Ellen E. Oberwetter

Ellen E. Oberwetter is a patent litigator specializing in life sciences, particularly pharmaceutical and biologics patent disputes. Her practice primarily focuses on Hatch-Waxman and Biologics Price Competition and Innovation Act (BPCIA) litigation, alongside licensing disputes concerning collaboration agreements and royalty obligations. She is a Partner at Williams & Connolly LLP, where her practice also includes complex civil litigation, arbitration, and bankruptcy litigation.

Ms. Oberwetter has consistently represented Regeneron Pharmaceuticals, Inc. in its efforts to enforce patent rights for its blockbuster ophthalmic biologic EYLEA® (aflibercept) against biosimilar developers. She has appeared on the plaintiff side in three of her tracked cases and once on the defendant side, demonstrating a strong plaintiff-side emphasis in her patent litigation work. Her notable engagements include Regeneron's patent infringement litigation against Mylan Pharmaceuticals Inc. et al., Celltrion, Inc., and Sandoz Inc., all concerning aflibercept biosimilars.

In these cases, Ms. Oberwetter has been involved in significant outcomes, including a Federal Circuit affirmance of a preliminary injunction in favor of Regeneron against a six-member biosimilar coalition, including Mylan, protecting EYLEA®'s patent portfolio. She also handled cases against Celltrion and Sandoz, which resulted in settlements allowing biosimilar launches in late 2026, with all U.S. intellectual property litigation being dismissed. While the provided search results do not explicitly detail her individual appearances in IPR/PTAB proceedings, her firm profile indicates a broader patent and licensing disputes practice that would typically involve such considerations.

Ms. Oberwetter earned her J.D., with high honors, from The University of Texas School of Law in 2000, where she was a member of the Order of the Coif and Texas Law Review. She received her B.A. from the University of Michigan in 1997. Following law school, she clerked for Judge Tom Reavley of the U.S. Court of Appeals for the Fifth Circuit and Judge Joe Kendall of the U.S. District Court for the Northern District of Texas. She joined Williams & Connolly in 2002 and is currently a Partner at the firm.