“Show us your work” is basically the message the U.S. Court of Appeals for the Federal Circuit sent to the Patent Trial and Appeal Board (PTAB) when it vacated a decision by the board in an ex parte review of rejected patent claims submitted by Theripion Inc. While the Aug. 10 Federal Circuit opinion that remanded the case is nonprecedential, the appellate court made it clear that the PTAB must explain its reasoning for whatever conclusions it reaches.