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Timing system and device and method for making the same

  • US 7,372,780 B1
  • Filed: 06/09/2004
  • Issued: 05/13/2008
  • Est. Priority Date: 12/13/2002
  • Status: Expired due to Fees
First Claim
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1. A timing device comprising an electrochemical structure, the electrochemical structure comprising a solid-state electrolyte and electrodes in electrical communication with the solid-state electrolyte, wherein depletion of one or more of the electrodes provides an indication of a passage of a duration of time, further wherein the electrochemical structure is divided into zones, wherein the zones are made to have different rates of reactivity, that collectively provide a visual indication of the passage of the duration of time.

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