An electronic card includes a digital processor, an electrochemical battery and a communications port. The processor and battery are essentially coplanar, and are sandwiched between and enclosed by two flexible covers, preferably made from an insulating plastic material, and preferably fitted to the...http://www.google.com.hk/patents/US20070034700?utm_source=gb-gplus-share專利 US20070034700 - Electronic cards and methods for making same
