An information storage apparatus is disclosed for storing information on inserted cards the apparatus comprising a sensing means for sensing printed patterns on the surface stored on the card, the patterns arranged in a predetermined number of possible active areas of the card; a decoding means for decoding...http://www.google.co.uk/patents/US6106147?utm_source=gb-gplus-sharePatent US6106147 - Re-writeable optical card reader/writer unit using ink dots for data storage
