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This practical guide to patent law is written in a clear and concise style, and covers the practical aspects of litigation in defence of patents, as well as explaining some of the underlying concepts. The book has been substantially revised and updated since the last edition. Information of acquiring, keeping and losing patents, as well as infringement law and proceedings are all discussed in depth. In addition, thorny issues such as the intention of an employee, or patents spanning an international market are dealt with, providing practitioners with an efficient and comprehensive guide to patent law. * Includes excerpts from the Copyright, Designs and Patents Act 1988 for easy reference * Discusses a wide range of topics related to patents.