Filter

Claim 1

A MULTIPLE STAGE FLUID FILTER COMPRISING: A. A FILTER HOUSING HAVING AN INLET PORT FOR ADMITTING FLUID TO BE TREATED INTO THE HOUSING; B. A PLURALITY OF FILTER STAGES WITHIN THE HOUSING AND THROUGH WHICH THE FLUID IS ADAPTED TO PASS UNDER PRESSURE, EACH FILTER STAGE COMPRISING A CHAMBER CONTAINING A. AN INLET CHANNEL, B. A TUBULAR COIL HAVING A FUNNEL-SHAPED INLET IN COMMUNICATION WITH THE INLET CHANNEL AND HAVING OPENINGS THROUGH WHICH THE FLUID IS ADAPTED TO PASSS UPWARDLY IN TJHE CHAMBER, C. A PLURALITY OF LAYERS OF POROUS FILTERING MEDIA SEPARATED BY SCREENS LOCATED IN THE CHAMBER ABOVE AND SPACED FROM THE COIL, D. A BODY OF CLEANING LIQUID FILLING THE CHAMBER TO A LIQUID LEVEL ABOVE THE UPPERMOST OF THE LAYERS OF POROUS FILTERING MEDIA, E. A PLURALITY OF BAFFLES AT THE TOP OF THE CHAMBER ABOVE THE POROUS FILTERING MEDIA AND EXTENDING AT LEAST PARTIALLY INTO SAID CLEANING LIQUID FOR STABILIZING THE LIQUID LEVEL DURING VIBRATION OF THE FILTER HOUSING; AND C. AN OUTLET PORT IN THE HOUSING IN COMMUNICATION WITH THE CHAMBER OF THE LAST OF THE FILTER STAGES THROUGH WHICH THE FLUID TO BE TREATED PASSES, THE INLET CHANNEL OF AT LEAST ONE STAGE BEING CONNECTED TO THE INLET PORT OF THE HOUSING AND THE BALANCE OF THE STAGES BEING CONNECTED TO AN ADJACENT FILTER STAGE CHAMBER, WHEREBY FLUID TO BE TREATED CAN ENTER THE INLET PORT OF THE HOUSING; PASS INTO THE INLET CHANNEL OF A FIRST STAGE; PASS INTO THE INLET OF A TUBULAR COIL THEREIN; PASS THROUGH THE TUBULAR COIL AND UPWARD THROUGH THE CLEANING LIQUID AND THE POROUS FILTERING MEDIA AND INTO THE INLET CHANNEL OF THE NEXT SUCCEEDING STAGE; AND THEN PASS THROUGH SUCCESSIVE STAGES TO THE OUTLET PORT OF THE FILTER HOUSING WHERE IT IS EXHAUST FROM THE FILTER.