Carbon conductive substrate for electronic smoking article

• US 10,701,979 B2
• Filed: 11/30/2018
• Issued: 07/07/2020
• Est. Priority Date: 08/28/2013
• Status: Active Grant

• Current Assignee: RAI STRATEGIC HOLDINGS, INC. (British American Tobacco PLC)
• Original Assignee: RAI STRATEGIC HOLDINGS, INC. (British American Tobacco PLC)
• Inventors: Davis, Michael F., Ademe, Balager, Banerjee, Chandra Kumar, Pike, Susan K., Griffith, Jr., David William, Sears, Stephen Benson, Crooks, Evon L., Williams, Karen V., Nestor, Timothy Brian, Bovender, David
• Primary Examiner(s): Del Sole, Joseph S
• Assistant Examiner(s): Ahmed Ali, Mohamed K
• Application Number:
  US16/205,524
• Publication Number:
  US 20190090548A1
• Time in Patent Office: Days
• CPC Class Codes: A24F 40/10 Devices using liquid inhalable precursors
• CPC Class Codes: A24F 40/42 Cartridges or containers for inhalable precursors
• CPC Class Codes: A24F 40/44 Wicks
• CPC Class Codes: A24F 40/46 Shape or structure of electric heating means

Abstract

The present disclosure provides components useful in heating, particularly heating of an aerosol precursor solution so as to vaporize the solution and form an aerosol. The disclosure particularly provides an electrically conductive, porous carbon heater. The heater may be combined with an aerosol precursor transport element that also is formed of carbon. The heater and transport element may form an atomizer that can be useful in an electronic smoking article, such as in a cartridge that is adapted for attachment to a control body. In some embodiments, the disclosure provides a cartridge of an electronic smoking article, the cartridge being formed substantially completely of carbon.

Claims

1. An electronic smoking article comprising an electrical power source, an elongated, electrically resistive heater formed of a porous carbon, the porous carbon heater having a first end and a second, opposing end adapted for electrical connection with the electrical power source, wherein a majority of the pores in the porous carbon heater are closed pores, and an aerosol precursor transport element arranged so as to be in fluid connection with the porous carbon heater, wherein the aerosol precursor transport element is formed of carbon fibers.

2. The electronic smoking article of claim 1, wherein the dry mass of the porous carbon is about 90% or greater carbon.

3. The electronic smoking article of claim 1, wherein the dry mass of the carbon fiber aerosol precursor transport element is about 85% or greater carbon.

4. The electronic smoking article of claim 1, further comprising an electrical connector having a first end in electrical connection with the second end of the porous carbon heater and having a second, opposing end adapted for electrical connection with the electrical power source.

5. The electronic smoking article of claim 4, wherein the electrical connector is formed of graphite.

6. The electronic smoking article of claim 4, wherein the porous carbon heater is arranged within a cartridge housing and the electrical power source is arranged within a separate control body housing.

7. The electronic smoking article of claim 6, wherein the cartridge housing is formed of a carbon material.

8. The electronic smoking article of claim 6, wherein the cartridge housing has a first end proximate the first end of the porous carbon heater and a second end proximate the second end of the electrical connector, and wherein the second end of the housing is adapted for forming a structural connection with a first end of the control body housing.

9. The electronic smoking article of claim 8, wherein the first end of the cartridge housing comprises a wall including an alignment recess adapted to engage the first end of the porous carbon heater, and wherein the engagement forms an electrical connection between the porous carbon heater and the housing.

10. The electronic smoking article of claim 9, wherein the electrical connector, the porous carbon heater, and the housing form an electrical circuit.

11. The electronic smoking article of claim 1, further comprising an aerosol precursor material.

12. An electronic smoking article comprising an electrical power source, a liquid storage element and an electrically resistive heater formed of a porous carbon, wherein the porous carbon heater is in a wire-free electrical connection with the electrical power source, wherein a majority of the pores in the porous carbon heater are closed pores, and an aerosol precursor transport element arranged so as to be in fluid connection with the porous carbon heater, wherein the aerosol precursor transport element is formed of carbon fibers.