LeapFrog Enterprises Inc., maker of the LeapPad educational toy line, has sued Mattel Inc.’s Fisher-Price Inc., sparking a patent-infringement battle over talking books that are expected to be hot ...
A federal judge declared a mistrial Friday in LeapFrog Enterprises Inc.’s lawsuit seeking $58 million from Mattel Inc.’s Fisher-Price unit over a patent for interactive books that help children learn ...
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