Abstract: The filter of honeycomb construction has a matrix of thin, interconnected walls which define a multiplicity of cells and which have interconnected open porosity of a volume and size sufficient to enable the fluid to flow completely across the thin walls in their narrow dimensions between adjoining cells and through the thin walls in their longer dimensions between adjoining or neighboring cells and to restrict the particulates in the fluid from flowing either completely across or through any of the thin walls, and has the cells divided into an inlet group and an outlet group and providing the inlet group of cells with substantially greater desirably about 25% or more greater, collective thin wall surface area than is provided to the outlet group of cells. Portions of the inlet group cells adjoin one another and share in common the same thin wall.

Abstract: In a solid particulate filter of honeycomb structure comprising a matrix of thin, interconnecting porous walls defining groups of inlet and outlet cells, the characteristics of fluid flow through a first subset of the thin walls, being shared in common between adjoining inlet and outlet cells, are differentially controlled relative to that of a second subset of thin walls, being shared in common between adjoining inlet cells, by forming each subset with uniform thicknesses which differ between the subsets. In a brittle solid particulate filter of honycomb structure having opposing inlet and outlet end faces and cells extending therebetween, improved thermal shock capability is provided by selecting outlet cell geometries and orientations with respect to the inlet cells so as to form flexing or movable joints between some or all of the thin walls shared by adjoining inlet and outlet cells and the thin walls shared between adjoining inlet cells.

Abstract: A filter device having a first housing and a second housing clasping therebetween a filter membrane. The housings are domed or convexly-shaped and have cylindrical hubs. A peripheral flange extends radially away from each of said dome-shaped housings and one of the pheripheral flanges has integrally formed thereon a plurality of ribs of predetermined length laying on a circumference of said one peripheral flange at arcuate locations therearound. The filter membrane is of circular configuration having radial projections extending around the circumference thereof. The ribs fit between the projections so that ultrasonic welding melts the ribs and fuses the two housings together, holding the filter membrane therebetween.

Abstract: An accreted batt is progressively vacuum formed about a porous or perforated member passing through an accretion zone under conditions where felting of the fiber occurs under a constant vacuum condition and a consolidation and dewatering zone wherein the batt is subjected to a separate but different vacuum condition. The two vacuum zones are spaced from each other by an air-water separation zone through which the mandrel passes and, in which, the liquid phase and air phase is substantially parted from each other. Each vacuum zone is energized by its own vacuum source, with the source for the accretion zone carrying away the water phase and the source for consolidation and dewatering zone carrying away the air phase from the separation zone.

Abstract: A process of manufacturing an electrostatically charged filtration medium is disclosed. A web made of nonconductive thermoplastic fibers is contacted on each side with a more conductive web to form a combined web. The combined web is charged with electrically charged particles from corona charging elements on opposite sides of the web. The charging elements are operated at a voltage of from 5 to 25 kV but with opposite polarity.

Abstract: Diesel exhaust particulates are efficiently trapped by incineration cleanable ceramic monolith porous wall filter elements. A number of arrangements for high efficiency elements having high filtration area in compact units are disclosed as are exemplary methods of construction.

Abstract: A combined filter and filter-drier, for the suction side of refrigeration and air conditioning systems, comprises a dual filter system straddling a cylindrical plug of dessicant. Upstream of the dessicant, a rigidly built primary filter assembly comprises an inlet deflector and a stepped filter. Downstream of the dessicant, a secondary filter assembly comprises an outlet filter pad which is compressed by a coaxially disposed spring near the inlet of the filter/filter-drier. The inlet deflector is preferably triangular in shape and is disposed transversely to the inlet.

Abstract: A filter for purifying exhaust gas of an automobile or the like comprises a rigid ceramic supporting member provided with at least one flow passage and porous ceramic filtering material which is charged within the passage and sintered to the walls so as to be integrally connected to the supporting member. This filter shows excellent exhaust gas purifying efficiency as well as high mechanical strength.

Abstract: 65-99 percent by weight poly(tetrafluoroethylene) fibers and 1-35 percent by weight glass fibers are combined in an intimate blend suitable for the preparation of filter felts having reduced leakage while maintaining high permeability to gas flow.

Abstract: Electrically charged particulates in a gas stream are filtered from the gas stream by a filter medium comprising a porous cake composed of electrically charged particulates previously drawn from the gas stream and collected on a foraminous support structure, where the apertures of the foraminous support structure are larger than the average size of the particulates to be filtered from the gas stream by more than an order of magnitude.

