Refill for filtration coffee-pot

Claim 1

FOR USE IN A COFFEE-MAKING RECEIVER, A REFILL CARTRODGE COMPRISING A SUBSTANTIALLY CYLINDRICAL CLOSED CASE MADE FROM RELATIVELY THIN MATERIAL ADAPTED TO BE SUPPORTED BY A WATER RECEIVER, SAID CASE HAVING PERFORATED TOP AND BOTTOM WALLS, A FLEXIBLE AND DEFORMABLE ADDITIONAL INTERNAL PERFORATED PARTITION PARALLEL TO SAID WALLS OF IN FIXED POSITION RELATIVE TO SAID WALLS, THE THINNESS OF SAID PARTITION BEING SUCH THAT IT BULGES UNDER THE PRESURE OF EXPANDING COFFEE WHEN CONTACTED BY WATER, NEARER TO ONE WALL THAN TO THE OTHER, SO AS TO SUBDIVIDE THE INNER SPACE OF SAID CASE INTO A LARGER CHAMBER AND A SMALLER CHAMBER, A METERED QUANTITY OF GROUND COFFEE IN SAID LARGER CHAMBER COMPLETELY FILLING SAID LARGER CHAMBER, AN INTERNAL SHOULDER ON SAID CASING CONTACTED BY SAID PARTITION, SAID SMALLER CHAMBER BEING COMPLETELY EMPTY AND CONSTITUTING AN EXPANSION CHAMBER PERMITTING THE FREE DEFORMATION OF SAID ADDITIONAL INTERNAL PARTITION AND THE FREE EXPANSION OF THE GROUND COFFEE IN SAID CASE WHEN HEAT AND MOISTURE HAVE BEEN DIRECTED THROUGH SAID REFILL CARTRIDGE.