Gaseous current separator

Claim 1

IN AN APPARATUS FOR CLASSIFYING GRANULAR MATERIAL INTO CLASSES OF DIFFERENT SIZE RANGES, IN COMBINATION, AN ELONGATED TUBULAR GAS GUIDE HAVING OPPOSITE OPEN ENDS, CLOSED SIDE WALLS, AND TOP AND BOTTOM WALLS, SAID TOP WALL BEING FORMED WITH A PLURALITY OF OPENINGS AT PREDETERMINED POINTS ALONG SAID TOP WALL THROUGH WHICH GRANULAR MATERIAL TO BE CLASSIFIED DROPS INTO THE TUBULAR GAS GUIDE AND SAID BOTTOM WALL BEING FORMED WITH A PLURALITY OF OPENINGS DISTRIBUTED ALONG SAID BOTTOM WALL AND PASSING THERETHROUGH; A PLURALITY OF CONDUIT MEANS COMMUNICATING RESPECTIVELY WITH SAID OPENINGS IN SAID BOTTOM WALL FOR RECEIVING RESPECTIVELY THERETO GRANULAR MATERIAL OF DIFFERENT SIZES; MEANS FOR CREATING A GAS FLOW WITHIN SAID ELONGATED TUBULAR GAS GUIDE IN DIRECTION FROM ONE OF ITS OPEN ENDS TO THE OTHER OF ITS OPEN ENDS; SUPPORT MEANS SUPPORTING SAID TUBULAR GAS GUIDE IN AN INCLINED POSITION WITH SAID ONE OF ITS OPEN ENDS LOCATED AT THE LOWER ELEVATION THAN SAID OTHER OF ITS OPEN ENDS; AND SUPPLY MEANS LOCATED ABOVE THE SAID TOP WALL OF SAID GAS GUIDE ADJACENT SAID OTHER END THEREOF FOR SUPPLYING THROUGH AT LEAST ONE OF THE OPENINGS IN SAID TOP WALL INTO THE TUBULAR GAS GUIDE GRANULAR MATERIAL TO BE CLASSIFIED, SO THAT WHEN A GAS FLOWS UP THROUGH SAID GAS GUIDE FROM SAID ONE TOWARD SAID OTHER OPEN END THEREOF THE GRANULAR MATERIAL DROPPING THROUGH SAID OPENING OF SAID TOP WALL WILL BE DISTRIBUTED BY THE GAS ALONG SAID BOTTOM WALL TO FALL ACCORDING TO PREDETERMINED SIZE RANGES THROUGH SAID OPENINGS OF SAID BOTTOM WALL, RESPECTIVELY.