Gas recirculating muffler

Claim 1

A MUFFLER FOR AN INTERNAL COMBUSTION ENGINE COMPRISING: MEANS FORMING A CHAMBER AND COMPRISING A STRAIGHT CENTRAL PORTION AND ROUNDED END PORTIONS, A PARTITION EXTENDING TRANSVERSELY ACROSS WITHIN THE STRAIGHT CENTRAL PORTION AND DIVIDING THE LATTER INTO TWO STRAIGHT PASSAGES, THE PARTITION TERMINATING SHORT OF THE ROUNDED END PORTIONS, AN EXHAUST DUCT OPENLY COMMUNICATING WITH THE EXHAUST PORT OF AN INTERNAL COMBUSTION ENGINE AND OPENING LENGTHWISE INTO, AND EXTENDING TRANVERSELY OF, ONE OF THE CHAMBER PASSAGES TO DISCHARGE EXHAUST GASES FROM SUCH ENGINE ALONG THE ONE STRAIGHT PASSAGE TOWARD AND AROUND ONE ROUNDED END PORTION INTO THE OTHER STRAIGHT PASSAGE, BAFFLE MEANS MOUNTED IN THE ONE ROUNDED END PORTION AND POSITIONED TO RETAIN GASES DISCHARGED FROM THE DUCT AGAINST SPREADING WHILE TRAVERSING THE ONE ROUNDED END PORTION, THE CHAMBER FORMING MEANS HAVING A GAP IN THE STRAIGHT CENTRAL PORTION THEREOF COMMUNICATING THE OTHER CHAMBER PASSAGE WITH THE ATMOSPHERE TO PROVIDE AN EXHAUST OPENING IN THE OTHER CHAMBER PASSAGE THROUGH WHICH GASES ARE EXHAUSTED FROM THE CHAMBER, AND BAFFLE MEANS IN THE OTHER ROUNDED END PORTION AND POSITIONED TO DEFLECT GASES PASSING THE EXHAUST OPENING AROUND THE SIDES OF THE DUCT AND THENCE ALONGSIDE THE DUCT AND INTO SAID ONE CHAMBER PASSAGE IN THE DIRECTION TOWARD WHICH THE DUCT IS DIRECTED TO DISCHARGE GASES.