Abstract: A filter assembly (10) for the filtration of toxic gases from the air is disclosed, which includes a unitized cylindrical housing having oppositely disposed end covers (11, 12), with an inlet port (11a) in one end cover and an outlet port (13a) in the side wall. An annular, pleated filter element (21) extends between the end covers (11, 12) between perforated liners (18, 19), and a third, perforated liner (20) is spaced outwardly from the center or common liner (19) to provide an annular space therebetween which is filled with activated charcoal (27). Fines media (25, 26) are positioned on opposite sides of the activated charcoal (27). The first, pleated filter (21) and the second, charcoal filter (27) are thus mounted contiguous to one another on opposite sides of separating wall (19, 25), and extend between the end covers (11, 12) to provide filtration for air being drawn through the filter unit.

Abstract: Diesel exhaust particulates are efficiently trapped by incineration cleanable ceramic monolith porous wall filter elements. A number of arrangements for high efficiency elements having high filtration area in compact units are disclosed.

Abstract: A fiber bed element and the method of making the same wherein a roving of glass fibers is fed into the annulus formed by a pair of concentric cylindrical screens, the screens being rotated as the roving is fed. A packing force is applied to the roving to compact the roving to a predetermined density between the screens, the packing force being applied in a direction generally parallel to the axis of the screens such that the roving is compacted in an axial direction with each turn of the roving being sandwiched between adjacent turns. This fiber bed element is useful for removing aerosols or mists from gases.

Abstract: A flame arresting filter element for air intake systems has an outer ring of pleated filtering paper and an inner, concentric ring formed of expanded metal foil, longitudinally stretched and laterally compressed so as to be adapted to diffuse and quench frames resulting from engine backfire. The inner ring is coated with a relatively inert, cohesive substance to provide a unitary structure. The two rings are provided with resilient end caps.

Abstract: An electrostatic air filter comprising a first planar electrode, having planar surfaces, which is positioned, configured and dimensioned in such a manner that portions of a planar surface of the first planar electrode face other portions of its planar surfaces. A second planar electrode, also having planar surfaces, is positioned, configured and dimensioned to be supported between the facing planar surfaces of the first planar electrode with portions of its planar surfaces in facing relationship to facing portions of the first planar electrode.

Abstract: Cartridge filters of enhanced capture potential for fine contaminants, prepared by selective interaction of melamine formaldehyde bonding resin and polyamido/polyamine-epichlorhydrin charge modifier.

Abstract: A pocket filter in the form of a filtering block is provided with an assembly of channels open at one end to receive gas from which dust is to be removed, and is interleaved with the channels of another assembly open towards the other end and delivering the gas from which the dust has been removed. These channels have a generally square-shaped cross-section, and are connected to each other, for example by stitching lines, along their edges. During operation, the initial shape provided for the cross-section of the channels of the two above mentioned assemblies is maintained by tensioning these two assemblies with tensioners or the like, on which are fixed the edges of the outer channels of the filtering block.

Abstract: An air filter unit of the pleated media, high efficiency type wherein the media pleat edges are sealed to the supporting frame to prevent bypass of air with a ceramic adhesive and fibrous ceramic mat which allows the unit to be exposed to high temperatures (e.g., up to 2000.degree. F.) without danger of seal breakdown. While in the form of a slurry the adhesive is applied, for example, with a trowel to the zig-zag pleated edges of the media which, together with corrugated spacers, forms the filter core. The latter is then surrounded on four sides by the compressible mat of fibrous ceramic material and inserted in a box-like support frame with the slurry filling the space between the pleated edges of the media and the fibrous mat.

Abstract: A dimensionally stable filter structure for high temperature applications and method of making it. The filter structure comprises at least one batt of relatively brittle fibers, known to possess outstanding degredation resistance at elevated temperatures, stitch-knitted with high temperature and corrosion resistant yarns.

Abstract: A respirator filter is formed of felt impregnated with rosin, which is fractured throughout and is characterized by loosened fibers at one surface thereof. The method of forming the filter entails splitting a batt with fractured rosin impregnation to separate and displace the fibers at the plane of cleavage from their prior felted position.

Abstract: A method for forming a filter of electrically charged electret fiber material, consisting of a high molecular weight, nonpolar polymeric substance, comprising drawing, charging, and fibrillating a foil of said high molecular weight substance. The fibrillated foil is wound and then crimping is effected.

