Alarm annunciator circuitry

Claim 1

IN A SOLID-STATE ELECTRONIC ALARM ANNUNCIATOR OF THE TYPE WHEREIN THE DETECTION OF AN ABNORMAL CONDITION YIELDS AN INTERMITTENTLY-OCCURING INDICATION, THE CIRCUITRY COMPRISING A TWO-TERMINAL SOURCE OF ELECTRICAL ENERGY, A PLURALITY OF INDICATING CIRCUITS ELECTRICALLY CONNECTED TO SAID TWO-TERMINAL SOURCE, EACH INDICATING CIRCUIT INCLUDING INDICATING MEANS AND A UNIDIRECTIONAL-CURRENT CONTROL DEVICE HAVING A GATING TERMINAL AND A NORMALLY-NONCONDUCTING CURRENT CONDUCTION PATH CONNECTED IN SERIES CIRCUIT WITH SAID INDICATING MEANS, SAID CURRENT CONDUCTION PATH BEING SWITCHABLE TO ITS CONDUCTING STATE UPON THE APPLICATION OF A PREDETERMINED SIGNAL TO SAID GATING TERMINAL, SAID INDICATING CIRCUITS FURTHER INCLUDING FIRST AND SECOND PARALLEL CIRCUITS BRANCHING FROM SAID CONTROL DEVICE AND CONVERGING AT ONE OF SAID TERMINALS OF SAID TWO-TERMINAL SOURCE, EACH OF SAID FIRST PARALLEL CIRCUITS OF SAID PLURALITY OF INDICATING CIRCUITS BEING CONNECTED BY A COMMON BUS LEAD AND INCLUDING MEANS TO ISOLATE ITS ASSOCITATED CONTROL DEVICE FROM THE OTHER OF SAID CONTROL DEVICES, AND INTERMITTENTLY-OPERATED CURRENT CONDUCTION MEANS CONNECTED BETWEEN SAID BUS LEAD CONNECTING SAID FIRST PARALLEL CIRCUITS, AND SAID TERMINAL, WHEREBY, UPON ACTUATION OF ONE OF SAID INDICATING CIRCUITS, SAID FIRST AND SECOND PARALLEL CIRCUITS PROVIDE FOR THE SUSTAINED CONDUCTION OF THE ACTUATED CONTROL DEVICE TOGETHER WITH THE SIMULTANIOUS INTERMITTENT OPERATION OF SAID INTERMITTENTLY-OPERATED CURRENT CONDUCTING MEANS.