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Microsoft v. i4i: the Supreme Court affirms that validity challenges must be proved by clear and convincing evidence

USA - June 17 2011 On June 9, 2011, the Supreme Court issued its long-awaited decision in Microsoft Corp. v. i4i Limited Partnership, affirming, 8-0 (Chief Justice Roberts was recused), that a patent challenger must prove a patent's invalidity by clear and convincing evidence.

Andrew D. Barker, Gregory A. Castanias, Susan M. Gerber