Schrader Companion Duff & Law

Schrader Companion Duff & Law, PLLC, is a regional law firm established in 1925, headquartered in Wheeling, West Virginia. With a team of six attorneys, the firm primarily serves clients across West Virginia and Eastern Ohio. While offering a broad range of legal services including labor and employment, real estate, and estate planning, Schrader Companion Duff & Law is recognized for its litigation practice, earning a Tier 2 or 3 ranking in Litigation – Labor and Employment in Morgantown, West Virginia, by Best Law Firms.

Within its diverse litigation offerings, the firm provides local counsel services for patent litigation matters. Their experience in this area is exemplified by their role as local counsel for defendant Celltrion, Inc. in the significant pharmaceutical biosimilar patent dispute, Regeneron Pharmaceuticals, Inc. v. Celltrion, Inc. This case involved claims of infringement across 25 to 38 U.S. patents related to Regeneron’s EYLEA® (aflibercept) product.

In the Regeneron v. Celltrion litigation, which took place in the U.S. District Court for the Northern District of West Virginia, Schrader Companion Duff & Law represented the defendant side. The dispute concluded in October 2025 with a joint stipulation to dismiss all claims without prejudice, a resolution that permitted Celltrion to launch its biosimilar product in the U.S. on December 31, 2026. The firm’s patent litigation involvement, as tracked, has predominantly been in a defensive local counsel capacity for operating companies. The firm's website does not indicate a specific and notable practice before the Patent Trial and Appeal Board (PTAB) or a significant volume of Inter Partes Review (IPR) filings.

A key attorney in the firm's litigation practice, with an identified focus on patent litigation as local counsel, is Sandra K. Law. Ms. Law, a member of the firm, is admitted to practice in West Virginia and Pennsylvania, as well as before the U.S. Courts of Appeals for the Third and Fourth Circuits and various U.S. District Courts.