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Porous membrane

  • US 7,686,132 B2
  • Filed: 12/29/2005
  • Issued: 03/30/2010
  • Est. Priority Date: 12/29/2005
  • Status: Active Grant
First Claim
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1. An acoustic insulating sheet material comprising in laminar assembly a) a primary sound absorbing sheet, and b) a dense, porous self-sustaining membrane about 200 micrometers or less in thickness that i) has an airflow resistance of about 10,000 rayls or less and ii) has an Acoustic Value Ratio of at least 3000.

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