus for a machining device which includes: a filter, a filter medium which is arranged separately from the filter and supplied continuously; a unit for supplying a contaminated machining solution to the filter medium; a unit for generating a difference in pressure between the upper surface and lower surface of the filter medium; a unit for returning a machining solution filtered via the pressure difference to a filtered solution vessel; a unit for selecting the filter to allow the machining solution to be filtered only thereby for a predetermined period of time; a unit for detecting the presence/absence and/or remaining amount of the filter medium; and a unit for controlling the speed of supplying the filter medium.

Abstract: A liquid-cleaning filtering system with distillation capability has twin permanent filter assemblies, each utilizing a wire mesh filter cartridge which is backwashed using an internal sprayer nozzle assembly. During the normal operation of the filter cartridge, which is located in a pressurizable inverted bell housing, contaminates are filtered through a sheet of wire mesh arranged in a star configuration on a frame structure within the filter cartridge. The liquid filtering system is especially adapted for use in dry cleaning operations where a layer of diatomaceous earth and a layer of activated carabon deposited are on the wire mesh at the start of normal forward flow. Contaminates collect on this filter bed, thus cleaning the dry cleaning solvent.

Abstract: A filter screen assembly for removing particulate material from a slurry in a vessel. Mass producible slotted faced plates are assembled in pairs to enclose a chamber means between two slotted faces, an apertured edge and three closed edges mounted on a collector tube with the chamber in communication with the bore of the tube through said apertured edge, one end of the tube being closed and the other end being in communication with an intake port of a pump and said chambers. A filter media envelopes assembled pairs of slotted faced plates and the portion of the collector tube they are mounted on, while the other portion of the collector tube projects from an opening in said envelope and is sealingly engaged by a collar portion of the media secured against the collector tube. Reduced pressure impressed on the interior of the collector tube causes a slurry of liquid and particulate no greater than a predetermined size to be drawn through the media and slots in the plates.

Abstract: The liquid filter assembly including a filter housing with an inlet below a prescribed external liquid level and having a generally cylindrical filter unit inside it with reusable filter elements which effectively operate at low pressure drops and permitting bypass liquid to recirculate within the filtered section without passing through the filter element and providing a filter support frame having the filter element supported thereon to provide a changeable filter assembly unit sealingly mounted within the housing.

Abstract: A filter device for use in a residential water supply system, or the like. The device includes a container having an enclosed cavity, and includes a filter unit disposed in the cavity. The device includes a two-stage filter having a first radial flow filter subassembly and a second axial flow filter subassembly.

Abstract: A hollow fiber blood oxygenator is provided having a plurality of enclosed, coaxial heat exchanger coils, having a common header to insure uniform temperature in the coils. An enclosed fiber bundle is concentrically positioned inside the heat exchanger coils to define a flow path around the coils and through the fiber bundle. The heat exchanger coils and the outside of the fiber bundle are tapered to provide a close fit. Gas manifolds direct gas flow to and from the hollow fibers.

Abstract: A filter for cylindrical of flat filter equipment for the mechanical purification of liquids as described which is assembled of several filter elements (4) arranged one above the other which disclose always gap-shaped filter openings between them and which are fastened by rods led through them and locking flanges. The passage openings for the rods are formed as sleeves (7) to which distance holders (8) belong. The filter elements have trapezoidal cross-section, the outer longer base side (16a) of which, together with the height of a filter opening, make out the height of the sleeve (7).

Abstract: A tubular filter element consisting of a filter leaf which is pleated and connected at both its fold ends to a hollow cylindrical filter body (F) both of whose front surfaces are sealed by end caps (11, 13), one end cap (13) of which opens, as a connection cap, the hollow core (10') for communication with a housing space (3) of a surrounding housing, the force flow guidance of the fluid to be treated takes place along the folds (10) through a tube (6', 5) which extends through the hollow core (10') of the filter body (F), rests on the fold edges of the filter body (F), is open at one end in the area of the fold range functioning as outlet or inlet (20), is tapered in the area of the fold range functioning as inlet or outlet (21) and forms a connection (5) for the recirculating flow of fluid coaxially to the connection cap (3) for the flow of fluid to be treated which cap establishes the housing communication.

