ZIGZAG, CORRUGATED, OR CONICAL

A filter cartridge for suspended particles comprising a frame and a filter web supported by the frame, the filter web being embedded in the frame which is formed of plastic material. The outside of the filter web is provided with a support grid or wire network which is likewise embedded in the frame....     

A filter structure comprising a support and a porous folded sheet having a plurality of cooperating groups of corrugations, wherein the folds of one group overlap at least in part the folds of the adjacent group and have a uniform thickness, length and substantially parallel fold apex lines. On opposed...     

A filter pleat fold spacer for use in a gas filter device of the type having a flow-through filter frame and a pleated filter media disposed within the frame to hold the pleats of the filter media apart when subjected to the flow of gas to be filtered, the pleat spacer being formed to provide a yieldable...     

An apparatus for filtering, washing and cooling gases including a chamber having inlet ducting and outlet ducting. Gases conducted through the inlet ducting into the chamber are cleaned and cooled therein and removed through the outlet ducting. Within the chamber is a convoluted foraminous wall extending...     

A sintered filter trap is adapted for insertion in a gas stream of sodium vapor to condense and deposit sodium thereon. The filter is heated and operated above the melting temperature of sodium, resulting in a more efficient means to remove sodium particulates from the effluent inert gas emanating from...     

A self contained filter assembly for cleaning air and gas which is light-weight, inexpensive and easily disposable. The filter assembly includes a housing having walls formed of corrugated cardboard. A paper filter element in the form of a paper web is positioned in the housing and is folded in an accordian-like...     

An electrostatic air cleaning apparatus having a source of relatively large magnitude electrical voltage. The cell comprises a charged ionizing section and a collecting section comprising a charged grid and a grounded grid sandwiching therebetween a sheet of foraminous filter media. One of the grids...     

A filter apparatus for removing contaminant particles from an air or gas stream, the apparatus including a filter medium, disposed therein in pleated form, across the air or gas stream to be treated. A rectangular frame has inner side walls defining therebetween a path for the air or gas stream to be...     

An industrial sweeper has a filter unit in the debris hopper with the filter unit comprising rows of cartridges having pleated paper filter elements that are cyclically cleaned by reverse jet pulses of air without interrupting the filtering action by the main blower.

Improved aerosol filters, particularly cigarette filters, are prepared by imparting a patterned surface, preferably a plurality of longitudinal grooves, to a web of a synthetic thermoplastic fibrous material, preferably a tow of longitudinally aligned crimped continuous cellulose acetate filaments, and...     

A rigid foam hemisphere attaches to the air inlet of cylindrical convex air rigid foam straightener and to internal combustion engine to define air filter therefor.

An air filter is formed into an accordion-shaped body having reverse folds forming pockets. A plurality of string-like pleat spacing members are provided and with each member being threaded through a plurality of openings in the pocket walls. The openings are smaller in diameter than that of the spacing...     

An accelerator for charged particles comprising: a vacuum tight chamber, means for producing a beam of particles, and means for inhibiting secondary emission. The means for inhibiting secondary emission comprises outwardly extending wedge-shaped members covering the inner walls of the vacuum chamber....     

A gas filter element comprising a holding frame and a plurality of self-supporting wedge-shaped filter pockets each having its wide end open and secured to said frame, each element comprising a pair of substantially symmetrical pocket halves secured to one another along the wedge edge and centrally along...     

A fluid filter and a method for making it. The filter comprises a one-piece container having one open surface, a pleated filter element fitting in the container, and a cover fitting over the container's open surface. A trough in the container receives and positions three side edges of the filter element,...     

A strainer blank comprises a flat sheet having a plurality of cutouts including a cutout adapted to define a strainer portion at the apex of a cone formed from the blank. Strainer material positioned over the cutouts defines a convex rear end at the apex which is folded during formation of the conical...     

This invention relates to improvements in an air-cleaner for internal combustion engines, more particularly, to an improved air-cleaner having such sound-silencing construction that an air-cleaner element is removably fixed in a vibration-isolating cover which is provided in the housing of the air-cleaner.

A filtering device comprises a cylindrical member bored with a large number of holes; a sheet-like filter element crosswise folded like bellows and rolled into a cylindrical form so as to concentrically surround the bored cylindrical member and a plurality of thin band-shaped liquid passage plates interposed...     

Disposable filter for fluids in the form of a ring of pleated filter material provided with continuous lines of corrugations at right angles to the pleats; some of the lines have corrugations of greater height than the other lines.

An air filter for filtering particulate matter from air flowing therethrough to a point of use requiring clean air, includes an imperforate front wall, a perforate back wall and opposite, imperforate side walls. The front wall is smaller in height than the back wall and a pair of pleated filter elements...     

