This thesis analyses the extraterritorial dimension of patent systems in light of recent judicial trends, ending with the United States Supreme Court's landmark 2007 ruling in AT&T v. Microsoft. The discussion examines (i) the economic interest of nations in issuing and maintaining patent rights; (ii) the legal arguments against a unilateral extraterritorial extension of domestic patents, leading to the legal presumption against extraterritorial extension; (iii) the evolution of this doctrine in United States legislation and jurisprudence and forays against it, especially in recent decades; and (iv) the impact of globalization and of the nature of patentable information in the digital age on the issue of the extraterritorial extension of patent rights. The general conclusions are that, in the modern age, patent rights need to be extended beyond the domestic jurisdiction, and that the appropriate manner for nations to achieve this extension is not unilaterally but through bilateral and multilateral treaties.

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