Patent Judgments Questioned in Appointment Flap

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As many as two-thirds of United States patent-law judges may have have been appointed in a way that violates the Constitution. That's because of a 1999 law that changed how these judges are chosen.

It may mean big headaches for the Justice Department and confusion for patent holders.

The man who discovered the problem, George Washington law professor John Duffy, talks with John Ydstie.

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