Abstract: A novel adsorptive nonwoven fabric having good strength as well as good permeability and softness and a method of making the same is disclosed. This product consists essentially of supporting fibers containing a heat-fusible fiber and an adsorptive material, said supporting fibers being disintegrated in air before they are admixed with an adsorptive material, and a web is formed from the final mixture followed by being subjected to a heat treatment at a temperature above the melting point of said heat-fusible fiber to firmly fix said adsorptive material in the web by heat-fusion of the heat-fusible fiber.

Abstract: A gas filter element and method of manufacturing the same, wherein the gas filter element is equipped with a substantially wedge-shaped filter pocket containing side walls composed of filter material and a number of areal spacer holders dispositioned in the pocket and extending transversely to the side walls approximately in the direction of flow of the gas. The spacer holders or spacers are connected along lengthwise edges thereof with the side walls. These spacer holders form oppositely situated sides of a tetrahedrally formed hose section composed of course mesh material.

Abstract: 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 axially of the tube. When the filter is in its tubular form, the folded pleat ends are disposed at the exterior of the tube.

Abstract: A layer of open cell polyurethane foam adhered to a layer of a non-woven fibrous material of fine porosity relative to the foam results in an efficient fluid (e.g., air) filtering medium having a high capacity for retaining particulate contaminants. The combined layers are useful as an air filter element.

Abstract: A vapor filter cartridge for use in a volumetrically controlled crankcase ventilation system, which utilizes a cylindrical frame of expanded metal surrounded by a vapor filter cloth. The bottom end of the cylinder is sealed by a shallow cup type closure, having a central opening. The closure is attached and sealed and attached to the cylindrical wall by means of a thermosetting rubber-like material. A support flange is provided of molded thermosetting rubber-like material which is molded to the second end of the cylindrical frame. The flange serves as a structural member to support the cartridge. Also, because of its compliant nature, it serves as a sealing gasket between the support and cover structure of the ventilation device, and the top edge of a jar which is used to catch the liquid and larger particles which are carried into the jar from the crankcase space of the engine.

Abstract: A filter assembly is provided for a cylindrical radial flow fluid supply having a combustible gas generator which is used to inflate a confinement for an occupant restraint system upon the occurrencee of a collision. The filter assembly includes a plurality of layers of filter material and support elements pressed to a densely packed flat form, rolled, closed, and inserted in the housing of the fluid supply adjacent the combustible gas generator.

Abstract: An air filter of the type having a porous filter medium body layer supported in a complementary unitary frame has a perforated panel supportingly engaging one face of the layer with folded up narrow panels along the edges of the layer, narrow retainer panels overlying the margins of the opposite face of the layer from the perforated panel, and each of the retainer panels being provided with spaced extensions which overlap adjacent the corners of the layer and are secured together as by means of adhesive, there also being anchoring adhesive securing two of the retainer panels to the filter layer. The overlapping extensions are perforated.An efficient method of making the air filter is provided.

Abstract: A filter element for aerosols and finely divided solid particles suspended in a gas, is formed by depositing a septum of microscopic and submicroscopic unsintered fibers of fibrillatable polytetrafluoroethylene (hereinafter referred to as PTFE) as a random network on a supporting screen. The filter so formed is especially effective to remove liquid and solid particles of micron and submicron size suspended in a gaseous medium to be filtered.A process is described for separating contaminant solid and liquid particles less than about 5 .mu. (micron) in diameter from the gas in which the particles are suspended, comprising introducing primary particles of fibrillatable PTFE less than about 1 .mu.

Abstract: Beta Glass fibers are dispersed in a solution containing hydrochloric acid nd a hydrophobic fumed silicon dioxide treated with a silane thereby forming a slurry which is subjected to a sonic probe whereafter other glass fibers are mixed into said slurry and the mixture is formed into a glass fiber filter.

Abstract: An air filter panel comprising a filter element of fibrous material supported at its marginal edges by a stiff paper frame is provided. The strip of stiff paper is scored along two spaced longitudinal lines and folded away from the longitudinal lines to form a trough for receiving the filter element, the strip also being folded transversely to form a closed configuration surrounding the filter element to receive the marginal edges of the filter element in the trough. The frame is triangular in cross section with an outer wall, a flat rear wall extending inward from the outer wall toward the filter element, and an inclined front wall extending inward from the outer wall toward the filter element and sloping toward the rear wall. The front wall terminates in a flange disposed in a parallel relationship with the rear wall. The flange is secured to the rear wall with the filter element compressed therebetween to hold the frame and filter element together.