Filter elements are described in which a pleated cylindrical sheet of non-woven microporous glass fibre filter material impregnated with a binder, which may be silicone, polyurethane, phenolic resin or epoxy resin, is mounted in contact with a cylindrical supporting sheet of, for example, expanded metal...     

The drawings illustrate an air filter assembly which is assembled from a pair of identical box-like housing halves. Equally spaced rib elements are formed in each half such that, upon assembly, the rib elements are interdigitated to provide a space for confining therebetween a pleated filtering sheet...     

A plurality of laterally spaced parallel tapes extend along each side of a strip of filter material in engagement with it, and the sheets and tapes are in accordion folded form so that there is a stack of integrally connected parallel filter sheets spaced apart by the portions of the tapes between them....     

A sheet of porous filter material folded into accordion pleats, the pleats having opposite edges folded over on diagonal fold lines to close the opposite edges of alternate pleats. The pleated and folded sheet is selectively disposed in flat panel form or formed into a tube with the pleats extending...     

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...     

Disclosed herein is an air filter assembly particularly adapted for use in building air conditioning systems. The assembly is comprised of an open ended housing defining an air inlet and an air outlet and having a continuous layer of pleated filtering media extending thereacross and a plurality of pleat...     

A filter including a resilient frame, a hollow body of pleated paper, and end closures, molded together to make a flexible unitary structure which maintains its shape and has the efficiency characteristics of the paper medium.

Gas filtration apparatus comprises a filter element mounted in a casing having an inlet and an outlet so disposed that gas flowing from inlet to outlet is constrained to pass through the filter element, an audible warning device operable by gas flowing through the inlet and means responsive to the difference...     

A novel arrangement for mounting the filter elements of an air filter in a manner which facilitates their removal and replacement without tools or accessories.

The size of an air filter is greatly reduced compared to the size of conventional bag house type filters by the use of pleated paper filter elements grossly derated to withstand the sudden pulsating forces inherent in reverse jet cleaning.

An exchangeable filter element is disclosed. The filter element is especially adapted for nuclear installations for the purification of gas streams which contain toxic or radioactive matter. A method is also disclosed for the exchange and disposal of contaminated filter elements, which filter elements...     

A downhole liquid-gas separator for use with a submergible pump employs an inverted conical, convoluted, fine-mesh screen in a tubular housing. The convolutions form grooves extending upwardly along the screen. A liquid-gas mixture enters the housing near the lower, apex end of the screen. The screen...     

An aircraft is constructed of an airfoil shaped inflated involucrum of lightweight gas-impervious plastic film. The airfoil is maneuverable to attain forward self-propulsion upon ascent as well as descent. The gases contained in the involucrum are heated by solar radiation to reduce craft density with...     

A filter bed for an air cleaner, or the like, comprising a compressed mass of coils each having axially spaced portions of different diameters. With this construction, the tendency of the coils to nest together over their entire lengths is reduced, and the filtering ability of the bed is increased.

An air prefilter is disclosed for use with internal combustion engine air filters of the type having replaceable filter elements. The prefilter has a perforated sleeve connected between the usual intake openings and the filter element of the conventional air filter. This perforated sleeve is enveloped...     

A pleated paper filter element has the configuration of the frustrum of a cone with the pleats extending lengthwise of the sloping wall of the cone and has pleat separation dimples embossed into the paper from which the element is made, the height of said dimples being graduated lengthwise of the element...     

A filtering device for removing particulate matter from a gas stream includes a housing with its interior divided by a horizontal partition into an upper plenum chamber and a lower plenum chamber. Planar panel filters arranged in V-shaped banks are suspended from the horizontal partition in the lower...     

A gas filter comprising a square frame and an interchangeable filter package containing a filter web of a folded zig-zag configuration forming a plurality of proximate filter pockets received on a support grid mounted on the frame and having a shape complementary to the folds of the filter web.

A diesel engine exhaust particulate filter-incinerator comprising an enclosed filter panel having particulate deposition surfaces bordered by electrodes of a high voltage power supply. Periodic incineration is accomplished by the collection on the surfaces of particulates in amounts sufficient to conduct...     

This invention comprehends a new and unique means for preventing the crowns of a backflushable filter element unit from splitting which has heretofore been caused by the cyclic action of the cleaning and backflushing. A layer of staple material is positioned adjacent the outer layer of filter media to...     

A pocket filter cartridge including at least one sheath-like filter bag which is suspended from a mounting sleeve affixed to an apertured header plate disposed across a dirty gas stream by a retaining collar holding it in press-fit clamping relation to the mounting member.

