Patent No. EP4118988 (titled "Aerosol Generation Device, And Method And Program For Operating Same") was filed by Japan Tobacco, Inc. on Jun 22, 2018. The application was issued on Oct 1, 2025.
An aerosol generation device comprises a storage unit for an aerosol source or base material, a load that generates heat to atomize the source, a sensor, and a control unit. The load is characterized by physical properties that change when heated to a temperature achievable only upon depletion of the aerosol source or base material. Specifically, the load's steady-state physical property value after cooling from this depletion-induced temperature differs from its initial steady-state value. The sensor outputs a value related to these physical properties. The control unit determines if depletion has occurred by analyzing the sensor's output value in a steady state after the load has reached or exceeded the atomization temperature.

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