Source: https://www.pepperlaw.com/publications/sometimes-the-patent-office-has-the-last-and-only-word-2019-02-08/
Timestamp: 2019-04-22 20:48:37+00:00

Document:
Momenta was developing a biosimilar, but withdrew its application when the proposed biosimilar failed Phase I clinical trials. BMS moved to dismiss the appeal on Article III grounds due to the withdrawal. Momenta argued that it had not abandoned the project, and that the BMS patent was still an obstacle and the resulting estoppel would cause an injury to Momenta. The Federal Circuit, however, was not persuaded and dismissed the appeal. The court stated that Momenta’s withdrawal of the biosimilar terminated potentially infringing activity, and that the possibility of estoppel was now irrelevant.
should not impact IPR petitioners who are engaged in patent litigation.
In 2017, in Phigenix, Inc. v. ImmunoGen, Inc., the Federal Circuit7 held that, although an unsuccessful IPR petitioner has a statutory right to appeal, it might not possess the requisite “injury in fact” to have standing to appeal under Article III of the U.S. Constitution. The Federal Circuit explained that an injury in fact that is sufficient for standing must be concrete and particularized” and not “conjectural or hypothetical.”8 In that case, Phigenix argued that the ImmunoGen patent interfered with licensing efforts and could result in an estoppel, but the Federal Circuit found that these concerns did not amount to an injury in fact, and thus the Phigenix appeal was dismissed. The court has now altered the aforementioned balance.
It remains to be determined how the unavailability of judicial review under Article III will impact the application of the estoppel provisions against an unsuccessful IPR petitioner.
1 Momenta Pharmaceuticals, Inc. v. Bristol-Myers Squibb Co., No. 2017-1694 (February 7, 2019).
2 The Board is required to conduct the IPR to secure a “just, speedy, and inexpensive resolution.” 37 C.F.R. § 42.1(b).
3 35 U.S.C. § 311(a).
5 35 U.S.C. §§ 141(c), 319. This procedure stands in contrast to the ex parte reexamination statue, which has no estoppel against a third-party requester and no right of judicial review for the third-party requester. Greenwood v. Seiko Instruments, 8 USPQ2d 1455 (D.D.C. 1988).
6 In the previous and analogous inter partes reexamination proceeding, the Federal Circuit held that estoppel “applies only after all appeal rights are exhausted.” Bettcher Indus., Inc. v. Bunzl USA, Inc., 661 F.3d 629, 648 (Fed. Cir. 2011).
7 Phigenix, Inc. v. ImmunoGen, Inc., 845 F.3d 1168 (Fed. Cir. 2017).

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