Filter having corrugated nonwoven webs of polymeric microfiber

Abstract

A filter that is capable of removing particulate and gaseous contaminants from a fluid, which filter comprises: a first filter element that is capable of removing particulate contaminants from a fluid, the first filter element comprising a corrugated nonwoven web of polymeric microfiber having a solidity of 0.1 or less and a means for retaining the corrugated shape of the corrugated nonwoven web of polymeric microfiber, the shape-retaining means being secured to the corrugated nonwoven web to maintain the corrugated shape of the corrugated nonwoven web of polymeric microfiber, and a second filter element comprising a sorbent material capable of removing gaseous contaminants from a fluid; the first and second filter elements being secured to each other and having a shape adapted for attachment to a respirator.

Dependencies are inferred from the claim text.