Abstract: An air filter is provided for removing gaseous impurities from the air such as formaldehyde, acetaldehyde, acrolein, acetone and other chemical compounds. The filter utilizes a plurality of corrugated base sheets which are stacked or nestled and which have entrapped carbon dust for absorption of impurities. The corrugated structure provides very little pressure drop as the air passes through available channels and large, powerful fans are not necessary to move air therethrough.

Abstract: Filter media used for removing foreign matter from an air stream flowing therethrough, which includes a pair of first and second generally flat sheets of filtering material extending in generally parallel relation to one another with a spacing therebetween. The first and second sheets are each formed with a plurality of dimples extending, respectively, inwardly toward the other of the sheets for abutment therewith to maintain the spacing between the sheets, and the dimples in one of the sheets are spaced from one another along the extending length thereof and are also spaced from the corresponding dimples in the other sheet, with such spacing preferably being equal. Also, adjacent pairs of such filter media sheets are arranged so that the dimples in the facing surfaces of adjacent pairs are offset from one another whereby clumps of foreign matter do not tend to collect and become anchored in opposed crevices formed by the dimples.

Abstract: An apparatus and process are provided for removing particles from an air stream by filtration, particularly wood particles which have been treated with a resinous material, and which therefore are somewhat sticky. The apparatus is a filter system in which an air stream carrying the resinated particulates is directed upwardly through a set of filter elements which are arranged in a generally sawtooth pattern. The filter elements include a relatively large mesh screen to which the sticky particulates adhere and form of a filtering layer on the mesh in situ. As the filtering layer grows, its porosity is continually reduced, until it reaches a minimum acceptable level, at which time the filter elements are vibrated to cause a portion of the filtering layer to fall away, leaving a portion of the layer adhering to the filter element. In this way, continuous, high-efficiency filtering of a sticky particulate from an air stream is achieved.

Abstract: An air filtration system includes a holding frame supported by a universal mounting frame and a cartridge in the holding frame. The holding frame has a header used to permanently mount and seal the holding frame to the universal frame. The filtration cartridge fits inside the holding frame and is easily replaceable. A seal is provided between the holding frame and cartridge to assure that air passing through the system passes through the cartridge. In a preferred embodiment, the seal is provided on a flange at the back of the holding frame and another seal is provided on a cover that holds the cartridge into the holding frame.

Abstract: To permit environmentally safe incineration of a filter bag together with its holding frame, and without requiring removal of the holding frame prior to incineration, the holding frame is made of fibers or cellular pulp stock, and, in plan view, is essentially rectangular. It is formed of two folded walls which, before insertion of the folding bag, are in essentially V shape, with an outer wall (6) and an inner wall (7), the V defining a gap of between 25.degree. to 50.degree., preferably about 38.degree., between which gap the filter bag is inserted. The inner wall, at the corner, is formed with a wedge-shaped gusset (9), with folding creases (10, 11) and a crest crease (12) between the folding creases. After insertion of the filter bag, the inner wall (7) is pressed against the outer wall (6), and the gussets snapped against the inner wall, to hold the frame together.

Abstract: An extended pocket type air filter formed of a single rectangular frame enclosing and locking a plurality of parallel header plates each having complementary projections and grooves on opposite edges, the complementary projections of one header fitting into the grooves of an adjacent header and securing pocket type air filter medium between them. A rivet secures ends of the frame to each other about the header plates.

Abstract: A filter cassette having a fanfolded filter medium against which a thin wed strip is cemented on each fanfolded face by means of an edge gluing machine such that on the upstream side it projects slightly over the filter medium. To hold the filter cassette in the filter housing there is a clamping frame, which reaches over the edge of the filter cassette and forces the protruding, upstream side face of the outer strip into a seal of the filter housing and whose two opposing sides have a surface prong that reaches into the outermost fanfold of the filter medium and pushes it into another seal of the filter housing.

Abstract: A wire mesh filter screen has a flat disc shape and is seated on a flat bottom counterbore in a threaded fitting. A circular knife edged punch pierces a ring of material from the counterbore wall surrounding the disc periphery. A second flat punch axially deforms the ring over the disc periphery to securely retain the screen in the fitting.

