A filter for treating liquids having a filter compartment separated into an upper inlet chamber and a lower underdrain chamber. An inlet pipe, having a control valve associated therewith, communicates with the inlet chamber. A backwash storage compartment is positioned adjacent the filter compartment. A connecting pipe is provided having a first end in communication with the underdrain chamber and a second end in communication with a backwash pump which permits the passage of filtered liquid fro...

An upflow filter of the type in which a liquid influent (e.g. water) is directed upwardly through buoyant filter media particles includes a porous supporting member, preferably in the form of a screen having openings through it that are larger than the nominal size of the media particles. A layer of particulate material is positioned on the upper surface of the porous supporting member and has a nominal particle size that is greater than the size of the openings through the supporting member. Th...

A filter for separating material of greater density from material of lesser density, comprises a hollow body having an inlet at one end thereof for the materials to be separated, and outlets at the other end thereof for the separated materials. A passage joins the inlet to the outlets and has two sets of separator vanes disposed therein. Alternatively, a single set of separator vanes is disposed in the passage. Each set of vanes is positioned in the passage so as to define a first, convergent fl...

A filter for treating fluids, particularly tobacco smoke, is described having a filter media prepared from a wide variety of fungal mycelia or yeasts.

A multi-layer filter material assembly. The assembly includes a filter medium which consists of a single sheet formed of fibers of a glass having a low coefficient of thermal expansion. The filter medium is supported on each side by at least one sheet of bonded synthetic fibers and a sheet of metallic wire mesh. The two sheets of metallic wire mesh form the two outermost layers and the entire assembly is formed into a pleated configuration.

Filters for treatment of jet fuels and light hydrocarbons include clay filter material to remove surfactants and other contaminants. One of the most common systems has a series of replaceable filter elements, each in the form of an elongated annulus, about 7 inches in diameter and about 18 inches long, where the fluids flow from outside to inside through the clay filter material. These fiter elements are stacked with one or more in series on a common collector tube for the filtered fluids. The u...

A filter consisting of two endless belts of filter material having runs pressed together, of means pressing a run of one belt against the adjacent run of the other, and of a feed device for introducing the slurry between the runs.

A filter for the removal of dust from gases The filter comprises filter elements, on which a flat filter material assembled in superficial honeycombs is installed, which increases the filtration surface. The increased filtration area increases the output of the filter in proportion to the increase in the filtration area, which makes it possible to use a housing with smaller dimensions and to reduce the amount of metal needed for the filter.

A filter includes a cylindrical pleated filter element having a longitudinal axis, an inner and outer periphery, first and second end surfaces, and a plurality of longitudinal pleats. First and second end elements are sealingly arranged with the first and second end surfaces, wherein at least one of the end elements is an open end element. The filter element is a pleated composite that includes a filter medium, an upstream drainage medium and a downstream drainage medium. Each pleat includes a c...

A filter cartridge for use in filters, for example, water filters, includes an inlet for water to be purified and an outlet for filtered water. Partitions within the cartridge define an elongated, tortuous water flow path between the inlet and outlet. Filter pads and activated carbon, or another suitable absorbent material, is disposed in the flow path. The cartridge of the present invention provides effective odor and taste filtering of the water because the water passes over a large area of fi...