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Monitoring entry through doorways

  • US 20020121961A1
  • Filed: 04/03/2002
  • Published: 09/05/2002
  • Est. Priority Date: 04/01/2000
  • Status: Abandoned Application
First Claim
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1. An apparatus for detecting and providing indication of ‘

  • tailgating’

    through an access controlled portal, comprising means for transmitting and receiving one or more infrared beams across the portal, monitored by an electronic control means electronically disposed between an authorising means and a locking and/or unlocking means associated with the portal.

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