Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
John Frederick Porter0
Date of Patent
December 12, 2006
0Patent Application Number
108432570
Date Filed
May 11, 2004
0Patent Citations Received
Patent Primary Examiner
Patent abstract
The present invention relates to a composite sheet material that is water vapor permeable and substantially liquid water impermeable. The composite sheet material includes an outer layer, a film, and a reinforcing layer and, preferably, has an ASTM D3833 water vapor transmission rate of greater than 250 g/m2/day, and a tensile strength of at least about 100 N/5 cm when tested in accordance with ASTM D5035. The sheet material is useful as a membrane for roofing, housewrap, insulation facing and in the fabrication of protective apparel.
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