Stylwan IP Holding, LLC v. Stress Engineering Services, Inc., decided May 27, 2025

This nonprecedential United States Court of Appeals for the Federal Circuit opinion addresses an appeal from Stylwan IP Holding, LLC against Stress Engineering Services, Inc. following a judgment of noninfringement by the District Court for the Southern District of Texas. The dispute centers on Stylwan's six patents related to non-destructive systems for assessing material integrity, particularly in industrial settings like pipelines. The core issue on appeal involves the district court's construction of certain claim terms, specifically the "program limitations," which Stylwan argued were too narrow by incorporating specific mathematical equations and autonomous functionality described in the patent embodiments. The Federal Circuit affirmed the district court's claim construction, concluding that the patent's intrinsic evidence supports the inclusion of both the autonomous functionality and the specific "identifier equations." Because this claim construction was upheld, the court also affirmed the noninfringement judgment and did not need to address other issues raised, such as Stress Engineering Services' cross-appeal regarding patent eligibility. Case summary: https://www.cafcnewsbriefs.com/post/stylwan-ip-holding-llc-v-stress-engineering-services-inc-decided-may-27-2025