Elizabeth Day

Elizabeth Day is an experienced and strategically sophisticated trial lawyer and trusted advisor for clients with valuable intellectual property assets. She has litigated more than 300 patent cases in her 30-year career involving a variety of technologies, including semiconductor packaging, Wi-Fi and cellular communications, smartphones, flash memory, computer security, computer networking, data compression, interactive television and content delivery, among others.

Elizabeth has tried over a dozen cases to juries, either as first or second chair. She typically takes responsibility for handling the damages aspects of the cases on which she works. Elizabeth expertise in handling the patent damages has led to significant experience in valuing and monetizing intellectual property, including portfolio diligence and strategy.

In 2025, Elizabeth was listed in the Chambers USA Guide for excellence in patent litigation.

Updated Oct 2025

• TOT Power Control, S.L. v. Apple, Samsung, LG (D. Del.): Represents patent owner in infringement litigation against mobile phone manufacturers. The patents claim important technological improvements to 3G technology that enable significant power savings, greatly increasing a mobile phone’s available bandwidth for data. Played significant role at trial, where patent owner achieved a sweeping victory against Apple in a June 2025 trial. The jury returned a verdict for $110,738,008 in damages for TOT and rejected Apple’s patent invalidity defense. The $110 million patent infringement verdict is the largest in the District of Delaware in 2025, and the third largest in the country.
  
  
• Secure Wi-Fi LLC v. Samsung Electronics Co. Ltd. (E.D. Tex, PTAB): Represents patent owner Secure Wi-Fi in patent infringement litigation against Samsung. The asserted patents claim improvements to securing wireless connections, enhancing user privacy, and mitigating against security risks. Successfully persuaded the Patent Trial & Appeal Board to deny Samsung’s inter partes review petitions. Also defeated Samsung’s motion to stay the federal court case while its IPRs were pending. Co-lead trial counsel in Secure Wi-Fi’s jury trial against Samsung in December 2025.
  
  
• Metarail, Inc. v. Google LLC (N.D. Cal., PTAB): Represents patent owner Metarail in patent infringement litigation against Google. The four asserted patents claim improvements to deep-link technology, a feature essential to e-commerce websites. Defeated Google’s inter partes review petitions by successfully persuading the Patent Trial & Appeal Board that Google had not demonstrated “a reasonable likelihood that it would prevail in showing the unpatentability of at least one challenged claim” as to the four patents. The case will now proceed to discovery and claim construction.
  
  
• VideoLabs vs. TCL Technology, Hisense (E.D. Tex.): Represents patent owner VideoLabs in patent infringement litigation against TCL and Hisense. The asserted patents (seven against TCL, nine against Hisense) claim improvements to conditional access and digital rights management and H.264 video coding technology.

• Intellectual property

• Technology and telecommunications

• B.A. Government - Dartmouth College - 1991
• J.D. - University of California at Davis School of Law - 1994
• M.B.A. - University of California at Davis Graduate School of Management - 1994

• Women of Litigation Finance    

• California - 1995