Abstract: A spirally wound ultrafiltration filter cartridge system and method which comprises a membrane sheet material forming a closed loop having a one end and an other end with first and second open spacer sheet materials, the membrane sheet material and spacer sheet material wrapped about a perforated center tube, the membrane sheet material sealed at either end by solid resin headers, the filter cartridge forming spirally wound permeate and concentrate flow channels and having a tangential, elongated feed inlet on the exterior surface of the filter cartridge. A concentrate stream is removed from the center tube and a permeate stream is removed from the one end of the closed loop of the membrane sheet material. The method of manufacture comprises spirally winding the closed end loop sheet material and the spacer sheet material about a perforated center tube and sealing either end of the membrane sheet material with a ptting resin.

Abstract: An ultrafiltration module and method of constructing same is the subject of the present invention. The module comprises a permeate collector tube and one or more membrane leaves wound around the tube together with a feed channel spacer so as to present spaced layers of membrane leaves or envelopes that are contacted by fluid flowing axially through the module in the channel provided by the feed spacer screen. The feed spacer screen projects beyond the terminal ends of the leaves to present an open mesh outerwrap screen circumscribing the wound leaves. A plurality of restraining bands are provided in longitudinally spaced relationship along the length of the module. These bands are designed to hold the entire module assembly in tight spiral relationship. Preferably, the bands are constructed of heat shrinkable material and are thus secured in place and tightened by the application of heat.

Abstract: The invention includes a filter element (10) having a pair of end caps (12) with pleated, corrugated filter media (14) spanning therebetween. The filter media (14) is sealed or potted into the end caps (12) with a potting material ( b 16). To ensure substantially uniform penetration of the plates of the media (14) by the potting material (16), the edges of the media (14) are configued to eliminate "linear check valve" action between pleats. Several edge patterns can be used to minimize the formation of linear check valves, including a saw tooth pattern; sine wave pattern; vertical edge corrugations; flat edge regions; and saw kerfs in the edges of the media.

Abstract: An improved fluid filter medium, including a fabric member having a plurality of folds that are seamed at the top and bottom to form a fabric sleeve with pockets, such pockets being configured to enclose the leaves of a filter element frame. A tubular seal is seemed to each end of the fabric sleeve and filled with a resilient material to form a compressible seal. Each tubular seal is configured to be compressed between the central cylindrical perforated core of the filter element frame and a sealing plate or flange such that, upon compression, the tubular seal forms a seal between the sealing plates or flanges and the fabric sleeve.

Abstract: A filter screen assembly for removing particulate material from a slurry. The assembly includes filter media for accumulating particulate of larger than predetermined size as filter cake exteriorly of plates having a plurality of slots therein. A hook member along an edge of each of the plates engages a tubular distributor having slots therealong. Each of the slots of the tubular distributor receives the hook member of one of the plates so that the plates are mounted on the tubular distributor. Other edges of the plates are connected to form chamber means therebetween. The chamber means communicates with the interior of the tubular distributor. A reduced pressure is impressed on the interior of the tubular distributor to cause liquid of the slurry to be drawn through the slots in the plates so that the particular material collects on the outside of the plates.

Abstract: A filter assembly comprises a casing, a semiflexible, perforated core and a filter cloth. The casing is provided with a liquid inlet and a liquid outlet and the core is arranged within the casing and between the liquid inlet and the liquid outlet so that liquid which passes from the inlet to the outlet must pass through the core at least once. The filter cloth covers the surfaces of the core so that liquid which passes from the inlet to the outlet must pass through the filter cloth at least once. In a first embodiment, the core includes an outer cylindrical portion, an inner cylindrical portion, an annular intermediate portion extending between the outer cylindrical portion and the inner cylindrical portion, and a plurality of fin portions extending radially inward from the outer cylindrical portion toward the inner cylindrical portion. In a second embodiment, the core includes a cylindrical portion and a plurality of fin portions extending radially outward from the cylindrical portion.

