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Electronic travel pass

  • US 5,734,722 A
  • Filed: 07/13/1994
  • Issued: 03/31/1998
  • Est. Priority Date: 07/17/1991
  • Status: Expired due to Fees
First Claim
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1. Apparatus for transferring data from one device to another, comprising:

  • a portable device,a device that is relatively stationary as compared to said portable device, anddata transfer means for transferring data from said stationary device to said portable device, and from said portable device to said stationary device, comprising means for transmitting data in binary form via said data transfer means from either one of said devices to the other of said devices, by producing a series of pulses and at predetermined times during said series providing, or not providing, a pulse,each said device having a counter for determining said predetermined times, andmeans responsive to at least one pulse of said series for synchronizing the counters.

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