Louis A. Klapp

Partner ( Chicago )

Direct 312.471.8680 Fax 312.471.8701 LinkedIn


Louis Klapp has litigated intellectual property disputes for nearly a decade. He is hardwired for tireless research and meticulous examination, which has driven his success as a litigator. Understanding that many complex cases hinge on subtle and complicated distinctions, he always arrives prepared.

Louis devotes his practice to patent, trademark, and trade secret disputes. He has represented clients across a wide variety of industries, including the software, consumer electronics, wireless communication, telephony, medical device, nutritional supplement, grocery, insurance, publishing, consumer products, retail, and automotive equipment industries. His patent cases have concerned technologies in the software, electrical, mechanical, optical, and biological fields. 

Louis has engaged in all aspects of litigation from pre-filing investigation through appeal. He has litigated cases in many federal district and appellate courts, the United States International Trade Commission, the Patent Trial and Appeal Board, the Trademark Trial and Appeal Board, and the Judicial Panel on Multidistrict Litigation. In addition to his litigation work, he counsels clients on intellectual property issues, and he negotiates resolution of disputes without litigation.

Following law school, Louis was a Public Interest Law Initiative Fellow at the ACLU of Illinois. He maintains a pro bono practice focused on civil liberties and civil rights.


Representative Engagements

  • Represented a fenestration software company against multiple claims of patent infringement and multiple claims of trade secret misappropriation brought by its competitor. After summary judgment was briefed and after multiple CBMs/IPRs had been instituted, obtained settlement of the matter without payment of any compensation.
  • Represented a major healthcare software company against a well-known patent assertion entity. Won a motion to dismiss invalidating key claims as ineligible subject matter. Obtained a zero-dollar settlement ending the remainder of the case.
  • Represented a supplier of library goods against accusations of trademark infringement and counterfeiting. Although plaintiff sought an eight-figure award, it settled for a nuisance payment on the eve of trial after the court acknowledged the merit of client’s motion to strike plaintiff’s damages case.
  • Represented a leading smart-home company in a litigation filed by a competitor, which sought a preliminary injunction. The court denied the motion for preliminary injunction, indicating that “the likelihood of [plaintiff] being able to prove its case seems faint.”
  • Represented a national grocery store chain seeking to cancel a trademark registration owned by a provider of vending machine services. The Trademark Trial and Appeal Board canceled the registration.
  • Represented a manufacturer of smartphones and smart TVs against patent infringement claims brought by a well-known patent assertion entity. Obtained dismissal without payment.
  • Represented a software company against accusations of patent infringement related to the client’s data security practices. Won a motion to dismiss invalidating the patent as subject matter ineligible.
  • Represented an architectural metal supplier in a patent infringement case brought by its competitor.  After winning a motion to dismiss that invalidated most claims, the parties executed a license with terms substantially similar to the terms offered by the client before it was sued.
  • Represented a supplier of telephone hardware seeking to cancel the claims in its competitor’s patent in the Patent Trial and Appeal Board. After the Board initiated inter partes review, the competitor disclaimed its patent.
  • Represented an automotive parts supplier and its customers in litigations filed by a large competitor in the U.S. International Trade Commission and federal district court. The case settled after the pretrial conference on the eve of opening statements.
  • Represented leading telecommunication equipment suppliers in a complex multi-district action brought by a patent assertion entity. The plaintiff alleged that the defendants infringed dozens of patents related to wireless networking. The case settled after a highly favorable court order limited the plaintiff’s potential damages claim.
  • Represented a leading property and casualty insurance company and its affiliates in federal district court. The clients were accused of infringing patents related to online insurance quoting. The case settled before trial.



Northwestern Pritzker School of Law, J.D., 2010, cum laude
Executive Articles Editor, Journal of Criminal Law and Criminology

Princeton University, M.A., Electrical Engineering, 2004
Cornell University, B.S., Materials Science & Engineering, 2002, cum laude with honors

Bar Admissions

U.S. Court of Appeals for the Seventh Circuit
U.S. Court of Appeals for the Federal Circuit
U.S. District Court for the Northern District of Illinois
U.S. District Court for the Western District of Michigan
U.S. District Court for the Northern District of Texas
U.S. District Court for the Eastern District of Texas
U.S. District Court for the Western District of Wisconsin
U.S. Patent and Trademark Office

Professional Memberships

American Bar Association
Intellectual Property Law Association of Chicago
National LGBT Bar Association
American Civil Liberties Union of Illinois
Next Generation Society Executive Committee

Honors & Awards

Chicago’s Notable LGBTQ Executives, Crain’s Chicago Business (2021)
Best LGBT Lawyers Under 40, The LGBT Bar (2017)
Mike Gonring Pro Bono Award (2018)