Addressing whether a party can waive a challenge to the constitutionality of Administrative Patent Judges’ (APJs’) appointment, the US Court of Appeals for the Federal Circuit found that the issue is non-jurisdictional and therefore waivable. Ciena Corp. v. Oyster Optics, LLC, Case No. 19-2117 (Fed. Cir. Jan. 28, 2020) (O’Malley, J.) (reissued as precedential May 5, 2020).