The determination of obviousness is a legal conclusion based on underlying facts. Allergan, Inc. v. Sandoz Inc., 726 F.3d 1286, 1290-91 (Fed. Cir. 2013). After a bench trial, we review the district court's factual findings for clear error and its conclusions of law de novo.
“[T]he person of ordinary skill need only have a reasonable expectation of success of developing the claimed invention.” Allergan, Inc. v. Sandoz Inc., 726 F.3d 1286, 1292 (Fed.Cir.2013) (emphasis added). The ' 029 patent is not limited to compounds with a C1–amide group, such as bimatoprost or the broader class of compounds described in the ' 819 patent.