A simplified vaporizing dispenser features snap attachment of a base cap to an inverted container, positive "ON" and "OFF" adjustments for the respective activation and deactivation of the dispenser, the use of an absorbent sheet shaped in the form of the frustum of a cone with the narrow end inserted...http://www.google.fr/patents/US4537351?utm_source=gb-gplus-shareBrevet US4537351 - Liquid air freshener dispenser
