Posts Tagged: assignor estoppel
Supreme Court Will Review Doctrine of Assignor Estoppel
On Friday, the U.S. Supreme Court granted a petition for certiorari filed by Minerva Surgical, Inc. asking the Court to clarify questions around the doctrine of …
CAFC: Inability to Challenge Claims in District Court is No Impediment to PTAB Challenge
The CAFC explained that the doctrine of assignor estoppel does not bar an assignor from filing a petition for IPR to challenge the validity of the assigned …
Assignor Estoppel and IPRs: Possible Impact of Arista v. Cisco on Employment or Assignment Agreements
The doctrine of assignor estoppel has been around for over a century and most often applied in the U.S. International Trade Commission (ITC) and U.S. …
Federal Circuit says Assignor Estoppel Has “No Place” in IPR Proceedings
The Federal Circuit recently found that assignor estoppel has “no place in IPR proceedings,” affirming a holding of the Patent Trials and Appeal Board (“Board”) that assignor …
Hologic Wins $4.8M in Jury Verdict After Judge Determines Assignor Estoppel BarredPatent Invalidity Defenses
On July 27th, a jury verdict entered in the District of Delaware awarded $4.8 million in lost profit and reasonable royalty damages to Marlboro, MA-based medical technology company …
Mentor Graphics v. Synopsys: Affirmed-in-Part, Reversed-in-Part, Vacated-in-Part, and Remanded
Various Synopsys parties and EVE-USA, Inc. (collectively “Synopsys”) sued Mentor Graphics, seeking a declaration that Mentor’s ’376, ’531, and ’176 patents were invalid and not infringed. Mentor counterclaimed for …
Federal Circuit Affirms District Court on Finding of Assignor Estoppel
The Court affirmed that B/E could not challenge the validity of MAG’s patents, because of assignor estoppel. In this case, MAG acquired the patents by …
Semiconductor Energy Laboratory v. Yujiro Nagata: Assignor Estoppel is Affirmative Defense, No Supplemental Jurisdiction
Semiconductor Energy Laboratory (“SEL”) appealed the decision of the District Court of California that dismissed with prejudice SEL’s complaint versus Yujiro Nagata (“Nagata”) due to a …
