Abstract: A swimming pool leaf trap and main drain assembly collects and removes leaves and other debris from the floor of a swimming pool. The assembly includes a main drain recessed in a swimming pool floor and formed with a drain opening connected to a return line. The main drain removably houses an apertured basket that receives leaves, the normal downward flow of swimming pool water through the main drain trapping the leaves within the basket. The cover of the basket is provided with a lifting ring which is engaged by a brush handle to raise the basket to the surface. During such upward movement, the downward force of water through the basket holds the leaves within the basket. An anti-vortex plate covers the main drain opening when the basket is removed from the main drain. The cover of the basket is released from the basket at the surface to permit removal of the leaves trapped within the basket.

Abstract: It has long been known that there is an interfacial tension between immiscible liquids such as water in oil. It has long been known that membranes when wetted by one of two immiscible liquids will preferentially allow the passage through the membrane of the liquid with which the membrane is wetted, and will reject the other liquid with an opposing force that is proportional to the interfacial tension of the liquids. The opposing force is inversely proportional to the diameter of the pores of the membrane, and can be several inches of water head for pores a couple thousands of an inch in diameter. According to principles of the present invention, a structure is provided which augments the small water opposing force of the above described phenomenon with opposing forces of other mechanisms to produce a combined force which will separate water, without utilizing dirt collecting and annoying water coalescing filters, such as layers of glass fibers, etc.

Abstract: A fluid filtering device comprising a housing having an interior chamber with an open top and an inlet and outlet open to the chamber. An annular seat is secured to the housing within the chamber in a position spaced downwardly from the open top so that the seat protrudes inwardly into the chamber and forms an axially extending surface having a seal member. A filter element is removably insertable into the chamber through its open top and to a filtering position in which the filter element is positioned in between the housing inlet and outlet. The filter element includes an outwardly flanged portion which abuts against the top of the seat when the filter element is in its filtering position while the seal member sealingly engages an axially extending surface of the filter element. A cover is detachably secured across the open top of a housing while an elongated handle is secured at one end to the filter element and its other end is positioned adjacent the intersection of the cover with the housing.

Abstract: Filtration apparatus utilizing gas pressure to drive a liquid to be filtered having a housing, a two-chambered filter cannister and a cannister sealing assembly mounted in the housing and connected with a source of gas under pressure in such manner that both filtration and sealing operations are carried out under a substantially equal head of pressure.

Abstract: The filter device of this invention comprises a housing with an inlet chamber and an outlet chamber separated by a deformable microporous membrane, the outlet chamber containing a perforated membrane support surface of concave compound curvature which is spaced from the wall of the outlet chamber, the deformable membrane being in contact with and conforming to the compound curvature of the support surface when fluid flows through the membrane from the inlet chamber to the outlet chamber.

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 filter for use within a storm drain sump which has a fluid outlet through a wall of the sump, the filter includes a bag-like body member having a cylindrical body portion fabricated from resilient mesh-like synthetic material. A base portion of the filter defines a toroid-shaped section. A weighted material is placed within the toroid-shaped section. Wedge-shaped spacers are axially aligned and secured to an outer face of the cylindrical body portion of the filter. A suspension plate is secured to the body member to support the filter in the storm drain sump.

Abstract: A filter assembly (10) for use in the filtration of medical treatment liquids is disclosed. The filter assembly (10) includes a strip of porous filter media (12), first enclosure means (14), and a second enclosure means (16). An inlet connector (18) is connected to inlet end (20) of the filter assembly (10) and an outlet connector member (22) is connected to an outlet end of the filter assembly (10). The first and second enclosure means (14), (16) are formed of strips of flexible plastic material having longitudinal edges (30), (40) which are ultrasonically welded to the filter media (12). Dimples (36), (42) are formed in the first and second enclosure means (14), (16), respectively, and are ultrasonically welded to the filter media (12).

Abstract: This invention relates to a coffee filter comprising a drip catcher, a container and a filter insert designed to be introduced into the container, the filter insert comprising filter surfaces of a perforated metal foil and the container comprising a single outflow opening in its base.

Abstract: This invention relates to a permanently useable coffee filter comprising a funnel-shaped container, of which the base is provided with at least one outlet opening, and a funnel-shaped filter insert which is inserted into the container and of which the filter surface is situated at a distance from the wall of the container.

