William J. Lenz

T: (312) 269-5376
F: (312) 750-6516

William J. Lenz represents clients in a wide variety of intellectual property matters, with an emphasis on patent and copyright litigation, strategic planning and clearance, patent prosecution and portfolio management, technology transfer and licensing, and corporate IP transactions.  He represents clients across a broad spectrum of industries and technologies, with an emphasis in financial, information technology/data, software, digital and mobile user experience, telecommunications, health care, and consumer electronics sectors.

Bill provides his legal services with a solid understanding and appreciation of the perspectives of in-house counsel, management and technical staff. Prior to his law firm practice, Bill worked for a major electronics corporation in the areas of telecommunications, consumer electronics, and automotive and industrial electronics.

Bill helps his clients navigate competitive markets and develop strategic plans to leverage intellectual property in meeting its business objectives. Bill’s portfolio management and licensing practices fully integrate these strategic plans to give his clients more meaningful, targeted and cost effective intellectual property. Bill has managed numerous successful technology licensing and enforcement campaigns for his clients.

Bill never loses sight of the “big picture” in counseling clients in intellectual property. His style blends intelligent legal analysis of intellectual property issues with a sensible, holistic business-oriented approach, which typically leads to more pragmatic and cost effective solutions for the client.  This is especially the case in litigation matters.  Bill’s litigation practice is synergistic with his transactional practice, which provides more creative, efficient, and cost-effective litigation and transactional results and solutions. Bill’s thorough understanding of patent litigation translates into obtaining effective patents that fit his clients’ strategic plans.

Bill has successfully represented numerous clients in litigation matters, from both the enforcement and defense perspectives. In enforcement efforts, Bill has helped clients leverage their intellectual property to reap significant value, including permanent injunctions against key competitors and significant damage recoveries. In defense efforts, he has successfully navigated around infringement charges and saved his clients from multimillion-dollar damage awards. He has been to trial numerous times, including both successful defenses and enforcements in multimillion-dollar cases.

At the appellate level, Bill has handled numerous appeals involving patent infringement before the Court of Appeals for the Federal Circuit. Bill’s litigation experience extends to various administrative proceedings, including trademark cancellation and opposition proceedings before the Trademark Trial and Appeal Board, post-grant review proceedings and appeals before the Patent Trial and Appeal Board, and FTC and ITC proceedings.

Bill is recognized as a leader in client services in the BTI Client Services All-Stars 2015 guide. He has also been selected by his peers for inclusion in the 2017 edition of Illinois Super Lawyers.


  • John Marshall Law School, The (Chicago) (J.D., 1999), cum laude
  • University of Illinois at Chicago (B.S., 1992)

Bar Admissions

  • Illinois
  • U.S. Patent and Trademark Office

Court Admissions

  • Supreme Court of Illinois
  • U.S. District Court for the Northern District of Illinois
  • U.S. District Court for the Northern District of Illinois (Trial Bar)
  • U.S. District Court for the Eastern District of Wisconsin
  • U.S. District Court for the Eastern District of Texas
  • U.S. Court of Appeals for the Seventh Circuit
  • U.S. Court of Appeals for the Federal Circuit

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