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System and method for monitoring environmental conditions

  • US 7,461,973 B2
  • Filed: 12/23/2005
  • Issued: 12/09/2008
  • Est. Priority Date: 12/24/2004
  • Status: Active Grant
First Claim
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1. A system for monitoring environmental conditions of a perishable product, the system comprising:

  • an environmental sensor configured to sense one or more environmental conditions of the perishable product;

    an analog integrator in communication with the environmental sensor, the analog integrator being formed on a polymer substrate and including one or more tunable components;

    a comparator in communication with the analog integrator and configured to change state when an output of the analog integrator reaches a selected threshold level; and

    a control module in communication with the comparator and the analog integrator,wherein the control module is configured to;

    control the operation of the analog integrator based on an output of the comparator; and

    tally a count of a number of threshold events reached, the number of threshold events capable of including more than one.

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