Patent ID: 8480217

Claim:
An ink jet cartridge comprising an ink container which comprises: a bottom portion and an upper portion, said bottom portion being in communication with a printhead through an ink supply port, and said upper portion being in communication with a vent hole, said bottom portion comprising a first ink absorbing member having a first surface plane, and said upper portion comprising a second ink absorbing member having a second surface plane, wherein said first ink absorbing member is a compressible porous material and said second ink absorbing member is an incompressible porous material, wherein the capillarity of said first ink absorbing member is higher than the capillarity of said second ink absorbing member, wherein the first surface plane and the second surface plane are contacted along a contact plane through which the bottom portion and the upper portion are contacted to form the ink container, and wherein said upper portion comprises on its internal sides a plurality of ribs extending in the internal sides of said upper portion down to the contact plane between the bottom portion and the upper portion to form spaced portions between the internal sides of said upper portion and said second ink absorbing member allowing passage of air from said vent hole to the first ink absorbing member.