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  • US 8,551,227 B2
  • Filed: 07/15/2010
  • Issued: 10/08/2013
  • Est. Priority Date: 07/24/2009
  • Status: Expired due to Fees
First Claim
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1. An electrostatic filter comprising:

  • an electrically resistive filter medium located between a first and a second electrode, each at a different voltage during use, such that a potential difference is formed across the filter medium,wherein electrical resistivity of the filter medium varies along a length of the filter medium.

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