Patrick J. Kelleher



A dual citizen of the United States and Ireland, Patrick Kelleher represents Asian, European, Canadian and U.S. clients in patent litigation across the United States. He has tried patent cases in Texas, Delaware, California and Illinois and has argued before the United States Court of Appeals for the Federal Circuit numerous times. Patrick also represents and counsels clients in antitrust matters and trademark litigation. He concentrates his work in the electronics, medical device, energy, aeronautics, retail and videogame industries.

Patrick leads teams of our experienced and dedicated professionals to achieve the goals of our clients in and out of the courtroom. He is dedicated to travel the world to meet our clients, learn their businesses and protect their interests.

Patrick served as law clerk to the Hon. Paddy H. McNamara in the Law Division of the Circuit Court of Cook County and worked in the Frauds Bureau of the Office of the District Attorney of New York County (Manhattan).

Representative Experience

  • Obtained summary judgment of non-infringement for a major manufacturer of mobile phones and also Rule 11 sanctions against opposing counsel with an award to our client of attorney fees
  • Argued and won for a major electronics manufacturer a leading Federal Circuit precedent on the preclusive effects of PTAB decisions on other proceedings
  • Obtained affirmance of a non-infringement judgment in favor of his client a mere five days after oral argument before the Federal Circuit
  • Won the reversal of a $20 million antitrust jury verdict
  • Obtained a writ of mandamus to protect a client's attorney-client privilege
  • Obtained many favorable summary judgments, verdicts, and appellate results for clients in more than 25 states — his cases have twice reached the U.S. Supreme Court

Personal Interests

Patrick lives in Chicago with his spouse, Mitchel, and their dog, Jameson. He spent several years in Ireland as a child and still holds citizenship there and in the United States. Patrick enjoys travel for work and pleasure and has a knack for “always getting it right.”


Bar Admissions


Court Admissions

U.S. Supreme Court
U.S. Court of Appeals for the Tenth Circuit
U.S. Court of Appeals for the Sixth Circuit
U.S. Court of Appeals for the Seventh Circuit
U.S. Court of Appeals for the Eighth Circuit
U.S. Court of Appeals for the Ninth Circuit
U.S. Court of Appeals for the Federal Circuit
U.S. District Court for the Central District of Illinois
U.S. District Court for the Eastern District of Texas
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 Southern District of Illinois
U.S. District Court for the Western District of Michigan
U.S. District Court for the Western District of Wisconsin


Northwestern University
J.D. (1993)

Boston College
B.A. magna cum laude, Dean’s Scholar in economics (1990)

Insights & Events

Other Perspectives
  • Competition Laws Outside the United States (2d ed.), Editor (2018−present), American Bar Association

Leadership & Community

Pro Bono

Patrick has assisted numerous clients over the years on a pro bono basis, particularly in civil rights cases where he was appointed by the court.

Professional Associations

  • American Bar Association, Antitrust Section, Chair’s Assistant (2001-02); Computer Industry & Internet Committee, Vice Chair (2002-05); Business Torts and Civil RICO Committee, Vice Chair (2005-08); Antitrust/Consumer Protection Daily Digest, Chair (2008-18)
  • Chicago Bar Association


  • IAM 1000 — Leading Patent Litigator, 2013−present
  • Managing Intellectual Property "IP Star," 2018-20

Awards Methodology

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