The present appeal arises from an inter partes review (“IPR”) involving Zhongshan Broad Ocean Motor Co. Ltd., Broad Ocean Motor LLC, and Broad Ocean Technologies, LLC (collectively “Broad Ocean”) and Nidec Motor Corp. (“Nidec”). Broad Ocean petitioned for IPR of claim 21 of Nidec’s U.S. Patent No. 7,208,895 (the “’895 patent”). The Patent Trial and Appeal Board (the “Board”) instituted the IPR and found that claim 21 was anticipated by U.S. Patent No. 5,569,995 (“Kusaka”). Nidec appeals that decision to our court. Because the Board’s decision is not supported by substantial evidence, we reverse.