Abstract: A method and apparatus for a filter assembly having a filter element with a plurality of openings encapsulated in a filter element carrier in a first molding operation, which may include formation of first and second channels on first and second side portions of the filter element carrier. One or more first holes are also formed through the filter element carrier in the first operation, wherein the first holes interconnect the first side portion of the filter element carrier and the second side portion of the filter element carrier so as to expose filter element portions encapsulated therebetween. A first sealing element is formed on the first side portion of the filter element and a second sealing element is formed on the second side portion of the filter element with a molten sealing element material in a second molding operation.

Abstract: It is a solenoid valve used in hydraulic control. Inside a body 4, a clip plate 11 is provided at the side of an inlet 5. The clip plate 11 is formed integral by a circular support portion 12 and three retaining pawls 13 extending toward its center. On the other hand, a filter 21 of synthetic resin is formed integral by an outer frame portion 22 encircling the inlet 5, an inner frame portion 23 bisecting it and filter portions stretched therebetween. Further, a retaining convex portion 25 projecting toward the inlet 5 is provided at an intermediate portion of the inner frame portion 23. The inner frame portion 23 is elastically deformed to move the retaining convex portion 25 toward the side of the inlet 5 so that it is retained by the three retaining pawls 13 of the clip plate 11. The shape can be achieved wherein the filter 21 does not project so much from the body so that the overall size of the solenoid valve can be reduced.

Abstract: A pleated filter medium arrangement including a sheet of pleated porous filtering media nestingly engaged between adjacent pleats by a pleated sheet of thermobondable plastic screening with preselected facing opposite portions of the screening being heat bonded together.

Abstract: A filter element has a support member with a support tube which can abut a filter mat and which is provided with apertures for the passage of a filtered medium. The apertures are formed by the axial spaces between individual rings of the support member. The rings are supported by support walls dividing the interior of the support tube into individual chambers. Since the support member is rendered compression-stiff, it exclusively supports the filter mat when the medium flows through. The respective support wall is directly connected to the rings. Each ring with its closed annular shape surrounds the support walls on the exterior. The filtration capacity of filter elements can be improved and the weight and cost simultaneously reduced owing to the highly stable and compression-stiff support member.

Abstract: A filter sleeve (26) surrounds a rod-shaped, flexible drain core with flow paths for removing a pressed-out liquid from the pressing chamber of a press. For mounting one or both ends of the filter sleeve (26) and the drain core on the press, a rubber or elastically deformable shaped element (29) with a ring-like bead (22) is firmly connected with the filter sleeve (26) at its end. The shaped element (29) inseparably penetrates the fabric of the filter sleeve (26) because of an elastomer coating, and the bead (22) is automatically positioned in a groove (24) of a support body (23) because of its previous stretching.

Abstract: A filter is provided for use with an in-tank fuel pump for an internal combustion engine. The filter is disposed within a fuel tank and includes a main filtration chamber connected to an inlet of the fuel pump and a return fuel chamber connected to the engine for introducing thereto return fuel from the engine. The main filtration chamber has an upper side peripheral wall formed from a meshed filter medium. The return fuel chamber is connected to the main filtration chamber in such a manner that the upper side peripheral wall of the main filtration chamber serves as a partition wall between the main filtration chamber and the return fuel chamber. In one embodiment, the return fuel chamber has a peripheral wall formed from sheet or plate impermeable to fluid.

Abstract: A water filtration system for preventing a Zebra Mussel from entering a water system having a water intake line extending into an aquatic environment exposed to Zebra Mussels. The system contains an intake line connection for connecting the filtration system to the intake line; at least one water collection line extending from the intake line connection; a water intake line which is disposed sub-statantially parallel to the water collection line and which contains an orifice with a top surface and a copper screen recessed at least about 2.5 inches from the top surface; a first water filter and a second water filter, wherein each of these filters has a largest pore size that is small enough to prevent passage of an egg or veliger of Zebra Mussels; a a copper screen surrounding each of the first water filter and said second water filter; and a housing surrounding each of the water filters and including a first filter intake and a second filter intake.