Abstract: A filter section for a roatatable filter of the kind including a plurality of sections (5) assembled into an annular filter disk. Each section (5) comprises two mutually spaced plate-shaped elements (6,7) which are at least partially perforated and provided with protrusions (8) keeping a filter cloth (9) spaced from the plate-shaped elements. The space between the plate-shaped elements (6,7) is in communication with a discharge conduit (2) for filtrate. At least one substantially radial drainage channel (12) is arranged between the plate-shaped elements (6,7), this channel communicating with the outlet (13) of the section. The space between the plate-shaped elements (6,7) at the side of the drainage channel (12) is filled with a hardened compound (11), and the plate-shaped elements (6,7) are provided with openings (10) towards the channel (12).

Abstract: In an integral filter (F) for separating fluid components which filter can be enclosed in a surrounding housing (1,2) with fluid connections (A1 l to A3, 10) the permeable tube jacket of which filter consists of several tubular filter elements (K1, K2) with different filter qualities whose cross sections are stepped in such a manner that a smaller filter element is surrounded by a larger filter element, optionally with formation of an intermediary space (Z1), and in which the two tube ends are enclosed by closure and connection adapters (15, 20, 21, 22, 27, 31) and can be adapted to fluid chambers (13, 14) of the housing, sections of the total filter (F) can be selectively tested for integrity, supplied with and emptied of fluid and filling substances via an intermediary space (Z1) between two filter elements (K1, K2) which intermediary space can be separately controlled and loaded from the outside.

Abstract: A precoat filter element for a precoat filter unit comprises a flow distributor and flow straightener. The flow distributor surrounds a filter septum and has openings through which liquid may flow. The proportion between the area of openings and the area of a wall of the flow distributor may vary along the length of the septum to distribute flow over the length of the filter septum in a predetermined manner. A flow straightener is provided at the base of the septum to reduce turbulence during precoat and filtration operations, and to reduce the occurrence of large flocs in precoat slurries during coating operations.

Abstract: The element is disposed in a vessel receiving a fluid flow. The vessel wall is porous at least for a proportion of the fluid and bounds an inner chamber communicating through the vessel wall with a chamber outside the vessel. The element is in the shape of a plate or tube and is so devised that the porous wall either on its own or in combination with other similarly shaped elements to form a module, forms a turbulence generator particularly in the form of a static mixer for the fluid flow. The resulting turbulence on the wall of the elements ensures that the wall remains porous.

Abstract: The coalescing plate is designed to separate immiscible components of differing densities mixed in a fluid. The plate includes bidirectional corrugations forming crests and valleys. Bleed holes are provided in the crests and valleys to allow the immiscible components to pass through. Plural plates are stacked and separated by spacers. The spacers are configured to provide multiple spacings between adjacent plates. The immiscible components less dense than the host fluid migrate upwardly and pass through the bleed holes in the crests. Solids and other components denser than the host fluid move downwardly and pass through the bleed holes in the valleys. The plates are readily cleaned in situ by passing a nozzle through the bleed holes nad introducing a pressurized fluid or gas to flush out the space between the plates.

Abstract: A spirally-wrapped reverse osmosis membrane cell employing an envelope of semipermeable membrane sheets spirally wound or wrapped about a tubular mandrel. The convolutions of the membrane assembly are separated to form an open channel, directed feed flow path leading into a lateral opening or series of openings in a communicating tubular member defining an unobstructed bore throughout its length. The feed separator may comprise a plurality of substantially parallel strips of impermeable material of a thickness sufficient to provide desired separation between membrane sheets and wherein the strips define a meandering fluid flow path throughout the length and width of the membrane sheet.

