Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1977-03-24
1978-09-12
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
With particular system function
340543, G08B 2900
Patent
active
041141474
ABSTRACT:
A property protection alarm system is disclosed for protecting property against unauthorized intrusion and the like. The alarm system includes a numeric key board and a code combination logic circuit for arming an alarm energization circuit in response to the proper entry of a predetermined numeric code in the numeric keyboard. This predetermined code must be entered within a given period of time determined by the code combination logic circuit. In addition, the numeric key associated with the last digit of the predetermined code must be depressed for a given period of time as also determined by the code combination logic circuit. An exit delay circuit is connected to the output of the code combination logic circuit for delaying the arming of the alarm energization circuit in order to permit an authorized operator to leave the property without energizing the alarm. The alarm energization circuit is connected to a sensing circuit for sensing any intrusion of the property. The alarm energization circuit is capable of triggering a local alarm upon any intrusion of the property including an authorized intrusion. On the other hand, the alarm energization circuit includes an entrance delay circuit which delays the energization of an external alarm to enable an authorized user to disarm the alarm energization circuit by entering the predetermined numeric code in the numeric keyboard before the expiration of the time period provided by the entrance delay circuit.
REFERENCES:
patent: 3544987 (1970-12-01), McMann, Jr. et al.
patent: 3881171 (1975-04-01), Moorman et al.
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