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Automatic payment system using RF ID tags

  • US 7,379,897 B2
  • Filed: 01/26/2005
  • Issued: 05/27/2008
  • Est. Priority Date: 12/21/2000
  • Status: Expired due to Term
First Claim
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1. A method of validating a tag, comprising:

  • (a) resetting a stationary vehicle timer;

    (b) automatically detecting a presence of a vehicle bearing the tag;

    (c) outputting to a point of sale device a tag detection start message and identification information identifying the tag;

    (d) performing a sale in accordance with the identification information, using the point of sale device, and using the tag as a medium of payment;

    (e) receiving tag write data from the point of sale device; and

    (f) writing the tag write data into the tag;

    wherein step (b) comprises determining that the vehicle has been stationary for a period exceeding the stationary vehicle timer and based on the determination outputting to the point of sale device that the presence of the vehicle has been detected.

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