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Pre-coalescing multi-layered filter media

  • US 9,149,749 B2
  • Filed: 05/15/2014
  • Issued: 10/06/2015
  • Est. Priority Date: 11/13/2012
  • Status: Active Grant
First Claim
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1. A filter media, comprising:

  • a first layer comprising a first plurality of fibers, wherein the first layer has a first mean flow pore size;

    a second layer comprising a second plurality of fibers having an average fiber diameter of less than or equal to about 2 microns, wherein the second layer has a second mean flow pore size, and wherein a surface of the second layer is modified to be hydrophilic; and

    a third layer comprising a third plurality of fibers, wherein the third layer has a third mean flow pore size,wherein each of the first and third mean flow pore sizes is higher than the second mean flow pore size, andwherein the second layer is positioned between the first and third layers.

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