Abstract: A filter media retaining assembly for use in an air filter includes a filter media engaging flange disposed on the side wall of the filter framework which holds a pleat of the filter media adjacent the side wall and a hinged keeper disposed along the edge of the side wall and movable between a closed position in which a portion of the keeper engages the filter media and the flange so as to retain the filter media in position along the flange and an open position in which the filter media may be lifted and removed from the flange.

Abstract: A one piece framework for holding the filter media of an air filter includes a pair of end walls integrally connected to a pair of frame members by a living hinge so that they may be pivotally moved between an assembled and unassembled position. A pair of side walls are integrally connected to the frame members by a living hinge only at their outermost ends so that they, too, may be pivotally moved between their assembled and unassembled position. The side walls and end walls are provided with a projection and a projection receiving latch that locks the end walls and side walls in their assembled state.

Abstract: A generally flat air filtering device for an optical disk drive is disclosed. As air is sucked into the disk drive via an inlet of a filter, a filter mat included in the filter removes dust and other impurities from the air. The purified air comes out of the outlet of a tube and then enters and cools an optical disk unit. The filter mat has a generally V-shaped section and, therefore, has a filtering area great enough to enhance efficient dust collection as well as the service life of the filter. To isolate the purified air from surrounding dust-containing air, an endless projection or rail is provided on the tube to bite into the filter mat which is flexible.

Abstract: A portable air filter system is described for use in the home, offices, or other areas where it is desired to remove airborne particulate matter from the air. The air filter system includes an enclosure having an air inlet and outlet areas, removable air filter which is grounded, a fan for moving air from the inlet to the outlet through the filter, and an ionizer for supplying negative ions to the air exiting through the outlet. The filter includes electrostatically charged fibrous material in a removable cartridge.

Abstract: A submicron particle filter unit of the Hepa type adapted to be interposed between a source of pressurized gas and a work-processing region to provide an environment therefor free of particles and other contaminants. The membrane of the unit is fabricated from a continuous, elongated, porous metal sheet accordion-folded to define a uniform series of pleats forming a media pack having an entry and an exit face, the pack being clamped with gaskets between the side plates of a frame or welded or otherwise joined thereto. Pressurized gas from the source applied to the entry face of the pack is filtered therethrough to yield at its exit face a laminar flow of gas which creates a clean environment for the work-producing region.

Abstract: An air filter unit comprising a first sheet of filter material folded into a zig-zag configuration with a generally planar second sheet of fine mesh air penetrable material extending across apexes of the zig-zag fold on one or both sides of the filter. The second sheet includes peripheral portions which are folded up against the lateral edges of the first sheet to facilitate mounting of the filter unit within a frame.

Abstract: A filter unit is made of two portions (14) of rigid corrugated material secured together along lands (50,52) extending parallel with the corrugations and, if desired, intermediate them, and also along lands (54) formed along one end of the corrugations, thus closing the passages formed when the two portions (14) are secured together. Suitable fastenings are adhesive bonding, and metallic fasteners, e.g. eyelets, or stitching. Further flanges (56) may be provided for facilitating a connection with a suitable suction or other air-drawing source; also if desired, such further lands (56) may be out-flanged for facilitating such connection. Apparatus for forming the sheet material is also provided whereby material from a continuous supply is progressively formed between two sets of blade members (102), the blade members being moved sequentially and alternately (as between the two sets) into forming engagement with the sheet material.

Abstract: A respirator cartridge having a housing, a replaceable filter and a cover is provided. The cartridge is sealed by a lip on the filter frame and sealing rings on the housing and cover. The cover is releasably connected to the housing by protuberances on the cover which slide along ramp-up lock devices on the housing when the cover is turned, compressing the filter frame and sealing the cartridge.