Abstract: A filter element constructed of stainless steel. The element includes a pair of filter media concentrically disposed to receive parallel flow of the filtrant. The element is adapted for disassembly to remove the filter media. The various component parts of the filter element may thereafter be easily cleaned and the filter media replaced. The filter media after being removed may also be cleaned and reused if desired. The component parts include appropriate guard assemblies to protect the filter media during handling and use.

Abstract: The present invention sets forth an improved cell type filter cartridge in which the individual cells contain a separator disc having stiffening members formed at the central aperture of the cell and connected to a plurality of the separating ribs in spaced relation to each other. The coaction of the two or more discs with the separator ribs provides for a rigid, box-like structure of the ribs to impart a substantial cantilevered strength to the ribs. Additionally, at least one of the stiffening discs is positioned at or near the ends of the separator ribs to act as a load-bearing surface to prevent media intrusion of the filtering medium and thereby maintain the area of the flow path of the filtered liquid as it passes through the central aperture of the disc.

Abstract: A membrane bag, a winding module and a method of making the membrane bag and winding module. The membrane bag and winding module comprise two separation membranes interconnected at their rims and having supply and drain conduits. The membrane bag and winding module are pressure tight and operationally safe at high pressures and temperatures. The rims of the separation membranes are flanged-in at least twice and glue layers are provided between superposed flange rims.

Abstract: A rotating disc filter consists of disc sectors of preferably rustfree or acidproof steel about a filter shaft (9). Saddles (12) of a folded plate (1) form sector deck and support for filter cloth (4), and the troughs (13) of the folded plate together with the filter cloth abutting the saddles (12) form internal filtrate channels (11) extending from the outer periphery of the sector towards the filter shaft (9). Such a construction renders it possible to obtain sectors combining the requirements of large open filter cloth area, small internal volume affording for the filter operation an advantageously great ratio between filter surface and internal filtrate volume, high stability against lateral forces, and simple manufacture.

Abstract: A filter assembly especially suitable for filtering swimming pool water includes an upright tank, and a flexible, cylindrical porous filter bag supported on star shaped core elements which are vertically spaced along a perforated outlet tube fixed centrally within the tank. Water normally flows through a filter media such as diatomaceous earth caked on the outside of the bag into the central tube and out of the tank back to the pool. When the bag becomes clogged by dirt trapped on the outer face of the filter cake, water flow is reversed for a short period of time to expand the bag suddenly and thereby release the dirt. The bag and filter media are regenerated periodically in this fashion to prolong the effective performance life of the filter.

Abstract: A disc-shaped stainless steel filter element including filter media formed from air-laid randomly disposed sintered fibers secured to a hub. The filter media includes opposed sheets of the fibers having perforated plate means therebetween to allow flow from the outside in. The plate means and the fiber sheets are welded together at the outer periphery thereof and the fiber sheets are welded at their inner periphery to the hub.

Abstract: An improved fluid filter element and a filter medium therefor include a rigid core having a coupling member attached at each end for absorbing axial stress. A filter medium includes a plurality of pockets and first and second neck portions sealingly attached to said coupling member.

Abstract: A fluid filtering device in various embodiments is disclosed. The filter includes, in one embodiment, alternating layers (34', 36') of corrugated filter media which are rolled together and sealed at alternate ends by sealant (38, 42) forming longitudinal flutes and transverse inter-flute passageways. Further embodiments disclose filter packs (112, 212, 312) of alternating layers of oppositely oriented corrugated filter media. In one embodiment, flutes of successive layers are aligned in parallel. In an alternate embodiment flutes are aligned orthogonally. Unfiltered fluids enter tubular passages (44) for example, and must exit by adjacent passages either above, below or beside the flute of entry to exit the filter. Filtering occurs when the fluid crosses a sidewall of filter media.

