A U.S. judge narrowed a patent lawsuit brought by Google's Motorola Mobility unit against Microsoft Corp, finding that parts of three Motorola patents are invalid. The ruling came from U.S. District Judge James Robart in Seattle, who is overseeing a tandem lawsuit in which Microsoft claims Motorola deserves only a small royalty on many of its telecommunications patents. Google bought Motorola for $12.5 billion, partly for its intellectual property stockpile.
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