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Determining what the claims of a patent mean, i.e., claim construction, is largely considered the single most important issue in any patent case. It impacts virtually every claim or defense in a patent infringement lawsuit and in many instances drives disposition of a case. On Sept. 13, 2013, the Court of Appeals for the Federal Circuit sat en banc in Lighting Ballast Control LLC v. Philips Electronics North America Corporation and Universal Lighting Technologies, Inc. to address the standard of review to be applied to a district court’s claim construction ruling. This was only the fourth time in 20 years that the Federal Circuit had sat en banc to address the contours of the claim construction process. In particular, in Lighting Ballast, the Federal Circuit asked the parties to address the following questions: