Margaret (Peg) M. Duncan focuses her practice on IP litigation, including patent, trademark and copyright litigation. Peg also focuses her practice on protection of intellectual property, including prosecution, counseling and transactions relating to global patent and trademark portfolios. Peg has represented numerous clients in federal courts and at the US Patent and Trademark Office in a wide variety of technologies and industries, including life sciences, chemical and computer hardware and software technologies, financial services, and food and beverage products.
From 2002 to 2014, Peg served as McDermott’s Chicago IP Practice Group Leader. Prior to joining McDermott in 1992, Peg also served as senior IP counsel for two fortune 100 companies.
Peg currently serves as president of the Richard Linn American Inn of Court and serves on the International Trademark Association (INTA) International/US Amicus Committee. Peg also serves as vice chair of the Amicus Committee of the Intellectual Property Law Association of Chicago (IPLAC), for which she co-authored amicus briefs to the US Supreme Court in Alice Corporation v. CLS Bank International and SCA Hygiene v. First Quality Baby Products. She has been consistently recognized by Chambers USA, Best Lawyers, The Legal 500, IAM 1000, World Trademark Review and Illinois Super Lawyers.
Peg received her JD from Loyola University of Chicago School of Law, a BS in natural sciences from Xavier University and a BS in medical technology from Indiana University. Peg also served as a judicial extern for Chief Judge James B. Parsons in the US District Court for the Northern District of Illinois.
Won a jury verdict of non-infringement and invalidity of three patents for a defendant in the District of Delaware relating to reinforced thermoplastics used in the auto industry
Won summary judgment of design patent invalidity for a defendant in the Northern District of Illinois regarding home construction products
Won summary judgment of non-infringement and invalidity of a trademark in a declaratory judgment action in the Eastern District of New York regarding a multimillion dollar ad campaign slogan
Won summary judgment of non-infringement and $2.5 million in attorneys’ fees in a trademark case in the Northern District of Illinois
Successfully resolved numerous patent infringement actions for defendants in the Eastern District of Texas regarding transactions in the financial services industry, including credit card, reward card and gift card transactions, online banking transactions and data security and encryption used in online financial transactions
Successfully resolved a copyright infringement action for defendants after mediation in the Northern District of Illinois regarding web-based video games
Successfully resolved a trademark infringement action for a defendant after mediation in the Northern District of Illinois regarding information technology (IT) security software products
Successfully resolved a design patent infringement action for a defendant after mediation for a defendant in the District of Delaware regarding home construction products
Supreme Court of the United States
US Court of Appeals for the Federal Circuit
US Court of Appeals for the Seventh Circuit
US District Court for the Northern District of Illinois (trial bar)
US District Court for the Central District of Illinois
US District Court for the Eastern District of Texas
US District Court for the Western District of Wisconsin
Illinois Supreme Court
US Patent and Trademark Office
Do not send any information or documents that you want to have treated as secret or confidential. Providing information to McDermott via email links on this website or other introductory email communications will not create an attorney-client relationship; will not preclude McDermott from representing any other person or firm in any matter; and will not obligate McDermott to keep confidential the information you provide. McDermott cannot enter into an attorney-client relationship with you until McDermott has determined that doing so will not create a conflict of interest and until you and McDermott have entered into a written agreement or engagement letter that sets forth the terms of our relationship.