Electrostatic air filter

Claim 1

AN ACCORDION PLEATED DIELECTRIC FILTER MEDIUM HAVING AN ARRANGEMENT OF CONDUCTIVE STRIPES DISPOSED THEREON FOR DISTRIBUTING AN ELECTROSTATIC CHARGE THEREOVER, COMPRISING: (A) A SERIES OF ALTERNATE AND INTERMEDIATE STRIPES ADAPTED FOR CONNECTION TO RESPECTIVELY DIFFERENT ELECTRICAL POTENTIALS ON EACH HALF PLEAT, THE STRIPES ON EACH HALF PLEAT BEING SUBSTANTIALLY EQUALLY SPACED AND DISPOSED PARALLEL TO THE PLEATING LINES OF SAID MEDIUM, ALL HALF PLEATS FACING IN ONE DIRECTION HAVING THEIR FIRST STRIPES CLOSELY ADJACENT BUT NOT ON CRESTS AND THEIR LAST STRIPES SPACED A SUBSTANTIAL DISTANCE FROM TROUGHS, AND ALL HALF PLEATS FACING IN THE GENERALLY OPPOSITE DIRECTION HAVING THEIR FIRST STRIPES CLOSELY ADJACENT BUT NOT IN TROUGHS AND THEIR LAST STRIPES SPACED A SUBSTANTIAL DISTANCE FROM CRESTS, (B) THE LAST STRIPE OF SAID SERIES ON EACH HALF PLEAT WHICH FACES ONE WAY, AND THE FIRST STRIPE OF SAID SERIES ON EACH ADJACENT HALF PLEAT WHICH FACES THE GENERALLY OPPOSITE WAY BEING SPACED APART A SUFFICIENTLY GREATER DISTANCE, AS MEASURED ALONG THE CONTOUR OF THE MEDIUM, THAN THE DISTANCE BETWEEN ADJACENT STRIPES IN ANY ONE SERIES THAT, IN PLEATED FORM, THE STRAIGHT LINE DISTANCE BETWEEN THE SAID LAST STRIPE ON ONE HALF PLEAT AND THE SAID FIRST STRIPE ON THE NEXT ADJACENT HALF PLEAT IS NOT SUBSTANTIALLY LESS THAN THE DISTANCE BETWEEN ADJACENT STRIPES IN ANY ONE SERIES, (C) SAID FILTER MEDIUM BEING DEVOID OF ANY OF SAID STRIPES LYING ON CREST FOLD LINES AND LYING IN TROUGH FOLD LINES FORMED BETWEEN SAID HALF PLEATS.