Patent ID: 8857731
Filing Date: 2014-10-14
Classification: A01M,A61L,G01F

Abstract:
1. A volatile substance evaporator indicating an end-of-life condition of the volatile substance, the evaporator comprising: a volatile substance comprising an infrared light absorbing additive; a container holding the volatile substance; a wick having a lower part and an upper part, the lower part disposed inside the container and the upper part disposed outside of the container, the wick wicking the volatile substance from the lower part to the upper part, the upper part comprising an infrared light reflecting material; an infrared light emitter for emitting infrared light onto the upper part, a receptor for detecting the infrared light reflected from the upper part; wherein the upper part reflects the infrared light relative to an amount of the volatile substance present in the upper part; wherein the receptor determines an end-of-life condition of the volatile substance based on a pre-determined amount of infrared light detected.