Abstract: A filter assembly of the Vee-panel type comprising a filter frame and a plurality of complementary pairs of replaceable filter panels slidably disposed within the frame and defining a plurality of adjacent Vee's with the apexes of the Vee's being disposed adjacent the air outlet end of the assembly. The filter frame defines a plurality of rectangular perimeter panel retention surfaces thereon adjacent the sides of the filter panels for retaining the panels in place and forming an air tight perimeter seal therewith. A compressible gasket is disposed about each of the panel retention surfaces.

Abstract: An air cleaner device includes a filter element for filtering air and being disposed in a housing. The device comprises a hollow housing having an inlet portion, an outlet portion, and a flow passage therein which is communicated with the inlet portion and the outlet portion. The housing also has an opening which is disposed between the inlet portion and the outlet portion, and communicates the flow passage with the exterior of the housing. A filter element is inserted through the opening into the flow passage, disposed between the inlet portion and the outlet portion, so as to filter the air flowing through the flow passage. A lid is mounted on the housing for covering the opening. A resilient urging member allows the lid to be urged toward the housing so as to close the opening, and the resilient urging member allows the lid to be moved away from the opening when this urging is released.

Abstract: A filter ring is described for insertion in ring-shaped apertures or openings of the wall of hollow bodies containing or through which gases or liquids flow. In its wall surrounding a hollow space, the ring has a longitudinal slit extending parallel to the axis of the ring along the entire axial length of the ring, the wall portions of the ring located to both sides of the slit being joined with one another by a snap lock. In accordance with the invention, this snap lock has at least two projections which are arranged in the one wall portion of the ring in an axial direction and which are snappable into grooves arranged equally adjacent to one anotehr on the other wall portion. The projections and grooves extend over the entire thickness of the ring wall and have side surfaces undercut in the joint direction and engage one another from behind.

Abstract: A submicron particle filter unit of the Hepa type adapted to be interposed between a source of pressurized gas and a work-processing region to provide an environment therefor free of particles and other contaminants. The membrane of the unit is fabricated from a continuous, elongated, porous metal sheet accordion-folded to define a uniform series of pleats forming a media pack having an entry and an exit face, the pack being clamped with gaskets between the side plates of a frame or welded or otherwise joined thereto. Pressurized gas from the source applied to the entry face of the pack is filtered therethrough to yield at its exit face a laminar flow of gas which creates a clean environment for the work-producing region.

Abstract: A gas sampling device includes a tubular ceramic filter element sealably mounted to a mounting plate and a locking member which secures the filter element to the mounting plate. The locking member includes a filter element cleaning nozzle which directs high velocity pulses of a cleaning gas into the filter element. An annular passageway surrounds the cleaning nozzle and carries gas from the filter element to an outlet port spaced a substantial distance from the open end of the nozzle.

Abstract: An air cleaner for an internal combustion engine includes a filter element and a housing having the filter element situated therein, with the housing having an outlet for allowing filtered air to flow to the engine and an inlet permitting entry of air into the housing. The outlet includes a venturi which is integral with the outer wall of the housing and which defines a passage through the wall, with the venturi expanding radially on the inner side of the housing's outer wall.

Abstract: A high reliability, non-blocking air filter for filtering large volumes of low pressure air from equipment to be maintained free of dust and impurities while being ventilated during operation is disclosed. The filter media is mounted in a frame having a U-shaped cross section construction, which is attached over an air intake opening of the piece of equipment. The filter media includes a planar base surface and a plurality of projections. The tops of the projections define a surface above said planar base surface for supporting free-flowing articles so as such that these articles do not obstruct the air flow through the air intake filter.

Abstract: A humidifier comprising a trough adapted to contain water, a wicking assembly having a lower end located in the trough and including a plurality of wick portions each including a generally planar strip of wicking material having an end, and a pleated strip of wicking material secured to the planar strip, and a frame for supporting the wick portions in generally parallel, side-by-side relation, the frame including a first frame member extending generally perpendicular to the planar strips and adjacent the ends of the planar strips and having therethrough a slot elongated in a direction generally perpendicular to the planar strips, and an adhesive extending into the slot and adhering to the ends of the planar strips for securing the ends of the planar strips to the frame member, and a fan for causing air flow through the wicking assembly.

