Microsoft's Android legal steamroller may just have hit a speed bump, in the form of a challenge over the validity of its patents by Barnes & Noble. Where other makers of Android devices have rolled over and agreed to pay Microsoft licensing fees, Barnes & Noble is fighting back -- and Microsoft may have met its match.
Microsoft sued Barnes & Noble in March for patent infringement in the Android-based Barnes & Noble Nook and Nook Color. Now Barnes & Noble has filed a Supplemental Notice of Prior Art. In the U.S. patent system, if an invention has been described in prior art, a patent on that invention is not valid. In all, Barnes & Noble lists more than 100 examples of prior art.
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