Areas of Practice
  • DePaul University College of Law, J.D., 1986
  • Michigan Technological University, M.S., Chemical Engineering, 1980
  • Loyola University Chicago, B.A., Chemistry, 1978
Bar & Court Admissions
  • Illinois Supreme Court
  • US Court of Appeals, Federal Circuit
  • US District Court, N.D. Illinois, Trial Bar
  • US Patent and Trademark Office

Thomas J. Filarski

115 South LaSalle Street
Suite 3100
Chicago IL 60603
TEL: +1 312 577 1252
FAX: +1 312 577 1370


Thomas J. Filarski is a partner in Steptoe's Chicago office, where he is a member of the Intellectual Property and related litigation groups. Mr. Filarski is acknowledged as a leading trial lawyer particularly in patent, Hatch-Waxman, and International Trade Commission matters.

Intellectual Asset Management (IAM) magazine writes that Mr. Filarski is “particularly adept when it comes to Hatch-Waxman Act and ITC litigation” and is a “superb attorney with topnotch licensing expertise.” One client says, “he has a gift for explaining technology and technological terms in a way that makes them understandable to a judge, a jury, or any decision maker.” Another client refers to Mr. Filarski as “one of those quiet, humble people, but he is very crafty and he instills great confidence.”

He represents prominent companies in the pharmaceutical, medical device, biotech, chemical, electrochemical and mechanical industries.

He is the past president of the Licensing Executives Society (USA and Canada), a professional organization focusing on the development and transfer of technology and intellectual property.  He also serves on the advisory board of the Clean Energy Trust, which connects entrepreneurs, researchers, and early stage companies with the expertise and capital needed to become sustainable businesses.

Mr. Filarski speaks and writes regularly to professional and industry groups in the United States and abroad on patent litigation and intellectual property topics. He authors the chapter "Patent Defenses" in BNA Books' Patent Litigation Strategies Handbook, now in its third edition, and he was featured in the Business Edition of Leading Lawyers Network magazine in January 2009. Mr. Filarski’s professional affiliations also include Richard Linn American Inn of Court, Chicago Bar Association, American Bar Association, American Intellectual Property Law Association, and Federal Circuit Bar Association.

Profiles and Interviews

  • "The Rise In Compulsory Licensing," interview with Intellectual Asset Management magazine, September/October 2012
  • "Tom Filarski: Detail-Oriented Lawyer Thrives on Teamwork," Leading Lawyers Network Magazine, January 2009
  • "The Needle's Edge," interview with Mr. Filarski regarding the Filertek v. Alaris Medical Systems, Inc. case, Corporate Counsel, June 2004

