In this incisive book, Minyu Zheng examines the various legal responses to unjustified threats of patent infringement. Employing a comparative, jurisdiction-based analysis, Zheng investigates whether the unjustified nature of such threats originates from the inaccuracy of the infringing accusation, or the inappropriateness of issuing threats. In particular, Zheng reveals how to resolve threats which are issued in an undue way but contain a correct allegation of patent infringement.