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Hepa filter

  • US 6,428,610 B1
  • Filed: 01/18/2000
  • Issued: 08/06/2002
  • Est. Priority Date: 01/18/2000
  • Status: Expired due to Fees
First Claim
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1. A particulate air filter media comprising:

  • a. a first pile of charged nonwoven fabric having a weight in the range of 5-40 grams per square meter and one or more fibers having a diameter in the range of 1.5-2.0 microns;

    b. a second pile of nonwoven fabric having a weight in the range of 5-40 grams per square meter and one or more fibers having a diameter in the range of 1.5-2.0 microns, adjacent to said first pile;

    c. a third pile of nonwoven fabric having a weight in the range of 5-40 grams per square meter and one or more fibers having a diameter in the range of 1.5-2.0 microns, adjacent to said second pile; and

    d. a stiffening layer bonded to one of said piles.

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