The Federal Circuit has overruled an obviousness-type double patenting (ODP) rejection of a parent patent based on the 'In re Cellect' case. This decision preserves the patent term adjustment (PTA) for the patent family patriarch, marking a significant development in patent law. The ruling carves out the first exception to the increasing challenges of double patenting, potentially impacting how future cases are handled. Legal experts, including those from DLA Piper, have analyzed the implications of this decision and a proposed rule that could further affect double patenting.