A conditional e-coupon distribution method distributes e-coupons predefined by sellers to mobile users only if the number of mobile users requesting such e-coupons equals or exceeds a threshold. The method receives a request to browse e-coupons from a mobile user. The method receives the location of...http://www.google.com.tw/patents/US20030093314?utm_source=gb-gplus-share專利 US20030093314 - Conditional e-coupon service for location-aware mobile commerce
