FRIEDMAN, Circuit Judge.
This is an appeal from a judgment of the United States District Court for the Northern District of Iowa after a jury trial in a patent infringement case. The jury, in response to special interrogatories, found that each of the five patents in issue was either invalid, unenforceable, or not infringed. The trial court entered judgment on that verdict. We affirm most of the judgment, but vacate one portion of it as moot.
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