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Prosecution history estoppel typically arises when a claim is rejected during prosecution and is then amended (narrowed) to overcome the rejection. However, in Colibri Heart Valve LLC v. Medtronic CoreValve, LLC, No....more
In Kroy IP Holdings, LLC v. Groupon, Inc., 127 F.4th 1376 (Fed. Cir. 2025), the Federal Circuit held that patentees in district court are not collaterally estopped from asserting claims that were not immaterially different...more
Addressing an issue of first impression, the US Court of Appeals for the Second Circuit concluded that two medications that contain the same ingredients but are packaged in different forms constitute separate markets for...more
When thinking about estoppel and the PTAB, the § 315(e) estoppels—relating to grounds a petitioner raised or reasonably could have raised—are likely the first to come to mind. However, other types of estoppel, such as...more
The Federal Circuit recently held, for the first time, that patent owners bear the burden of proof for an Inter Partes Review (“IPR”) Estoppel affirmative defense that an alleged infringer failed to include prior art in a...more
In a recent decision, 25 F.4th 1035 (Fed. Cir. 2022), the Federal Circuit dismissed for lack of jurisdiction an appeal of the PTAB’s decision that estopped a Petitioner from maintaining a third IPR that challenged the same...more
[co-author: Jamie Dohopolski] Last year, the continued global COVID-19 pandemic forced American courts to largely continue the procedures set in place in 2020. The U.S. Court of Appeals for the Federal Circuit was no...more
On March 9, in Uniloc 2017 LLC v. Facebook Inc., the Federal Circuit held that the no-appeal provision of 35 U.S.C. § 314(d) does not preclude appellate review of the PTAB’s estoppel determination under section 315(e)(1) when...more
On August 3, 2018, the U.S. Court of Appeals for the Federal Circuit dismissed an appeal from the USPTO Patent Trial and Appeal Board (PTAB) in JTEKT Corporation v. GKN Automotive Ltd. on the basis that the appellant lacked...more