Electronic smoke detector and fire alarm

Claim 1

AN ALARM SYSTEM ADAPTED FOR CONNECTION TO A SOURCE OF ELECTRICAL POWER COMPRISING (A) AN ALARM CIRCUIT ADAPTED FOR CONNECTION TO SAID SOURCE OF ELECTRICAL POWER AND INCLUDING SWITCHING MEANS AND MEANS PRODUCING AN ALARM UPON CLOSING OF SAID SWITCHING MEANS, (B) AN ALARM RELAY CIRCUIT INCLUDING AN INDUCTOR AND OPERABLE TO CLOSE SAID SWITCHING MEANS UPON DE-ENERGIZING OF SAID INDUCTOR, (C) A CONTROL CIRCUIT INCLUDING A SOLID STATE SWITCH DEVICE SERIES CONNECTED WITH SAID INDUCTOR AND OPERABLE TO ENERGIZE AND DE-ENERGIZE SAID INDUCTOR IN RESPONSE TO CHANGES IN THE VOLTAGE IMPRESSED UPON THE INPUT SIDE OF SAID SWITCH DEVICE, (D) SAID CONTROL CIRCUIT FURTHER COMPRISING A GASEOUS INCANDESCENT LAMP AND MEANS REGULATING THE VOLTAGE TO SAID LAMP TO PRODUCE A SUBSTANTIALLY CONSTANT LIGHT SOURCE FROM SAID LAMP, A PHOTOCONDUCTIVE CELL ADJACENT SAID LAMP TO RECEIVE LIGHT ENERGY EMITTED THEREFROM AND BEING SERIES CONNECTED TO THE INPUT SIDE OF SAID SOLID STATE SWITCH DEVICE WHEREBY VARIATIONS IN THE LIGHT INTENSITY RECEIVED BY SAID PHOTOCONDUCTIVE CELL CAUSED BY PARTICLES INTERMEDIATE SAID LAMP AND SAID CELL WILL PRODUCE A VARIATION IN THE VOLTAGE IMPRESSED UPON THE INPUT SIDE OF SAID SOLID STATE WHICH DEVICE, AND A NORMALLY CLOSED THERMOSTAT SWITCH SERIES CONNECTED WITH SAID SWITCH AND BEING OPERABLE TO OPEN UPON BEING HEATED TO A PREDETERMINED TEMPERATURE.