Phelps Dunbar

Phelps Dunbar LLP is a full-service regional law firm with a significant footprint across the Gulf South of the United States and an office in London. Headquartered in New Orleans, Louisiana, the firm operates with 17 offices and over 430 lawyers, earning its position as an AmLaw 200 firm. The firm's comprehensive litigation capabilities extend across various areas, including intellectual property.

The firm's Intellectual Property practice focuses on advising clients in all aspects of IP law, including patents, trademarks, copyrights, and trade secrets. Phelps Dunbar attorneys handle both the prosecution of patents before the United States Patent and Trademark Office and the enforcement of intellectual property rights through litigation. Their patent litigation experience spans diverse technology areas such as chemical processes, industrial tools and devices, manufacturing methods, communications systems, and software-assisted technologies. For instance, the firm represents clients in patent disputes related to fields like oilfield chemicals, medical devices, marine engines, and software-based systems.

Phelps Dunbar's litigation team demonstrates experience representing both plaintiffs and defendants in intellectual property infringement claims. In the firm's tracked patent litigation, Phelps Dunbar has appeared as lead counsel for the plaintiff, Clean Chemistry, Inc. In one such matter, Clean Chemistry, Inc. v. Enviro Tech Chemical Services, Inc., the firm is representing Clean Chemistry, Inc. as the plaintiff in a case involving peracetic acid technology, where a motion to dismiss for failure to state a claim was denied, and a Markman hearing was held in October 2025.

The firm also maintains an active practice before the Patent Trial and Appeal Board (PTAB). Notably, Phelps Dunbar represents Clean Chemistry, Inc. as a petitioner in an inter partes review (IPR2025-01458) against Enviro Tech Chemical Services, Inc., challenging U.S. Patent No. 9,737,072. Key partners in the firm's patent litigation practice include R. Andrew "Drew" Patty II, who has extensive experience in patents, trademarks, copyrights, and domain name dispute resolution and appears before the PTAB. Chambers USA recognizes Drew Patty for his strong patent practice, and Warner J. Delaune, another registered patent attorney, also handles post-grant proceedings before the PTAB.