Insights

On November 4, 2025, the USPTO in Ex parte Desjardins designated as precedential an earlier Appeals Review Panel (ARP) decision overruling the Patent Trial and Appeal Board (Board), instead holding that claims directed to training a machine learning model are patent-eligible under 35 U.S.C. § 101 when they integrate a mathematical concept into a practical application that improves how the model operates. That precedential designation represents a material shift in legal precedent in the § 101 arena post-Alice, and it has already driven updates to the MPEP and examiner practice. As a result, Desjardins signals an adjustment in practice in favor of AI and software eligibility at the USPTO.