Time-sensitive article tracking device

  • US 6,850,839 B1
  • Filed: 11/21/2002
  • Issued: 02/01/2005
  • Est. Priority Date: 05/08/2000
  • Status: Expired due to Term
First Claim
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1. A method for determining whether an article tracking device is within a spatial zone, the method comprising the steps of:

  • obtaining a current time and a current position of the device;

    determining a spatial zone that corresponds to the current time;

    determining whether the current position of the device is within the spatial zone; and

    sending a request to a server for a subset of server database records in response to the determination of whether the current position of the device is within the spatial zone.

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