Abstract: A screen assembly for a vibratory screening machine including a frame in the nature of a plate having spaced apertures therein, spaced frame members on opposite sides of the apertures, a screen formed in an undulating shape having substantially parallel ridges with downwardly sloping sides, troughs formed between the downwardly sloping sides for conducting material which is being screened, undersides on the troughs, bonds for securing the undersides of the troughs to the spaced frame members which are located on opposite sides of the apertures, and channels at the sides of the plate for securing the frame to a vibratory screening machine.

Abstract: A screen cylinder, screen, method of manufacture of the screen cylinder, and method of use of the screen cylinder, allow screen capacity to be maximized without sacrificing screen cylinder strength, and while achieving a clean accepts flow. A screen cylinder is constructed in a conventional manner except that at least one reinforcing ring is permanently fastened (typically by continuous or spot laser or electric beam welding, or direct resistance welding) to at least a majority of (and typically essentially all of) the land areas which separate grooves in a row from each other, at the outlet surface of the cylinder. The welds each typically have a width of about 1 to 3 mm (that is they are very small), but that width is typically at least about 75% of the width of a land area in which it is formed, and the weld has a length of at least about 50% of the width of the reinforcing ring at the weld.

Abstract: A rechargeable filter comprises first and second spaced particle-retaining meshes in which the first mesh (64) is continuous and forms a series of "V" shapes, and the second mesh comprises a number of closed "V"-shaped mesh elements (68), each second mesh element projecting into one "V" of the first mesh. The meshes are spaced at a constant distance by rigid projections (70) which also laterally space the upper parts (72) of the second mesh elements so that particles of filter material (74) can be loaded and unloaded.

Abstract: A portable vacuum loadable liquid-solid separator tank having a bed with a drain, surrounding sides and a dividing wall. A grate overlays the interior of the vessel, bed, and sides, and forms the dividing wall. A filter overlays the grate, extending up the sides and covering the top and the dividing wall. The separator is filled with a sludge which is then separated from the liquid it contains by gravity and hydrostatic pressure which force the liquid through the filter. Liquid is drained out of the bottom of the vessel and the solids are transported within the vessel. The solids are removed through a gate that may be provided in the tank, or by using a hydraulic lift system in much the same manner as a garbage truck empties a municipal dumpster. The filter is removed with the solids and usually discarded.

Abstract: A water filter of stainless steel material is intended for use in a drinking water machine and is composed of a plurality of hollow filtration cylinders and hollow support cylinders. The filtration cylinders are different in diameter and have a minutely perforated periphery capable of separating solid particles and impurities from water. The support cylinders are different in diameter and are provided respectively with a periphery having a plurality of through holes. The support cylinders are dimensioned differently such that they can be fitted into one another, and that they can be fitted into the filtration cylinders, and further that one of the support cylinders is smallest in diameter and is provided at the top end thereof with a threaded portion engageable with a nut for fastening the filtration cylinders and the support cylinders together securely.

Abstract: A new type of filter assembly which can be employed to retrofit an existing shaker or which can be built as an integral part of a new shaker. The assembly is comprised of a series of compartments arranged in cascading fashion within the shaker. Each compartment is provided with a removable hookless corrugated filter having no additional support backing which secures between a perforated bottom of the compartment and a removable and reclosable lid. Each filter is sealed and supported from below, at its front and rear edges and along its sides within its respective compartment upon removable corrugated lips provided in each of the compartments. Each lid is provided with a plurality of downwardly extending parallel blades which coincide with and engage valleys of the corrugated filters to seal and support the filters within their respective compartments when the lids are closed.

Abstract: A portable, self-contained concrete reclaimer for use at construction sites to collect, break-down, and transport uncured waste concrete washed from concrete delivery equipment, to recycling facilities for use in the manufacture of fresh concrete. The concrete reclaimer comprises a screen having openings sized to separate aggregate from sand, cement and water when uncured waste concrete is washed thereon. The screen being sized to cover a portion of a water tight reclaiming tank having an open top, a closed wall, a bottom continuously sealed to the closed wall, and an upwardly extending partition disposed therein to divide the reclaiming tank into at least two separate, adjacently disposed compartments including a first receiving compartment adapted to receive and contain sand, cement and water, and an adjacent second receiving compartment adapted to receive and contain aggregate separated therefrom during the concrete washing and reclaiming procedure.

