A recent decision by the U.S. Court of Appeals for the Federal Circuit regarding the scope of estoppel triggered by an inter partes review (IPR) proceeding initially prompted panic among patent litigants, as it suggested a far broader scope of estoppel than had been applied under controlling precedent to that point. But a quick-on-its-feet Federal Circuit issued an errata opinion just over two weeks later, correcting certain of its statements regarding IPR estoppel. While the corrected opinion still overrules one prior decision—as was clearly intended based on the Federal Circuit's reasoning—the correction otherwise moved the decision back in line with precedent.