Method of cleaning filter media

Claim 1

IN A METHOD OF MANIPULATING PULSES OF HIGH ENERGY GAS TO EFFECT IMPROVEMENT IN PERMEABILITY OF NON-RIGID FILTER MEDIA IN DUST COLLECTION SYSTEMS WHEREIN DURING SAID DUST COLLECTION THE GAS FROM WHICH THE DUST IS COLLECTED MOVES IN A NORMAL FILTERING FLOW THROUGH A SYSTEM DEFINED PATH WHICH INCLUDES ENTRY INTO AND EXIT FROM A NONRIGID FILTER MEDIUM WHICH RETAINS ON ITS UPSTREAM SIDE AT LEAST A PORTION OF THE COLLECTED DUST, THE IMPROVEMENT OF RELEASING OVER A CROSS-SECTIONAL AREA OF SOME PART OF THE PATH TAKEN BY A NORMAL FILTERING FLOW OF GAS AND IN A DIRECTION GENERALLY OPPOSITE THE DIRECTION TAKEN BY SUCH A NORMAL FLOW AT LEAST TWO SERIES OF GAS PULSES EACH SAID SERIES OF SAID PULSES BEING SEPARATED FROM THE PRECEDING SERIES BY A TIME INTERVAL OF AT LEAST GREATER LENGTH THAN THE TIME OF OPERATION OF THE PRECEDING SERIES EACH SAID SERIES BEING COMPOSED OF AT LEAST TWO PULSES AND BEING FURTHER CHARACTERIZED BY THE FACT THAT A SUCCEEDING PULSE IS RELEASED BEFORE THE GAS MOVEMENT EFFECT OF A PRECEDING PULSE HAS BEEN DISSIPATED SO THAT DURING SAID SERIES AND UNTIL THE EFFECT OF THE LAST PULSE OF SAID SERIES HAS BEEN DISSIPATED THE CONDITION AS TO GAS MOVEMENT IN SAID SYSTEM IS DIFFERENT FROM THE CONDITION IMMEDIATELY PRECEDING THE INITIATION OF SAID SERIES THE ENERGY OF EACH PULSE OF EACH SERIES BEING SUCH AS TO CAUSE A MOMENTARY FLOW OF GAS IN SAID SYSTEM IN A DIRECTION OPPOSITE THE NORMAL FLOW OF GAS THROUGH SAID PATH.