Representative Matters

  • Eli Lilly and Co. v. Sun Pharmaceuticals (S.D. IN., 2013) - Hatch-Waxman patent litigation over the use of pemetrexed, the active ingredient in Alimta®.
  • Allergan, Inc. v. Sandoz Inc. (M.D. N.C., 2011) - Hatch-Waxman patent litigation involving Latisse®, a drug used to grow eyelashes.
  • Allergan, Inc. v. Sandoz Inc., (D. Del., 2010) - Hatch-Waxman patent litigation related to bimatoprost ophthalmic solution.
  • Bone Care Int'l LLC and Genzyme Corp. v. Sandoz Inc., (D. Del., 2009) - Hatch-Waxman patent litigation related to doxercalciferol.
  • Genzyme Corp. v. Sandoz Inc., (D. MD., 2009) - Hatch-Waxman patent litigation related to sevelamer hydrochloride and carbonate.
  • Pfizer Inc., et al. v. Sandoz Inc., (D. Del., 2009) - Hatch-Waxman patent litigation related to pregabalin.
  • Eli Lilly and Co. v. Sandoz Inc., 08-cv-1548 (S.D. IN.., 2008); Eli Lilly and Co. v. Sandoz Inc., 08-cv-6124 (D. N.J., 2008) - Hatch-Waxman patent litigation over the antidepressant Cymbalta® and generic duloxetine.
  • Nycomed GmbH and Wyeth v. Sandoz, Inc., No. I:08-02871 (N.D. Ill., 2008) - Hatch-Waxman patent litigation related to pantoprazole and antitrust claims arising under the Sherman act.
  • Abbott Labs. v. Sandoz Inc., 486 F. Supp. 2d 767 (N.D. Ill. 2007) - Temporary restraining order and preliminary injunction over patents relating to a polymorph of crystalline cefdinir, an antibiotic also sold as Omnicef®.
  • Filtertek Inc. v. Medex Inc. & Alaris Medical Systems, 01C50084 (N.D. Ill); Alaris Medical Systems, Inc. v. Filtertek Inc., 00 CV 2402 (S.D. Ca.) - Patent litigation on a needle-free connector for intravenous set.
  • EAC v. City of Chicago, O1C6028 (N.D. Ill.)  - Patent litigation asserted against the city's Blue Bag recycling program.
  • McKeown v. City of Chicago, 01-1200 (Fed. Cir.)  - Appeal by McKeown of dismissal of Illinois patent infringement action over the Wacker Drive reconstruction project.
  • McKeown v. City of Chicago, OOC4840 (N.D. Ill.)  - Defending litigation against City of Chicago for infringement related to the Wacker Drive reconstruction project.
  • UFS Corporation v. Walker, et al., 2:98CV-563JM (N.D. Ind.)  - Patent infringement action over membrane electrodes used in electrocoating.
  • Boss v. Cabilly, No. 2009-1264 (Fed. Cir. 2009) (Interference No. 105,531) - Defending appeal taken against Genentech’s “Cabilly” patent application amended priority over UCB Pharma’s “Boss” patent application covering recombinant DNA techniques for manufacturing antibodies.
  • In re Certain Automated Mechanical Transmission Systems for Medium-Duty and Heavy-Duty Trucks and Components Thereof (2004), USITC Inv. No. 337-TA-503 - Successfully defended ZF Friedrichshafen AG and Arvin Meritor Corp. in a consolidated enforcement and advisory opinion proceeding related to a design-around truck transmission system. 
  • In re Certain Automated Mechanical Transmission Systems for Medium-Duty and Heavy-Duty Trucks and Components Thereof (2004), USITC Inv. No. 337-TA-503 - Represented ZF Friedrichshafen AG and Arvin Meritor Corp. in a temporary exclusion order proceeding. After a ten-day hearing involving six patents, ALJ Luckern ruled for our clients on five patents and all but one claim of the sixth patent. Our clients attained favorable results by designing around the one remaining claim and gaining approval to import the redesigned system. 
  • In re Certain Electrical Connectors and Products Containing Same (1995), USITC Inv. No. 337-TA-374 - Temporary exclusion order requested by AMP to stop importation by three parties of single in-line memory module connectors (SIMM) because of patent infringement. Primarily responsible for proceedings against respondents Hon-Hai and Foxconn. After a 12-day hearing, ALJ Luckern issued a recommendation to permanently enjoin Hon-Hai and Foxconn from importing infringing connectors. The remaining respondents settled, agreeing not to import the connectors.

For a full list of Tom's matters please click here.


  • Named in Managing Intellectual Property's "IP Stars" in IL, 2013-2014
  • Selected as a "Life Science Star" in LMG Life Sciences, 2012, 2014
  • Ranked, IAM Patent 1000, Litigation:  Illinois, 2012-2014
  • Highly Recommended, IAM Patent 1000, Transactions:  Illinois, 2012-2014
  • Listed in The Best Lawyers in America 2010-2015 for Patent Law
  • Highly Recommended,IAM 250 - The World's Leading Patent & Technology Licensing Lawyers, 2011-2012
  • Listed in IAM 250 - The World's Leading Patent & Technology Licensing Lawyers, Life Sciences, 2011-2012
  • Ranked, IAM Patent Litigation 250 - The World's Leading Patent Litigators, 2011 
  • Ranked, IAM Life Sciences 250 - The World's Leading Life Sciences Patent Litigators, 2010
  • Listed in Illinois Super Lawyers for Intellectual Property Litigation, 2005-2015
  • Leading Intellectual Property and Patent Lawyer, Leading Lawyers Network, Law Bulletin Publishing Company, 2004, 2005, 2007, 2009, 2010, 2014

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