The European Patent Office (EPO) has reached a milestone on December 10th 2008 by publishing its two millionth patent application. The application, filed on 7 June 2007 by the Technical University of Denmark (DTU), describes a microbial fuel cell which can be used to produce electricity from wastewater. The EPO received its first application in 1978 and the one millionth application was published in 2000.