Electronic smoking article

• US 9,993,023 B2
• Filed: 02/20/2014
• Issued: 06/12/2018
• 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:
  US14/185,259
• Publication Number:
  US 20140238423A1
• Time in Patent Office: 1,573 Days
• Field of Search: 392395
• 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 liquid supply region including a liquid material;

an integral heater-wick element in fluidic communication with the liquid supply region, the integral heater-wick element including a heatable portion and at least one wicking portion formed of at least two layers of electrically resistive mesh material, the at least one wicking portion extending into the liquid supply region;

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

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

2. The electronic vaping device of claim 1, wherein the electrically resistive mesh material comprises at least one of stainless steel, copper, copper alloys, ceramic materials coated with film resistive material, nickel-chromium alloys, and combinations thereof.

3. The electronic vaping device of claim 1, wherein the electrically resistive mesh material is about 200 to about 600 mesh.

4. The electronic vaping device of claim 3, wherein the electrically resistive mesh material is about 400 mesh.

5. The electronic vaping device of claim 1, wherein the electrically resistive mesh material is formed with 0.001 inch diameter wire.

6. The electronic vaping device of claim 1, wherein the integral heater-wick element has a length ranging from about 10 mm to about 15 mm and a width ranging from about 0.5 mm to about 2.0 mm.

7. The electronic vaping device of claim 1, wherein each layer of the electrically resistive mesh material is elongated and planar.

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

9. The electronic vaping device of claim 1, wherein the heatable portion is contained within a central air channel.

10. The electronic vaping device of claim 1, wherein the at least two layers of electrically resistive mesh material are three or more layers of the electrically resistive mesh material.

11. 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.

12. The electronic vaping device of claim 1, wherein the electrically resistive mesh material is formed with wire having a diameter of greater than about 0.001 inch.

15. The electronic vaping device of claim 1, wherein only the wicking portion of the integral heater-wick element extends into the liquid supply region.

16. The electronic vaping device of claim 1, wherein the at least one connection structure includes a first connection structure and a second connection structure, the heatable portion of the integral heater-wick element being between the first connection structure and the second connection structure.

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

an outer tube; and

an inner tube defining a central air channel,

wherein the outer tube and the inner tube define an annulus in between, the at least one connection structure disposed in the annulus.

18. The electronic vaping device of claim 1, wherein the at least one connection structure is in the liquid supply region.

19. The electronic vaping device of claim 1, wherein the at least one electrical lead is in the liquid supply region.

13. A method of improving vaporization in an electronic vaping device, the method comprising:

transferring a liquid material from a liquid supply region to a channel using an integral heater-wick element including a heatable portion and at least one wicking portion formed of at least two layers of electrically resistive mesh material, the at least one wicking portion extending into the liquid supply region; and

directing an electrical current through the heatable portion via at least one electrical lead connected to at least one connection structure wrapped around the integral heater-wick element to at least partially volatilize the liquid material.

14. The method of claim 13, wherein the transferring transfers the liquid material to the channel via only the wicking portion of the integral heater-wick element.