Abstract: A smoke filter which is useful in containing smoke produced during electrosurgery or laser surgery procedures which has a prefilter layer to contain most of the smoke produced in these surgical procedures and to extend the useful life of the smoke filter, a microporous polymeric membrane layer which acts as a final filtering layer of the smoke filter and disposed between these two layers is a protective foam layer which protects the integrity of the microporous polymeric membrane from damage caused by the prefilter layer.

Abstract: A high efficiency air filter is described which comprises a depth filter sheet that has been formed with micropleats stabilized by application of a strip of a thermoplastic adhesive across the peaks of the micropleats and then formed into a macropleated structure with the axes of the micropleats and the macropleats being essentially parallel. The micropleats preferably have a bending radius of less than about 0.01 inch.

Abstract: The instant invention provides a strip shaped filter material having a longitudinal plane with crimps molded therein for filtering a liquid or a gas comprising filter material being folded in a zigzag shape and having individual fold segments; said individual fold segments being held at a distance from one another via the crimps; said filter material having nondeformed filter strip segments adjacent to each crimp; said crimp having a zenith height; and the filter material having a thickness, in a cross section placed perpendicular to the longitudinal plane of the strip, which constantly decreases within the area of the crimps, starting from the nondeformed filter strip segments, up to the zenith height of the crimp, and that at the same time, the filter material is increasingly compressed in the direction of decreasing thickness.

Abstract: Filter cartridge, in particular with a block-like construction, including a plurality of fold walls created by folding in a zig-zag fashion for a medium to be filtered to pass through from one edge area of the zig-zag folding in the direction of the edge area of the folding on the opposite side made of a material which can be permeated by the medium to be filtered provided with offsets formed by roll forming which extend out on both sides of each fold wall in the direction of flow of the medium and, in particular, are of a length which is greater than their width whereby the offsets of adjacent fold walls lie in contact with one another as spacers and stiffeners and that the height of the offsets lying in contact with one another of two fold walls connected together by a fold edge increases in the direction of the opposite fold edge and that therefore the spacing between two adjacent fold walls decreases uniformly in the direction of flow until the medium passes through the fold wall from which point on the s

Abstract: A filter assembly comprising: first and second compartments, the first compartment comprising an exit tube, the second compartment comprising an air inlet the exit tube comprises a plurality of radial inwardly extending stand-offs; an air flow sensor for sensing the mass of air exiting the exit tube, including an exit conduit adapted to be received upon and supported by the stand-offs; the exit conduit and exit tube cooperating to form a tuner inlet passage, the air flow sensor further including an entrance conduit, positioned upstream of the exit conduit; an insert comprising tapered walls including first and second ends, the first end defining an opening conformal to a first open end of the first housing member and adapted to be joined therewith, the second end defining a hollow sleeve of substantially the same size as the entrance conduit and adapted to sealingly mate therewith; thereby enclosing, in cooperation with the first compartment a tuner volume communicated with the tuner inlet passage; an air fil

Abstract: A filter for filtering gases, such as air, using a backing material on the downstream side of a filter media to prevent the filter media from blowing out, or separating from a frame. The backing material is congruent in shape with the filter media, so that if the filter media is pleated, the backing material is pleated in a like shape. The backing material may extend to an upstream side of said filter media so as to further aid in blow out resistance.

Abstract: A disposable air filter includes a pair of cover members which enclose an outlet body defining an outlet chamber communicating with an outlet tube. A pair of panel filter elements are supported on opposite sides of the outlet body. Fasteners interconnect the cover members so that they compress seals carried by the filter elements against the outlet body.

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: A high efficiency filter and method for its production. An array of tube-type sleeves, each sleeve composed of a filtering medium and joined longitudinally along its exterior surface to the adjacent sleeve, is expandably fixed into a framework and all margins of the array are sealed to the framework in order that a fluid passing orthogonally through the plane of the array and its frame must pass through at least two filtering surfaces. The process and machine used to make the aforementioned product start with a relatively narrow roll of filtration media and, through a series of steps, form, cut and glue the media so as to form the requisite sleeve structure and then by means of controlled curing, affix a predetermined number of the sleeves in to the desired array.

