Cuno, Inc.

Other

Amf Gmbh

Robert G Barnes

Chaokang Chu

George T Emond

Asit K Roy

Eugene A Ostreicher

Mark T Meyering

Bruce G Taylor

William Contaxis, Iii

John L Pulek

Arto Artinyan

An encapsulated filter cartridge assembly is disclosed which is adapted and configured for reception within an elongated cartridge housing of a filtration system. The filter cartridge assembly includes an elongated filtration element, a connector head positioned adjacent an upper end portion of the filtration element, an outer shell extending axially from the connector head and encapsulating the filtration element, and an expansion joint integrally formed in the outer shell to facilitate expansion of the outer shell within the elongated cartridge housing.

Expandable encapsulated filter cartridge assembly

A compressible differential pressure energized seal (18) coacting between a filter element (10) and the like and a housing (21) comprises a compressible portion (35) having a large open end (36) and a small open end (37), the large end (36) directed toward and contacting the housing (21 ) and the small end (37) directed toward the filter (10) element; and an annular flange (38) integrally attached to the compressible portion (35) at its small end (37) and extending outwardly, the flange (38) operatively communicating with the filter element (10). The seal (18) may also include at least one flap (43) to center the filter element (10) to which it is attached onto a centering rod (31 ) carried within the housing (21 ). Such a seal (18) is compressed when the element (10) is operationally enclosed within the housing (21 ) to provide a leak-proof seal during operation and is self-energizing during operation such that as the differential pressure increases, it more forcefully engages the sealing surface.

Compressible differential pressure energized seals for filter elements

The present invention sets forth an improved cell type filter cartridge in which the individual cells contain a separator disc having stiffening members formed at the central aperture of the cell and connected to a plurality of the separating ribs in spaced relation to each other. The coaction of the two or more discs with the separator ribs provides for a rigid, box-like structure of the ribs to impart a substantial cantilevered strength to the ribs. Additionally, at least one of the stiffening discs is positioned at or near the ends of the separator ribs to act as a load-bearing surface to prevent media intrusion of the filtering medium and thereby maintain the area of the flow path of the filtered liquid as it passes through the central aperture of the disc.

Separator for cell type filter element

A cationic charge modified microporous membrane is provided. The membrane comprises a hydrophilic organic polymeric microporous membrane having bonded thereto, through a cross-linking agent, a charge modifying amount of a cationic charge modifying agent. The charge modifying agent is an aliphatic amine or polyamine, preferably tetraethylene pentamine, and the cross-linking agent is an aliphatic polyepoxide having a molecular weight of less than about 500, preferably 1, 4 butanediol diglycidyl ether. The microporous membrane is preferably nylon. The process for applying the charge modifying agent to the membrane, preferably comprises contacting the membrane with an aqueous solution of the charge modifying agent and then contacting the membrane with a substantially aqueous solution of the cross-linking agent. The preferred process uses high purity water, i.e. water having no significant ionic content, to produce a membrane suitable for use in filtering ultra pure (18 megohm-cm resistivity) water for use in producing electronic devices. Such a membrane exhibits an advantageously low 'flush-out' time compared to known cationic charge modified microporous membranes and unmodified microporous membranes.

Process for charge modifying a microporous membrane

Charge modified microporous membrane

A reinforced laminated filtration membrane is provided. The membrane comprises:

Reinforced microporous membrane

A process for producing an integral single layer polymeric microporous filter membrane within which a reinforcing web is embedded. The process comprises passing a reinforcing web through a first reservoir of casting solution of polymer and then simultaneously calendering both sides of the coated web to provide for penetration of the solution into the web and to remove substantially all entrapped air from the web. The calendered reinforcing web is then passed through a second reservoir of casting solution and then through a quenching bath to form micropores throughout the coatings.

Process for producing reinforced microporous membrane

A cationic charge modified microporous membrane is provided. The membrane comrises a hydrophilic organic polymeric microporous membrane having bonded thereto, through a cross-linking agent, a charge modifying amount of a cationic charge modifying agent. The charge modifying agent is an aliphatic amine or polyamine, preferably tetraethylene pentamine, and the cross-linking agent is an aliphatic polyepoxide having a molecular weight of less than about 500, preferably 1, 4 butanediol diglycidyl ether. The microporous membrane is preferably nylon. The process for applying the charge modifying agent to the membrane, preferably comprises contacting the membrane with an aqueous solution of the charge modifying agent and then contacting the membrane with a substantially aqueous solution of the cross-linking agent. The preferred process uses high purity water, i.e. water having no significant ionic content, to produce a membrane suitable for use in filtering ultra pure (18 megohm-cm resistivity) water for use in producing electronic devices. Such a membrane exhibits an advantageously low 'flush-out' time compared to known cationic charge modified microporous membranes and unmodified microporous membranes.

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Meriden, CT, United States of America

Robert G Barnes