Patent ID: 8459470

Claim:
A filter device comprising: a fluid inlet; a fluid outlet; a filter media fluidly connecting the fluid inlet and the fluid outlet; and wherein the filter media comprises a nonwoven substrate having average fiber diameter of 1 to 6 micrometers, and a void volume of 50 to 95%, a tensile strength of at least 4.0 Newtons prior to grafting and a polymer grafted to the surface of the nonwoven substrate; and wherein the grafted polymer comprises polymerized monomer units of: a) 80 to 98 wt. % of grafting aminoalkyl (meth)acryloyl monomers, b) 2 to 20 wt. % of grafting poly(alkylene oxide) monomers; c) 0 to 10 wt. % of second hydrophilic monomers; and wherein the filter device further comprises a separator element; an edge seal; and wherein the separator element comprises a central core in fluid communication with the fluid inlet; a first side; and a second side; and wherein the filter media further comprises a first media disk positioned on the first side of the separator element and having an outer circumferential edge and an inner circumferential edge; and a second media disk positioned on the second side of the separator element and having an outer circumferential edge and an inner circumferential edge; and wherein the outer circumferential edges of the first and second media disks are connected by the edge seal and the inner circumferential edges of the first and second media disks are connected to the central core.