Hologic, Inc. v. Minerva Surgical, Inc., No. 19-2054 (Fed. Cir. Apr. 22, 2020)

From the Opinion

The passage below is extracted verbatim from the opening of the document. It has not been editorially summarized — consult the full opinion for the court's complete reasoning.

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 challeng- ing the validity of the assigned patent in district court. There are two patents-in-suit and each presents a different assignor estoppel issue.