Electronic cigarette

Patent metadata

Field	Value
Publication number	US-9848656-B2
Application number	US-201615248116-A
Country	US
Kind code	B2
Filing date	Aug 26, 2016
Priority date	Jan 31, 2012
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

An electronic smoking article includes an outer tube extending in a longitudinal direction, an inner tube within the outer tube and including a pair of opposing slots, a liquid supply comprising a liquid material, a coil heater, a wick and a mouth end insert. The coil heater is located in the inner tube. The coil heater is formed of an iron-free, nickel-chromium alloy and has substantially uniformly spaced windings. The wick is surrounded by the coil heater such that the wick delivers liquid material to the coil heater and the coil heater heats the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol in the inner tube.

First claim

We claim:

1. An electronic article comprising:
an outer tube extending in a longitudinal direction, the outer tube defining a portion of a liquid supply region configured to store a liquid material;
an inner tube within the outer tube, the inner tube including a pair of opposing slots, the liquid supply region between the outer tube and the inner tube;
a coil heater in the inner tube;
a wick in communication with the liquid supply region, the wick at least partially surrounded by the coil heater, and end portions of the wick extending through the opposing slots in the inner tube;
a closure ring including an edge at an end thereof, the closure ring being positioned around a portion of the inner tube, such that the edge is proximate to portions of the wick outside the inner tube, the closure ring does not overlap with the wick, and the closure ring covers only a portion of each of the opposing slots; and
a power supply configured to supply power to the coil heater.

2. The electronic article of claim 1 , wherein the coil heater is formed of a nickel-chromium alloy.

3. The electronic article of claim 2 , wherein the nickel-chromium alloy is essentially iron-free.

4. The electronic article of claim 1 , wherein the coil heater has substantially uniformly spaced windings.

5. The electronic article of claim 4 , wherein the coil heater comprises 3 to 8 substantially uniformly spaced windings.

6. The electronic article of claim 1 , wherein the inner tube has a diameter of about 4 mm and each of the opposing slots has major and minor dimensions of about 2 mm by about 4 mm.

7. The electronic article of claim 1 , wherein the electronic article comprises a single outer tube.

8. The electronic article of claim 1 , further comprising:
a power supply electrically connected to the coil heater.

9. The electronic article of claim 1 , wherein the inner tube is formed of a woven fiberglass material.

10. The electronic article of claim 1 , wherein the wick includes a plurality of filaments.

11. A cartridge of an electronic article comprising:
an outer tube extending in a longitudinal direction, the outer tube defining a portion of a liquid supply region configured to store a liquid material;
an inner tube within the outer tube, the inner tube including a pair of opposing slots, the liquid supply region between the outer tube and the inner tube;
a coil heater in the inner tube;
a wick in communication with the liquid supply region, the wick at least partially surrounded by the coil heater, and end portions of the wick extending through the opposing slots in the inner tube; and
a closure ring including an edge at an end thereof, the closure ring being positioned around a portion of the inner tube, such that the edge is proximate to portions of the wick outside the inner tube, the closure ring does not overlap with the wick, and the closure ring covers only a portion of each of the opposing slots.

12. The cartridge of claim 11 , wherein the coil heater is formed of a nickel-chromium alloy.

13. The cartridge of claim 12 , wherein the nickel-chromium alloy is essentially iron-free.

14. The cartridge of claim 11 , wherein the coil heater has substantially uniformly spaced windings.

15. The cartridge of claim 14 , wherein the coil heater comprises 3 to 8 substantially uniformly spaced windings.

16. The cartridge of claim 11 , wherein the inner tube has a diameter of about 4 mm and each of the opposing slots has major and minor dimensions of about 2 mm by about 4 mm.

17. The cartridge of claim 11 , wherein the inner tube is formed of a woven fiberglass material.

18. The cartridge of claim 11 , wherein the wick includes a plurality of filaments.

Assignees

• Altria Client Services Llc

Inventors

• Tucker Christopher S
• Jordan Geoffrey Brandon
• Smith Barry S
• Rostami Ali A
• Mullins Michael J

Classifications

• H05B1/0244

  Heating of fluids (H05B1/0247 takes precedence) · CPC title

• A61M11/001

  Particle size control · CPC title

• Y10T29/49083

  Heater type · CPC title

• A61M2016/0018

  electrical · CPC title

• H05B3/44

  heating conductor arranged within rods or tubes of insulating material · CPC title