Vacuum cleaner filter bag

Claim 1

A VACUUM CLEANER FILTER BAG COMPRISING IN COMBINATION A RECEPTACLE AD A CONNECTING TUBE, SAID RECEPTACLE BEING FORMED OF A SINGLE SHEET OF POROUS PAPER FOLDED SUBSTANTIALLY IN HALF ALONG A FOLD LINE AND ADHESIVELY JOINED ALONG MATING ABUTTING EDGES IN FACE-TO-FACE RELATIONSHIP EXTENDING FROM SAID FOLD LINE TO DEFINE A RECEPTACLE STRUCTURE HAVING A TOP DEFINED BY A PAIR OF JUXTAPOSED EDGES OF SAID SHEET OPPOSITE SAID FOLD LINE, A PAIR OF FACE WALLS HAVING SIDES SAID SIDES BEING DEFINED BY SAID JOINED EDGES AND A SEAMLESS BOTTOM DEFINED BY SAID FOLD LINE, SAID RECEPTACLE COMPRISING A PLURALITY OF KNIFE PLEATS ADJACENT EACH OF SAID SIDES, EACH OF SAID KNIFE PLEATS EXTENDING DOWN ONE FACE WALL OF SAID RECEPTACLE, UNDER SAID BOTTOM, AND UP THE OPPOSED FACE WALL OF SAID RECEPTACLE, ONE OF SAID FACE WALLS BEING PERFORATED TO DEFINE AN APERTURE THEREIN; SAID CONNECTING TUBE BEING AN ELONGATED PAPER TUBE HAVING AN OPEN LOWER END ADAPTED TO EMBRACE A VACUUM CLEANER DISCHARGE FITTING AND AN UPPER END ADJACENT THE TOP OF SAID RECEPTACLE, SAID CONNECTING TUBE BEING PERFORATED TO DEFINE AN APERTURE REGISTERING WITH SAID RECEPTCLE APERTURE, SAID CONNECTING TUBE BEING JOINED TO SAID RECEPTACLE BY A LAYER OF ADHESIVE INTERPOSED BETWEEN SAID CONNECTING TUBE AND SAID RECEPTACLE AND SURROUNDING SAID REGISTERED APERTURES, THE UPPER END OF SAID TUBE AND THE TOP OF SAID RECEPTACLE BEING FOLDED TOGETHER ALONG AT LEAST TWO FOLD LINES GENERALLY PARALLEL WITH THE TOP OF SAID RECEPTACLE FORMING AT LEAST A DOUBLE FOLD AND HELD IN SAID DOUBLE-FOLDED CONFIGUARTION.