Abstract: A selectively removable sludge filtration system that provides for retrofit into a container and separation of the sludge solids from the sludge liquids therein. A pair of spaced vertically oriented filter assemblies each define a filtrate cavity therein and are connected by separator plates. The filter assemblies permit the flow of sludge liquids into the filtrate cavity, but not sludge solids. A set of fasteners hold the filter assemblies in the container and bias the filter assemblies against the container bottom. The fasteners may be released to provide for removal of the sludge filtration system from the container. A fluid communication passageway directs filtrate from the filtrate cavity to a position exterior of the container. Functionally applying this sludge filtration system provides a method of retrofitting a container with a sludge filtration system and removing filtrate from a sludge in the container.

Abstract: An in-tank fuel filter for securement to an in-tank fuel pump assembly includes a retaining or mounting ring which is utilized to secure the filter to the fuel pump assembly inlet. The mounting ring includes a collar which is received about the outlet stack of the fuel filter assembly and assists retention of the fuel filter assembly on the fuel pump inlet and maintains a fluid tight seal notwithstanding dimensional changes of the outlet stack occasioned by long term contact with fuel. The fuel pump assembly also includes a depending lug parallel to but offset from the inlet fitting. The mounting ring also includes complementary means to receive and grip the lug, namely, a plurality of resilient fingers arranged in a non-circular, i.e., elongate pattern such as an oval which compensates for inlet fitting to lug spacing variations and retains the fuel filter on the fuel pump assembly during subsequent manufacturing and assembly steps.

Abstract: A damage-resistant filter for use in subterranean wells has at least one layer of a filter medium, such as a sintered supported porous membrane, coaxially disposed about a perforated support member. The filter may also include a drainage layer disposed between the inner support member and the filter medium, and a protective covering, such as a perforated cage, surrounding the filter medium. The filter is particularly suitable for removal of sand and other particulates from fluids produced in a well.

Abstract: A fluid filter cartridge is disclosed herein. The filter cartridge includes a generally tubular casing closed at one end and having at the opposite, open end, an annular member defining a filter element receiving aperture and provided with a single seal extending circumferentially of the casing and projecting axially away from the casing. The filter element includes a base ring and a generally tubular filter screen extending from the base ring to an end closure therefor. The base ring and tubular filter screen are dimensioned to fit within the filter receiving aperture. A removable connection is provided between the annular member and the base ring whereby the filter element is removably retained in the casing after rotation of the filter element about its axis relative to the axis of the casing.

Abstract: In a fuel filter disposed in a fuel tank for automobiles, a filter cloth is prevented from being damaged or broken so as to maintain the filtering property stably for a long period of time. The fuel filter disposed in a fuel tank for automobiles has a frame body for swelling the filter cloth wherein outer surfaces of the frame body arc gently at the portion where the frame body contacts the filter cloth, whereby the filter cloth is prevented from being damaged or broken even if the filter cloth repeatedly contacts the frame body.

Abstract: Filter apparatus for filtering contaminants from a fluid, such as machine tool coolant, are disclosed. One filter apparatus includes a filter drum unit having a generally cylindrical open perforated support sheet with a cylindrical screen element mounted thereabout. Circumference varying mechanisms, such as turnbuckles, are connected relative to the support plate to vary the circumference of the support plate and the tautness of the screen element. A disc filter assembly having a mandrel and fluidly attached annular disc filter elements is also described. Each annular disc filter element has an inner structure with concentric ribs forming concentric grooves therebetween which are connected to radially extending grooves. A screen element is supported by the ribs so that the microscreen will not tear while allowing filtering of fluid into the grooves which are in fluid communication with the mandrel.

Abstract: A screening screen assembly for a vibratory screening machine includes a substantially planar apertured plate and an undulating subassembly of a support screen and a fine screening screen having ridges and troughs. A fused plastic grid bonds the fine screening screen to the support screen at spaced locations while leaving unobstructed portions of the screens therebetween. The undersides on the troughs are bonded to the apertured plate. The fused plastic grid includes first portions extending substantially perpendicularly to the length dimension of the ridges and throughout the major portion of the sides of the ridges and also includes second portions which extend transversely of the first portions and extend through spaced portions of the troughs while leaving unobstructed portions of the troughs therebetween.

