Oil filter cartridges

Claim 1

AN OIL FILTER ELEMENT OR CARTRIDGE EMPLOYING CHEMICALLY TREATED, SHORT-LENGTH VEGETABLE FIBERS AS THE FILTERING MEDIA COMPRISING: A PERFORATED, RIGID CAN-BODY TYPE CONTAINER, A PERFORATED RIGID CENTER TUBE COAXIAL THEREWITH, END CAPS EACH HAVING A CENTER OPENING OF DIAMETER CORRESPONDING GENERALLY TO THAT OF THE CENTER TUBE AND BEING SEAMED ALONG THEIR OUTER PERIPHERIES TO THE END EDGES OF THE CONTAINER BODY, A DENSELY COMPACTED MASS OF SAID VEGETABLE FIBERS CONTAINED IN THE FILLING THE ANNULAR SPACE BETWEEN THE CENTER TUBE AND CONTAINER BODY, AND MEANS FOR SECURING THE END CAPS ALONG THEIR RESPECTIVE CENTER OPENINGS TO THE ENDS OF THE CENTER TUBE AND IN MANNER AS POSITIVELY TO PREVENT MIGRATION OF SAID VEGETABLE FIBERS FROM THE INTERIOR OF THE CONTAINER BODY OVER THE CENTERTUBE ENDS AND THENCE OUTWARDLY THROUGH THE CENTER TUBE, SAID MEANS COMPRISING CYLINDRICAL FERRULES AFFIXED TO THE CENTER TUBE ENDS EXTERNALLY THEREOF AND HAVING RADIALLY INWARD FLANGES EXTENDING OVER AND BEARING ON THE TUBE ENDS AND DEFINING FLAT, ANNULAR SEATING SURFACES WHICH TERMINATE INWARDLY IN CYLINDRICAL FLANGES WHICH PROJECT AXIALLY INTO THE BORE OF THE CENTER TUBE, AND RETAINING BUSHINGS HAVING CYLINDRICAL BODIES EXTENDING INTO AND DIMENSIONED SO AS TO HAVE FORCE FIT IN THE OPEIINGS OF SAID FERRULES DEFINED BY THEIR CYLINDRICAL FLANGES AND BEING PROVIDED ON THEIR RELATIVELY AXIALLY-OUTER ENDS WITH RADIALLY OUTWARD FLANGES WHICH BEAR ON AND CLAMP THE ENDS CAPS ALONG THE EDGES OF THEIR CENTER OPENINGS AGAINST THE ANNULAR SEATING SURFACES DEFINED BY THE RADIALLY INWARD FLANGES OF SAID FERRULES AS AFORESAID.