Katten Muchin Rosenman

Katten Muchin Rosenman LLP is a full-service, "BigLaw" firm of approximately 700 attorneys with its headquarters in Chicago and offices across the United States, as well as in London and Shanghai. The firm ranked 64th in the 2025 Am Law 200 based on its gross revenue. Katten's Intellectual Property practice is recognized by Chambers USA, and its attorneys and practices have received accolades from publications such as Managing Intellectual Property and Best Law Firms.

The firm's patent litigation practice has a significant focus on the pharmaceutical and life sciences sectors, with deep experience in Hatch-Waxman (ANDA) litigation representing generic and biosimilar drug manufacturers. The firm's materials state it represents many of the world's largest generic pharmaceutical companies. While the firm handles both plaintiff and defense work, it has been repeatedly recognized as one of the most active and best-performing firms representing defendants in ANDA litigation. The tracked case, Apotex Inc. v. Soleno Therapeutics Inc., where the firm represents the plaintiff, demonstrates its capacity to act on the offensive side in the pharmaceutical space. The firm also lists experience in areas such as biotechnology, consumer electronics, and financial services.

Katten maintains an active practice before the Patent Trial and Appeal Board (PTAB). Partner Jitendra "Jitty" Malik's experience includes inter partes review (IPR), post-grant review (PGR), and ex-parte reexaminations, particularly for pharmaceutical patents. The firm's strength in this area is highlighted by its recognition in the IPR Intelligence Report as one of the "Top 100 Most Active Law Firms representing Petitioners" in 2022. The firm's appellate group also has a track record of handling patent appeals before the Federal Circuit, including a successful 2020 appeal for a major generic pharmaceutical client that affirmed the invalidation of patents on a multi-billion dollar drug.

Key partners in the patent litigation practice include Jitendra "Jitty" Malik, a Charlotte-based partner with a Ph.D. whose practice is centered on Hatch-Waxman litigation and PTAB proceedings. Sara M. Pistilli, a Chicago associate with a Doctor of Pharmacy degree, also focuses on patent disputes in the chemical and pharmaceutical industries. Deepro R. Mukerjee is the chair of the firm's global Intellectual Property Department and is noted as a leading trial attorney in the patent field, particularly for his work in complex pharmaceutical litigation.