An air filter assembly including an electret filter sheet of material which exhibits electrical charges of opposite sign on opposite faces thereof and a non-electret conventional filter sheet of material combined with and disposed upstream from the electret filter sheet of material, whereby particles...     

A pocket filter cartridge having a plurality of side-by-side filter bags secured to a filter header assembly adapted to be secured across a dirty gas stream in a gas duct. The header assembly includes a generally rectangular frame in which the filter bags are secured by collars mounted in the mouths...     

An air cleaning method and apparatus in which air to be cleaned is drawn toward and through a filter (44, 45) along a normal path having a first component extending from a first to a second end of the filter, so as to initially collect particulate matter on the filter,in which momentary pulses of clean...     

Disclosed herein is a disposable lightweight filter assembly which has a high flow through capacity and which is adapted to be positioned in a relatively small inaccessible space. The assembly includes a cylindrical housing having an air outlet at one end, a plurality of air inlet apertures in the side...     

A replaceable filter cartridge has a pleated paper filter medium mounted within a frame or casing having a closed side and an open side, the open side being covered by a removable protective tray or lid the internal shape of which has been used in manufacture for moulding a sealing surface onto the periphery...     

A gas borne particle filtering apparatus having a filter medium (13) with inlet and outlet openings (11, 12) in a staggered sawtooth cross-sectional configuration (140, 141) in a casing (10) for the filter medium positioned such that the gas passes along and between the sawteeth on both sides of the...     

A filter device used to filter medical anesthesia gases and other inhalable respiratory gases. The filter device has a ported housing, and a filter member within the housing. The filter member is a porous sheet that is transversely pleated and draped to define a peripheral foot of such porous sheet....     

Commercial pleated paper filter elements are applied at full rated gas flow capacity in applications requiring removal of large quantities of particulate matter from large volumes of flowing air or other gas by combining the elements as second stage filters with a primary stage cyclonic separator and...     

An air cleaner comprises at least two pleated paper filter elements each having the configuration of a frustrum of a cone and mounted in side-by-side relation in a casing with their relatively wide diameter ends in sealing relation to a common, impermeable baseplate means dividing said casing into two...     

The invention provides an air cleaner assembly in combination with an engine having a blower housing with airflow circulating therethrough and a carburetor having an intake. The assembly comprises a duct having an inlet and an outlet with the inlet angularly disposed through the blower housing, an air...     

A circular array of accordian pleated filter material is core and edge sealed, placed in a supporting shell, peripherally sealed thereinplace and capped. Core sealing of the array of filter material is accomplished with a fill of hot melt adhesive and edge sealing with application of a covering strip...     

The invention provides an air cleaner assembly in combination with an engine having a blower housing with airflow circulating therethrough and a carburetor having an intake. The assembly comprises a duct having an inlet and an outlet with the inlet angularly disposed through the blower housing, an air...     

Air filter elements employing a block of deep pleated paper and methods of their construction. A preferred filter element comprises top and bottom end members both adapted for through passage of air and a first pair of side walls, a block of deep-pleated paper between the end members and the side walls,...     

A filter means for filtering fluid comprises a first filter section and a second filter section. The filter means is formed by using a folded sheet material having a trapezoid or a sector form. The second filter section of the filter means has a filtering performance different from that of the first...     

A dust collecting filter is provided with a zigzag shaped filter member having small meshes and comparatively large flowing resistance, which is disposed within a casing so that the zigzag shaped cross section thereof extends in the fluid flowing direction. Other filter members having comparatively small...     

An improved selfcleaning air filter (2) of the pulse jet type. The filter includes at least one filter element (20) located in a dirty air plenum (6) which is separated from a clean air plenum (8) by a partition (10). A nozzle (70) directs a cleaning jet of gas that moves in a back flow direction along...     

A heat exchanger comprises an elongated plate folded in corrugated fashion and defining a stack of a number of laminated air passages defined by spacer parallel plane heat transfer faces or plates connected alternately along opposite side edges by narrow partition plates. In alternate air passages, spacer...     

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,...     

This invention comprehends a new and unique means for preventing the crowns (forward projections of the pleats) of a backflushable filter element from splitting due to the cyclic action that is experienced during cleaning and backflushing. In one embodiment, a plurality of spacers, preferably wedge shape,...     

A generally tubular pleated paper filter element is constructed in the form of a frustrum of a cone having an aspect ratio (the ratio of element length to base diameter) in the range 1.5 to 2.5 and an included angle in the range 2 to 5 degrees.

