Electrostatic adsorptive fluid filtering apparatus

Claim 1

An electrostatic adsorptive fluid filtering apparatus, comprising: an outer cylindrical electrode having a fluid inlet; a charging electrode concentrically inserted in said outer cylindrical electrode, said charging electrode comprising a porous electric conductor formed in a double walled cylinder including concentric inner and outer walls defining a space therebetween and a hollow interior inside said inner wall, said outer cylindrical electrode and said charging electrode defining together a fluid receiving space communicating with said fluid inlet; an adsorbent situated in an filling said space between the inner and outer walls of the double walled cylinder; a central electrode axially extending within said hollow interior of said charging electrode, said central electrode comprising a pipe piece and defining a fluid outlet; and a source of electrical voltage connected to said outer cylindrical electrode, the charging electrode and the central electrode, wherein a voltage is impressed across said outer cylindrical electrode and said charging electrode, on one side, with the voltage on said central electrode and said outer cylindrical electrode being at the same potential and different from the potential on said charging electrode, while fluid under pressure is introduced through said inlet into said fluid receiving space, and passes through the charging electrode, the adsorbent and the central electrode to said fluid outlet.