A method for automatically filling beverage containers from a pair of adjacent beverage dispensing valves including transmitting ultrasonic energy down from each valve and receiving reflected ultrasonic energy to detect a container, filling the detected container, and operating each valve separated in...http://www.google.com/patents/US4890651?utm_source=gb-gplus-sharePatent US4890651 - Ultrasonic automatic cup filling method operating adjacent valves on different A.C. half cycles
