Muffler construction

Claim 1

CATALYTIC MUFFLER CONSTRUCTION FOR EXHAUST GASES COMPRISING, UPPER AND LOWER FORAMINOUS GRIDS HAVING SPACED LONGITUDINAL SLOTS AND FORMING AN ELONGATED FLATTENED BED STRUCTURE FOR ENCLOSING CATALYST MATERIAL, A ONE-PIECE BODY SHELL SURROUNDING SAID UPPER AND LOWER GRIDS AND HAVING PERIPHERAL FLANGES AT EITHER END, LONGITUDINAL INWARD EMBOSSMENTS FORMED IN SAID BODY SHELL EXTERIORLY OF SAID GRIDS, A LONGITUDINAL PERFORATED CENTER BEAM BETWEEN SAID GRIDS, A LONGITUDINAL PERFORATED CENTER BEAM BETWEEN SAID GRIDS EXTENDING A PORTION OF THE LENGTH THEREOF, SPACED PROJECTIONS ON THE EDGES OF SAID LONGITUDINAL PERFORATE BEAM EXTENDING THROUGH SAID SPACED SLOTS IN SAID GRIDS AND ATTACHED TO SAID LONGITUDINAL INWARD EMBOSSMENTS OF SAID BODY SHELL, BEARING STRIPS INBTERPOSED BETWEEN SAID LONGITUDINAL CENTER BEAM AND THE INNER SURFACES OF SAID GRIDS, WHEREBY SAID GRIDS ARE MOVABLY SUPPORTED AND THE CATALYTIC MATERIAL IS RESTRICTED FROM ESCAPING INTO THE SLOTS OF SAID GRIDS, END SHELLS HAVING PERIPHERAL FLANGES MATING WITH AND ATTACHED TO THE PERIPHERAL FLANGES MATING WITH AND ATTACHED TO THE PERIPHERAL FLANGES ON SAID BODY SHELL AND PROVIDING TAPERED FLOW TRANSITIONS, AND MEANS ON THE INTERIOR OF SAID BODY SHELL AND END SHELLS SEALING THE PERIPHERY OF SAID GRIDS AGAINST THE ESCAPE OF CATALYST MATERIAL.