Areas of Practice
  • Chicago-Kent College of Law, J.D., with high honors, Order of the Coif
  • University of Illinois at Chicago, M.S., Mechanical Engineering
  • University of Illinois at Chicago, B.S., Mechanical Engineering
Bar & Court Admissions
  • Illinois
  • US Supreme Court
  • Northern District of Illinois Trial Bar
  • US District Court, Northern District of Illinois
  • US District Court, District of Colorado
  • US District Court, Eastern District of Michigan
  • US District Court, Eastern District of Texas
  • US Court of Appeals for the Federal Circuit
  • US Patent and Trademark Office

Daniel S. Stringfield

115 South LaSalle Street
Suite 3100
Chicago IL 60603
TEL: +1 312 577 1267
FAX: +1 312 577 1370

Dan Stringfield is an advocate and trusted adviser for companies facing intellectual property and technology issues. Mr. Stringfield leverages his engineering, consulting, and legal backgrounds to provide his clients with nuanced and contextualized business and technology advice. Clients rely on Mr. Stringfield when developing novel products or entering new markets in IP-intensive areas, acquiring IP assets, monetizing an existing IP portfolio and, when disputes arise, resolving them in an expeditious and cost-effective manner. 

Mr. Stringfield has litigated patent disputes before the Patent Trial and Appeals Board (PTAB), in the International Trade Commission, and in district courts across the country. In his appellate practice, Mr. Stringfield has served as counsel of record in patent cases before the US Supreme Court and the US Court of Appeals for the Federal Circuit (CAFC). Mr. Stringfield also litigates civil cases as special co-counsel with the Cook County State’s Attorney’s Office.

In his pro bono practice, Mr. Stringfield coordinates Steptoe’s involvement with the Chicago-based Domestic Violence Legal Clinic. Mr. Stringfield and other Steptoe lawyers represent victims of domestic violence in obtaining civil orders of protection against their abusers.

Representative Matters

  • Representing defense contractor, Raytheon, in monetizing its vast IP portfolio via multiple matters pending in the PTAB, district courts, and the CAFC.
  • Representing electrical and networking infrastructure manufacturer, Panduit, in defending infringement allegations related to fiber optic networking technology in multiple PTAB and district court matters.
  • Serving as special co-counsel with the Cook County State’s Attorney’s Office defending multiple former-county employees in a False Claims Act case related to the multi-million dollar “Project Shield” program for the provision of high-tech video surveillance to emergency first-responders.
  • Served as counsel of record representing Licensing Executives Society (USA and Canada), Inc. as amicus curiae in multiple precedent-setting patent cases before the Supreme Court and the CAFC.
  • Represented market-leading pharmacy chain, Walgreens, in multiple patent infringement lawsuits, including a suit against rival CVS Caremark Corp. related to smartphone-based prescription refill technology.


  • Illinois Super Lawyers, "Rising Star" in Intellectual Property Litigation, 2016-2017
  • Martindale-Hubbell “Preeminent AV” Rating

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Professional Affiliations

  • Licensing Executives Society (USA and Canada), Inc.