Much of U.S. patent law jurisprudence still revolves around subject matter eligibility, but a new decision by the Court of Appeals for the Federal Circuit revisits the question of what constitutes obviousness in patent applications. The court remanded the case between Irvine, Calif.-based Axonics Inc. and Dublin-based Medtronic plc to the Patent Trial and Appeal Board (PTAB) after determining that the PTAB judge’s understanding of obviousness is “doubly infected by error” in a decision that seems to offer some much-needed clarity where obviousness is concerned.