US Patent 10512738 Dual chamber vaporization tank

A dual chamber vaporization tank comprises an inner tube, an intermediate tube, an outer tube, and a mouthpiece assembly. An e-liquid chamber is defined by a first annulus between the inner tube and the intermediate tube. The tank further comprises a porous ceramic ring having a heating coil disposed on an inner surface and an outer surface in fluid communication with the e-liquid chamber. An airflow path is defined from the surrounding air through an airflow aperture into a second annulus between the intermediate tube and the outer tube, along the second annulus in a first direction, through the heating coil in a second direction opposite the first direction, and through the inner tube.