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Filter bag for a pocket air filter and method for the production thereof

  • US 6,524,359 B1
  • Filed: 08/30/2000
  • Issued: 02/25/2003
  • Est. Priority Date: 01/22/1998
  • Status: Expired due to Term
First Claim
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1. A filter bag comprising first and second side walls formed of air-permeable filter material, the first side wall including two lateral edges welded to respective lateral edges of the second side wall, and a base edge welded to a base edge of the second side wall;

  • the first and second side walls including respective first and second inside surfaces facing one another; and

    a spacer disposed between the first and second side walls for separating the first and second side walls, the spacer defined by a single strip of flexible material which constitutes a separate strip with respect to the first and second side walls, the strip extending from one welded pair of lateral edges to the other welded pair of lateral edges while welded alternately to the inside surfaces of the first and second side walls, wherein the spacer is welded at a plurality of locations to each of the first and second side walls.

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