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William Flachsbart is a Partner and Chair of the Intellectual Property Litigation Team at Dunlap Bennett & Ludwig. Wil provides counsel regarding a wide array of legal matters to both high-tech companies and individuals, including patent, trade secret, and trademark issues. He assists companies and individuals in preparing to litigate and defend intellectual property claims. Wil also has extensive experience dealing with non-disclosure and non-competition agreements and with assisting companies in assessing complicated intellectual property structures to determine the scope of their assets or exposure, including the... evaluation of patents, trade secrets, and publicly available information.

Wil has a broad base of litigation experience at all stages of trial preparation and trial, from pre-filing investigation and analysis through all of the stages of discovery, trial, and appeal. He has substantial defense experience and has resolved multimillion-dollar claims while representing defendants and plaintiffs alike.

Wil also has significant experience in achieving the resolution of cases short of trial. He has a particular gift for finding win-win solutions and resolving complex disputes between adverse parties in a creative and problem-solving manner. Wil has achieved these results in mediation and outside of litigation, as well as achieving settled outcomes during litigation and prior to trial or during the appeal. He prides himself on finding settlement solutions in what appear to be intractable situations.

Wil is comfortable in a courtroom and cogently and persuasively presents both legal issues and complex technology. One client praises his performance in a courtroom by describing his “commanding presence,” highlighting “his articulate, passionate delivery,” and his combination of “knowledge, strategy, and presentation skills.” Another speaks of Wil’s “impressive skills and tenacious efforts” on his behalf.


  • Primary focus is on commercial litigation, including intellectual property and contract or other business disputes. He has managed individual patent lawsuits, run large-scale licensing campaigns, and has assisted clients with a wide variety of business disputes in either resolving them without resort to the courts or in litigating where such efforts became necessary.
  • Coordinated multiple IP portfolio licensing campaigns for IP portfolios including: a campaign for frequency and protocol agile wireless and cellular devices, which included filing multiple lawsuits in the Eastern District of Virginia on behalf of one of the inventors and his company; a campaign relating to leveraging mobile devices for mapping of branded locations which included multiple lawsuits in the Northern District of Illinois, and a wide range of additional lawsuits filed in federal courts across the country.
  • Argued and won a white-collar criminal sentencing appeal in United States v. Pu, 814 F.3d 818 (7th Cir. 2016).
  • Worked with Robert Greenspoon in successfully appealing a finding of inequitable conduct in 1st Media v. Electronic Arts, et. al., 694 F.3d 1367 (Fed. Cir. 2010), and has worked with Mr. Greenspoon on a wide variety of successful appeals to the Federal Circuit and other federal appellate courts.
  • Worked with Michael La Porte represented an inmate in an Eighth Amendment case on a pro bono basis and won a jury trial in Curry v. Weathersby, 11-CV-5590 (N.D. Illinois), in which the jury found that the defendant prison guard had violated the inmates civil rights and awarded punitive damages.
  • Represented a doctor who was sued by another doctor under trademark law as a result of the similarity in their names in Joshi v. Joshi, 18-cv-05426 (N.D. Illinois).
  • Successfully resolved matters without resort to the courts, including multiple non-competition and trade secret disputes, and successfully negotiated the resolution of a breach of contract case based on a significant acquisition offer later reneged on.


  • Award for Excellence in Pro Bono Service, United States District Court for the Northern District of Illinois May 14, 2015
  • Illinois Super Lawyer (Intellectual Property) 2013-2022


  • J.D., Loyola University Chicago School of Law
  • M.S., Mathematics, University of Oregon
  • S.B., Mathematics with a concentration in Computer Science, University of Chicago


  • Illinois
  • U.S. Supreme Court
  • Illinois State Courts
  • U.S. Court of Appeals for the Eighth Circuit
  • U.S. Court of Appeals for the Federal Circuit
  • U.S. Court of Appeals for the Fourth Circuit
  • U.S. Court of Appeals for the Seventh Circuit
  • U.S. District Court for the District of Arizona
  • U.S. District Court for the District of Colorado
  • U.S. District Court for the District of Columbia
  • U.S. District Court for the Eastern District of Tennessee
  • U.S. District Court for the Western District of New York
  • U.S. District Court for the Western District of Texas
  • U.S. District Court for the Western District of Wisconsin

Memberships &

  • ABA, Member

Outside of Work

  • Scuba diving
  • Poker
  • Bicycling

Intern Program

As part of our effort to recruit, develop and retail the best and brightest attorneys, Dunlap Bennett & Ludwig offers a summer intern program for promising law school students who are looking to work as part of an innovative and incredibly successful team. With a global team of lawyers, selected candidates are able to work on high level projects in a collaborative space.

Paralegals and Legal Support Staff

At Dunlap Bennett & Ludwig, our team of paralegals and staff work together collaboratively along side our attorneys toward a common goal. We have created a positive work environment where our paralegals and legal assistants work to successfully reach firm-wide goals and support each other to combine individual strengths to enhance team performance. They regularly assist our attorneys with organizing and maintaining files, conducting legal research, and preparing documents.