Radio receiver combined conelrad alarm apparatus having time delay apparatus selectively responsive to conelrad code

Claim 1

IN ALARM CONTROL APPARATUS: SOURCE OF ELECTRICAL POWER; AN ELECTRICALLY RESPONSIVE ALARM INDICATOR; A NORMALLY OPEN OPERATING CIRCUIT FOR COUPLING SAID INDICATOR WITH SAID SOURCE OF ELECTRICAL POWER; OPERATING CIRCUIT CONTROL MEANS FOR CLOSING SAID OPERATING CIRCUIT AND INCLUDING A PAIR OF DEVICES OPERABLY COUPLED WITH SAID OPERATING CIRCUIT AND EACH HAVING AN INOPERATED CONDITION AND AN OPERATED CONDITION, SAID CONTROL MEANS BEING ARRANGED FOR EFFECTIVE CLOSURE OF SAID OPERATING CIRCUIT ONLY IN RESPONSE TO OCCURENCE OF SAID OPERATED CONDITION IN BOTH OF SAID DEVICES SIMULTANEOUSLY; RECEIVING MEANS FOR RECEIVING TRANSMISSIONS OF ELECTRICAL ALARM CONTROLLING SIGNALS CHARACTERIZED BY PREDETERMINED INTERVALS OF RELATIVELY HIGH FREQUENCY CARRIER SIGNALS, OF A SINGLE PRESELECTED FREQUENCY RELATIVELY LOWER FREQUENCY MODULATION COMPONENT SIGNALS SUPERIMPOSED UPON SAID CARRIER SIGNALS, AND INTERVALS OF NO TRANSMISSION OF EITHER THE CARRIER OR THE MODULATED CARRIER SIGNALS; FIRST CONTROL COUPLING MEANS OPERABLY COUPLING ONE OF SAID DEVICES WITH SAID RECEIVING MEANS FOR CONTROLLING THE CONDITION OF SAID ONE DEVICE RESPONSIVE TO THE INTERVALS OF NO TRANSMISSION OF SAID CARRIER OR MODULATED CARRIER SIGNALS; AND SECOND CONTROL COUPLING MEANS OPERABLY COUPLING THE OTHER OF SAID DEVICES WITH SAID RECEIVING MEANS FOR CONTROLLING THE CONDITION OF SAID OTHER DEVICE RESPONSIVE TO THE INTERVALS OF TRANSMISSION OF SAID MODULATION COMPONENT SIGNALS IN SAID CONTROLLING SIGNALS.