A Delaware federal judge has released Sharp Electronics Co. and Vizio Inc. from a patent-infringement suit, finding that key evidence was not admissible in the case.

Chief Judge Leonard P. Stark of the U.S. District Court for the District of Delaware last week ruled that plaintiff Wi-LAN Inc. could not rely on source code for allegedly infringing parts that Sharp and Vizio had incorporated into their televisions after years of delay in bringing it forward.

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