By Andrew Chung NEW YORK (Reuters) - A U.S. appeals court on Friday upheld a lower court's decision to clear Qualcomm Inc in a patent lawsuit by wireless chip developer ParkerVision Inc, allowing it to escape a $173 million verdict for infringement. The U.S. Court of Appeals for the Federal Circuit in the District of Columbia also ruled that nearly all of the patents ParkerVision used to sue Qualcomm are invalid. ParkerVision shares were down 26 percent to 34 cents on the Nasdaq.



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