Afterburner and muffler device

Claim 1

A COMBUSTION AFTER BURNER AND MUFFLER DEVICE FOR USE WITH THE EXHAUST PIPE OF AN INTERNAL COMBUSTION ENGINE FOR MODIFYING EXHAUST GASES THEREFROM, COMPRISING: AN ENCLOSED BURNER AND MUFFLER CHAMBER HAVING AN INLET, AN OUTLET AND AN IGNITION MEANS MOUNTED THEREIN; A PLURALITY OF HEAT EXCHANGER CONDUITS FOR DIRECTING EXHAUST GAS FLOW INTO SAID CHAMBER TOWARD SAID IGNITION MEANS IN HEAT EXCHANGE RELATION TO THE INTERIOR OF SAID CHAMBER; FIRST MEANS FOR SUPPLYING EXHAUST GASES TO SAID HEAT EXCHANGER CONDUITS INCLUDING MEANS FOR ADMIXING GAS COMPRISING AIR INTO SAID EXHAUST GASES IN PROPORTION TO THE FLOW RATE OF SAID EXHAUST GASES THROUGH SAID FRIST MEANS; SECOND MEANS FOR SUPPLYING EXHAUST GASES WITHOUT ADMIXING GAS COMPRISING AIR TO SAID HEAT EXCHANGER CONDUITS BYPASSING SAID FIRST MEANS; AND MEANS RESPONSIVE TO THE OPERATING CONDITIONS OF SAID INTERNAL COMBUSTION ENGINE FOR SELECTIVELY DIRECTING EXHAUST GASES TO SAID FIRST AND SECOND MEANS FOR SUPPLYING EXHAUST GASES TO SAID HEAT EXCHANGER CONDUITS SO THAT ALL EXHAUST GASES PASS THROUGH SAID HEAT EXCHANGER CONDUITS BUT THE AMOUNT OF GAS COMPRISING AIR ADMIXED TO THE EXHAUST GASES PASSING THROUGH SAID CONDUITS IS NOT SUBSTANTIALLY INCREASED WHEN THE FLOW RATE OF EXHAUST GASES INTO SAID DEVICE IS INCREASED MORE THAN TWICE THE MINIMUM FLOW RATE WHEN SAID ENGINE IS IDLING.