• vcard
D 312.873.3670
F 312.893.2120
  • Education
    • J.D., Cornell University, 1998
    • B.S., Purdue University, 1991
  • Court Admissions
    • U.S. District Court, Northern District of Illinois, 2009
    • U.S. Court of Appeals, Seventh Circuit, 2003

John Leja has a wide range of experience representing corporations and individuals in matters involving intellectual property and complex commercial litigation in courts across the nation. He’s represented clients in preliminary injunction hearings, claim construction, summary judgment, bench trials, and jury trials.

John serves as the vice chairman of the firm’s Intellectual Property Litigation practice. He has counseled numerous companies and major manufacturers concerning patent and copyright litigation, unfair competition, intellectual property licensing, risk management, product liability, consumer transactions, and negotiation strategy. He has been the lead counsel in mediations, arbitrations, and trials in a variety of matters. He was co-counsel before the International Trade Commission in a patent dispute involving adjustable work support systems. He also settled patent disputes involving flexible re-closeable packaging, laminated card stock, and foundry technology.

With respect to commercial matters, John has defended consumer class actions (reward points, early termination charges), construction claims (steel structures, concrete foundations, excavation, etc.) and wrongful franchise termination claims seeking in excess of $1.5 million. He also argued on behalf of his client in the U.S. Court of Appeals for the Seventh Circuit in a matter of first impression involving the adequacy of Truth in Lending Act disclosures.

  • Akoo Intl. v. Harris, et al.
  • Axis International Marketing v. Made Smart, Inc.
  • Benefit Funding System v. CNU Online Holdings, LLC
  • Cooperstown Bears v. Action Performance, et al.
  • DISA Industries v. Thyssen Krupp Waupaca
  • Essociates v. Neverblue Media, Inc.
  • Essociates v. ShareASale,.com Inc.
  • Fellowes Inc. v. Changzhou Xinrui Fellowes
  • Illinois Tool Works Inc. v. Pactiv Corporation, et al.
  • Illinois Tool Works Inc. v Hormel Foods Corp., et al.
  • Illinois Tool Works Inc., d/b/a CFC Int'l. Corp. v. Waytek Ind., Inc.
  • Pliant Corp. v. Illinois Tool Works Inc.
  • Lakshmi Arunachalam v. Enova International, Inc.
  • MapQuest v. Civix, et al.
  • S.C. Johnson & Son, Inc., et al. v. Illinois Tool Works Inc.
  • Trading Technologies, Int'l., Inc. v. Cunningham Trading Sys., LLC.
  • Unified Messaging Systems v. PlentyofFish, Inc.
  • Unified Messaging Systems v. WeeWorld, Inc.
  • Unified Messaging Systems v. WAYN
  • White v. Heinz Company LP