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Wireless system for sensing information at remote locations and communicating with a main monitoring center

  • US 5,568,121 A
  • Filed: 05/27/1993
  • Issued: 10/22/1996
  • Est. Priority Date: 05/27/1993
  • Status: Expired due to Term
First Claim
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1. A system for sensing information at remote, potentially hazardous, locations and transmitting sensed information to a central location which comprises:

  • a main monitoring center including radio means for transmitting signals to, and receiving signals from, at least one remote portable electronic attendant;

    at least one remote portable attendant including radio means for receiving information containing signals from, and transmitting information containing signals to, said main monitoring center;

    means at said remote portable attendant independent of said main monitoring center for periodically producing an audible and/or visual warning at said remote portable attendant on a selected schedule independent from any other remote portable attendant on the system;

    manual acknowledgement means at said remote portable attendant for sending an acknowledgement signal to said main monitoring center; and

    automatic means for generating an alarm signal at a remote portable attendant and for sending an alarm signal to said main monitoring center if acknowledgement is not completed within a selected period.

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