Abstract: A filter is provided which combines a woven wire mesh over a supporting body. The supporting body is typically a metal perforated tube which provides fluid communication between the well bore and the production equipment string. The woven wire mesh acts as a filter to prevent the influx of sand particles, provides openings oriented at various angles relative to its surface, so that some area is available for fluid entry even when particulate matter is lodged on the surface above an opening, provides interior channels that allow fluid to travel from one location on the mesh surface to another location over an opening into the supporting body, and does not provide "straight-through" openings, thus forcing the fluid to make multiple turns to pass through the mesh, thereby dissipating the fluid's energy and increases the mesh's erosion resistance. When particulate matter accumulates on the mesh's surface, the resulting particle cake remains porous, heightening the filter's resistance to plugging.

Abstract: A sand-filtering screen-making technique and screen are disclosed, which involves an initial assembly of the sand-filtering screen over an underlying coarse screen. The sand-filtering screen has a mechanical, longitudinal overlap-type joint. End caps are fitted over the filtering screen which has already been preassembled to the underlying coarse screen. The assembly is then mechanically forced through a die to compress the end caps onto the assembled filtering screen and underlying coarse screen. That subassembly is then assembled onto a base pipe and secured. An outer shroud can then be secured to the underlying base pipe, overlaying the filtering screen. The ends of the subassembly comprising the filtering screen and the underlying coarse screen are sealed against the support pipe by a packing gland arrangement at both ends.

Abstract: A disposable device for filtration and collection of blood during a surgical operation, which device comprises a housing with a cup-shaped portion, in which a wall section is forming a ledge in the reservoir inside the housing. A first self-supporting filtration element for venuous blood is upstanding from the ledge, and a second filtration element for cardiotomy blood is suspended from the cover, the two elements being arranged side by side in a parallel relationship. The filter elements have an elongate, oval cross-section.

Abstract: The invention is a filtering device for the drilled passage in on-off control valves used in aircraft liquid crop spraying systems. The device is mounted within the on-off control valve in the spray boom supply line at the opening of the drilled passage which connects the low pressure area of the suck back venturi to the spray boom supply line. In the "two-part" and "four-part" configuration of the device, it is composed of a small gauge wire mesh sleeve inside a perforated cylinder with raised collars on both ends. The collars secure and align the device in the on-off control valve assembly. The collars may be machined in one piece with the perforated cylinder (the "two-part" configuration) or machined separately and fitted onto the ends of the perforated cylinder (the "four-part" configuration).

Abstract: A blood filtration device encapsulates a filter pad assembly Within a flexible housing. The filter pad assembly includes first and second filter media layers. A first heat and pressure sealed region integrally bonds the peripheries of the first and second media layers together. The flexible housing comprises a peripheral rim aligned with the first heat and pressure sealed region of the first media layer. A second heat and pressure sealed region, formed after the first heat and pressure sealed region, joins the rim of the flexible housing to the first heat and pressure sealed region, thereby forming a composite seal that encapsulates the filter pad assembly within the housing.

Abstract: A suitable liquid-solid separator tank having a bed with a drain, surrounding sides and a dividing wall. A grate overlays the interior of the vessel, bed, and sides, and forms the dividing wall. A filter overlays the grate, extending up the sides and overlapping the side grate and covering the dividing wall. The separator is filled with a sludge which is then separated from the liquid it contains by gravity and hydrostatic pressure which force the liquid through the filter. Liquid is drained out of the bottom of the vessel and the solids are transported within the vessel. The solids are removed through a gate that may be provided in the tank, or by using a hydraulic lift system in much the same manner as a garbage truck empties a municipal dumpster. The filter is removed with the solids and usually discarded.