Abstract: A fluid filtering device comprising a housing having an open top and defining an interior chamber while an inlet and an outlet on the housing are open to the chamber. A filter bag is removably insertable into the chamber through the open top of the housing and to a filtering position in which the filter element is positioned in between the inlet and the outlet. A rim around the outer periphery of the filter bag engages an inwardly extending flange formed on the housing to secure the filter bag to the housing. A cover is movable with respect to the housing between an open and a closed position so that in its closed position, the cover closes the open top of the housing. A tubular element is secured to the cover which engages the filter bag and pushes the filter bag away from the open top of the housing and to its filtering position as the cover is moved to its closed position.

Abstract: A filter assembly is provided comprising a housing; a fluid inlet and a fluid outlet in the housing, each opening into a fluid chamber; and, disposed in the fluid chamber across the line of fluid flow from the inlet to the outlet so that all flow from the fluid inlet to the fluid outlet must pass therethrough, a filter element composite comprising a filter sheet material sandwiched between layers of foraminous spacer sheet material. The filter element composite has an upstream side and a downstream side and separates the chamber into a first portion on one side of the filter element composite communicating with the fluid inlet, and a second portion on the other side of the filter element composite communicating with the fluid outlet.

Abstract: The instant invention relates to an improved filtering device adapted to eliminate any risk of clogging of the filtering material. The invention provides a filtering device for treating any effluents, which comprises a plurality of filtering walls arranged successively between a chamber containing the effluent to be filtered and a chamber containing the filtered effluent, each filtering wall being constituted by spacedly justaposed strips having a trapezoidal section with the large base of the trapezoid located on the inlet face of the filtering wall, said strips being separated from each other, on the inlet face of the filtering wall, by intervals of equal widths forming slots which define effluent inlet areas, the sum of said inlet areas constituting the total inlet area of a filtering wall, and the total inlet area of the upstream wall being less than the total inlet area of the adjacent downstream wall.

Abstract: A fluid filtering device in various embodiments is disclosed. The filter includes, in one embodiment, alternating layers (34, 36) of flat and corrugated filter media which are rolled together and sealed at alternate ends by sealant (38, 42). Further embodiments disclose filter packs (112, 212, 312) of alternating layers of flat and corrugated filter media. In one embodiment, corrugations of successive layers are aligned in parallel. In an alternate embodiment corrugations are aligned orthogonally. Unfiltered fluids enter tubular passages (44) for example, and must exit by adjacent passages either above, below or beside the flute of entry to exit the filter. Filtering occurs when the fluid crosses a sidewall of filter media.

Abstract: A cartridge-type oil-filtering assembly comprises two coaxially nested tubular filter elements of star-shaped cross-section consisting of undulating sheet material of fine and super-fine porosity, respectively, each filter element defining an annular array of generally triangular compartments. Respective compartments of the fine and the super-fine filter element communicate with each other through the pores of the super-fine filter element as well as through individual bypasses of relatively reduced cross-section; these bypasses may be formed by channels extending within annular face plates of the cartridge or by apertures in the undulation peaks of the super-fine filter element.

Abstract: A device for mass transfer between fluids through a diaphragm unit comprising a pair of diaphragms with a diaphragm support therebetween, in which the diaphragm unit is a pleated package supported in a case, with the pleats and support defining a plurality of separate flow paths, and the diaphragm unit is shaped in a direction transverse to the longitudinal axis of the pleats with a zig zag or sine-wave shape, so that a compound zig zag or sine-wave shape results for the unit.

Abstract: A water filter for radiators is provided which is characterized by the fact that it is fitted with a thick internal cylindrical mesh inserted into another cylindrical mesh similar to the foregoing but with a finer mesh. Both meshes are fixed by supports placed by pressure between both means and a coupling flange.

