Exhaust systems for gas producing units

Claim 1

A GAS PRODUCING UNIT COMPRISING AT LEAST ONE COMBUSTION CHAMBER HAVING AT LEAST ONE CONTROLLED EXHAUST ORIFICE THAT OPENS AND CLOSES AT PREDETERMINED POINTS IN THE CYCLE OF OPERATIONS OF THE SAID UNIT AND FROM WHICH THE GASEOUS PRODUCTS OF COMBUSTION ARE DISCHARGED PERIODICALLY AT HIGH TEMPERATURE AND UNDER PRESSURE, THUS PRODUCING SUCCESSIVE PULSES OF AT LEAST ONE EXHAUST ORIFICE, AND AN EXHAUST SYSTEM, INCLUDING A JUNCTION, A FIRST DUCT MADE TO THE PRACTICAL LIMIT OF SHORTNESS LEADING FROM SAID AT LEAST ONE EXHAUST ORIFICE TO SAID JUNCTION, WHERE EACH PULSE OF GASES ORIGINATING AT LEAST ONE EXHAUST ORIFICE IS DIVIDED INTO PRIMARY AND SECONDARYF PARTIAL PULSES, A SECOND DUCT MADE TO THE PRACTICAL LIMIT OF SHORTNESS TO PROVIDE A DIRECT PASSAGEWAY FROM SAID JUNCTION TO SAID DRIVEN MACHINE, THROUGH WHICH THE PRIMARY PARTIAL PULSES PASS DIRECTLY TO THE MACHINE WHEREBY TO DRIVE THE MACHINE BY THEIR EXPANSION, AND AT LEAST ONE WAVE PIPE CLOSED AT THE END REMOTE FROM SAID JUNCTION AND CONNECTED TO SAID JUNCTION TO PROVIDE AN INDIRECT PASSAGE WAY TO THE MACHINE FOR SAID SECONDARY PARTIAL PULSES, THE INDIRECT PASSAGE WAY FOR SAID SECONDARY PARTIAL PULSES BEING SO MUCH LONGER THAN THE DIRECT PASSAGE WAY FOR SAID PRIMARY PARTIAL PULSES THAT EACH SAID SECONDARY PARTIAL PULSE REACHES SAID MACHINE TO AID IN ITS OEPRATION AFTER EACH ASSOCIATED PRIMARY PARTIAL PULSE OF GASES, WHICH TRAVELLED DIRECTLY ALONG SAID SECOND DUCT, HAS SUBSTANTIALLY COMPLETED THE EXPANSION OF ITS GASES IN DRIVING THE MACHINE.