Abstract: An insecticide dispenser capable of setting off a charge of insecticide to fumigate a room and then automatically shutting itself off before the completion of the dispensing of the charge of the insecticide, whereby the dispenser can be safely left unattended during the fumigation of a room. The dispenser includes a container for the insecticide and a fusible member that will break during the volatilization of the insecticide thereby to break the electrical circuit and turn off the power supply.

Abstract: An insecticide dispenser capable of initiating the volatilization of a charge of insecticide to fumigate a room and then automatically shutting itself off during, or at the completion of the dispensing of the insecticide, whereby the dispenser can be safely left unattended during the fumigation of a room. The dispenser includes a container for the insecticide disposed upon a PTC heater, the elements being arranged adjacent a bimetal switching device that opens upon sensing a predetermined temperature, and can hold itself in the open position until intentionally reset. When the electrical circuit is open, the power supply to the PTC heater is broken and the heating will be discontinued.

Abstract: An insecticide dispenser capable of initiating the volatilization of a charge of insecticide to fumigate a room. The dispenser includes a container for the insecticide that is disposed upon a PTC heater. One side of the power supply necessary to initiate the chemical reaction passes directly through the cannister to the PTC heater. The other side of the power supply is connected through a support upon which the PTC heater rests. In the preferred embodiment, an electrical cut-off device is included in the circuit which will turn off the power when a predetermined temperature is attained which will be indicative of the initiation of the self-sustaining chemical reaction that causes the dispensing of the insecticide into the room.