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Production of radio frequency ID tags

  • US 20060276987A1
  • Filed: 06/03/2005
  • Published: 12/07/2006
  • Est. Priority Date: 06/03/2005
  • Status: Active Grant
First Claim
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1. In the production of a radio frequency ID tag, of the type that receives and stores RF energy from an interrogator and uses that energy for the transmission of a responding signal, a method for imposing a randomized transmit time delay on each tag manufactured, such time delay being different for essentially every tag to avoid simultaneous responsive transmission by multiple tags, comprising:

  • including a non-volatile settable element in an integrated circuit of the tag, with a computer in the manufacturing process, generating a pseudo-random number using an algorithm, such pseudo-random number essentially being different for each tag in a batch of tags for a particular application, and placing such a pseudo-random number in the non-volatile element of each such tag, such number controlling the transmit time delay for responding transmission of each tag, whereby no random number generator is needed onboard the tag.

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