Abstract: The invention relates to a method of manufacturing a screen product and to a screen product manufactured according to the method. In particular, the invention relates to the manufacture of a screen or a filter plate or a cylinder by a new machining method by which a product receives flow properties substantially better than the ones of the prior art devices. It is characteristic of the invention that an aperture having curved wall surfaces is machined in one work phase in the plate in the depth direction. It is characteristic of the screen product of the invention that the screening aperture is progressively widened in the direction of the flow through the plate, and preferably inclined under the ridge adjacent the groove in a plate.

Abstract: A filter is provided for use with an in-tank fuel pump for an internal combustion engine. The filter is disposed within a fuel tank and includes a main filtration chamber connected to an inlet of the fuel pump and a return fuel chamber connected to the engine for introducing thereto return fuel from the engine. The main filtration chamber has an upper side peripheral wall formed from a meshed filter medium. The return fuel chamber is connected to the main filtration chamber in such a manner that the upper side peripheral wall of the main filtration chamber serves as a partition wall between the main filtration chamber and the return fuel chamber. In one embodiment, the return fuel chamber has a peripheral wall formed from sheet or plate impermeable to fluid.

Abstract: A fluid filter which comprises a canister having an open end and a closed end, the canister sealing to an adapter body to prevent leakage between the canister and the adapter body, the adapter body having a plurality of angled fluid inlet ports extending through the adapter assembly body into the cavity formed by the canister and the adapter body assembly, a threaded fluid outlet port extending through the adapter body, a threaded ring adapter for adapting the outlet port to a variety of filter receptacles, a multistage wire mesh filter element having a weave which is designed to prevent fluid contaminants from passing through the filter element while inhibiting the contaminant particles from becoming lodged in the filter mesh, the fluid inlet ports in the adapter body being formed at an angle to create a tornado type turbine fluid motion within the canister to suspend contaminants which are blocked from passage through the screen in the fluid and allow such contaminants to settle in the canister out of the f

Abstract: A filter having a an outer peripheral surface comprising an accordion wire mesh and an inner peripheral surface comprising a support structure, the filter permitting a liquid composition such as paint to be filtered therethrough when connected to an airless paint spraying system. Method of using a filter.

Abstract: Located within the annular screen of the pressure diffuser is a tubular baffle hung from adjacent the top of the vessel. The baffle has two headers disposed on its inner surface, with openings in the tube providing communication between the exterior of the tube and the headers. A conduit extends from each header to an arm at the top of the vessel, to allow extracted liquid to be discharged. Another extraction conduit is provided at the bottom of the vessel, in communication with the screen interior and the tubular baffle interior. Treatment liquid, such as wash liquid, may be introduced at two, three, or more positions along the vessel with the liquid extracted from the first and second headers being introduceable at different positions along the vessel. A flexible, elastomeric material, sealing element with integral annular skirt may extend from the bottom end of the tubular baffle and engage the screen to provide a seal minimizing mixing between stages.

Abstract: Apparatus for separating waste liquid and solid material comprises an upwardly inclined passage containing an auger for conveying the solid waste material upwardly along the passage, with an inlet opening at a lower end of the passage for receiving a mixture of waste liquid and solid material into the auger, a drainage opening at the lower end of the cylindrical passage for draining liquid from the solid waste conveyed by the auger, and a compactor for receiving the solid material fed upwardly by the auger and compacting the solid waste material. An extruder receives and extrudes the compacted solid waste material from the compactor, and may be arranged to convert the compacted material into pellets.

Abstract: A filter screen structure for a backflushed liquid filter has a screen separating the raw-liquid side of the filter from the clean-liquid side thereof, including at least one row of substantially parallel rods extending along the screen, wherein the screen is threaded between the rods, partially enveloping the rods alternatingly from the raw-liquid side of the filter and from the clean-liquid side thereof. At least some of the rods are provided with substantially circumferential groove-like recesses, facilitating the passage of the liquid from the raw-liquid side via the screen to the clean-liquid side.

Abstract: Disclosed herein are improvements to a water filtration system on a water intake line that prevent the infestation of Zebra Mussels in the water system. The water filtration system filters any water entering the water intake line through a filter having a largest pore size that is small enough to prevent the passage of an eggs or veliger of Zebra Mussels. To prevent accumulation of Zebra Mussels on the filters and the filtration unit, copper screens surround the filters and the water intake to the filtration system. The filters are also provided with threaded ends to facilitate easy and reliable removal and replacement of the filters when needed.

