A data card is reduced in size from the conventional standard size credit card. Accessibility of the card is enhanced because the card may be stored in a separate location from conventionally sized cards, such as on a key-chain or similar device. The card of the present invention has a means for storing...http://www.google.fr/patents/US20020185543?utm_source=gb-gplus-shareBrevet US20020185543 - Data card
