Michalski Hüttermann & Partner With more than 20 Patent Attorneys and technical experts, Michalski · Hüttermann & Partner Patent Attorneys are among the major private patent law practices in Düsseldorf and the Rhine/Ruhr region. We represent our domestic and international clients in all fields of intellectual property, particularly in the prosecution and enforcement of intellectual property rights, both nationally and internationally. Our attorneys have considerable expertise in FTO opinions, patent oppositions, invalidity actions and infringement actions.