Pall Corporation

John R Gerringer

Peter J Degen

Richard F Salinaro

Moira H Bilich

Trevor A Staff

Jeffrey K Chambers

The present invention provides a filtration medium comprising an ultrafiltration membrane and a monomer surface coating thereon of an acrylic or methacrylic acid monomer having alcohol functional groups, wherein the filtration medium after having been fully dried is characterized by having a titer reduction of at least about 10.sup.3 with respect to PP7 bacteriophage and a critical wetting surface tension of at least about 70 mN/m. The filtration medium preferably further comprises a fibrous nonwoven web embedded in the membrane. The present invention also provides a method of filtering a fluid through the present inventive filtration medium, as well as a method of preparing such a filtration medium.

Filtration medium

A system and method for removing contaminants in a fluid, particularly water from lubricating oil, is provided which may comprise a particulate zeolitic adsorbent in conjunction with a non-porous PTFE barrier that has been modified to be permeable to water and impermeable to oil. Such a system is capable of reducing the level of water in lubricating oil to less than 100 parts per million.

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Port Washington, NY, United States of America

John R Gerringer