Electrostatic filter

Claim 1

A filter, comprising: (a) a first planar electrode made of a very thin sheet of resinous material with a much thinner layer of conductor deposited thereon and having a length much longer than its width and having planar surfaces and positioned, curvedly configured and dimensioned in such a manner that portions of a planar surface of said first planar electrode face other portions of its planar surfaces; (b) a second planar electrode made of a very thin sheet of resinous material with a much thinner layer of conductor deposited thereon and having a length much longer than its width and having planar surfaces positioned, curvedly configured and dimensioned to be supported between said facing portions of said planar surfaces of said first planar electrode with portions of its planar surfaces in facing relationship to facing portions of said first planar electrode to define a plurality of paths parallel to the width of said first and second planar electrodes; and (c) spacer means secured to said first planar electrode to make portions of said first planar electrode substantially rigid with respect to other portions of said first planar electrode and for substantially rigidly securing points on said second planar electrode to said first planar electrode said spacer means comprising a pair of resilient insulative ribbons having a width much less than the width of said planar electrodes which have been corrugated and which are adhered to said first and second planar electrodes.