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Method of making a gas permeable material

  • US 5,925,406 A
  • Filed: 07/18/1997
  • Issued: 07/20/1999
  • Est. Priority Date: 07/18/1997
  • Status: Expired due to Term
First Claim
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1. A method of making a gas permeable material having a diffusive gas permeability at 0.21 atmosphere diffusive driving force ranging from about 0.5×

  • 105 cm3 /100 square inches/day to about 2×

    105 cm3 /100 square inches/day, said method comprising the steps of;

    a) coating a pattern of spots of a gas impermeable material onto a porous substrate; and

    b) enlarging said pattern of spots to cover greater than about 95% of said porous substrate such that said gas permeability occurs only through openings between said pattern of spots.

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