Abstract: A novel bearing-seal for the upper journal of a rotary self-cleaning strainer allows an existing strainer whose upper journal has become too loose to be reconstructed without the necessity of replacing the suction pipe, even though the suction pipe has been grooved by a set of circumferentially spaced wheels previously used for the upper journal. The bearing-seal can also be used in a new strainer instead of such a set of wheels. Where sealing is also required, the inventive bearing-seal has a sealing disc for replacing a previously used curved lip seal. The inventive upper bearing-seal significantly reduces rotational friction, enabling the strainer to be operated with significantly increased power efficiency, offering the potential for effective usage with lower pressure suction pumps.

Abstract: A fuel injection valve has a fuel filter developed as one piece with a holding collar. The holding collar extends radially beyond the fuel inlet connection and has a nose outside the fuel inlet connection. The circumferential nose of the holding collar together with the groove on the outer circumference of the fuel inlet connection forms a detent connection by which the fuel filter is fastened in pin-pointed position. Between the base body of the fuel filter and the inner wall of the fuel inlet connection there is merely a clearance fit, so that formation of chips is avoided within the fuel injection valve. The fuel injection valve is particularly suitable for use in fuel injection systems of mixture-compressing external-ignition internal combustion engines.

Abstract: Apparatus for filtering particulates from fuel being transferred through a nozzle into a fuel tank including an annular flange member and an elongated tubular mesh filter member having a proximal end of which is attached to the flange member, providing an opening through which a fuel nozzle may be inserted into the filter member, and a distal end which is closed so that particulates of predetermined size are prevented from flowing through the tubular filter member. The tubular filter member is provided, near the proximal end thereof, with a radially outwardly projecting protuberance, permitting insertion or removal of the apparatus into or from a tank only upon contraction of the tubular filter member.

Abstract: A traveling water screen including a basket having an upper lip beam and a lower lip beam, the lower lip beam including an elongated upwardly opening channel upstream of the water screen, the lower lip beam including an upstream wall having a lower portion the lower portion including a lower forward surface facing in the upstream direction, at least a portion of the lower forward surface being convex, and the upper portion of the upstream wall having a spoiler shape for deflecting water upwardly and over the upwardly opening channel. The traveling water screen also includes seals between adjacent baskets to prevent unscreened water from flowing through spaces between the baskets.

Abstract: A filter for a synthetic resin melt has a housing formed from two blocks through which a melt channel for the passage of the plastics melt passes. A screen plate is rotatably mounted to intrude between the blocks and a plurality of recesses are distributed in a circular pattern around the periphery of the screen plate so that rotation can bring two of the recesses in to line with the channel. A plurality of filter elements are accommodated, one each in each recess, so that the plastic melt must pass through the filters in the recesses in line with the channel. To support the filter elements against melt pressure a stationary perforated plate is located in the channel immediately adjacent and downstream of the screen plate. By rotating the screen plate exhausted filter elements can be readily replaced. The filter elements are made of woven wire cloth and may be dished to prevent distortion of the mesh.

Abstract: A stationary skimming device for a swimming pool comprising: a plurality of tubular frame pipes formed in a hollow generally cylindrical configuration with two open ends, some of the pipes being positioned vertically and some being positioned horizontally in the operative orientation, each of the pipes including coupling means at their respective ends to permit attachment to an adjacent pipe, the pipes forming a generally rectangular configuration in the fully assembled orientation, the pipes having coupling devices affixed along their length, a screen being positioned between the pipes, the edges of the screens being coupled within the coupling devices along the length of the pipes, at least one of the pipes having a horizontally positioned hook extending perpendicularly therefrom, the hook including adjustable coupling means and adapted to be affixed to the edge of a swimming pool in the operative orientation.

Abstract: A fluid filter for a solenoid which includes a flexible filter element and two plastic tips for installation in an annular groove. The plastic tips are arcuate shaped to fit tightly against the outside diameter of the annular groove when the flexible filter element is wrapped around the annular groove during installation and the tips are bonded together to secure the filter to the groove.

