Cuno, Inc.

3m Innovative Properties Company

Clifford L Schorr

John L Pulek

William A Larsen

Francis J Swiatek

Art Artinyan

C Thomas Paul

Thomas J Hamlin

Jeffrey A Lucas

Daniel K Olsen

Laurie Iturrino

Eric Cizek

Charles Thomas Paul

A fluid filtration unit having two or more filter medium layers and/or zones, at least one of the layers/zones having a different particle retention capability disposed on each side of a non-filtering separator element. The filter medium are presently preferably positioned such that each succeedingly distal filter layer or zone from the separator has a decreased particle retention capability than each proceeding filter layer or zone. The filter medium layer most proximal to the separator element may be separated from the separator by a support material for supporting such filter medium element and preventing collapsing of the medium into any separator conduit. At least one of the medium elements is formed from a material which swells in size due to fluid absorption with the various zones and the separator being operatively connected by a new and innovative edge seal. The new and innovative edge seal is presently preferably formed from a thermoplastic material having a modulus of elasticity which is sufficient to permit radial expansion of the edge seal when the unit medium swells in size.

Graded particle-size retention filter medium for fluid filtration unit with improved edge seal

A cell-type filter unit having two or more filter media layers and/or zones, at least one of the layers/zones having a different particle retention capability disposed on each side of a non-filtering separator element. The filter media are preferably positioned such that each succeedingly distal filter layer or zone from the separator has a decreased particle retention capability than each proceeding filter layer or zone. The filter media layer most proximal to the separator element may be separated from the separator by a support material for supporting such filter media element and preventing collapsing of the media into any separator conduit.

Graded particle-size retention filter medium for cell-type filter unit

A method for retrieving excess pharmaceutical process fluid from the hold-up volume of a primary fluid filtration device. The hold-up volume is the volume of excess process fluid which accumulates in the bottom of the filter housing below the outlet opening thereof. Because it is considered valuable, the excess pharmaceutical process fluid is retrieved from the lower housing (,) via a drainage port (,) formed therein below the level of the outlet. The excess process fluid is then filtered in a supplemental filtration device (,) that is connected to the drainage port. The supplemental filtration device has a smaller volumetric capacity than the capacity of the primary fluid filtration device.

Method for retrieving excess pharmaceutical process fluid from a filter

A fluid filtration device is disclosed which includes a capsule housing having an upper housing portion defining an axial fluid inlet and a lower housing portion defining an axial fluid outlet, a filter assembly including an elongated mounting post and a plurality of filtration cells supported on the mounting post in axially spaced apart relationship, and structure operatively associated with the mounting post and the lower housing portion for effectuating axial compression of the filtration cells relative to the mounting post when the mounting post is engaged in the lower housing portion during assembly.

Encapsulated lenticular filter cartridge

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Cheshire, CT, United States of America

Clifford L Schorr