Described are filter cartridges, filter apparatuses, and related methods that involve a filter cartridge that includes a cartridge support that includes centering surfaces, a helical strand, or both.

The disclosure describes a porous membrane including the following: at least one polymeric feature on a surface of a porous membrane wherein the at least one polymeric features are bonded to the membrane using a nanoscale injecting molding device. Another aspect of the disclosure includes a porous membrane including the following: a first film layer; a second film layer; at least one polymeric feature between the first film layer and second film layer, wherein the at least one polymeric feature is bonded to at least the first film layer.

The present disclosure relates to a vacuum filter that incorporates a large area pleated filter element having pleated hydrophilic membrane configured along slanting surface in pyramid shape and incorporated with in a filter housing that can be accommodated in neck of a filtrate container. The disclosed configuration reduces overall height of the filtering system improving its stability and reducing space requirement. Further, top portion of the filter housing is configured to receive either a feed cup for direct feeding of feed liquid by pouring in the cup or a fitting with tube that can be used to suck the feed from a feed solution container under action of a vacuum thus allowing universal use. In another embodiment, a single hydrophobic membrane is provided to avoid problems of low flow due to bubbles coming with the feed solution and also to allow restart of filtration without air lock.

A liquid filter cartridge is provided. Preferred seal arrangements are provided, to provide for preferred axial load conditions, with respect to one or more of the end caps of the cartridge. Some cartridge configurations provided include no core structure or outer liner structure therein, to support axial load. Assemblies using the cartridge, and methods of assembly and use, are provided. The liquid filter cartridge can be a serviceable cartridge, or it can be retained permanently in a housing.

A device, which is suitable for the processing of at least one fluid, is provided with at least one elongated foil, which is formed in a number of reciprocating foil layers. Between two opposite layers of foil, a spacer is situated that is permeable at least parallel to the foil layers. The foil layers and interposed spacers extend spirally around a central axis, wherein folding lines between two foil layers extend substantially parallel to the central axis. Each spacer is coupled to at least an end near the central axis with a support extending parallel to the central axis where, of the supports near the central axis, first supports are situated between two foil layers, which foil layers are connected to one another near the central axis, whereas second supports are situated between two successive first supports.

The disclosure describes a porous membrane including the following: at least one polymeric feature on a surface of a porous membrane wherein the at least one polymeric features are bonded to the membrane using a nanoscale injecting molding device. Another aspect of the disclosure includes a porous membrane including the following: a first film layer; a second film layer; at least one polymeric feature between the first film layer and second film layer, wherein the at least one polymeric feature is bonded to at least the first film layer.

Provided is a hydrophilic porous membrane including a porous membrane and a hydroxyalkyl cellulose (preferably, hydroxypropyl cellulose) retained in the porous membrane, the hydroxyalkyl cellulose having a weight-average molecular weight of 10,000 or more and less than 110,000. The hydrophilic porous membrane of embodiments of the invention has high water permeability and can pass an integrity test in the case of being used as a filtration membrane of a filter cartridge. Also provided is a method for producing the above-mentioned hydrophilic porous membrane, the method comprising causing a hydrophilizing liquid including 0.005% to 0.500% by mass of a hydroxyalkyl cellulose having a weight-average molecular weight of 10,000 or more and less than 110,000, to permeate a porous membrane.

Provided are certain composite membranes useful for removing various impurities from liquids. In certain aspects, the composite membranes comprise a hydrophobic polymer having a polyamide coated thereon, and in other aspects, such composite membranes having certain acrylic polymers coated thereon. The composite membranes are useful in the removal of various impurities in liquids, such as those encountered in industrial and life sciences processes.

The present application relates to a multizone, unsupported, microporous, high throughput membrane. The membrane includes a first microporous zone, a second microporous zone, and a third microporous zone, where the third microporous zone is positioned between the first and second microporous zones, with the first, second, and third microporous zones being integral with one another. Further aspects of the present application include a process for making the membrane and a filtration cartridge with the membrane of the present application.

A filter unit for a mixing apparatus includes a hydrophilic filter and a hydrophobic vent filter. The hydrophilic filter is configured to receive a fluid including a liquid and gas. The hydrophilic filter is further configured to sterilize the liquid. The hydrophobic vent filter is configured to receive the gas from the hydrophilic filter. The hydrophobic vent filter further includes a vent and a membrane configured to separate an interior of the filter unit from an exterior of the filter unit, the gas being vented from the filter unit by flowing across the membrane and out of the vent. In some embodiments, the filter unit further includes a defoaming device configured to receive gas, foam comprised the liquid containing trapped gas, and some of the liquid from the hydrophilic filter and is further configured to release at least some of the gas from the foam.