Data in memory means of an ink cartridge can be read, written and rewritten by a recording apparatus. When abnormality has occurred in the recording apparatus, the information can be notified to a user or the like based on the data stored in the memory means of the ink cartridge. Further, control means...http://www.google.com.au/patents/US6431680?utm_source=gb-gplus-sharePatent US6431680 - Ink cartridge and recording apparatus