Abstract: A liquid filter having a housing which includes a chamber enclosed by a cap. A filter is positioned within the chamber and includes a flange which makes a hermetic seal with the housing.

Abstract: A device for the chemical and/or physical treatment of liquids which comprises a flowthrough vessel having an inlet and an outlet and is receptive of a treatment agent therebetween. The vessel comprises a substantially cylindrical tube having one end at the outlet and a conically widening tube section connected to the other end of the cylindrical tube. A permeable carrier is mounted in the cylindrical tube at the outlet end to support the treatment agent placed in the cylindrical tube.

Abstract: A liquid filter having a housing which includes a chamber enclosed by a cap. A reticulated basket is fitted within the housing chamber and supported by the housing. A filter bag is positioned within the reticulated basket and includes a flexible flange which engages the housing to secure the bag within the basket without the aid of the filter cap.

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 compensating plate for a pressure filtration cell including a generally cylindrical liquid-feeding vessel and a base removably connected to the feeding vessel by means of a flanged joint, the removable base forming a filter holder, in which an outer edge of the plate is engaged in a flange between the liquid-feeding vessel and the filter holder and, on its upper side, the outer edge of the plate is sealed against the liquid-feeding vessel by means of a circumferential seal. The compensating plate has a central opening corresponding to the size of a filter placed in the filter holder, the plate having a slight conical depression toward the said opening.

Abstract: A colander is mounted within a stackable base adapted to rest on a surface and to support the colander above the surface. The base includes a top wall, which receives and retains the colander, and supporting legs with the colander disposed between them. These legs are shaped to permit a paired colander and base to be stacked within other paired colanders and bases.

Abstract: A plastic vacuum suction filter or funnel is composed of a cut tube wherein a thrust ring is mounted in close contact with the inner wall, which thrust ring, together with a support, carries the sieve plate; the support resting on a slightly inclined funnel bottom.

Abstract: A filter which includes a container-shaped housing having a top wall with multiple openings therein. A filter element is fitted into each housing top wall opening. A cover having an offset portion spans the housing top wall with the offset portion thereof being located spacedly above each of the filter elements. The filter housing includes a liquid outlet. A liquid inlet is provided which directs liquid into the space under the offset portion of the cover. The liquid then passes downwardly through the filter elements, into the interior of the housing, and out the liquid outlet in the housing.

Abstract: A filter for use with sterile slurries or the like comprises a filter basket and means for suspending the filter basket inside a housing, the suspending means for the basket including a sealing O-ring. The O-ring is disposed so that it never comes into contact with the slurry and serves to seal off the space above the basket from the space below the basket so that positive pressure or a vacuum may be used to assist the filtration process. The bottom of the filter basket forms a filter plate and means are provided for supporting the bottom surface of the filter plate. This supporting means includes a distribution plate which is attached to the basket and which has a plurality of inverted T shaped ribs attached to its lower surface.

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 filter assembly is provided for filtering fluid polymeric material, and having a filter element composed of a sheet of filter material formed in a closed configuration defining therewithin the sides of a chamber open at each end; a first closure member having a sealing surface engaging in a fluid-tight seal one end of the filter sheet at such surface under compression by fluid polymeric material, and having at least one fluid passage therethrough in communication with the chamber; and a second closure member having a sealing surface engaging in a fluid-tight seal the other end of the filter sheet at such surface under compression by fluid polymeric material, and having a pressure-receiving surface upstream of the filter element responsive to relatively higher upstream differential pressure of fluid polymeric material to press the sealing surfaces of the first and second closure members into fluid-tight sealing relationship with the ends of the filter sheet so that the higher the differential pressure of flu

Abstract: A lint filter for an automatic washing machine having a rotatable walled basket for receiving items to be washed and means for recirculating liquid therein. The lint filter comprises an annulus channel member having an inside wall, an outside wall, and perforations for liquid to pass therethrough. The annulus channel member is secured to the wall of the basket inwardly thereof. There is provided a plurality of elongated protuberances attached to the inside wall of the annulus channel member with their bases positioned toward the rotational axis of the basket such that during rotation of the basket lint will be removed from the protuberances by centrifugal force.

Abstract: A deep fat fryer trap receivable in the fryer well has imperforate trap portions extending along opposite margins of the bottom wall and an oil straining portion along a narrow medial portion of the bottom wall. The side walls have upper marginal edges closely fitting the well walls. Oil straining portions are also disposed in the side walls spaced upwardly from the bottom.