The Federal Circuit clarified that findings of unpatentability in IPR proceedings do not prevent patentees from contesting the validity of related claims in district court.
The Federal Circuit found the Middle District of Florida erred in applying collateral estoppel, leading to the vacating and remanding of the district court's judgment.
After ParkerVision's initial infringement case, the court overturned a jury verdict in favor of ParkerVision, leading to a complex legal battle over related patents.
This decision underscores the importance of expert testimony in district court and the limitations imposed by IPR findings on related patent claims.
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