Electronic smoking article

• US 10,321,720 B2
• Filed: 05/29/2018
• Issued: 06/18/2019
• Est. Priority Date: 02/22/2013
• Status: Active Grant

• Current Assignee: Altria Client Services LLC (Altria Group, Inc.)
• Original Assignee: Altria Client Services LLC (Altria Group, Inc.)
• Inventors: Tucker, Christopher S., Jordan, Geoffrey Brandon
• Primary Examiner(s): Yaary, Eric
• Application Number:
  US15/991,250
• Publication Number:
  US 20180271170A1
• Time in Patent Office: 385 Days
• CPC Class Codes: A24F 40/10 Devices using liquid inhalable precursors
• CPC Class Codes: A24F 40/44 Wicks
• CPC Class Codes: A24F 40/46 Shape or structure of electric heating means

Abstract

An electronic smoking article includes a liquid supply region including liquid material and a heater-wick element operable to wick liquid material and heat the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol. The heater-wick element comprises two or more layers of electrically resistive mesh material.

Claims

1. An electronic vaping device comprising:

a housing defining an air channel and a liquid supply region configured to hold a liquid material, the housing including an outer tube and an inner tube within the outer tube, the inner tube defining the air channel, the outer tube and the inner tube defining the liquid supply region in between; and

an integral heater-wick element configured to transfer the liquid material from the liquid supply region to the air channel via capillary action, the integral heater-wick element formed of at least two layers of electrically resistive mesh material and including a heatable portion and a wicking portion, the wicking portion extending into the liquid supply region and circumferentially around the inner tube, the heatable portion of the integral heater-wick element disposed in the air channel and configured to vaporize the liquid material.

2. The electronic vaping device of claim 1, wherein the electrically resistive mesh material has an electrical resistance ranging from about 0.3 Ohm to about 10 Ohms.

3. The electronic vaping device of claim 1, wherein the electrically resistive mesh material has a size ranging from 200 to 600 mesh.

4. The electronic vaping device of claim 1, wherein the electrically resistive mesh material is formed with wire having a diameter ranging from 0.0010 inch to 0.0016 inch.

5. The electronic vaping device of claim 1, wherein the electrically resistive mesh material includes a metal, an alloy, a composite material, or combinations thereof.

6. The electronic vaping device of claim 1, wherein each of the at least two layers of electrically resistive mesh material is elongated and planar.

7. The electronic vaping device of claim 1, wherein the at least two layers of electrically resistive mesh material are connected along a length thereof.

8. The electronic vaping device of claim 1, wherein the at least two layers of electrically resistive mesh material are pressed together without brazing, soldering, or application of adhesive.

9. The electronic vaping device of claim 1, wherein the at least two layers of electrically resistive mesh material includes four or more layers of the electrically resistive mesh material.

10. The electronic vaping device of claim 1, wherein the wicking portion includes a first wicking portion and a second wicking portion extending in opposite directions, the first wicking portion disposed at one end of the heatable portion of the integral heater-wick element, the second wicking portion disposed at an opposing end of the heatable portion of the integral heater-wick element.

11. The electronic vaping device of claim 1, wherein the heatable portion of the integral heater-wick element has a section that extends within the air channel and along a length of the inner tube.

12. The electronic vaping device of claim 1, wherein the wicking portion extends in a spiral around the inner tube.

13. The electronic vaping device of claim 1, further comprising:

at least one connection structure wrapped about the integral heater-wick element; and

at least one electrical lead connected to the at least one connection structure.

14. The electronic vaping device of claim 13, wherein the at least one connection structure is in the liquid supply region.

15. The electronic vaping device of claim 13, wherein the at least one connection structure is in the air channel.

16. The electronic vaping device of claim 13, wherein the at least one electrical lead is in the liquid supply region.

17. The electronic vaping device of claim 13, wherein the at least one electrical lead has a section disposed in the air channel.

18. An electronic vaping device comprising:

a housing defining an air channel and a liquid supply region configured to hold a liquid material, the housing including an outer tube and an inner tube within the outer tube, the inner tube defining the air channel, the outer tube and the inner tube defining the liquid supply region in between; and

an integral heater-wick element configured to transfer the liquid material from the liquid supply region to the air channel via capillary action, the integral heater-wick element formed of at least two layers of electrically resistive mesh material and including a heatable portion and a wicking portion, the wicking portion being in fluidic communication with the liquid supply region and extending circumferentially around the inner tube, the heatable portion of the integral heater-wick element disposed in the air channel and configured to vaporize the liquid material.