Sound attenuating gas conduit

Claim 1

IN A SOUND ATTENUATING GAS CONDUIT FOR CONVEYING, AND ATTENUATING THE NOISE LEVEL OF, A MOVING GAS STREAM, AN OPEN-ENDED PIPE FREE FROM SUBSTANTIAL ABRUPT CHANGES IN ITS DIAMETER FORMING A GAS-FLOW PASSAGE HAVING UNRESTRICTED FLOW AT ITS ENDS, AT LEAST ONE SILENCING ELEMENT MOUNTED WITHIN SAID PIPE INWARDLY FROM THE ENDS THEREOF AND COMPRISING AN ELONGATED ENCLOSED WALL FORMING A SOUND ATTENUATING CAVITY, AND THROAT-FORMING MEANS IN DIRECT COMMUNICATION WITH THE INTERIOR OF SAID PIPE OPERATIVELY INTERCONNECTING SAID CAVITY AND GAS-FLOW PASSAGE WHEREBY SAID ELEMENT WILL SILENCE THE GASES MOVING THROUGH SAID PASSAGE, THE CROSS-SECTIONAL AREA OF THE GAS PASSAGE WITHIN THE AXIAL EXTENT OF SAID ELEMENT BEING SMALLER THAN THE AVERAGE CROSS-SECTIONAL AREA OF THE GAS PASSAGE OUTSIDE THE AXIAL EXTENT OF SAID ELEMENT, SAID SILENCING ELEMENT BEING MOUNTED WITHIN SAID PIPE IN SAID GAS-FLOW PASSAGE ON A BRACKET SECURED TO SAID PIPE TO SUPPORT SAID SILENCING ELEMENT WHOLLY OUT OF CONTACT WITH SAID PIPE WHEREBY SAID GAS STREAM MUST PASS THROUGH THE SPACE BETWEEN SAID ELEMENT AND PIPE DURING ITS MOVEMENT THROUGH THE CONDUIT.