Disclosed are a chemical carrier body capable of volatilizing a chemical stably for an extended period of time, a receptacle for retaining the chemical carrier body, an indicator adapted for displaying a degree of consumption of a chemical contained in the chemical carrier body, and a chemical heating,...http://www.google.com/patents/US7449154?utm_source=gb-gplus-sharePatent US7449154 - Chemical-containing formed material of type of heating of whole the material, container for holding chemical-containing formed material, device for heating and transpiring chemical and indicator for chemical to be heated and vaporized
