Posts Tagged: assignor estoppel


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. …
By J. Derek Mason
1 year ago 2

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 …
By Steve Brachmann
2 years ago 0

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 …
By Jason Williams
7 years ago 0