Microsoft filed a lawsuit in a U.S. District Court in San Francisco last week, asking a judge to invalidate several patents that are the subject of infringement suits filed by WebXchange against three large companies over their use of Microsoft's Visual Studio development tools. The software vendor seeks to invalidate patents used to sue Allstate, Dell and FedEx.
Microsoft said in its lawsuit against WebXchange that the claims against Allstate Insurance Corp., Dell and FedEx relate to their use of Visual Studio. Microsoft added that by asking the court in San Francisco to declare WebXchange's patents invalid, it hopes to defend the three sued customers and spare other Visual Studio users from similar legal actions.
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