Electrostatic gas filter electrode

Claim 1

AN ELECTRODE FOR AS SPARKLESS CONDENSER FIELD ELECTROSTATIC GAS FILTER COMPRISING A PAIR OF SPACED METAL FORAMINATED MEMBERS LYING IN SUBSTANTIALLY PARALLEL VERTICAL PLANES, INWARDLY TURNED VERTICALLY EXTENDING SIDE WALLS ON EACH MEMBER AT EACH VERTICALLY EXTENDING END THEREOF, VERTICALLY EXTENDING EDGE FLANGES BENT OUTWARDLY OF SAID VERTICALLY EXTENDING SIDE WALLS AND EXTENDING PARALLEL TO SAID MEMBERS, A METAL FRAMEWORK POSITIONED BETWEEN SAID MEMBERS, AND ATTACHMENT PLATE MEANS FASTENING EACH OF SAID FLANGES TO SAID FRAMEWORK AT VERTICALLY SPACED APART POINTS ON SAID MEMBERS, SAID MEMBERS FORMING A SUBSTANTIALLY RECTANGULAR BOX, AND ADJUSTING MEANS ADJUSTING SAID ATTACHMENT PLATE MEANS TO A POSITION PERMITTING SAID FLANGES TO SLIDE ON SAID FRAMEWORK DURING THERMAL EXPANSION OF SAID MEMBERS WITHOUT WARPING OF THE ELECTRODE WHILE MAINTAINING FRICTIONAL ENGAGEMENT BETWEEN SAID FRAMEWORK AND SAID FLANGES THEREBY MAINTAINING SAID MEMBERS IN A POSITION FORMING SAID SUBSTANTIALLY RECTANGULAR BOX.