Abstract: A dual filter system for heaters and airconditioners comprising releaseably securable throwaway secondary filter secured to a disposeable or permanent primary filter.

Abstract: Lower inhalation resistance in respirator cartridges designed for protection against aerosols is accomplished with lower production cost and improved design distributing aerosol loading over greater surface area of filter material.

Abstract: A cartridge including a sheet of filtering media in annular form through which air is passed as it moves in a generally toroidal path within an enclosed housing due to rotation of a computer tape disc, or the like, mounted adjacent the cartridge within the housing. The cartridge includes a rigid body portion supporting the filter media in a generally conical plane within the annular body. The body portion is initially formed as two separate, mating halves which engage the media about its inner and outer peripheries when joined.

Abstract: Individual disposable nose and mouth filters, in combination, each of which is comprised of a sheet of a suitable air filtering material, sized and configurated respectively to loosely cover the mouth and nostril portions of the face of a wearer, continuous strips of a suitable pressure sensitive adhesive tape are engaged in a peripheral relation to outer peripheral edge areas of the respective filters and outer periphers of the adhesive tape, normally covered by removable backing strips, are extended beyond the filters for secure engagement with face areas surrounding the mouth and nostril areas of the wearer's face.

Abstract: A fluid filter is disclosed which separates gas from liquid and vents the separated gas from the filter. The filter includes a vented housing through which the fluid stream passes. Liquid-wetting filter means carried in the housing in the path of the fluid stream permits the passage of liquid only. Gas separated from the fluid is vented through vent opening means which is covered by a liquid-repellent filter to permit the passage of gas only. An automatic, pressure sensitive control means may be used to seal the vent opening means against the entry of ambient air but to automatically release separated gas from the filter. The liquid-repellent filter may be secured to the housing by a mechanical bond between the housing and a fibrous backing carried by the filter, or a continuous band of medical grade tape may be used to attach the filter to the housing.

Abstract: A fluid filter is disclosed which separates gas from liquid and vents the separated gas from the filter. The filter includes a vented housing through which the fluid stream passes. Liquid-wetting filter means carried in the housing in the path of the fluid stream permits the passage of liquid only. Gas separated from the fluid is vented through vent opening means which is covered by a liquid-repellent filter to permit the passage of gas only. An automatic, pressure sensitive control means may be used to seal the vent opening means against the entry of ambient air but to automatically release separated gas from the filter. The liquid-repellent filter may be secured to the housing by a mechanical bond between the housing and a fibrous backing carried by the filter, or a continuous band of medical grade tape may be used to attach the filter to the housing.

Abstract: A disposable box filter is provided comprising a box housing in at least two portions and having a fluid chamber with two fluid ports, and a filter element in corrugated sheet form extending across the fluid chamber, held by the housing across the line of flow between the fluid ports, with the corrugations supported in a fixed uniform spacing against differential fluid pressure and fluid flow.

Abstract: An improved filter of the cartridge type having concentric inner and outer filter elements is disclosed. The elements are formed of non-woven polypropylene fibers. In a preferred embodiment the outer element is formed of a laminate including a supporting layer of a continuous filament and a filtering layer of randomly oriented polypropylene fibers. The outer element is pleated and the space between the elements is filled with particulate, activated charcoal. The axial ends of the filter components are encapsulated in plastisol end caps to secure them together, and to form a sealable working surface to be engaged by the filter housing.

Abstract: A filter element is fitted into a filter can and a mass of hot-melt adhesive between the filter element and the can is thermally activated and allowed to cure to hold this filter element in place. A bead of hot-melt adhesive is applied to the rim of the can and the edge of a cover is applied over this bead which may be heated to its softening range. Thereafter the rim of the can is bent over the edge of the cover and this bent-over rim is heated to the melting point of the hot-melt adhesive so as to secure the two together once the hot-melt adhesive has cured.

Abstract: 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 the opposite wedge end faces, and a plurality of laminar spacing elements with each pocket extending from adjacent the open end toward the wedge edge, each spacing element being secured to the opposite inclined wedge faces, each filter pocket being rendered self-supporting by the securing of the sub-elements to one another and the securing of the spacing elements to the pocket. Advantageously the filter pockets each comprises fusible fibers, the pocket halves being joined to one another by fusion and the spacing elements being secured to the pocket by fusion.

Abstract: 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, and a mating channel in the cover receives and positions the element's remaining side edge. Fluid tight seals secure the four edges of the filter element in the trough and channel and secure the cover to the container.

Abstract: A bacteria filter has a base member with an open circular groove in which an adhesive bonding material anchors one end of a generally cylindrical filter element. The filter element has longitudinally extending pleats and the opposite end of the filter is adhesively secured in an open circular channel in an end cap element opposing the base member. A housing for the filter is sealed to the base member in spaced surrounding relationship with the filter element and has an inlet passage therethrough whereby air may enter the filter device through the inlet passage, flow through the filter element, and be emitted through the outlet passage in the base member. The method of assembling the filter device includes a unique method of retaining the pleated filter element in the desired cylindrical form while bonding the filter element to the base member and/or end cap.

Abstract: A glass-enclosed integral glass and ceramic filter unit is described for filtering sulfuric acid or other liquid solutions which do not attack silica and in which the sole communication between a first and a second chamber within a totally enclosing glass housing is through the pores of a ceramic filter membrane. This microporous ceramic membrane is connected to the interior of the glass housing by a glass seal wall member fusion bonded thereto advantageously providing an integral filter unit without any mechanical pressure seals or gaskets or other sealing elements having joints through which finely divided particulate matter could by-pass the filter membrane.

Abstract: A filtering attachment for the air intake of an automobile passenger compartment. A large rectangular sheet of laminated foil, vinyl and paper has a central opening over which is mounted a filter unit. The filter unit comprises two layers of non-woven paper heat sealed together to form a plurality of adjacent pockets, each of which contains pieces of activated charcoal. A fine mesh screen is mounted in overlying relationship to the filter unit. The attachment is mounted in overlying relationship to the air intake of the automobile so that all air entering the passenger compartment passes through the filter unit.