A fluid cleaner system including a filter element of substantially cylindrical construction corrugated in a cross-section including the axis thereof to allow a fluid to flow axially from one end to the other end. The filter element is supported and sealed by support means and sealing means and mounted...     

A high-efficiency electrostatic air filter device having high dust collecting efficiency and a long service life is provided. The device is composed of a charging section for electrically charging the dust particles in a gas to be treated, and a dust collecting section provided with a filter medium meandering...     

A high efficiency particulate air filter assembly (10) having low air flow resistance. The filter assembly (10) includes a radially pleated filter element (20) having a number of pleats generally equal to 14 times the numerical value of the diameter in inches plus 5 times the numerical value of the diameter...     

A filtration module formed from a first flexible sheet having a first edge section, an opposed second edge section and an interior section, comprising engaging each portion of the first and second edge sections respectively to uncorrugated first upper and lower terminal elements. Corrugations are formed...     

At preferably circular filter cartridges, where pleated filter material is placed around a centrally arranged perforated tube, this filter material can be sucked to collapse if the pressure gradient through the material becomes large, whereby the advantages having a pleated filter cartridge with a relatively...     

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....     

A nebulization reflux concentrator 10 for removing trace gas contaminants from a sample gas is disclosed. Sample gas from a gas supply 40 is drawn by a suction source 42 into a vessel 11. The gas enters vessel 11 through an atomizing nozzle 16, thereby atomizing and entraining a scrubbing liquid solvent...     

In an air cleaner employing a pleated paper filter element in the form of a frustrum of a cone mounted in a tubular air cleaner casing having a first opening axially thereof communicating with the inside of said element at the relatively wide end of said frustrum and a second opening in the cylindrical...     

A HEPA filter is disclosed which includes an outer frame which encloses a filter assembly that includes a plurality of horizontally corrugated panels with alternate flat integral separator panels folded therebetween all formed from a continuous sheet or strip of filter media, and with vertical crease...     

A crimp seal pleated filter assembly having a base (20), a frame (40) and a filter media (60), including a plurality of pleats (66). When assembled, the pleats (66) of the filter media (60) are uniformly aligned within the assembly 10 and are secured therein by crimp sealing the filter media ends (62)...     

A filter used for air cleaners. In this filter, a filter medium, which is obtained by folding a piece of elongated filter paper so that ridges and valleys are formed alternately, fitting spacers on this folded filter paper so as to maintain the spaces among the ridges and valleys properly, and then bending...     

Filter cartridge for filtering apparatuses for removing impurities from hot and/or highly pressurized flowing gases, with zig-zag formed, folded, gas-penetrated filter material whose part surfaces caused by the folding, between the fold lines, are arranged in relatively close juxtaposition to each other,...     

A filter element and method for making it include the steps of providing a pleated paper filtering media and providing a batt-like filtering media containing thermoplastic fibers which is slightly larger than the pleated paper filtering media. A ring-shaped die is used in a press to apply heat and pressure...     

A porous media air filter unit for a power sweeper includes an impingement or barrier type filter element mounted on a combination support plate and clean air discharge plenum which redirects the filtered air flow at right angles relative to the central axis of the filter element. Multiple reverse jet...     

A high efficiency particulate air filter is disclosed which has a channel formed in the front peripheral surface thereof, with the channel being substantially filled with a sealant which comprises an essentially non-volatile and non-hardening gum-like material. The physical properties of the sealant...     

A filter element has a generally ring-like structure which basically comprises a plurality of generally radial sections circumferentially arranged to define a central space. Each radial section has a plurality of circumferentially zigzag pleats formed from a ribbon of a filtering sheet material. The...     

A renewable, multi-layered filter apparatus (20) is disclosed. The filter apparatus (20) includes a housing (22) having a fluid inlet (24) for ingress of a contaminated fluid flow and a fluid outlet (26) for egress of a filtered fluid flow. A filter element (28) is supported intermediate of the fluid...     

A filter apparatus includes a filter element. The filter element is formed of a sheet of gas-porous filter material which has been folded into accordian pleats. Alternate pleat-folds are of tight, near knife-edge definition, and arcuate form definition. Hence, all folds on one side of the accordian-folded...     

An exhaust gas filter for diesel particulates, comprising a row of a plurality of channels of honeycomb structure of porous sintered ceramic fiber composite sheet, the ceramic fiber composite sheet being produced by a paper-forming method from a slurry of alumino-silicate fiber and fire clay. The honeycomb...     

A filter comprises a filtering wall (2) which has a front face and a rear face and which is normally permeated by a medium in a direction from the front face towards the rear face such that the pollutants entrained by the medium are separated at the front face of the filtering wall and the purified medium...     

