Abstract: A cross flow filter apparatus and method uses an open tank having a first liquid retaining section, a second filter retaining section and a third solids collecting section in fluid communication with each other. A filter assembly is retained within the second section and includes a filter panel having a generally vertically disposed filter membrane surface, preferably with submicron pores. Filtrate is removed by applying low vacuum pressure, in the range of about 5 inches vacuum pressure (Mercury), in communication with the filter panel such that filtrate is drawn through the pores of the filter membrane surface at a flow rate Q.sub.out. Fluid to be filtered is cross flowing vertically downward across the filter membrane surface at a flow rate Q.sub.x, such that the horizontal velocity V.sub.h of fluid drawn through the filter membrane surface is less than the vertical velocity V.sub.v of the cross flowing unfiltered fluid.

Abstract: A process and apparatus for the separation and purification of cellulose ethers and other cellulose derivatives in a filter unit at relatively high temperatures and with narrow-mesh filters, employing a pressure vessel having candle filters to which pressure is introduced for separation of the suspension liquid, for the removal of residual liquid from the filter cake formed, and also for washing the filter cake.

Abstract: A coffee filter paper retainer which comprises a retaining member adapted to fit within the coffee filter paper in the coffee basket of a conventional automatic drip coffee maker. The retaining member is sized and shaped so that during use the coffee filter paper is sandwiched between the retaining member and the inside of the coffee basket, thereby preventing the coffee filter paper from drooping to the point that the coffee grounds spill out of the coffee filter paper into the coffee pot while the coffee maker is brewing the coffee. The retaining member can be sized and shaped to fit the coffee basket of any particular coffee maker. The coffee filter paper retainer may also further comprise a plurality of legs which extend downwardly from the retaining member.

Abstract: A construction of filter sock which has a panel (1) with two leaves (2,3) of unequal width such that when folded along a foldline (4) the leaves form a double leaf panel with a projecting side (9). The side (9) is folded back along a second fold line (11) over the free side (6) of leaf (2). The sides (6,9) and leaf (2) are secured together by an overlock stitching (13) to form a tube (12). The invention provides a method of making the filter sock.

Abstract: A liquid filtration system is provided which includes a traveling bridge device mounting and backwash means for successively cleaning each of a plurality of filter cells formed in a filtration tank. Both surface wash and backwash means are included in a single hood structure adapted to sealingly engage each filter cell, successively, as the traveling bridge carriage traverses the tank. The surface wash means includes a surface wash conduit for supplying liquid under pressure to the upper surface layer of each cell. The backwash means includes a backwash conduit for creating suction within each filter cell.

Abstract: A filter vessel including a vessel body having a bottom outlet opening; a carrying handle mounted on the vessel body; a closing rod extending alongside the vessel body and being longitudinally movably supported thereby between first and second positions; a valve mounted on the closing rod for maintaining the outlet opening open or closed in the respective first or second position of the closing rod; a spring urging the closing rod into the first position; an engagement face carried on the closing rod; an operating lever pivotally supported by the vessel body in an upper zone of the carrying handle and having a depressed position and a raised position; and a clamping cam carried by the operating lever. The clamping cam is in contact with the engagement face and displaces the closing rod toward the second position upon manual movement of the operating lever into the depressed position.

Abstract: An apparatus for filtering a liquid, includes supplying a starting liquid from a container to a passage of a pipe-like filter set in a filter casing, passing the starting liquid through the passage of the filter thereby to produce the filtrate, sending back the unfiltered liquid to the container, and back washing the filter by means of a hydraulic pressure device having a piston movable in a cylinder in such a manner that the filtrate is moved by the piston of the hydraulic device.

Abstract: A drum filter is disclosed in which a filter media layer is applied over a section of a drum member disposed in a tank which receives a liquid to be filtered, the filter media layer constructed of a thin metal with a pattern of holes formed by chemical etching, with the diameters thereof increasing in the direction of flow. The diverging hole shape reduces the tendency for plugging of the hole. One or more scraper blades are urged against the filter media layer which is rotated past the scraper blade causing a flexing of each section of the filter media layer to unplug any holes which do become clogged.

Abstract: An end-cap for a filter cartridge is formed by melting the thermoplastic material of a supporting cage and of a support pleated together with the filter medium against a heated die and embedding the end of the filter medium in the material while it is molten. Extra thermoplastic material may be melted in the die. If all of the components of the cartridge are thermolplastic, then they all fuse together and contribute to the end-cap.

Abstract: A filtering system for water treatment including a head member having inlet and outlet ports and replaceable, disposable filter cartridge for insertion into the head member, the filter cartridge including a dual lug retaining system for retaining the filter cartridge in the head member, one of said lug retaining systems being disposed on the pressure vessel of the filter cartridge and the other of said lug retaining systems being disposed on the closure member of the filter cartridge.

Abstract: The filtering apparatus comprises at least one filtering material pleated in fanfold formation and arranged between the inflow or upstream side and the outflow or downstream side. Each pleat open toward the inflow or upstream side possesses a rounded base. The radius of the rounded base is in the range of 0.05 to 0.3 times the pleat depth. Each pleat open toward the outflow or downstream side terminates in an acute angle. A dimensionally stable insert is positioned within each pleat which is open toward the outflow or downstream side. The insert is preferably formed of flat material and comprises bilaterally protuberant deformations. The inserts are provided with bores at least at the protuberant deformations. Each of the inserts space the two confronting downstream sides of the associated filtering pleat and prevent that the filtering material, at high-pressure conditions, is pressed together and becomes impervious at the locations pressed against the inserts.

