Obviousness is a legal conclusion based on underlying facts, including “the scope and content of the prior art, the differences between the prior art and the claimed invention, the level of ordinary skill in the art, and any relevant secondary considerations.” Allergan, Inc. v. Sandoz, Inc., 726 F.3d 1286, 1290-91 (Fed. Cir. 2013).

Freedman Seating Co. v. Am. Seating Co. , 420 F.3d 1350, 1363 (Fed. Cir. 2005).Allergan, Inc. v. Sandoz Inc. , 726 F.3d 1286, 1290 (Fed. Cir. 2013) (citing Graham v. John Deere Co. , 383 U.S. 1, 17, 86 S.Ct. 684, 15 L.Ed.2d 545 (1966) ).Kennametal, Inc. v. Ingersoll Cutting Tool Co. , 780 F.3d 1376, 1381 (Fed. Cir. 2015).