# US 2019/0313698 A1 · Heated aerosol-generating device and method for generating aerosol with consistent properties > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0313698 A1 - Document ID: US20190313698A1 - Status: Published application - Kind: A1 - Application number: 16/446,451 - Filed: 2019-06-19 - Published: 2019-10-17 - Earliest claimed: 2012-12-28 - Assignees: Philip Morris Products S.A. - Applicants: Philip Morris Products S.A. - Inventors: Arkadiusz Kuczaj - Web page: https://patentgrep.com/patent/US20190313698A1 ## CPC - A24F 40/57: Temperature control - H05B 1/0225: {actuated by timers} - H05B 1/0244: {Heating of fluids (H05B1/0247 takes precedence)} - H05B 3/0014: {Devices wherein the heating current flows through particular resistances} - A24F 40/20: Devices using solid inhalable precursors - H05B 2203/021: Heaters specially adapted for heating liquids - A24F: SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES (inhaling appliances for medical purposes, shaped like cigars, cigarettes or pipes A61M15/06) - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A method of controlling an aerosol-generating device including a heater, the method including, over a period of more than 30 seconds, and independent of whether a user is puffing on the device or not: heating the heater to a first temperature, then heating the heater to a second temperature lower than the first temperature, and then heating the heater to a third temperature higher than the second temperature. There is also provided an aerosol-generating device including a heater and a controller; and there is also provided a system including the aerosol-generating device. ## Claims ### Claim 1 A method of controlling an aerosol-generating device comprising a heater, the method comprising, over a period of more than 30 seconds, and independent of whether a user is puffing on the device or not: heating the heater to a first temperature, then heating the heater to a second temperature lower than the first temperature, and then heating the heater to a third temperature higher than the second temperature. ### Claim 2 (depends on 1) The method of claim 1, wherein the heater heats a solid aerosol-forming substrate. ### Claim 3 (depends on 2) The method of claim 2, wherein the heater continuously heats the solid aerosol-forming substrate during implementation of the method so as to continuously generate an aerosol independent of whether the user is puffing on the device or not. ### Claim 4 (depends on 2) The method of claim 2, wherein heating the heater to the first, second, and third temperatures during implementation of the method introduces a time-modulated thermal gradient to the solid aerosol-forming substrate. ### Claim 5 (depends on 2) The method of claim 2, wherein the heater comprises an internal heating element disposed within the solid aerosol-forming substrate. ### Claim 6 (depends on 2) The method of claim 2, wherein the heater comprises an external heating element disposed outside of the solid aerosol-forming substrate. ### Claim 7 (depends on 1) The method of claim 1, wherein the heater comprises a resistive heater. ### Claim 8 (depends on 1) The method of claim 1, wherein the heater comprises more than one heating element, each of the heating elements being controlled to have a different heating profile. ### Claim 9 (depends on 1) The method of claim 1, wherein the heater is heated to the second temperature for a first plurality of puffs, and is heated to the third temperature for a second plurality of puffs after the first plurality of puffs. ### Claim 10 A method of controlling an aerosol-generating device comprising a heater, the method comprising, over a period of more than 30 seconds, and independent of whether a user is puffing on the device or not: heating the heater to a first temperature, and then heating the heater to a second temperature lower than the first temperature. ### Claim 11 (depends on 10) The method of claim 10, wherein the heater heats a solid aerosol-forming substrate, and wherein the heater comprises an external heating element disposed outside of the solid aerosol-forming substrate. ### Claim 12 (depends on 10) The method of claim 10, further comprising heating the heater to at least one additional temperature. ### Claim 13 (depends on 10) The method of claim 10, wherein the heater comprises more than one heating element. ### Claim 14 A method of controlling an aerosol-generating device comprising a heater, the method comprising, over a period of more than 30 seconds, and independent of whether a user is puffing on the device or not: heating the heater to a first temperature, and then heating the heater to a second temperature higher than the first temperature. ### Claim 15 (depends on 14) The method of claim 14, wherein the heater heats a solid aerosol-forming substrate, and wherein the heater comprises an external heating element disposed outside of the solid aerosol-forming substrate. ### Claim 16 (depends on 14) The method of claim 14, further comprising heating the heater to at least one additional temperature. ### Claim 17 (depends on 14) The method of claim 14, wherein the heater comprises more than one heating element. ### Claim 18 An aerosol-generating device comprising a heater and a controller, the controller configured to perform operations comprising, over a period of more than 30 seconds, and independent of whether a user is puffing on the device or not: heating the heater to a first temperature, then heating the heater to a second temperature lower than the first temperature, and then heating the heater to a third temperature higher than the second temperature. ### Claim 19 (depends on 18) A system comprising the device of claim 18 and a solid aerosol-forming substrate heated by the heater. ### Claim 20 (depends on 19) The system of claim 19, wherein the heater continuously heats the solid aerosol-forming substrate during implementation of the method so as to continuously generate an aerosol independent of whether the user is puffing on the device or not. ### Claim 21 (depends on 19) The system of claim 19, wherein heating the heater to the first, second, and third temperatures during implementation of the method introduces a time-modulated thermal gradient to the solid aerosol-forming substrate. ### Claim 22 (depends on 19) The system of claim 19, wherein the heater comprises an internal heating element disposed within the solid aerosol-forming substrate. ### Claim 23 (depends on 19) The system of claim 19, wherein the heater comprises an external heating element disposed outside of the solid aerosol-forming substrate. ### Claim 24 (depends on 18) The device of claim 18, wherein the heater comprises a resistive heater. ### Claim 25 (depends on 18) The device of claim 18, wherein the heater comprises more than one heating element, and wherein the controller is configured to control each of the heating elements to have a different heating profile. ### Claim 26 (depends on 18) The device of claim 18, wherein the controller is configured to control heating of the heater to the second temperature for a first plurality of puffs, and to the third temperature for a second plurality of puffs after the first plurality of puffs. ### Claim 27 An aerosol-generating device comprising a heater and a controller, the controller configured to implement operations comprising, over a period of more than 30 seconds, and independent of whether a user is puffing on the device or not: heating the heater to a first temperature, and then heating the heater to a second temperature lower than the first temperature. ### Claim 28 (depends on 27) A system comprising the device of claim 27 and a solid aerosol-forming substrate heated by the heater, wherein the heater comprises an external heating element disposed outside of the solid aerosol-forming substrate. ### Claim 29 (depends on 27) The device of claim 27, wherein the controller is configured to control heating of the heater to at least one additional temperature. ### Claim 30 (depends on 27) The device of claim 27, wherein the heater comprises more than one heating element. ### Claim 31 An aerosol-generating device comprising a heater and a controller, the controller configured to implement operations comprising, over a period of more than 30 seconds, and independent of whether a user is puffing on the device or not: heating the heater to a first temperature, and then heating the heater to a second temperature higher than the first temperature. ### Claim 32 (depends on 31) A system comprising the device of claim 31 and a solid aerosol-forming substrate heated by the heater, wherein the heater comprises an external heating element disposed outside of the solid aerosol-forming substrate. ### Claim 33 (depends on 31) The device of claim 31, wherein the controller is configured to control heating of the heater to at least one additional temperature. ### Claim 34 (depends on 31) The device of claim 31, wherein the heater comprises more than one heating element.