Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Sam A. Hopkins0
Donald G. Wells0
Date of Patent
March 3, 2009
Patent Application Number
11509180
Date Filed
August 23, 2006
Patent Primary Examiner
Patent abstract
A particle control screen includes a support layer. A first filter layer is disposed around the support layer. A second filter layer is disposed around the first filter layer. A third filter layer is disposed around the second filter layer. Each of the filter layers has a pore size. The pore size of the third filter layer is greater than the pore size of the second filter layer. The pore size of the second filter layer is greater than the pore size of the first filter layer.
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