Distributing gas to fluidized beds

Claim 1

AN APPARATUS OF THE CHARACTER DESCRIBED INCLUDING A VERTICALLY ARRANGED VESSEL HAVING A ROUNDED BOTTOM, MEANS FOR DISTRIBUTING GASEOUS FLUID INTO THE BOTTOM PORTION OF SAID VESSEL, SAID MEANS INCLUDING A DOUBLE CONE CONSTRUCTION WITH CONCENTIC SPACED CONE ARRANGED IN THE BOTTOM PORTION OF SAID VESSEL AND HAVING THEIR APEXES DOWN, SAID DOUBLE CONE CONSTRUCTION AT ITS LARGEST DIAMETER BEING OF SUBSTANTIALLY THE SAME DIAMETER AS SAID VESSEL, SAID DOUBLE CONE CONSTRUCTION BEING SPACED FROM SAID ROUNDED BOTTOM, A LINE EXTENDING THROUGH SAID ROUNDED BOTTOM AND COMMUNICATING WITH THE BOTTOM PORTION OF SAID DOUBLE CONE CONSTRUCTION FOR INTRODUCTION FLUIDIZING GAS TO THE SPACE BETWEEN SAID CONCENTRIC SPACED CONES, THE LOWER CONE BEING IMPERFORATED, THE UPPER CONE BEING PROVIDED WITH NIPPLES HAVING INSERTED ORIFICE PLATES AND ARRANGED AT DIFFERENT LEVELS TO EFECT SUBSTANTIALLY EQUAL DISTRIBUTION OF GASEOUS FLUID TO THE BOTTOM PORTION OF SAID VESSEL, THE ORIFICE PLATES HAVING LARGER OPENINGS AT THE LOWER LEVELS THAN AT THE HIGHER LEVELS.