A filter element suitable for use in a filter device such as air cleaner, oil filter or fuel filter for an automobile is disclosed. It includes a pair of end plates and a filter paper which is disposed between the end plates and folded so as to form rectangular-shaped sections, thus folded filter paper...     

Disclosed are pleated paper barrier type air filter elements having planar filter panels that are cleaned by a reverse air jet cleaning system which includes one or more specifically shaped cleaning air manifolds or heads in which a plurality of jet nozzles or orifices are arranged in a predetermined...     

The present invention provides a filter element made wholly of fluorocarbon resin, including as essential elements a filter material produced by folding a sandwich-form sheet comprising a filter membrane made of a fluorocarbon resin and net supporters made of a thermoplastic fluorocarbon resin superimposed...     

A filter element adapted to be incorporated in filter devices such as air filter, oil filter and fuel filter is disclosed which includes a pair of end plates and a filter material folded so as to form a series of pleats and disposed between the end plates to define a hollow cylinder having outer and...     

A high efficiency particulate air filter, and a method of fabricating the same, are disclosed, with the filter being characterized by being lightweight and readily disposable after use. Further, the filter may be fabricated in a basic or universal form, which permits it to be utilized to form any one...     

A particulate filter medium is formed of a sintered composite of 0.5 micron diameter quartz fibers and 2 micron diameter stainless steel fibers. A preferred composition is about 40 vol. % quartz and about 60 vol. % stainless steel fibers. The media is sintered at about 1100.degree. C. to bond the stainless...     

An air cleaner assembly includes a pair of molded housing members, each of which include four side walls and an open end. The opposite end of one of the members carries an outlet tube for connection to the air intake system of the vehicle, and the opposite end of the other member includes a lattice-work...     

A hydrogen permeation membrane in the form of a metal coating such as palium and alloys of palladium less than 100 microns in thickness supported by a fabric with a mesh width not exceeding 50 microns. A diffusion blocking material such as nickel and alloys of nickel may be provided. The metal coating...     

A filter screen for filtering contaminant particles from the fluid system of a hydraulic system comprises a screen which forms an axially extended convoluted nipple-like enclosure which opens through a passage formed in a base and terminates at a nose portion opposite the base. The screen has folded...     

An air filter assembly (1) includes an outer casing (6) having end, rear and downstream portions which are generally planular and thus easily settable on the floor during installation, with the downstream portion being mountable flush to a furnace (3) or the like. An inner filter-holding drawer (7) is...     

A fluid filter element comprises a first filtering medium and a second filtering medium. The first filtering medium includes a nonwoven batt having a marginal edge portion circumscribing the main body portion of the batt in which the fibers are stiffened to provide a support and sealing structure. The...     

A vapor delivery pressure test adapter for integral installation at the outlet of a vapor delivery pressure regulator within a self-contained vapor delivery system, comprising a vapor pipe nipple compatible with such system, with vapor filter means internally and fixedly mounted within the nipple, and...     

An air sterilization filter for the containment of leakage prevention of biologically contaminated air in space for a biotechnological performance, such as a genetic engineering work. The filter comprises a heat durable sheet filter for collecting microorganisms suspended in air and a heater for heating...     

A filter canister for use with gas masks has telescoping top and bottom parts that are, in the assembled canister, sealed together. A filter for particulate material is molded in situ in the top part, while a separate adsorbent material cartridge is fitted into the bottom part. In manufacturing the canister,...     

A plate-like air cleaner element housed in an air cleaner case divides the interior of the air cleaner case into an uncleaned-air chamber and a cleaned-air chamber. The air cleaner element can filter uncleaned air introduced in the uncleaned-air chamber to deliver cleaned air into the cleaner-air chamber....     

A filtration system for extracting solids from a gas includes a separator having an inlet section and an expansion chamber. A filter is located in an upper portion of the expansion chamber. Two hingedly interconnected plate sections extend from the inlet section to the expansion chamber to control the...     

The filter element of the present has a plurality of wavy portions which are so arranged that a plurality of wavy portions make a generally ring like structure. In order to reduce the pressure drop when the fluid flows through the filter element, the present filter element has a special shaped radial...     

A filter device includes an annular filter element having a plurality of wave portions extending outwardly, a central cup-shaped portion arranged at an inner periphery of the filter element, a support frame arranged at an outer periphery of the filter element, and a connecting portion at which both sides...     

A filter comprises a pleated fabric filter bag of generally rectangular configuration within which is removably disposed an internal reinforcing cage of wire or rigid plastics material. The pleated fabric filter bag has an open end and a closed end and at its open end there is moulded integrally with...