A marking apparatus is disclosed in which a propellant stream is passed through a channel and directed toward a substrate. Marking material, such as ink, toner, etc., is controllably introduced into the propellant stream and imparted with sufficient kinetic energy thereby to be made incident upon a substrate....http://www.google.fr/patents/US6416156?utm_source=gb-gplus-shareBrevet US6416156 - Kinetic fusing of a marking material
