According to Bloomberg News, 'Research in Motion, which paid $612.5 million to resolve a patent lawsuit in March over its BlackBerry wireless e-mail device, has filed a complaint challenging another company's infringement claims.

Research in Motion based in Waterloo, Ontario, asked a federal court in Dallas to rule that the BlackBerry does not infringe patents owned by the Visto Corporation, a company in Redwood Shores, Calif, that provides e-mail software to cellphone companies. The suit was filed Monday, the first business day after Visto sued Research in Motion in federal court in Marshall, Tex.

The lawsuit will allow Research in Motion, whose United States distributor is based in Irving, Tex, to contest which court will hear the case.

In March, Research In Motion paid $612.5 million to NTP Inc, based in Arlington, Va, to end a five-year patent fight.'

Originally by NYT > Technology, 10:43 AM

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