A method for controlling the supply of liquid to an aerosol generator comprises operating a liquid supply system to supply a liquid to a vibratable aperture plate of an aerosol generator which senses an amount of liquid adhering to the vibratable aperture plate, and controls operation of the liquid supply...http://www.google.de/patents/US7040549?utm_source=gb-gplus-sharePatent US7040549 - Systems and methods for controlling fluid feed to an aerosol generator
