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Filter medium and breather filter structure

  • US 9,795,906 B2
  • Filed: 12/19/2013
  • Issued: 10/24/2017
  • Est. Priority Date: 11/05/2004
  • Status: Active Grant
First Claim
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1. A nonwoven filtration medium comprising:

  • a loading layer having an average pore size of 5 to 30 micrometers, wherein the loading layer comprises bicomponent fibers and glass fibers, wherein the bicomponent fibers have a concentric sheath-core structure; and

    an efficiency layer having an average pore size of 0.5 to 3 micrometers.

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