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Calypso Wireless filed a patent-infringement lawsuit against T-Mo...

Calypso Wireless filed a patent-infringement lawsuit against T-Mobile USA Friday in U.S. District Court in Marshall, Texas, court filings said. It accused the carrier of infringing its patent allowing switching between GSM and Wi-Fi services. Calypso seeks past and…

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future damages from T-Mobile, along with attorney’s fees and an injunction preventing T-Mobile from selling or manufacturing the inventions embodied in the patent. The lawsuit represents a turning point for Calypso, which expects hundreds of millions of dollars in licensing opportunities, President Richard Pattin said. A T-Mobile spokeswoman said a preliminary review indicates that the allegations lack merit, and the carrier intends to defend itself “vigorously.”