WSOU Investments LLC (Brazos) v. F5, Inc., decided April 17, 2025

This Federal Circuit opinion addresses an appeal by WSOU Investments LLC (Brazos) against F5, Inc. regarding a patent for network traffic distribution. The dispute centered on the interpretation of the term "master device" within the patent claims. The district court had adopted Brazos's proposed construction during claim construction but later granted summary judgment of noninfringement to F5. Brazos appealed this decision, arguing for a new interpretation of "master device" that differed from its earlier stance. The Federal Circuit found that Brazos had forfeited this new argument by not presenting it to the district court. Consequently, the appellate court affirmed the district court's summary judgment, holding Brazos to its previously advocated claim construction.