Glass fiber cartridge filters for drycleaning solvent filtration

Claim 1

A POROUS FILTER TUBE, PARTICULARLY ADAPTED FOR FILTERING DRYCLEANING SOLVENT, COMPRISING (A) AN INNER TUBULAR MEMBER COMPRISING A PLURALITY OF CONVOLUTIONS OF MINERAL FIBER MAT, SAID MAT HAVING A DENSITY OF BETWEEN ABOUT 2 AND ABOUT 10 POUNDS PER CUBIC FOOT, AND SAID FIBER HAVING DIAMETERS BETWEEN 0.00001 AND 0.00040 INCH; SAID FIBERS BEING BONDED AT THEIR INTERSECTIONS WITH BETWEEN 6 AND 30% BY WEIGHT OF SAID FIBERS OF THERMOSETTING RESIN, THE INTERSECTION OF SAID FIBERS DEFINING FILTER PORES HAVING DIAMETERS IN THE RANGE BETWEEN ABOUT 5 AND ABOUT 100 MICRONS, DECREASING IN SIZE IN THE DIRECTION OF THE PROPOSED LIQUID FLOW;