Constant surveillance alarm system for a plurality of remote locations

Claim 1

A CONSTANT SURVEILLANCE ALARM SYSTEM IN WHICH A PLURALITY OF REMOTE ZONES ARE ELECTRICALLY MONITORED FROM A CENTRAL MONITORING STATION COMPRISING IN COMBINATION: A SOURCE OF SUPPLY VOLTAGE; AT LEAST ONE ALARM SENSING MEANS LOCATED IN EACH OF SAID PLURALITY OF REMOTE ZONES AND BEING OPERABLE IN RESPONSE TO AN ALARM CONDITION TO CHANGE OPERATING STATES AND INCLUDING CIRCUIT MEANS FOR COUPLING A SUPPLY VOLTAGE TO ONE SIDE OF SAID ALARM SENSING MEANS FROM SAID SOURCE OF SAID SUPPLY VOLTAGE; A ZONE ALARM COUPLED TO SAID AT LEAST ONE ALARM SENSING MEANS INCLUDING, FIRST SEMICONDUCTOR SWITCH MEANS COUPLED TO THE OTHER SIDE OF SAID ALARM SENSING MEANS IN EACH ZONE AND ALSO TO SAID SOURCE OF SUPPLY VOLTAGE SO AS TO BE RENDERED CONDUCTIVE UPON THE OCCURRENCE OF AN ALARM CONDITION, RELAXATION OSCILLATOR CIRCUIT MEANS COUPLED BETWEEN SAID OTHER SIDE OF SAID ALARM SENSING MEANS AND SAID FIRST SEMICONDUCTOR SWITCH MEANS SO AS TO BECOME OPERABLE BY APPLICATION OF SAID SUPPLY VOLTAGE THERETO WHEN SAID FIRST SEMICONDUCTOR SWITCH MEANS BECOMES CONDUCTIVE, FIRST ALARM INDICATOR MEANS FOR EACH ZONE OF SAID PLURALITY OF REMOTE ZONES COUPLED BETWEEN SAID OTHER SIDE OF SAID ALARM SENSING MEANS IN EACH ZONE AND SAID RELAXATION OSCILLATOR CIRCUIT FORMING A PORTION OF THE LOAD CIRCUIT THEREOF SO AS TO BE INTERMITTENTLY ENERGIZED UPON THE OCCURRENCE OF AN ALARM CONDITION IN THE RESPECTIVE ZONE BY OPERATION OF THE RELAXATION OSCILLATOR CIRCUIT, SECOND SEMICONDUCTOR SWITCH MEANS COUPLED TO EACH OF SAID FIRST INDICATOR MEANS, AND SWITCH MEANS COUPLED TO SAID FIRST SEMICONDUCTOR SWITCH MEANS AND SAID SECOND SEMICONDUCTOR SWITCH MEANS WHICH WHEN ACTIVATED RENDERS SAID FIRST SEMICONDUCTOR SWITCH MEANS NON-CONDUCTIVE AND RENDERS SAID SECOND SEMICONDUCTOR SWITCH MEANS CONDUCTIVE WHEN AN ALARM CONDITION EXISTS IN THE RESPECTIVE ZONE TO CONTINUOUSLY ENERGIZE SAID FIRST ALARM INDICATOR MEANS; AND AN ALARM POINT CIRCUIT FOR EACH ZONE INCLUDING, THIRD SEMICONDUCTOR SWITCH MEANS COUPLED TO THE OTHER SIDE OF SAID ALARM SENSING MEANS AND BEING RESPONSIVE THERETO TO BECOME CONDUCTIVE WHEN A SUPPLY VOLTAGE IS APPLIED THERETO AND THE RESPECTIVE ALARM SENSING MEANS CHANGES OPERATING STATES, A SECOND ALARM INDICATOR MEANS COUPLED BETWEEN SAID SOURCE OF SUPPLY VOLTAGE AND SAID THRID SEMICONDUCTOR SWITCH MEANS BECOMING ENERGIZED WHEN SAID THIRD SEMICONDUCTOR SWITCH MEANS BECOMES CONDUCTIVE, AND ANOTHER SWITCH MEANS COUPLED BETWEEN SAID SOURCE OF SUPPLY VOLTAGE AND SAID THIRD SEMICONDUCTOR SWITCH MEANS FOR SELECTIVELY APPLYING A SUPPLY VOLTAGE THERETO, SAID THIRD SEMICONDUCTOR SWITCH MEANS BECOMING CONDUCTIVE THEREBY WHEN AN ALARM CONDITION EXISTS AT SAID ALARM SENSING MEANS WHEREBY SAID SECOND ALARM INDICATOR MEANS IS ENERGIZED.