CAFC Vacates Summary Judgment Ruling in Third ParkerVision Appeal for Improper Collateral Estoppel Analysis

On Friday, September 5, the U.S. Court of Appeals for the Federal Circuit (CAFC) issued a precedential decision in ParkerVision, Inc. v. Qualcomm Inc. in a more than decade-long infringement battle over patent claims covering the conversion of electromagnetic signals. The Federal Circuit found that the Middle District of Florida erred in its application of collateral estoppel and abused its discretion in excluding expert testimony on validity offered by ParkerVision as unreliable, leading the appellate court to vacate the district court’s summary judgment ruling and remand for further proceedings.

After ParkerVision filed suit against Qualcomm back in 2011, the district court overturned the jury’s infringement verdict by granting judgment as a matter of law (JMOL) of non-infringement to Qualcomm. The Federal Circuit affirmed the ruling, agreeing with the district court that ParkerVision’s expert witness on infringement offered conflicting testimony. ParkerVision sued Qualcomm again on related patents in 2014, and after Qualcomm challenged the validity of patent claims from that suit through inter partes review (IPR) proceedings at the Patent Trial and Appeal Board (PTAB), the Federal Circuit affirmed the PTAB’s findings that ParkerVision’s apparatus claims were invalid while ParkerVision’s method claims were not unpatentable.

Following the second Federal Circuit decision, the district court litigating ParkerVision’s second infringement suit granted a Daubert motion filed by Qualcomm to exclude expert testimony from ParkerVision. The grounds for that exclusion included collateral estoppel from the Federal Circuit’s PTAB affirmance, preventing ParkerVision from contradicting the Board’s validity findings, and unreliable basis as ParkerVision’s infringement expert did not conduct testing and simulation. Finding that Qualcomm’s expert testimony on non-infringement was unrebutted because of ParkerVision’s excluded testimony, the district court also granted Qualcomm’s summary judgment motion of non-infringement.

No Generating Limitation in 2014 Claims Creates Material Difference with 2011 Action

In this latest appellate decision, the Federal Court noted that the parties’ dispute on collateral estoppel centered on whether ParkerVision’s receiver claims in the 2014 suit, which cover the down-conversion of transmitted signals after they are received, were materially identical to the claims from the 2011 suit that led to non-infringement, which taught the down-conversion of signals at or after the circuit’s capacitor. While this issue was correctly identified by the district court, the district court did not undertake claim construction or consider intrinsic evidence from the claims themselves.

The district court erred in applying collateral estoppel by exclusively considering expert testimony without conducting claim construction, the Federal Circuit found. Under Phillips v. AWH Corp. (2005), the intrinsic evidence of the patent claims is more significant than extrinsic evidence like expert testimony, and here the district court completely ignored claim construction. Qualcomm had argued that ParkerVision invited this error by not requesting claim construction, but the Federal Circuit noted that Qualcomm, the party moving for summary judgment, had the burden of proving that the issues litigated in the 2011 action and the 2014 action were identical.

The district court also erred in determining that Qualcomm’s expert testimony was unrebutted such that there was no material difference in the asserted patent claims, the Federal Circuit held. While ParkerVision’s infringement expert did not directly compare the 2011 action and 2014 action through claim charts, the appellate court noted that expert testimony from the 2014 action identified the down-conversion occurring at a point in the circuit prior to the capacitor. While the accused products in the 2011 action and the 2014 action were identical, patent claims asserted in ParkerVision’s earlier action included a generating limitation requiring down-conversion at or after the capacitor.

Different Evidentiary Burdens Means No Estoppel Effect on Related Patent Claims

The Federal Circuit also found error in the district court’s decision to preclude ParkerVision’s expert testimony on validity. While Qualcomm contended that no final judgment on validity existed, precluding appellate jurisdiction on the issue, the Federal Circuit noted that vacating summary judgment of non-infringement made it a matter of judicial economy to inform the district court on the propriety of its exclusion of an issue that would be litigated on remand.

In this ruling, the Federal Circuit clarified that findings underlying unpatentability decisions in IPR proceedings do not collaterally estop patentees from arguing the validity of separate but related claims in district court litigation. The appellate court noted that Qualcomm has not met the clear and convincing evidence burden required in district court as IPR petitioners challenging validity only need show invalidity by a preponderance of the evidence. While the Federal Circuit’s affirmance of invalidity findings by the PTAB create collateral estoppel, the appellate court here affirmed the PTAB’s finding that ParkerVision’s method claims were not unpatentable.

Finally, the Federal Circuit found that the district court abused its discretion in granting Qualcomm’s Daubert motion alleging that ParkerVision’s expert opinions had an unreliable basis. Citing to its decision in Monsanto Co. v. David (2008), the Federal Circuit noted that Federal Rule of Evidence 703 does not require an expert to have personal perception of the basis for an expert opinion in order for that opinion to be based on good grounds. While scientific literature reviewed by the district court indicated that accurate predictions of detailed circuit behavior require simulation, Qualcomm’s experts conceded that the schematics and technical documents reviewed by ParkerVision’s experts would allow evaluation of circuit operation to understand how the accused products work without simulation.

The Federal Circuit concluded this ruling by vacating the district court’s summary judgment of non-infringement and reversing its grant of Qualcomm’s Daubert motion on ParkerVision’s infringement and validity experts. The case was remanded for further proceedings consistent with the appellate court’s opinion.

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Author billperry