Patent ID: 7544332
Filing Date: 2009-06-09
Classification: A01M,A61L,F24F,G01N

Abstract:
1. An air treatment chemical dispensing system, comprising: a first substrate bearing a first volatile air treatment chemical capable of being dispensed from the first substrate when the first substrate is heated; a second substrate bearing a second volatile air treatment chemical capable of being dispensed from the second substrate when the second substrate is heated; an indicator unit holding a volatile indicator chemical separate from both the first volatile air treatment chemical and the second volatile air treatment chemical; wherein the second substrate is in a form of a porous structure stacked over the first substrate and has an opening in the form of an axial pathway; wherein the indicator unit is stacked over the second substrate; and wherein the dispensing system is configured such that heat from the first substrate is able to pass through the axial pathway of the second substrate to the indicator unit.