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Filter system for filtering fluids

  • US 5,639,287 A
  • Filed: 12/15/1995
  • Issued: 06/17/1997
  • Est. Priority Date: 05/16/1994
  • Status: Expired due to Term
First Claim
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1. An air filter system for filtering air streaming into the passenger cabin of a vehicle, comprisinga filter element (10) folded in a wave-shaped or zig-zag-shaped manner having bending lines (14) and substantially plane filter element folding portions (12) arranged therebetween,the wave-shaped filter element (10) formed by a wave-shaped reticular non-filtering support structure (58) having connected thereto a wave-shaped air filter layer (60) of a non-woven material, the air filter layer (60) being arranged behind the reticular support structure (58) when viewed in the flow direction where both the wave-shaped filter layer and the wave-shaped reticular support are formed of thermoplastic material and together define the shape of the wave-shaped filter element, and that the non-woven material of the filter layer (60) is freely expandable to the side facing away from the reticular support structure (58).

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