Microsoft Corp. filed a 102-page brief Tuesday with the Federal Circuit U.S. Court of Appeals seeking to overturn a $290 million patent infringement judgment entered earlier this month against the company by Tyler, Texas, federal Judge Leonard Davis. In his ruling, on behalf of a Canadian company called i4i Inc., Davis also entered an injunction against Microsoft — which prevents it from selling certain versions of Microsoft Word — and took Microsoft’s lead counsel, Matt Powers, to task for making “improper arguments” at trial.

In the first line of their preliminary statement, Microsoft’s lawyers — including Powers — take aim at Davis: “In patent cases, even more than most, the trial judge’s role as a gatekeeper is crucial.”

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