HOLOGIC, INC. v. MINERVA SURGICAL, INC.

2019-2054, 2019-2081.

957 F.3d 1256 (2020)

HOLOGIC, INC., Cytyc Surgical Products, LLC, Plaintiffs-Appellants, v. MINERVA SURGICAL, INC., Defendant-Cross-Appellant.

United States Court of Appeals, Federal Circuit.

Decided: April 22, 2020.


Attorney(s) appearing for the Case

Matthew Wolf , Arnold & Porter Kaye Scholer LLP, Washington, DC, argued for plaintiffs-appellants. Also represented by Jennifer Sklenar, Marc A. Cohn.

Robert N. Hochman , Sidley Austin LLP, Chicago, IL, argued for defendant-cross-appellant. Also represented by Jillian Stonecipher, Caroline A. Wong ; Olivia M. Kim , Edward Poplawski, Wilson Sonsini Goodrich & Rosati, Los Angeles, CA; Vera Elson, Palo Alto, CA.

Additional views filed by Circuit Judge Stoll.


These appeals require us to grapple with the doctrine of assignor estoppel, an equitable doctrine that prevents a party who assigned a patent to another from later challenging the validity of the assigned patent in district court. There are two patents-in-suit and each presents a different assignor estoppel issue. For the first...

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