A game of three-dimensional speed chess. That’s how two Paul, Hastings LLP attorneys described the challenge they faced defending a brand-name drug company in patent litigation in front of the U.S. Patent and Trademark Office’s Patent Trial and Appeal Board. The decision in favor of Supernus Pharmaceutical Inc., handed down Dec. 9, gave Paul, Hastings the first successful defense of a pharmaceutical patent in an inter partes review proceeding in front of the board. Conducting oral arguments for Paul …