Abstract: A screen dram for the dewatering and/or washing of cellulose pulp, comprises a first cylinder (2) made from non-stainless material, which is rotatable about its axis (5); a cylindrical screen plate (6) arranged coaxially on the outside of the first cylinder, but at a distance from it, and between the screen plate and the first cylinder an annular chamber (7) which can receive liquid which has passed through the screen plate, which chamber contains passages (26) which extend in the axial direction towards one or both ends of the drum for the withdrawal of the screen liquid. The chamber (7) is lined with stainless steel (8) in the form of one or more cylindrical plate sections (8a, 8b . . . 8n). These, by virtue of shrink joints, can be joined to and bear in seal-tight arrangement against the cylindrical casing of the first cylinder. Preferably, the stainless steel contains at least 5% molybdenum.

Abstract: A multi-layer composite screen having filters of a plurality of layers superposed one upon another is provided. Each filter of the plurality of layers has wires of a substantially triangular or trapezoidal cross section arranged in parallel to one another with a continuous slit of a substantially V-shaped cross section being formed between respective adjacent wires, said slit widening increasingly inwardly from the surface of the screen. The wires of one filter of the respective adjacent filters cross the wires of the other filter and the respective adjacent filters are fixed to each other at crossing points of the wires of the respective filters. In one aspect of the invention, the wires are formed with linear projections extending in the longitudinal direction of the wires which facilitate electrical welding of the filters of the adjacent layers.

Abstract: A filter for use in a concrete press mould, the filter comprising a fabric being knit or woven at least in part from heat meltable yarns and having a fabric density which permits the passage of water therethrough but prohibits the passage of particulate material, the filter being bounded around its periphery with at least one continuous imperforate band integrally formed with the fabric by fusion of said heat meltable yarns.

Abstract: A protective filter unit for use with a fluid seal assembly. The filter unit includes a screen positioning unit and a filter screen extending inwardly of portions of the positioning unit and terminating in an inner screen edge spaced just apart by a working clearance from a shaft forming a part of the sealed mechanism. The filter is associated in use with a seal having a seal casing which may be aligned with the screen positioning unit of the filter, and an elastomeric seal body having portions defining a seal band which engages the sealed shaft and another portion bonded to the seal casing. Preferably the screen positioning unit includes inner and outer support rings held apart by spacers, and the support rings, the spacers, and the screen are all made from plastic materials.

Abstract: A device for preventing debris from clogging downsprouts (22) and underground drain pipes (26) consisting of a cap (32), screen (26), and base (34). This device totally screens and contains the water flow. The screen (26) is easily removable by sliding the cap (32) up over the downspout (22). The amount of debris accumulation can be easily observed because either the cap (32) or base (34) is transparent.

Abstract: A reinforced net apparatus, defined by a recovery net portion and a rear bag portion, the recovery net portion including a lower body panel portion of reinforced heavy duty netting, interconnected to left and right side panels of netting, and a top body panel portion of lightweight netting, together forming a forward debris-receiving opening. The recovery net portion would be interconnected at its rear wall to a bag portion, comprising netting, for receiving the debris collected in the recovery portion, the bag portion closed off at its rearmost end, and including elephant ears for recovering the bag portion when it is filled with debris. There is further included a lead chain member across the forward floor portion of the net and a trash chain to contact the debris and help move it into the net while the net is being pulled along the bottom of the body of water by a vessel.

Abstract: Disclosed is a filter support for use as part of a screened packing, or filter system, in an extrusion process, wherein the filter support provides a rigid wall in the shape of a dome featuring flow passage holes through the wall such that the longitudinal axis of each hole is perpendicular to a plane tangent to the surface of the dome at the location of the hole.

Abstract: In a method of producing spacer elements between pairs of mutually facing membrane surfaces for a fluid purifier, to minimize the number of separate parts required in the assembly of a membrane module for the fluid purifier, the sides of mutually parallel strings of spacer material are joined with the surfaces obliquely to a longitudinal extension of the surfaces. The surfaces are turned to face one another with respective parallel strings intersecting and abutting one another.