Refrigerant drier or filter

Claim 1

IN A REFRIGERANT DRIER ASSEMBLY OF THE TYPE HAVING A SLEEVE-LIKE CASING WITH AT LEAST ONE DRIER CARTRIDGE UNIT REMOVABLY MOUNTED THEREIN, WHICH CARTRIDGE UNITS IS OF THE RADIAL FLOW TYPE AND INCLUDES A CYLINDRICAL DRIER ELEMENT WITH AN AXIALLY EXTENDING CENTRAL BORE AND WITH ANNULAR CAP PLATES MOUNTED AT EACH END OF THE DRIER ELEMENT, WHICH CASING HAS A FIRST REFRIGERANT CONNECTION COMMUNICATING WITH THE INTERIOR THEREOF THROUGH A SIDE WALL PORTION OF THE CASING, AND WHICH CASING INCLUDES A SECOND REFRIGERANT FLOW CONNECTION COMMUNICATING WITH THE INTERIOR OF SAID CASING AT ONE END THEREOF, A COVER PLATE AT EACH END OF THE CASING WITH ONE OF THE COVER PLATES AND THE CASING DEFINING A CHAMBER AT ONE END OF THE CARTRIDGE UNIT, WHICH ONE COVER PLATE INCLUDES A CENTRALLY DISPOSED WINDOW IN AXIAL ALIGNMENT WITH THE CENTRAL BORE OF THE DRIER ELEMENT, THE IMPROVEMENT COMPRISING, A RING ASSEMBLY DETACHABLY MOUNTED IN THE CAP PLATE AT SAID ONE END OF THE CARTRIDGE UNIT, WHICH RING ASSEMBLY INCLUDES ANOTHER WINDOW MOUNTED THEREIN, A COIL SPRING COAXIAL WITH SAID CENTRAL BORE, WHICH SPRING HAS OPPOSITE ENDS THEREOF IN RESPECTIVE ENGAGEMENT WITH SAID ONE COVER PLATE AROUND THE WINDOW THEREIN AND WITH SAID RING ASSEMBLY AROUND THE OTHER WINDOW THEREIN, WHEREBY THE SPRING SERVES BOTH TO MAINTAIN THE RING ASSEMBLY ON SAID ONE CAP PLATE AND TO YIELDABLY HOLD THE CARTRIDGE UNIT IN PLACE IN THE CASING.