US Patent 7427121 Pagewidth printhead cartridge having multiple ink storage capacity

A cartridge unit for an inkjet printer comprising:a body portion having a plurality of ink storage compartments; anda pagewidth printhead assembly configured to receive ink from ink storage compartments and distribute said ink to a plurality of nozzles arranged in use to deliver the ink onto passing print media;wherein the ink storage compartments comprise an absorption material which stores the ink therein under capillary action for supply to the nozzles of the printhead assembly.