And while we understand that “[t]he obviousness analysis cannot be confined by a formalistic conception of the words teaching, suggestion, and motivation,” we also recognize that we cannot allow hindsight bias to be the thread that stitches together prior art patches into something that is the claimed invention.
Metalcraft of Mayville, Inc. v. The Toro Co., 848 F.3d 1358 (Fed. Cir. 2017).