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, copyright and trademark 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, including financial, information technology/data, healthcare, telecommunications, heavy machinery, consumer and industrial electronics, consumer products, and food packaging.

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 multi-million dollar damage awards. He has been to trial numerous times, including both successful defenses and enforcement in multi-million 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, appeals before the Board of Patent Appeals and Interferences, and FTC and ITC proceedings.

In addition to his degree in mechanical engineering, Bill also completed significant coursework in pursuit of an advanced degree in electrical engineering, particularly while working in the electronics industry.


  • 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