An electronic couponing technique includes transferring coupon information, which may include a coupon ID (identification) to a first portable terminal and storing same therein. The portable terminal displays a representation of the transferred coupon information on a display thereof. The stored coupon...http://www.google.com.hk/patents/US8090355?utm_source=gb-gplus-share專利 US8090355 - Wireless electronic couponing technique