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 crankcase filter assembly for filtering air in a crankcase ventilation system. The crankcase filter assembly (71) includes a crankcase filter housing disposed in an air cleaner assembly. The crankcase filter housing defines an opening in fluid communication with the air cleaner assembly and includes a first air inlet or drain hole spaced from opening and an air outlet in fluid communication with an engine crankcase. A filter cartridge supports first and second filters within the crankcase filter housing in respective first and second filter positions establishing a filter spacing therebetween. The filter cartridge interconnects the first and second filters for allowing their insertion and removable from the crankcase filter housing as a single unitary cartridge structure while maintaining the filter spacing between the first and second filters.

Abstract: A high efficiency filter assembly having a generally rectangular pleated filter element with ends defined by the pleated edges of the element and sides defined by generally planar side edges of the element. The filter element is mounted in a generally rectangular housing formed by two pairs of oppositely disposed frame members that are joined together. Each frame member has a planar base member and a pair of upright side member defining an open ended channel to receive the ends and sides of the filter element. At least one spacing member extends along the base portion to space the ends and sides of the filter element from the surface of the planar member. A dam member is provided at each end of one of the pairs of planar members to enclose the channel, and a sealant is disposed in the channel and the ends of the filter element are embedded in the sealant.

Abstract: A backflushed panel type filtration system is positionable over the flow discharge opening in a dividing wall separating the material collection and clean air flow chamber portion of an air throughflow type particulate collecting device. The filtration system has a filter media section captively retained within an inner peripheral face frame which, in turn, is nested within an outer support frame, this dual frame structure being provided with upstream and downstream peripheral face sealing gaskets. An upstream side flange portion of the outer frame is insertable into the discharge opening and serves to automatically align the filter structure therewith. An internally partitioned clean air flow shroud is removably positionable atop the filter structure and has flange portions which engage the downstream seal gasket and cooperate with side wall portions of the outer filter frame to automatically align the shroud with the underlying filter structure.

Abstract: An air cleaner has a filter, an annular filter holder formed on the peripheral edge of the filter, a flange portion of U-like cross-section to which the outer circumference of the filter holder is embedded, and a case provided with an air inlet port and an air outlet port. This case is molded in blow molding using a filter member constituted integrally by the filter and the filter holder as an insert. In this air cleaner, the constitution parts, become as little as possible.

Abstract: A filter device having a plurality of filter elements and at least one flexible joint connecting the filter elements to each other. The filter elements are made of a substantially inflexible material and have connecting surfaces in parallel with a direction of air flowing through a passage in which the filter device is provided. One end of the flexible joint is connected to the connecting surface of one of the filter elements, and the other end of the flexible joint is connected to the connecting surface of the filter element adjacent thereto.

Abstract: A filter element comprises at least two pleated filtering mediums and at least one roughly flat filtering medium interposed between the pleated filtering mediums. Each pleated filtering medium has an end constituted by edges of triangular bottom sections and the other end constituted by edges of triangular top sections. The triangular bottom sections of one pleated filtering medium is bonded to the flat filtering medium only at and near the edges of the bottom sections. The triangular top sections of the other pleated filtering medium is bonded to the roughly flat filtering medium only at and near the edges of the top sections. Spacers are provided between the top sections and the flat filtering medium and between the bottom sections and the roughly flat filtering medium. Such spacers may be constituted by alternate small ridges and grooves formed in the roughly flat filtering medium.

Abstract: The filter comprises a body (10) defining a chamber (101) to which access is had through an opening (102) closed by a cover (103). The chamber is adapted to receive a filtering cartridge (20). The body (10) is made in two semi-shells (110, 120) which are united in a junction plane (100) extending across the chamber (101), the opening (102) for the passage of the filtering cartridge (20) being astride the junction plane (100). A positioning device (30) for the filtering cartridge is carried by the body (10) to permit the insertion or the removal of the cartridge (20) by a movement in translation in a direction substantially parallel to the junction plane (100) and the positioning and the retraction of the cartridge by a displacement in a direction substantially perpendicular to the junction plane (100). Application in automotive vehicle engines.

