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Particulate filter structure

  • US 5,662,728 A
  • Filed: 12/31/1992
  • Issued: 09/02/1997
  • Est. Priority Date: 12/31/1992
  • Status: Expired due to Term
First Claim
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1. A particulate filter structure comprising a thermally bonded, three dimensional, fibrous framework comprising composite structural fibers having a denier of at least 30 dpf and comprising a structural component and a first lower melting component, said first lower melting component bonding said fibrous framework together at the cross over points;

  • composite filtration fibers of relatively smaller denier than said structural fibers distributed within and bonded to said fibrous framework and comprising a higher melting component and a second lower melting component, wherein said filtration fibers have a denier of from about 1 to 30 dpf; and

    functional particulate distributed within said fibrous framework and entrapped in interstices formed by said filtration fibers and bonded by said second lower melting component to said filtration fibers;

    wherein said structural fibers comprise up to about 10 percent of the total weight of said particulate filter structure.

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