Abstract: A filter for a fluid under pressure comprising a container including a filter vessel (1) and cover (2) for clamping against the filter vessel. A support basket (12) adapted to be inserted into the filter vessel includes a flange (11) having an inwardly and upwardly open profile (15, 16). A filter sealing element (18) of an annular filter bag carrier (17) may be inserted into the open profile (15). In order to obtain a complete sealing effect, particularly against the passage of the unfiltered fluid into the filtered fluid in the filter, an upwardly and outwardly open groove (19) is provided in the profiled filter sealing element (18), which groove receives an inner O ring (20).

Abstract: A filtering device includes a head intended to be permanently installed in a fluid dispensing machine and a disposable canister therefor. A central chamber is formed in the head which chamber is in communication with an inlet port and an outlet port for receiving an unfiltered liquid and supplying a filtered liquid, respectively. The disposable canister has a flask shaped main body with a flat top and a neck of substantially uniform diameter on the top. The neck fits in the central chamber. A tube extending through the neck defines an annular clearance between the tube and the interior of the neck which annular clearance is in fluid communication with the inlet port. The opening into the tube located at the top of the neck is in fluid communication with the outlet port in the head. A pair of tab receptacle on the head and a complementary pair of tabs on the canister are engageable with one another by 1/4 rotation of the canister to lock the canister to the head.

Abstract: The invention relates to a filter for cleaning lubricating oil, especially for internal combustion engines of motor vehicles, with a filter case which, when installed, is in an at least approximately upright position. It has a cylinder-shaped oil filter cartridge and an inlet for the dirty oil flowing through the filter cartridge, plus an outlet for clean oil connected to the central interior part of the filter case and situated in a base at the bottom end of the filter case. A drain passage at the bottom end of the filter case becomes connected to the inlet chamber of the filter case whenever the filter cartridge is removed, plus a closure which cuts the drain passage off from the filter case.

Abstract: A strainer assembly for straining a liquid such as paint to be poured into the interior of an open top container includes a tubular strainer support having a continuous imperforate side wall structure with an open top, an open bottom, and an annular exterior flange for removably resting on the open top of the container for holding the strainer support in an upright position above the container. A filtering medium secured to the open top of the strainer support includes, in one ebmodiment, a thin, flexible tubular imperforate plastic sheet having an open top which is taped to the upper exterior portion of the strainer support. The flexible plastic sheet extends downwardly for most of the distance into the interior of the strainer support. A flexible mesh filtering cloth secured to the bottom of the tubular plastic sheet extends across a major portion of the projected area of the strainer support interior adjacent the top of the container.

Abstract: A device for the production of ultrapure water comprising tubes containing water treatment elements joined by two end plates. Grids are disposed between the tubes and the end plates to retain resin or carbon particles. Connector terminations provide a hydraulic connection between a control unit and the tubes. The filter is mounted in the tubes by means of an adapter which also provides a seal between inlet and outlet sides of the filter. Holes are provided in the connector terminations and the end plates to enable selection of the path of fluid in the water treatment elements.

Abstract: A horizontally mounted cylindrical container is adapted to mount through demountable end plates a cartridge filter in the container through demountable end plates for rotation around a lower axis than the center axis of the container. The combination of container and filter is connected in an aqueous system through a top inlet pipe and hand controlled valve and a lower front end plate outlet, and to a source of pressure cleaning media through an upper quadrant valve controlled turnable tube slidably mounted through a rear plate inlet and supported in the container by a combination track and baffle member fixed to the container top. A nozzle fixed to the free end of the pressure media tube jets cleaning media against the filter to rotate it alternately in both directions of rotation and for its full length. A second inlet pipe and valve is fixed to the top inlet pipe a chemical cleaning soak in baffled minimum amounts because of the baffling and filter mounting below the center of the container.

Abstract: A filter element is formed by spirally winding at least two layers of filter material about a central, perforate supporting core. The layers include a relatively fine porous filter material and a relatively coarse porous filter material. The layers may be formed from blankets of material, or one or both layers may be pleated. The fine filter material extends beyond the edge of the coarse filter material to overlie and close the longitudinal ends of the layers of the coarse material. Fluid to be filtered passes radially through the element until it encounters a clogged or plugged area. The fluid will then take a circumferential spiral route until it again finds an open area of the filter and can pass radially toward the core.

Abstract: A liquid filter includes a filtering medium of a collapsed cylindrical form which defines cooperating accordian pleats that form contaminant collecting walls. The medium is self-supporting, and divides the filter into inlet and outlet chambers across the medium. When the restriction of the medium increases, thereby increasing the pressure differential across the medium, the accordian pleats collapse until corrugations on the pleats engage with one another, thereby resisting further collapse of the medium. As the pressure differential increases still further to the extent that the corrugations are collapsed, a part of each fold is kept apart by adjacent double thickness portion of the fold or pleat, so that a minimum flow of liquid through the filter is maintained.

Abstract: An oil filtering apparatus includes a check valve at the bottom of and within a cylindrical porous filter unit, to pass oil directly into an oil tank in case of clogging of the filter unit or cartridge. Channeling in the check valve inverted cap by-passes flow around the valve within the cap, when the valve is depressed; and a well formed around the cap collects dirt and other particles, within the filter unit lower interior.