Abstract: An air filter unit of the HEPA type having a filter core of zig-zag folded media enclosed by a four-sided frame having two side casings and two end casings. Each end casing includes a recess extending into the inwardly facing surface thereof and bounded on all four sides by marginal edge portions of the end casing. The end flaps of the folded media are adhesively secured to the inwardly facing surfaces of the side casings and the recesses in the end casings are filled with an adhesive initially in a flowable state and hardenable to a solid state. The zig-zag edges of the folded media are disposed entirely within the adhesive, as are tenons extending from the ends of the side casings, thereby forming a mortise type joint between the side and end casings. A plurality of channels, preferably of dove tail cross section, extend across and communicate with the recesses in the end casings.

Abstract: A filter cartridge for treating a fluid passing therethrough includes a filtering medium and a support container for holding the filtering medium. The support container includes a solid side wall having first and second ends and a pair of perforated end walls, one located on each end of the side wall. A pair of connectors is provided for securing a respective one of the end walls to a respective end of the side wall. A sleeve secures the connectors to the side wall in a substantially leak-proof manner.

Abstract: An interlocking wedge for pleated paper filter elements of the type having a plurality of pleated paper filter panels secured in a frame in a zig-zag configuration with plural apexes adjacent both the upstream and downstream ends of the frame forming plural wedge shaped air inlet and outlet spaces and a plurality of elongated V-shaped spacing wedges disposed in the downstream wedge shaped air outlet spaces adjacent the panels wherein the downstream end of each of the wedges extends transversely through one of the outlet openings in the downstream end of the frame and define recessed areas so as to provide an interference fit between said portions of the wedges in the downstream end of the frame to interlock the wedges with the frame and thereby prevent lateral separation of the wedges with respect to the frame upon the element being subject to uneven loading.

Abstract: A tubular filter element for liquid filters comprises a perforated support pipe. Disposed around the inside of the support pipe is a tubular filter layer which comprises a folded sheet of filter material. Within each end of the filter element a spring washer is disposed for biasing the end of the tubular filter layer outwardly against the inside of the support pipe. In this pre-biased state, the ends of the filter element are joined to disks by means of a hardenable casting material.

Abstract: A cartridge air filter for use with an internal combustion engine and method of making the air filter. The air filter comprises a fuel spitback shield having means for collecting spitback fuel from a carburetor and means for substantially containing collected fuel spitback with the collecting means for re-injection into the engine.

Abstract: A dust collector of a large capacity suitable for cleaning air or gases and for separating out by-products of an industrial process for further utilization. The collector generally comprises a continuous and integral filter medium which is suspended form a plurality of downwardly extending frames forming a series of separate elements having a triangular cross-section, each element being relatively wide at the top and narrow at the bottom to define, between adjacent elements, a divergent collecting space which is wide at the bottom.

Abstract: A compact combination engine air cleaner/noise deadener for installation in the engine compartment of a motor vehicle type engine includes a two piece plastic elongated housing that is compact and has an ambient air inlet at one end radially spaced from an air outlet to the engine located on the axis of the housing, the inlet containing a first noise attenuating venturi, the housing having an air filter at the other end connected to the venturi and discharging air into a second convergent-divergent flow control noise attenuating venturi with which is integrated a mass air flow sensor, the venturis being surrounded by a dead air space type resonating chamber that has an inlet concentric with the air outlet so that engine feedback noises and sound waves are trapped in the chamber and dissipated, and any sound waves passing serially into the venturis bounce off the walls of the venturi diffusers to also be dissipated, thus minimizing the transmission of engine feedback noises past the air cleaner.

Abstract: This is concerned with an air filter cleaning arrangement in which the filter element, meaning the pleated filter media and its frame, is functionally connected to a vibrator so that it is resiliently or vibrationally isolated from the surrounding structure. The major effective component of the vibratory motion applied to the filter media is across the width of the filter pleats. The invention is used primarily in an industrial sweeper. It can also be used in other machines or equipment which have air filter.

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.