A timing device for indicating the passage of a duration of time is disclosed. The timing device and system, in accordance with the embodiments of the invention, comprise an electrochemical component which generates a visual and/or audio indication of the passage of time. The timing device further comprises...http://www.google.com/patents/US7254095?utm_source=gb-gplus-sharePatent US7254095 - Timing system and device and method for making the same