Abstract: A filter cartridge for a liquid-straining filter assembly designed for a radial flow-through, the cartridge having a coiled filter body which surrounds a perforated central sleeve and is axially confined between end discs, the coiled filter body consisting of overlying layers of two axially offset strips of creped filter paper, the protruding spiral edges of the two coiled strips being glued to the end discs, while the recessed opposite edges form bypass flow gaps interconnecting the axial channel portions between the creped paper layers to form a zigzag-shaped transverse flow channel for depth-filtering action, when the entry layers of the cartridge become clogged.

Abstract: Filter frame (1), intended to be inserted in filter cloths of flexible materials shaped as bags, which bags during filtration are percolated by the treated fluid from the outside and inwards, the frame comprising two perforated and corrugated plates (2) placed against each other so that the ridges of one plate are in contact with the valleys of the other plate and linear contact between the plates is formed and between which lines and the surfaces of the plates channels for the filtrate are formed and an outlet (5) for collecting the filtrate, whereby the outlet opens out into one of the channels. The perforations are, in order to obtain a good flexibility and separating effect, formed as holes in a net of expanded metal.

Abstract: Apparatus for mass transfer between fluids, comprises two permeable membranes with a porous membrane support sandwiched therebetween, all pleated together with an accordian pleat to form a pleat package, and sealed in a casing to define three flow channels from one end of the casing to the other, to form a filter having a large filter area in a minimum amount of space for use as a dialyzer or as an ultrafilter in the treatment of blood. By selection of different membrane materials, the apparatus may also be used for oxygenation of blood, and three different fluids, including both gases and liquids, may be treated.

Abstract: An improved filter element assembly for use in an air cleaner on an internal combustion engine comprises a perforated liner. A replaceable filter element comprising a pleated filter medium is releasably coupled to the liner. A safety sleeve assembly is interposed between the filter medium and the liner. An outer liner surrounds the filter medium and exerts a radially inward force thereon to bias the pleats into engagement with the liner. The filter element assembly can be reconditioned when the filter medium becomes used with a replacement kit which includes a new filter element, safety sleeve assembly, and outer liner. The used filter element assembly is disassembled and the worn components thereof replaced with the new components of the kit. The filter medium is expandable from a collapsed cylindrical form in which the filter element is shipped to an expanded conical form for use during filtering operations.

Abstract: A consumer rebuildable filter cartridge for mounting in a fluid filter chamber in a fluid flow path includes inner and outer perforated tubular members mounted coaxially on a fixed end cap to form an annular chamber. A filter element of pleated sheet filter material is formed in a tubular construction and fitted into the annular space defined between the inner and outer tubular members and is sealed at each end by suitable resilient seal washers, compressed between the fixed end cap and a movable end cap. The inner and outer tubular members forms support structure for supporting the tubular paper filter element and permits the removal and replacement of such filter elements.

Abstract: A wrapped coil-type permeation device wherein the support material has integrally formed therein thickened side strips and end areas suitable for creating a winding core upon which membrane and support material windings are layered and/or an outer covering or casing for the wound coil device. The support material end areas include interlocking portions and fluid ports.

Abstract: A corrugated tubular filter element is provided, resistant to corrugation collapse under high differential pressure, although formed of filter sheet material susceptible to such collapse, comprising, in combination, filter sheet material enclosed in a dual layer of more open foraminous sheet material and formed in a closed corrugated configuration having axial corrugation folds arranged in groups with adjacent side surfaces in supporting contact with each other; and, interposed between said groups, solid wedge support elements extending axially of the corrugation folds from end to end of the element having side surfaces in supporting contact with external side surfaces of the end folds of each group, substantially filling the spaces between the end folds of adjacent groups, and confining the folds of each group in substantially parallel array against lateral movement; and a foraminous support sheath disposed at least one of externally and internally of the filter sheet material in supporting contact with adja

Abstract: An improved fluid filter element and a filter medium therefor include a rigid core having a coupling member attached at each end for absorbing axial stress. A filter medium includes a plurality of pockets and first and second neck portions sealingly attached to said coupling member.