Likelihood of confusion is a question of law with underlying factual inquiries based on the DuPont factors. Stratus Networks, Inc. v. UBTA-UBET Commc's Inc., 955 F.3d 994, 998 (Fed. Cir. 2020). We review the legal question of likelihood of confusion de novo.
We review the Board's factual findings as to each DuPont factor for substantial-evidence support. Id.; see also Stratus Networks, Inc. v. UBTA-UBET Commc'ns Inc., 955 F.3d 994, 998 (Fed. Cir. 2020); In re Chatam Int'l Inc., 380 F.3d 1340, 1342 (Fed. Cir. 2004). A finding is supported by substantial evidence