Filter construction

Claim 1

A FILTER CONSTRUCTION ADAPTED FOR REMOVING BOTH SOLID AND LIQUID PHASE CONTAMINANTS FROM A FLOW OF FLUID MATERIAL WHICH IS PASSED THROUGH THE FILTER AND WHEREIN FILTERING ACTION IS INCREASED AS THE FLUID PROGRESSES THROUGH SUCH FILTER, SAID CONSTRUCTION COMPRISING A PLURALITY OF FILTERING LAYERS OF A GENERALLY INCREASING FILTERING ABILITY AND INCLUDING A CYLINDRICAL INNER CHAMBER FOR RECEIVING AN INLET FLOW OF THE MATERIAL FOR FILTRATION, AN INITIAL FILTERING LAYER COMPRISED OF FIBERS WHICH ARE DISPOSED RADIALLY TO BE IN GENERAL ALIGNMENT WITH THE RADIAL FLOW OF FLUID UNDERGOING FILTRATION TO MINIMIZE OBSTRUCTING EFFECT ON THE PASSAGE OF FLUID PASSING THERETHROUGH, AT LEAST ONE ADDITIONAL LAYER OF FILTER MATERIAL ALSO HAVING FIBERS DISPOSED IN A RADIAL DIRECTION TO BE SUBSTANTIALLY PARALLEL WITH THE DIRECTION OF FLOW OF FLUID AND OF A GREATER DENSITY THAN SAID INITIAL LAYER TO EFFECT AN INCREASED FILTERING ACTION, A LAYER OF FIBER MATERIAL WHICH IS WOUND OVER SAID ADDITIONAL LAYER OF RADIALLY DISPOSED FIBERS AND HAVING THE FIBERS ORIENTED TRANSVERSELY TO THE DIRECTION OF FLOW OF THE FLUID PASSING THROUGH THE FILTER TO INCREASE THE FILTERING ACTION OVER THAT OF SAID RADIALLY DISPOSED FIBERS, MEANS FOR RETAINING SAID RESPECTIVE LAYERS OF FILTER MATERIAL IN THEIR PRESELECTED RADIAL AND NONRADIAL POSITIONS AS THE FLUID IS PASSED UNDER PRESSURE FROM THE INTERIOR OF THE FILTER RADIALLY OUTWARDLY TO THE EXTERIOR OF THE FILTER THROUGH A SUCCESSION OF FILTER LAYERS WHICH GENERALLY INCREASE IN THEIR RESPECTIVE FILTERING ACTIONS, AT LEAST ONE SCREEN LAYER SURROUNDING SAID FILTER TO PROVIDE CIRCUMFERENTIAL REENFORCEMENT, AND END CAPS DISPOSED ONE AT EACH END OF SAID FILTER TO DIRECT THE PASSAGE OF FLUID TO A PRESCRIBED RADIALLY OUTWARD DIRECTION THROUGH THE FILTERING LAYERS OF SUCCESSIVELY INCREASING FILTERING ABILITY.