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Apparatus for detecting and indicating alarm conditions in a protected area

  • US 3,209,342 A
  • Filed: 05/23/1960
  • Issued: 09/28/1965
  • Est. Priority Date: 05/23/1960
  • Status: Expired due to Term
First Claim
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11. A SECURITY SYSTEM HAVING A CEN TRAL STATION AND AT LEAST ONE REMOTE STATION, SAID REMOTE STATION HAVING A PLURALITY OF DETECTOR ELEMENTS EACH ACTUABLE IN RESPONSE TO A DIFFERENT ALARM CONDITION, SAID DETECTOR ELEMENTS BEING DIVIDED INTO AT LEAST ONE PAIR OF GROUPS, EACH GROUP INCLUDING A PLURALITY OF DETECTOR ELEMENTS, FIRST MEANS ASSOCIATED WITH SAID REMOTE STATION FOR PRODUCING A PLURALITY OF DIFFERENT FIRST SIGNALS, ONE OF SAID SIGNALS BEING INDICATIVE OF SAID PAIR OF GROUPS, SECOND MEANS ASSOCIATED WITH EACH REMOTE STATION FOR PRODUCING A PAIR OF DIFFERENT SECOND SIGNALS EACH ALSO DIFFERING FROM EACH OF SAID FIRST SIGNALS, ONE OF SAID PAIR OF SECOND SIGNALS BEING INDICATIVE OF ONE GROUP OF SAID PAIR OF GROUPS AND THE OTHER OF SAID PAIR OF SIGNALS BEING INDICATIVE OF SAID OTHER GROUP OF SAID PAIR OF GROUPS, MEANS RESPONSIVE TO ACTUATION OF ONE OF SAID DETERTOR ELEMENTS, FOR TRANSMITTING FROM SAID FIRST MEANS TO SAID CENTRAL STATION SAID ONE OF SAID FIRST SIGNALS INDICATIVE OF A PAIR OF GROUPS OF DETECTOR ELEMENTS OF SAID REMOTE STATION INCLUDING SAID ONE DETECTOR ELEMENT, AND FROM SAID SECOND MEANS ONE OF SAID SECOND SIGNALS INDICATIVE OF THE ONE OF SAID GROUPS WHICH INCLUDES SAID ONE DETECTOR ELEMENT, MEANS RESPONSIVE TO SAID TRANSMITTED FIRST AND SECOND SIGNALS, FOR INTERROGATING SAID REMOTE STATION, MEANS RESPONSIVE TO SUCH INTERROGATION AND TO SAID ACTUATION OF SAID ONE DETECTOR ELEMENT FOR TRANSMITTING TO SAID CENTRAL STATION FROM SAID FIRST MEANS ANOTHER OF SAID FIRST SIGNALS INDICATIVE OF THE ACTUATION OF SAID ONE DETECTOR ELEMENT,AND MEANS LOCATED AT SAID CENTRAL STATION, RESPONSIVE TO SUCH TRANSMITTED SIGNALS AND SPECIFIC TO SAID ONE DETECTOR ELEMENT, FOR INDICATING SUCH ACTUATION THEREOF.

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