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Claim 1

A FILTER COMPRISING AN IMPERFORATE CYLINDRICAL CASING CLOSURE MEANS CLOSING BOTH ENDS OF SAID CASING AND PROVIDING INLET AND OUTLET PORTS THERETO, AT LEAST ONE OF SAID MEANS BEING READILY DETACHABLY CONNECTED TO SAID CASING TO PROVIDE ACCESS TO THE INTERIOR THEREOF, AND AN ELONGATED FILTER ELEMENT CARRIED WITHIN SAID CASING BETWEEN SAID CLOSURE MEANS, SAID FILTER ELEMENT BEING SUBSTANTIALLY STARSHAPED IN CROSS SECTION AND COMPRISING A SINGLE SHEET OF FORAMINOUS MATERIA FORMED INTO A SERIES OF RIDGES AND VALLEYS ABOUT A CYLINDRICAL AXIS, A SUPPORT FOR SAID FILTER COMPRISING A PAIR OF LONGITUDINALLY SPACED STAR-SHAPED END MEMBERS HAVING RADIALLY EXTENDING FINGERS, ONE OF SAID END MEMBERS BEING FORMED WITH AN AXIAL OPENING THERETHROUGH, SAID FINGERS OF ONE STAR-SHAPED MEMBER BEING ALIGNED WITH THE FINGERS OF THE OTHER STAR-SHAPED MEMBER, SAID FILTER ELEMENT HAVING OPPOSITE ENDS FIXED TO SAID STARSHAPED MEMBERS, A LONGITUDINALLY EXTENDING STRIP FIXED TO AND CONNECTING EACH PAIR OF ALIGNED FINGERS INWARDLY OF SAID FILTER ELEMENT, THEREBEING A STRIP SUPPORTING EACH RIDGE OF SAID FILTER ELEMENT, SAID STRIPS BEING CORRUGATED WITH THE FOLDS THEREOF EXTENDING IN RADIAL DIRECTIONS, AT LEAST ONE ANNULAR MEMBER BETWEEN SAID STAR-SHAPED MEMBERS AND IN AXIAL ALIGNMENT THEREWITH, AND SAID STRIPS BEING FIXED TO AND SUPPRTED ONN THE PERIPHERY OF SAID ANNULAR MEMBER.