An ink cartridge has a cartridge body to which an ink supply pipe extending from an inkjet printer is detachably attached, and which has an ink storing space for storing an ink to be supplied to the inkjet printer via the ink supply pipe, and a valve mechanism that opens and closes both an ink path which,...http://www.google.com.au/patents/US7328987?utm_source=gb-gplus-sharePatent US7328987 - Ink cartridge and inkjet printer
