Abstract: A filter assembly for fluid containing microbial agents comprises a base ining a first broad filter supporting surface for receiving an appropriate microbial filter membrane, and at least one fluid drain disposed therebeneath to conduct the fluid carrying the microbial samples away from the filter membrane. One or more cover plates may be detachably mounted over the filter supporting surface of the base to sandwich the filter membrane. The cover plates define a corresponding number of tapering inlet ports in axial alignment with the fluid drains disposed in the base to assist in the rapid passage of the microbe-containing fluid to the filter membrane. The inlet ports terminate in reduced-diameter orifices, and ring-like projections annularly disposed about the orifices compress the filter membrane between the cover plate and the base, and form a fluid-tight sandwiching seal that prevents the microbe-containing fluid from escaping past the exposed filter area.

Abstract: A sieve sheet having radially extending separating slots in order to subdivide the area of the sieve sheet into sieve segments. The separating slots are embedded with plastics material. The sieve segments may be arranged in a configuration differing slightly from a plane, thus stiffening the sieve.

Abstract: A coffee filter which may be used repeatedly is described. It comprises a funnel-shaped housing having an outlet port at the lower end. A filter of similar shape is fitted into the housing and is so dimensioned as to provide a clearance of between 0.2 to 1.5 mm. The filtering element is so dimensioned that the upper rim thereof forms a seal with the inner wall of the housing. The outlet port of the housing has a restriction in order to assume a continuous flow of the filtrate between the funnel-shaped housing and the filtering element.

Abstract: A lint separator and filtering device for preventing clogging of waste water drain openings by lint and other solid materials discharged from a clothes washer. The filter device comprises a frustro-conical shaped screen-like filter having an upper end defining an overflow opening, and a lower end containing means for attaching the filter device to a drain.

Abstract: Apparatus for washing parts such as mechanical parts using a cleaning solvent. A sink is provided to receive the dirty solvent which flows down a drain into a filter apparatus which includes a pair of concentric cylindrical containers positioned one inside the other and arranged to provide a circuitous path for washing solvent. Inside the inner cylindrical container is a bag which has the function of a filter element and also acts as a container for the dirt and other material filtered out of the solvent.

Abstract: A filter for liquids and particularly coffee comprises a container having a planar horizontal base formed with at least one filtrate drainage opening, and on its inner face formed with a plurality of radial ribs and a central support member which together support a generally planar filter element of thin sheet material in spaced parallel relationship to the base. In use the arrangement produces a toroidal circulation of liquid which prevents compaction of the filter cake and reduces clogging of the filter element.

Abstract: A coffee filter for coffee pots comprising a container, and a filtering element is disclosed. The container comprises a bottom surface having a plurality of openings and a lateral surface extending from the bottom surface around the periphery of the bottom surface. A plurality of axial ribs are connected to the inside of the lateral surface. The axial ribs are spaced equidistantly about the inside of the lateral surface. Each of these ribs has an inclined edge surface such that the surface defined by the inclined edges of the axial ribs is in the shape of an inverted truncated cone. The bottom edges of the axial ribs terminate in a supporting ramp which is a radial projection extending from the inclined edge of each axial rib. The filtering element is supported, and rests upon, the supporting ramp.

Abstract: A disposable two part filter assembly for use on the detachable tip of a laboratory pipette. It comprises a body member with an opening shaped and sized to engage the tip. Such body members may be provided for a wide range of tip sizes and shapes. Inserted within each of the body members is a filter element. The filter elements have essentially the same size and shape but may differ as to material and porosity.

Abstract: Microliter sized samples of filtered urine or the like are obtained by taking up a few drops of urine into a bulb-type micro-syringe inserting the nozzle thereof tightly into the inlet passageway of a micro-filter having a disc of filter paper as the filtering medium held firmly between the inlet passageway and an outlet passageway and squeezing the bulb of the micro-syringe to force the urine through the filter paper. The outlet passageway is constricted in size and shape to discharge the filtered urine in drops. The filtered urine then comes through in uniform drops of predetermined size which are utilized in a testing procedure, for example, in a direct agglutination test for pregnancy.

Abstract: A tank containing a bed of particulate material, e.g. a sand filter bed or an ion exchange bed, has a bed-supporting bottom structure formed by upper and lower bottom plates rigidly connected with each other through a plurality of vertical sleeves opening into the spaces above and below the tank bottom structure. Openings in the wall of each sleeve connect the interior of the sleeve with the compartment formed between the bottom plates. A strainer unit is removably inserted in each sleeve through the lower end of the sleeve and passes liquid between the bed and the compartment between the bottom plates by way of the openings in the side wall of the sleeve.

Abstract: A device for the preparation of filtered coffee is described. It has a permanent filter disk which can be reused, thus eliminating the need for frequent replacement.

Abstract: A reusable coffee filter with a pot-shaped hotwater container and a filter strainer adjacent an opening in the bottom of said container. The filter strainer is made of metallic sieve sheets having perforations flaring out in the flow direction. On top of the hotwater container a distribution plate is supportably held which has a plurality of holes distributed over an area corresponding to the vertical projection of the opening of the filter strainer in order to ensure a good wetting and extraction efficiency of the coffee powder.