Steven E. Feldman

200 West Madison Street
Suite 2700
Chicago, Illinois 60606

Primary Practices

Steven E. Feldman is the head of Hahn Loeser’s Intellectual Property Practice Area and the Partner-in-Charge of the firm’s Chicago office. He focuses his practice on complex intellectual property litigation, prosecution and counseling involving patents, trade secrets, trademarks and unfair competition, copyrights and associated licensing and due diligence, both domestically and internationally. A seasoned trial lawyer and patent attorney, Steve has taken a lead role in trials, Markman hearings and appeals. Steve also regularly supports clients on corporate transactions and due diligence and helps clients to build and manage strategic patent and trademark portfolios worldwide.

A licensed patent attorney with a background in materials science and engineering, Steve’s practice encompasses litigating, prosecuting and licensing matters across a wide variety of pharmaceutical, medical, chemical and materials related technologies. These technologies include steel, aluminum alloys with nano-particulate additives, NiCoCrALY based coatings and superalloys, heat treatments, rare earth magnets, and polymer materials and additives; printing and color pigments, color management software, and hardware high brightness LEDs and other lighting technologies; semiconductor lasers; automotive and aerospace parts and systems; receivers and transmission devices, computer hard-disk drives and brushless direct current motors, computer source code and call center/e-commerce technology; alternative energy technologies including clean coal, biofuels, ethanol processing and solar cells; and medical diagnostic and analytical devices.

Steve has extensive experience litigating chemical and pharmaceutical cases at the trial and appellate levels, including cases involving Hatch-Waxman patent infringement litigation pertaining to prescription pharmaceuticals. He has taken a lead role in cases involving a number of major drugs, including invalidating patents relating to Norvasc, Boniva and Actonel. Other cases of note include the drugs Floxin Otic (which resulted in a $5 million award to a generic client), Actonel®, Antara®, Aripiprazole OLSO®, Boniva®, Uroxatral®, Eloxatin®, Ultracet®, Omnaris®, Benicar®, Lotrel®, Zometa®, Reclast®, Treanda® and Plavix.

In addition, Steve provides strategic counseling regarding Food and Drug Administration marketing exclusivities arising out of Abbreviated New Drug Application (ANDA) patent infringement litigation and has litigated such matters in the U.S. District Court, District of Columbia, and the U.S. Court of Appeals, District of Columbia Circuit. He has overseen large-scale patent licensing programs in the pharmaceutical and biotechnology areas and has experience with related FTC and antitrust issues arising out of pharmaceutical settlements.

Steve also regularly advises medical and analytic instrument manufacturers, research medical centers, certification boards and doctors concerning a variety of intellectual property issues, and has served on the faculty of the American Congress of Neurological Surgeons (2009-10). Steve’s experience encompasses a wide range of medical and diagnostic device technologies, including cancer and other diagnostic assays, surgical tools, dialysis machines, radio frequency (RF) steering mechanisms and locating systems, surgical robots, MRI, CAT scan and PET imaging devices, ultrasonic imaging systems, healthcare management tools, and dental implants and devices.

Steve’s practice also includes representing clients in matters involving the protection and enforcement of trade secrets. He has assisted clients in implementing trade secrets audit and protection programs, negotiating joint venture agreements and preparing effective confidentiality/nondisclosure arrangements.

A nationally recognized leader in intellectual property matters, Steve is a frequent lecturer and is also a member of the George Washington University Intellectual Property Advisory Board and the Northwestern University Institute for Sustainable Energy Executive Counsel.

Professional History

  • Partner, Hahn Loeser & Parks, 2015-present
  • Partner, Husch Blackwell LLP, 2008-15
  • Partner, Welsh & Katz, Ltd., 2001-08



George Washington University Law School, J.D., with honors, 1995


Northwestern University, B.S., Materials Science and Engineering, 1992

Awards & Distinctions

Illinois Super Lawyers, Intellectual Property, 2020-22


IP Star, Managing IP, 2014

Bar Admissions

State of Illinois, 1995


District of Colorado, 2021


U.S. Supreme Court, 2007


U.S. Courts of Appeals for the District of Columbia Circuit, 2007 and the Federal Circuit, 1997


U.S. Patent and Trademark Office, 1995


U.S. District Courts for the Northern District of Illinois (Trial Bar), 2005, Eastern District of Wisconsin, 1997, Northern District of Illinois, 1995

Memberships & Affiliations

American Bar Association, Member


American Intellectual Property Bar Association, Member


George Washington University Law School Intellectual Property, Member, Advisory Board


Intellectual Property Law Association of Chicago, Member


Licensing Executives Society, Member


Northwestern University Institute for Sustainability and Energy, Member, Executive Counsel