Elizabeth S. "Liz" Day

Elizabeth S. "Liz" Day is a highly experienced patent litigation trial lawyer with a career spanning nearly three decades. She is currently a partner at Bunsow De Mory LLP, where she focuses on complex intellectual property and patent disputes in federal district courts and before the International Trade Commission (ITC).

Ms. Day's practice encompasses a broad range of high-technology areas, including semiconductor packaging, Wi-Fi and cellular communications, smartphones, flash memory, computer security, computer networking, data compression, interactive television, and content delivery systems. She has served as lead counsel for both plaintiffs and defendants in numerous matters, demonstrating a balanced approach to patent litigation, though she has expressed an interest in pursuing more plaintiff-side work in recent years.

Her prior firm history includes co-founding the IP litigation boutique Kramer Day Alberti Lim Tonkovich & Belloli LLP in 2011, from which she moved to Bunsow De Mory in February 2023. Before co-founding Kramer Day, she was a partner in the IP litigation group of a prominent international law firm. For the case INVT SPE LLC v. AT&T Inc. et al., which involved patents related to 3G and LTE wireless communications standards, Ms. Day appeared as of counsel for the plaintiff, Kramer Levin Naftalis & Frankel.

Ms. Day has secured notable outcomes for her clients, including a $172.5 million verdict in Wapp Tech Limited Partnership v. Seattle Spinco, Inc., et al., a case involving mobile application development technology that subsequently settled favorably. She also achieved favorable settlements on the eve of trial in cases such as Garrity Power Services v. Samsung, concerning two-way wireless charging, and Polaris PowerLED Technologies, LLC v. Samsung Electronics Ltd., involving automatic brightness control technology in mobile phones and televisions. In Dell Technologies Inc. v. VideoLabs, Inc., she successfully defeated IPR petitions at the institution stage before reaching a favorable settlement. She has also represented complainants, including Rovi Corporation, in ITC investigations involving interactive program guide and parental control technology.

Ms. Day earned her Juris Doctor and an MBA from the University of California, Davis, and a Bachelor of Arts, cum laude, from Dartmouth College. She is admitted to the State Bar of California and the U.S. Court of Appeals for the Federal Circuit, among other federal courts.