According to the present invention there is provided an improved heat activated dispenser for releasing a vaporizable material into the ambient atmosphere. The inventive heat activated dispenser is made of a material which imparts excellent thermal insulating properties which control the rate of vaporization...http://www.google.fr/patents/US4849181?utm_source=gb-gplus-shareBrevet US4849181 - Heat activated dispenser for vaporizable materials
Heat activated dispenser for vaporizable materials
